JP5477650B2 - Electric wire with terminal bracket - Google Patents

Description

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

  In recent years, in order to reduce the weight of automobiles, the use of aluminum core wires in place of conventional copper alloy core wires has been increasing. On the other hand, terminal fittings made of copper alloy are often used as terminal fittings to be crimped to the core wires of electric wires because of problems such as strength.

  And when the core wire of the electric wire and the terminal fitting are made of different metals, if water is present in the connection part between them, both metals will dissolve as ions in the water, and corrosion will proceed due to electrochemical reaction. Eating is known to occur.

  Thus, it is known that the core wire is covered with a metal cap made of the same metal material as the terminal fitting, and the terminal fitting is crimped to the outside of the metal cap (for example, Patent Document 1). By adopting such a configuration, it is possible to prevent moisture from intervening in the connecting portion between the core wire of the electric wire and the metal cap, and to prevent the occurrence of electrolytic corrosion.

JP 2007-31369 A

  By the way, since the metal which comprises a core wire tends to form an insulating metal oxide layer on the surface of a core wire, the contact resistance of the connection part of a core wire and a terminal metal fitting may become large. In particular, a core wire made of aluminum or the like has a problem that a very hard aluminum oxide film is easily formed to increase the contact resistance with the terminal fitting.

  Therefore, in order to reduce the contact resistance between the core wire and the terminal fitting, it is known to provide a groove in the electric wire connecting portion for caulking the core wire of the electric wire in the terminal fitting. This groove rubs against the metal oxide layer when caulking the electric wire connection portion, cracks the metal oxide layer, and exposes the new metal surface of the core wire, so that the electric wire connection portion contacts the new metal surface.

  However, when a metal cap is coated on the core wire, cracks are less likely to enter the metal oxide layer on the surface of the core wire than when the wire connection portion is directly caulked against the core wire, and There is a problem that it is difficult to reduce the contact resistance by sufficiently contacting the metal and the terminal metal fitting.

  The present invention has been completed based on the above circumstances, and provides an electric wire with terminal fittings that can prevent the occurrence of electrolytic corrosion and can sufficiently reduce contact resistance. Objective.

  The electric wire with a terminal metal fitting of the present invention is an electric wire with a terminal metal fitting in which a terminal metal fitting formed of a metal different from the core wire is connected to a terminal portion of an electric wire formed by coating a metal core wire with an insulating layer. The insulating material is removed from the end of the core wire exposed by removing the insulating layer at a terminal portion of the electric wire by a material that does not cause electrolytic corrosion between the terminal metal fitting and the metal terminal fitting of the same type. A cap formed in a shape covering the end of the layer, and a metal intermediate disposed between the cap and the exposed core wire, and a plurality of recesses formed side by side on the surface in contact with the core wire And a wire connecting portion of the terminal fitting is caulked so as to surround the cap, and the intermediate member is crimped to the core wire.

  According to such a structure, since moisture does not enter between the intermediate member and the core wire, the occurrence of electrolytic corrosion can be prevented. In addition, the edge of the recess formed in the intermediate member is rubbed against the metal oxide layer of the core wire when caulking the wire connection portion of the terminal fitting, and the metal oxide layer is cracked to expose the new metal surface, An intermediate member is pressure-bonded to the new metal surface. That is, according to the configuration of the present invention, the occurrence of electrolytic corrosion can be prevented and the contact resistance can be sufficiently reduced.

In addition, the mouth of the recess is formed in a square shape having substantially the same shape and the same size, and the plurality of recesses have an interval between adjacent recesses between the adjacent recesses of the mouth of the recess. It is good also as what is arrange | positioned in the position smaller than the length dimension of the edge arrange | positioned facing each other.
Here, when the concave portion has a simple groove shape as in the prior art, only the pair of edges along the extending direction rub against the metal oxide layer, whereas the configuration of the present invention. According to the above, the length of the edge that rubs against the metal oxide layer is larger than that. Accordingly, since the area of the exposed new metal surface is increased as compared with the conventional case, the contact between the metal under the metal oxide layer of the core wire and the terminal fitting is sufficient, and the contact resistance can be sufficiently reduced.

Further, the intermediate member is located at a position between the concave portions adjacent to each other in the cross direction with respect to the axial direction of the core wire, and at a position shifted from the position in the axial direction of the core wire in the cross direction. The plurality of recesses may be formed in a positional relationship where the recesses different from the adjacent recesses are arranged.
According to such a configuration, since a flat surface (a surface on which no lip is formed) extending along the axial direction of the core wire is not formed on the surface of the intermediate member that contacts the core wire, the core wire can be prevented from coming out. Can do.

The mouth of the recess has a parallelogram shape, and the plurality of recesses are a pair of opposing edges of the mouth of the one recess, and the other adjacent to the one recess. A pair of opposing edges of the mouth edges of the recesses may be formed in a linear positional relationship.
According to such a configuration, since the portion excluding the concave portion (the portion protruding with respect to the concave portion) of the intermediate member is linear, a plurality of linear grooves may be formed in the mold. Therefore, compared with the case where the unevenness of the mold must be irregularly formed, the cost for mold production can be reduced.

  Further, a sealing member may be provided that covers an end portion of the cap on the insulating layer side and an outer peripheral surface of the insulating layer and seals between the cap and the insulating layer. Thereby, the sealing performance between a cap and an insulating layer can be improved more.

  Further, the electric wire connecting portion has a wire barrel for caulking the core wire of the electric wire and an insulation barrel for caulking the insulating layer, and an end portion of the cap on the insulating layer side is the insulation. It is good also as what is located inside a barrel. According to such a configuration, since the end portion of the cap is caulked by the insulation barrel, the sealing performance in the cap can be further improved.

  Moreover, while the said electric wire is an aluminum electric wire provided with the core wire made from aluminum or aluminum alloy, the said terminal metal fitting is good also as a thing made from copper alloy.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of electrolytic corrosion can be prevented and the electric wire with a terminal metal fitting which can make contact resistance small enough can be provided.

It is an electric wire with a terminal metal fitting concerning this embodiment, Comprising: The perspective view which shows the state before connecting a terminal metal fitting to the terminal part of an electric wire The perspective view which is a structure of the terminal part of an electric wire, Comprising: A state before mounting | wearing with a heat contraction tube, an intermediate member, and a cap A plan view showing the intermediate member before it is bent The perspective view which is an intermediate member and shows the state after bending The perspective view which is the structure of the terminal part of an electric wire, Comprising: A state after mounting | wearing with a heat contraction tube, an intermediate member, and a cap Side view of electric wire with terminal bracket Sectional drawing which is a wire with a terminal metal fitting and shows the structure concerning the connection between the terminal part of the electric wire and the terminal metal fitting

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment embodying the present invention will be described in detail with reference to FIGS.
In the electric wire 10 with terminal metal fittings in the present embodiment, a terminal metal fitting 14 formed of a metal different from the core wire 11 is connected to a terminal portion of an electric wire 13 formed by coating a metal core wire 11 with an insulating layer 12. It will be. In the present embodiment, the case where the electric wire 13 is an aluminum electric wire provided with a core wire 11 made of aluminum or aluminum alloy while the terminal fitting 14 is made of copper alloy will be described.

  As shown in FIG. 2, the electric wire 13 is obtained by coating a core wire 11 formed by twisting a plurality of thin aluminum wires with a resin insulating layer 12, and the insulating layer 12 is peeled off at the terminal portion. As a result, the core wire 11 is exposed.

The terminal fitting 14 is formed by pressing a copper alloy plate, and has an elongated shape in the front-rear direction as a whole (see FIG. 1).
The front end portion of the terminal fitting 14 is a main body portion 15 having a substantially rectangular tube shape that is connected to a mating terminal fitting 14 (not shown).

  A portion of the terminal fitting 14 on the rear side of the main body 15 is an electric wire connecting portion 16 that is caulked to the electric wire 13. The electric wire connection portion 16 includes a wire barrel 16A that is caulked to the core wire 11 of the electric wire 13, and an insulation barrel 16B that is caulked to the insulating layer 12.

  The wire barrel 16A has an open barrel type, that is, a form in which a pair of caulking pieces 18A are raised from the left and right side edges of the bottom plate 17, and the insulation barrel 16B is also an open barrel type like the wire barrel 16A. A pair of caulking pieces 18B are raised from the left and right side edges. The caulking piece 18A of the wire barrel 16A has a smaller rising dimension from the bottom plate 17 than the caulking piece 18B of the insulation barrel 16B, and has a width dimension (length in the front-rear direction) that is larger than the caulking piece 18B of the insulation barrel 16B. It is supposed to be big. The caulking pieces 18A of the wire barrel 16A and the caulking pieces 18B of the insulation barrel 16B have substantially the same height dimension and the same width dimension as the facing caulking pieces 18A and 18B, respectively. A plurality of serrations 25 are formed on the inner surface of the wire barrel 16A.

  A cap 19 made of the same kind of copper alloy as the terminal fitting 14 is put on the terminal portion of the electric wire 13. The cap 19 is formed, for example, by deep drawing a copper alloy plate, and has a cylindrical shape with one side closed. The cap 19 covers the exposed core wire 11 at the end of the electric wire 13 and is caulked to the wire barrel 16A from the outside (see FIG. 6).

  The cap 19 is formed in a cylindrical shape whose cross-sectional shape is substantially the same in the longitudinal direction before the cap 19 is caulked to the wire barrel 16A. The cap 19 has a length dimension capable of covering from the tip of the core wire 11 exposed by removing the insulating layer 12 at the terminal portion of the electric wire 13 to the terminal (tip portion) of the insulating layer 12. (See FIG. 7). In other words, the length dimension of the cap 19 is equal to the length dimension in the front-rear direction of the wire connection portion 16 of the terminal fitting 14, the tip projects forward from the wire barrel 16 </ b> A, and the rear end (open end). Is set to a length dimension located substantially in the center in the front-rear direction of the insulation barrel 16B.

  Between the cap 19 and the core wire 11, an intermediate member 20 made of the same kind of copper alloy as the terminal fitting 14 is disposed. The intermediate member 20 is formed by bending a substantially rectangular metal plate (a metal plate made of a copper alloy and tin-plated) into a substantially cylindrical shape (see FIGS. 3 and 4). The intermediate member 20 is bent so that the short sides thereof are close to each other, and a slight gap is formed between the short sides. In a state before the intermediate member 20 is caulked to the wire barrel 16 </ b> A, the inner diameter dimension is larger than the outer diameter dimension of the core wire 11, and the outer diameter dimension is smaller than the inner diameter dimension of the cap 19 ( (See FIG. 2). The cross-sectional shape of the intermediate member 20 is substantially constant over the entire length in the axial direction, and both ends thereof are open.

  A plurality of recesses 21 are formed side by side on the plate surface of the intermediate member 20. The plurality of concave portions 21 are surfaces on the side of the intermediate member 20 that are in contact with the core wire 11 (hereinafter referred to as contact surfaces 22), that is, surfaces on the inner side in a state of being wound in a substantially cylindrical shape. Is formed. The plurality of recesses 21 constitute serrations that bite into the core wire 11 as the intermediate member 20 is crimped to the core wire 11.

Next, the shape of the plurality of recesses 21 in plan view before the intermediate member 20 is bent will be described.
As shown in FIG. 3, each recess 21 is formed such that its mouth edge 23 has a parallelogram shape having substantially the same shape and the same size. The depth dimension (recess dimension) of each recess 21 is substantially the same for all recesses 21.

  The mouth edge 23 of each recess 21 extends in a direction along the long side direction of the intermediate member 20 and is opposed to a pair of edges (referred to as a first edge 23 </ b> A), and is oblique to the long side direction of the intermediate member 20. And a pair of edges (referred to as second edges 23B) facing each other. The first edge 23A and the second edge 23B have substantially the same length dimension.

  The plurality of recesses 21 are arranged in a line in a direction substantially orthogonal to the axial direction of the core wire 11 (the direction along the long side direction of the intermediate member 20, the vertical direction in FIG. 3), and this row is the axial direction of the core wire 11. A plurality of rows (seven rows in this embodiment) are formed side by side (in the left-right direction in FIG. 3). Then, the columns of the recesses 21 (hereinafter referred to as “rows”) arranged in a line in the vertical direction in FIG. 3 are arranged in order from the left side of FIG. 3 in the first row, the second row, the third row, the fourth row. The row, the fifth row, the sixth row, and the seventh row will be described. The first row and the second row of recesses 21, the second row and the third row of recesses 21, the third row and the fourth row The recesses 21, the fourth row and fifth row recesses 21, the fifth row and sixth row recesses 21, the sixth row and seventh row recesses 21 are respectively in the direction along the long side direction of the intermediate member 20. They are offset. The amount of misalignment of the recesses 21 is constant between all the rows, and the recesses 21 in one row and the recesses 21 in the other rows adjacent thereto are arranged in an oblique direction with respect to the axial direction (hereinafter, , Referred to as vertical diagonal rows). The arrangement direction of the vertical rows coincides with the extending direction of the second edge 23 </ b> B of each recess 21. In each row, next to a position between the adjacent recesses 21 (a position between the recesses 21 adjacent in the crossing direction with respect to the axial direction of the core wire 11) (a position shifted in the axial direction of the core wire 11), The row of recesses 21 (a recess 21 different from the recesses 21 adjacent in the crossing direction) is located.

  The plurality of recesses 21 are arranged at positions where the interval between the adjacent recesses 21 is smaller than the length dimension of the edges of the mouth edges 23 that are arranged facing each other between the adjacent recesses 21. Specifically, the interval between the recesses 21 adjacent in the row is smaller than the length dimension of the second edge 23B, and the interval between the recesses 21 adjacent in the vertical row is the length of the first edge 23A. It is arranged at a position smaller than the size.

  The first edge 23 </ b> A of the recess 21 is aligned on a straight line along the long side direction of the intermediate member 20, and the second edge 23 </ b> B is aligned on a straight line in an oblique direction with respect to the axial direction of the core wire 11. The distance between the first edge 23A and the first edge 23A and the distance between the second edge 23B and the second edge 23B in the adjacent recesses 21 are substantially equal and constant. In addition, the first edge 23A of the one row of recesses 21 and the first edge 23A of the other row of recesses 21 are arranged substantially in parallel, and the second edge 23B of the one row of diagonal recesses 21 The second edge 23B of the recesses 21 in the other vertical slant rows is arranged substantially in parallel.

  A heat shrink tube 24 (seal member) is provided on the outer peripheral side of the cap 19. The heat-shrinkable tube 24 has a cylindrical shape larger in diameter than the cap 19 in a state before contraction (see FIG. 2), and is loosely fitted to the cap 19. The heat-shrinkable tube 24 has a length dimension that covers from the rear end portion of the cap 19 to a portion of the insulating layer 12 positioned behind the cap 19 (see FIG. 5). The heat-shrinkable tube 24 is in close contact with the outer periphery of the insulating layer 12 from the opening end of the cap 19 and seals between the cap 19 and the insulating layer 12.

Next, the manufacturing method of the electric wire 10 with a terminal metal fitting concerning this embodiment is demonstrated.
First, the intermediate member 20 is externally fitted to the core wire 11 of the electric wire 13. Next, the cap 19 is put on the outside of the intermediate member 20, and the core wire 11 and the insulating layer 12 are set so as to cover up to the end portions.

  Then, the heat shrinkable tube 24 is attached so as to cover the range from the rear end (opening end) of the cap 19 to the insulating layer 12, and heated by heating means such as a dryer. Then, the heat-shrinkable tube 24 contracts and closely contacts the entire outer peripheral surface of the insulating layer 12 positioned behind the cap 19 from the rear end portion of the cap 19 (see FIG. 5).

  Next, the terminal portion of the electric wire 13 covered with the cap 19 and the heat shrinkable tube 24 is placed on the bottom plate 17 of the terminal fitting 14 (see FIG. 7). At this time, the axial position of the heat-shrinkable tube 24 is set to the approximate center in the axial direction, in other words, the position of the opening end of the cap 19 is set to the approximate center of the insulation barrel 16B in the front-rear direction. Further, the position where the tip of the cap 19 protrudes forward from the wire barrel 16A, in other words, the entire intermediate member 20 disposed inside the cap 19 is set so as to be located inside the wire barrel 16A.

  Then, the crimping piece 18B of the insulation barrel 16B is crimped and fixed by crimping so as to surround the heat shrinkable tube 24, and the crimping piece 18A of the wire barrel 16A is crimped and fixed so as to surround the cap 19. At the time of caulking, the outer ends of the cap 19 and the heat-shrinkable tube 24 are held from both the left and right sides while overlapping the protruding ends of the caulking pieces 18A and 18B, respectively, and are caulked in a so-called overlap type.

  As a result, the open end of the caulked cap 19 is in close contact with the insulating layer 12, and the entire intermediate member 20 disposed inside the cap 19 is crimped to the core wire 11. At this time, the metal oxide layer of the core wire 11 and the lip 23 of the intermediate member 20 come into contact with each other and rub against each other, and the metal oxide layer is cracked to expose the new metal surface of the core wire 11. Then, the contact surface 22 of the intermediate member 20 comes into contact with the newly formed metal surface of the core wire 11.

  In this way, the core wire 11 of the electric wire 13 and the terminal fitting 14 are electrically connected via the intermediate member 20 and the cap 19, thereby completing the connection between the electric wire 13 and the terminal fitting 14.

  In the connected state, the cap 19 is completely sealed by covering the opening end of the cap 19 with the heat-shrinkable tube 24 and crimping the cap 19 so as to be in close contact with the insulating layer 12. Therefore, even if the core wire 11 of the electric wire 13 and the intermediate member 20 and the cap 19 are dissimilar metals, it is possible to prevent moisture from entering and causing electrolytic corrosion. In addition, the cap 19 and the terminal fitting 14 are in a state where the connection portion is exposed, but since both are formed of the same kind of metal, even if they are exposed to moisture, no electrolytic corrosion occurs.

According to the present embodiment configured as described above, the following effects can be obtained.
In the electric wire 10 with terminal metal fittings of the present embodiment, a terminal metal fitting 14 formed of a metal different from the core wire 11 is connected to a terminal portion of an electric wire 13 formed by coating a metal core wire 11 with an insulating layer 12. An electric wire 10 with a terminal fitting, which is covered with a metal material similar to the terminal fitting 14 from the exposed end of the core wire 11 to the end of the insulating layer 12 by removing the insulating layer 12 at the terminal portion of the electric wire 13. The cap 19 formed in a shape, and a metal made by arranging a plurality of recesses 21 side by side on the surface (contact surface 22) on the side in contact with the core wire 11 is disposed between the cap 19 and the exposed core wire 11. The rim 23 of the concave portion 21 is formed in a parallelogram shape having substantially the same shape and the same size, and the plurality of the concave portions 21 have an interval between the adjacent concave portions 21 of the lip 23. Out adjacent recess 2 The wire connection portion 16 of the terminal fitting 14 is caulked so as to surround the cap 19, and the intermediate member 20 is disposed in the core wire 11. Crimped to.

Thereby, since moisture does not enter between the intermediate member 20 and the core wire 11 which are joint portions of different kinds of metals, it is possible to prevent the occurrence of electrolytic corrosion. Further, the edge 23 of the recess 21 formed in the intermediate member 20 rubs against the metal oxide layer of the core wire 11 when the wire connection portion 16 of the terminal fitting 14 is caulked, and the metal oxide layer is cracked. The new metal surface is exposed, and the intermediate member 20 is pressure-bonded to the new metal surface. Here, when the concave portion has a groove shape as in the prior art, it is only a pair of edges along the extending direction that rubs against the metal oxide layer. The length of the edge that rubs against the oxide layer is larger. For example, when this embodiment is compared with a groove-like serration that extends linearly in a direction intersecting with the axial direction, the row of recesses 21 of this embodiment is more than the length dimension obtained by adding both side edges of the groove-like serration. Therefore, the length dimension of the edge that rubs against the metal oxide layer is larger than the conventional one. Therefore, since the area of the new metal surface in contact with the intermediate member 20 is larger than before, the contact between the metal under the metal oxide layer of the core wire 11 and the terminal fitting 14 is sufficient, and the contact resistance is sufficiently reduced. Can do.
That is, according to this embodiment, the occurrence of electrolytic corrosion can be prevented and the contact resistance can be sufficiently reduced.

  Further, the intermediate member 20 is adjacent to the intermediate member 20 in the crossing direction at a position between the recesses 21 adjacent to each other in the crossing direction with respect to the axial direction of the core wire 11. A plurality of recesses 21 are formed in a positional relationship in which a recess 21 different from the matching recess 21 is disposed. Here, for example, when arranging a plurality of concave portions in a line in the axial direction of the core wire 11 and arranging a plurality of the rows in a direction intersecting the axial direction, the intermediate member has an axis line between the rows of the concave portions. A flat surface is formed along the direction. However, in the present embodiment, since such a flat surface (a surface on which the lip 23 is not formed) is not formed on the contact surface 22 of the intermediate member 20, the force that prevents the core wire 11 from being pulled out increases, and the core wire 11 is pulled out. Can be prevented.

  In addition, the mouth edge 23 of the recess 21 has a parallelogram shape, and a pair of opposing edges (first edge 23A, second edge 23B) among the mouth edges 23 of one adjacent recess 21; A pair of facing edges (first edge 23A, second edge 23B) among the mouth edges 23 of the other recesses 21 are formed in a linear positional relationship. Here, the mold for forming the recess 21 in the intermediate member 20 needs to be formed in a shape in which a portion corresponding to the recess 21 protrudes and the other portions are recessed. In this embodiment, since the part except the recessed part 21 of the intermediate member 20 makes a linear shape, what is necessary is just to form in a metal mold | die by making several linear groove | channels cross | intersect. Therefore, compared with the case where the unevenness | corrugation of a metal mold | die must be formed irregularly, the cost concerning metal mold production can be made cheap.

  Further, a heat shrinkable tube 24 that covers the rear end portion (end portion on the insulating layer 12 side) of the cap 19 and the outer peripheral surface of the insulating layer 12 and seals between the cap 19 and the insulating layer 12 is provided. . Thereby, the sealing performance between the cap 19 and the insulating layer 12 can be improved.

  The electric wire connecting portion 16 includes a wire barrel 16A for caulking the core wire 11 of the electric wire 13 and an insulation barrel 16B for caulking the insulating layer 12, and a rear end portion of the cap 19 (on the insulating layer 12 side). End) is located inside the insulation barrel 16B. Thereby, since the opening edge part of the cap 19 is crimped by the insulation barrel 16B, the sealing performance in the cap 19 can be improved more.

<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, the rim 23 of the recess 21 formed in the intermediate member 20 is formed in a parallelogram shape, but is not limited thereto, and is, for example, a square, a rectangle, a trapezoid, or the like. Also good.
(2) In the above embodiment, the heat shrinkable tube 24 that covers the rear end portion (end portion on the insulating layer 12 side) of the cap 19 and the outer peripheral surface of the insulating layer 12 is provided. Instead, for example, the tape may be wound around a range extending from the rear end of the cap 19 to the outer peripheral surface of the insulating layer 12.

(3) In the above embodiment, the wire connecting portion 16 is an open barrel type that is caulked to a so-called overlap type, but is not limited to this, and is a closed barrel type that is formed in a cylindrical shape before caulking. There may be.
(4) In the above embodiment, the female terminal fitting 14 is exemplified as the terminal fitting 14 connected to the terminal of the electric wire 13, but for example, a male terminal fitting provided with a male tab or an eyeball-shaped connecting portion is provided. Other terminal fittings such as an LA terminal may be used.

  (5) The present invention is not limited to the case where the copper metal terminal fitting 14 is connected to the aluminum electric wire 13 illustrated in the above embodiment, and the core wire of the electric wire and the terminal fitting connected thereto are formed of different metals. It is possible to apply widely to the case where it is.

DESCRIPTION OF SYMBOLS 10 ... Electric wire with terminal metal fitting 11 ... Core wire 12 ... Insulating layer 13 ... Electric wire 14 ... Terminal metal fitting 16 ... Electric wire connection part 16A ... Wire barrel 16B ... Insulation barrel 19 ... Cap 20 ... Intermediate member 21 ... Recessed part 22 ... Contact surface (core wire) Surface on the side in contact with
23 ... Mouth edge 23A ... First edge (a pair of opposite edges)
23B ... Second edge (a pair of opposite edges)
24 ... Heat shrinkable tube (seal member)

Claims (7)

A terminal fitting electric wire in which a terminal fitting formed of a metal different from the core wire is connected to a terminal portion of an electric wire formed by coating an insulating layer on a metallic core wire,
The terminal of the insulating layer from the end of the core wire exposed by removing the insulating layer at the terminal portion of the electric wire by a material that does not cause electrolytic corrosion between the terminal metal and the terminal metal of the same type. A cap formed in a shape that covers up to,
A metal intermediate member that is disposed between the cap and the exposed core wire, and has a plurality of recesses formed side by side on the surface in contact with the core wire;
The electric wire connecting portion of the terminal fitting is an electric wire with a terminal fitting that is caulked so as to surround the cap, and the intermediate member is crimped to the core wire. The lip of the recess is formed in a square shape having substantially the same shape and the same size,
The plurality of recesses are arranged at positions where an interval between the adjacent recesses is smaller than a length dimension of an edge arranged facing each other between the adjacent recesses in a mouth edge of the recess. The electric wire with a terminal metal fitting of 1.   The intermediate member is positioned between the recesses adjacent to each other in the cross direction with respect to the axial direction of the core wire, and is adjacent to the cross direction in a position shifted from the position in the axial direction of the core wire. The electric wire with terminal fitting according to claim 1 or 2, wherein the plurality of recesses are formed in a positional relationship where the recesses different from the recesses are arranged. The mouth of the concave portion has a parallelogram shape,
In the plurality of recesses, a pair of opposing edges among the mouth edges of the one recess and a pair of opposing edges among the mouth edges of the other recesses adjacent to the one recess are respectively linear. The electric wire with a terminal metal fitting according to any one of claims 1 to 3, wherein the electric wire is formed in a positional relationship of   The sealing member which covers the edge part by the side of the said insulating layer of the said cap, and the outer peripheral surface of the said insulating layer, and seals between the said cap and the said insulating layer is provided. The electric wire with a terminal metal fitting as described in one. The electric wire connecting portion has a wire barrel for caulking the core wire of the electric wire, and an insulation barrel for caulking the insulating layer,
The electric wire with a terminal fitting according to any one of claims 1 to 5, wherein an end portion of the cap on the insulating layer side is located inside the insulation barrel.   The electric wire with terminal fitting according to any one of claims 1 to 6, wherein the electric wire is an aluminum electric wire having a core wire made of aluminum or aluminum alloy, and the terminal fitting is made of copper alloy.

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