JP2012138377A - Terminal fitting, and electric wire with terminal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal fitting with reduced electric resistance against an electric wire, and an electric wire with a terminal fitting.SOLUTION: A plurality of recesses 18 are formed on a face of a wire barrel 16, on which a core wire 13 is arranged, and a hole edge of the recess 18 comprises a pair of first hole edges 19 in parallel to each other. The plural recesses 18 are aligned at intervals along a direction, in which the first hole edge 19 extends, and aligned at intervals along a direction, in which an electric wire 11 extends. The interval between the adjacent recesses 18 in a direction, in which the first hole edge 19 extends, is set narrower than the interval between the adjacent recesses 18 in a direction, in which the electric wire 11 extends.

Description

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

  Conventionally, as a terminal fitting connected to the terminal of an electric wire, the thing of patent documents 1 is known, for example. The terminal fitting is formed by pressing a metal plate material and includes a crimping portion that is crimped from the outside to a core wire exposed from the end of the electric wire.

  When an oxide film is formed on the surface of the core wire described above, there is a concern that the electrical resistance between the core wire and the crimping portion increases due to the oxide film interposed between the core wire and the crimping portion.

  Therefore, in the prior art, a recess (serration) extending continuously in a direction intersecting with the direction in which the electric wire extends is formed on the inner side (core wire side) of the crimping portion. A plurality of the recesses are formed side by side in the direction in which the electric wire extends. The recess is formed by press-molding a metal plate with a mold.

  When the crimping portion is crimped to the core wire of the electric wire, the core wire is pressed by the crimping portion and plastically deformed in the direction in which the electric wire extends. Then, the oxide film formed on the surface of the core wire is peeled off by coming into sliding contact with the hole edge of the recess. Then, the new surface of the core wire comes into contact with the crimping portion. Thereby, the electrical resistance between an electric wire and a terminal metal fitting can be made small.

JP-A-10-125362

  In recent years, the use of aluminum or an aluminum alloy as a core wire material has been studied. An oxide film is relatively easily formed on the surface of the aluminum or aluminum alloy. For this reason, for example, when aluminum or an aluminum alloy is used for the core wire of an electric wire, even when a recess is formed, the electrical resistance between the core wire and the crimping portion may not be sufficiently reduced.

  Therefore, it is conceivable to arrange the plurality of concave portions side by side in the direction in which the electric wires extend and also in the direction intersecting with the direction in which the electric wires extend. As a result, the area of the hole edge of the recesses is increased compared to the case where the recesses are simply arranged in the direction in which the electric wires extend, so that it was expected that the oxide film formed on the core wire could be reliably peeled off.

  However, according to the above configuration, there is a concern that the manufacturing cost of the mold for forming the concave portion will increase for the following reasons. That is, a convex part is formed in the mold at a position corresponding to the concave part of the crimping part. This convex portion is formed by cutting out a metal member. At this time, depending on the arrangement of the plurality of recesses, the metal member may have to be cut out by electric discharge machining. This increases the manufacturing cost of the mold.

  The present invention has been completed based on the above circumstances, and provides a terminal fitting and an electric wire with terminal fitting with reduced electrical resistance to the electric wire and reduced die manufacturing cost. Objective.

  The present invention is a terminal fitting provided with a crimping portion that is crimped so as to be wound around the core wire exposed from an electric wire including a core wire made of aluminum or an aluminum alloy, and before the crimping portion is crimped to the core wire. In the state, a plurality of recesses are formed on the surface of the crimping part on the side where the core wire is arranged, and the hole edges of the recesses have a parallelogram shape, and the hole edges of the recesses are parallel to each other. A pair of first hole edges and a pair of second hole edges parallel to each other different from the first hole edges, and the plurality of recesses are spaced along the direction in which the first hole edges extend. Arranged side by side and arranged side by side along the extending direction of the second hole edge, and the first hole edge is 85 ° to 95 ° with respect to the extending direction of the electric wire. The second hole edge has the following angle. An angle of 25 ° or more and 35 ° or less is formed with respect to the extending direction, and the hole edge of the recess and the bottom surface of the recess are connected by four inclined surfaces, and the pair of first of the inclined surfaces. The pair of first inclined surfaces that connect the edge of the hole and the bottom surface of the concave portion is a surface on the side where the core wire is arranged in the crimping portion and the surface of the portion where the concave portion is not formed. The pair of second inclined surfaces connecting the pair of second hole edges and the bottom surface among the inclined surfaces are formed in the pressure-bonding portion. It is characterized in that it is formed at an angle of 115 ° or more and 140 ° or less with respect to the surface on the side where the core wire is arranged and the portion where no recess is formed.

  Further, the present invention is an electric wire with a terminal fitting comprising: an electric wire having an insulating coating on the outer periphery of a core wire made of aluminum or an aluminum alloy; and a terminal fitting that is crimped to the core wire exposed from the electric wire, The terminal fitting includes a crimping portion that is crimped so as to be wound around the core wire, and in a state before the crimping portion is crimped to the core wire, a surface of the crimping portion on the side where the core wire is disposed A plurality of recesses are formed, the hole edges of the recesses have a parallelogram shape, the hole edges of the recesses are a pair of first hole edges parallel to each other, and the first hole edges different from each other are parallel to each other. And a plurality of the concave portions are arranged side by side along the extending direction of the first hole edge and along the extending direction of the second hole edge. Are arranged side by side at intervals, The one hole edge forms an angle of 85 ° to 95 ° with respect to the extending direction of the electric wire, and the second hole edge forms an angle of 25 ° to 35 ° with respect to the extending direction of the electric wire. The hole edge of the recess and the bottom surface of the recess are connected by four inclined surfaces, and the pair of first holes connecting the pair of first hole edges and the bottom surface of the recess among the inclined surfaces. The inclined surface is formed at an angle of 90 ° or more and 110 ° or less with respect to the surface of the crimping portion on the side where the core wire is disposed and the portion where the concave portion is not formed. And the pair of second inclined surfaces connecting the pair of second hole edges and the bottom surface of the inclined surfaces are surfaces on the side where the core wire is disposed in the crimping portion, and a recess is provided. It is formed at an angle of 115 ° to 140 ° with respect to the surface of the part that is not formed. It is characterized in.

  According to the present invention, the oxide film formed on the surface of the core wire is peeled off by the edge formed at the hole edge of the recess, and the new surface is exposed. Are electrically connected. Thereby, the electrical resistance of an electric wire and a terminal metal fitting is reduced.

  Further, according to the present invention, the mold for forming the concave portion of the crimping portion has a plurality of grooves in the direction along the first hole edge of the concave portion and the second hole edge of the concave portion on the surface of the metal material. It can be manufactured by cutting a plurality of grooves in the direction. Thereby, the manufacturing cost of a metal mold | die can be reduced.

  When the core wire is made of aluminum or an aluminum alloy, an oxide film is relatively easily formed on the surface of the core wire. According to this invention, even if it is a case where a core wire consists of aluminum or an aluminum alloy, the electrical resistance between an electric wire and a terminal metal fitting can be made small.

  Further, according to the present invention, the first hole edge is arranged so as to intersect with the extending direction of the core wire at an angle of 85 ° or more and 95 ° or less. When a force along the extending direction is applied, the movement of the core wire is suppressed by the edge formed at the first hole edge. Thereby, the new surface of the core wire formed by sliding contact with the hole edge of the recess can reliably contact the surface of the crimping portion located in the vicinity of the recess. As a result, the electrical resistance between the electric wire and the terminal fitting can be reliably reduced.

  On the other hand, when the angle formed between the first hole edge and the extending direction of the core wire is less than 85 ° and more than 95 °, when a force along the extending direction of the electric wire is applied to the electric wire, Depending on the edge formed at the first hole edge, there is a concern that the movement of the core wire cannot be sufficiently maintained. Then, there exists a possibility that a core wire may move to the direction away from the surface of a crimping | compression-bonding part. As a result, a portion that does not contribute to electrical connection with the crimping portion is generated on the new surface of the core wire, and as a result, the electrical resistance between the electric wire and the crimping portion may not be sufficiently reduced, which is not preferable.

  In the present invention, the angle formed between the first inclined surface and the surface of the crimped portion on the side where the core wire is disposed and the portion where the concave portion is not formed is It is relatively small, 90 ° to 110 °. For this reason, the edge formed in the 1st hole edge of a recessed part is a comparatively sharp thing. As a result, the oxide film formed on the core wire can be reliably peeled off by the edge formed on the first hole edge. If the angle formed between the first inclined surface and the surface of the crimped portion on the side where the core wire is disposed and the portion where the concave portion is not formed is less than 90 °, the concave portion This is not preferable because the mold is difficult to come off during press molding. In addition, when the angle exceeds 110 °, the oxide film formed on the core wire cannot be sufficiently peeled off, which is not preferable.

  Moreover, according to this invention, since the 2nd hole edge has comprised the angle of 25 degrees or more and 35 degrees or less with respect to the extending direction of an electric wire, the 1st hole edge of the recessed parts adjacent to the extending direction of an electric wire is. The wires are overlapped in the extending direction. Thereby, the holding force of the core wire by the crimping part is further improved. When the angle formed between the second hole edge and the direction in which the electric wire extends is less than 25 °, and when it exceeds 35 °, the first hole edge between the adjacent recesses in the direction in which the electric wire extends is the direction in which the electric wire extends. This is not preferable because a non-overlapping region is formed.

  Moreover, the crimping | compression-bonding part is crimped | bonded so that it may wind from the outer side of a core wire. For this reason, the hole edge of a recessed part deform | transforms in the direction closed about the direction which cross | intersects the extension direction of a core wire.

  For this reason, if the angle formed between the second inclined surface and the bottom surface of the recess is excessively large, the hole edge of the recess closes and closes in the direction intersecting the extending direction of the core wire, and the second hole edge becomes the core wire. There is concern that it will not be able to slide.

  In view of the above points, the angle formed between the second inclined surface and the surface of the crimped portion on the side where the core wire is disposed and the portion where the recess is not formed is 115 °. It is preferable to set the angle to 140 ° or less. Thereby, even when the crimping | compression-bonding part is crimped | bonded to a core wire, it can suppress that the hole edge of a recessed part closes and closes in the direction which cross | intersects the extension direction of a core wire. As a result, the oxide film of the core wire can be peeled off when the second hole edge is in sliding contact with the core wire.

As embodiments of the present invention, the following embodiments are preferable.
The 1st pitch space | interval with respect to the extension direction of the said core wire of the said some recessed part formed in the said crimping | compression-bonding part is good also as 0.3 mm or more and 0.8 mm or less.

  According to said structure, a recessed part is distribute | arranged along with the comparatively small pitch space | interval of 0.3 mm or more and 0.8 mm or less. Thereby, the number of the recessed parts per unit area increases. Then, the edge area formed at the hole edge of the recess per unit area increases. Thereby, since the area | region where the edge formed in the hole edge of a recessed part bites into a core wire per unit area becomes comparatively large, the retention strength of the core wire by a crimping | compression-bonding part can be improved.

  Note that the pitch interval refers to the interval between diagonal lines in one recess and diagonal lines in another recess located next to one recess in the extending direction.

  The second pitch interval of the plurality of recesses formed in the crimping portion in the extending direction of the first hole edge may be 0.3 mm or more and 0.8 mm or less.

  According to said structure, a recessed part is distribute | arranged along with the comparatively small pitch space | interval of 0.3 mm or more and 0.8 mm or less. Thereby, the number of the recessed parts per unit area increases. Then, the edge area formed at the hole edge of the recess per unit area increases. Thereby, since the area | region where the edge formed in the 1st hole edge of a recessed part bites into a core wire per unit area becomes comparatively large, the retention strength of the core wire by a crimping | compression-bonding part can be improved.

  The length dimension of the 1st hole edge which constitutes the hole edge of the crevice may be set as 0.2 mm or more and 0.4 mm or less.

  When the crimping portion is crimped to the core wire, the edge of the first hole edge bites into the outer peripheral surface of the core wire. As a result, the core wire is securely held by the crimping portion. When the length dimension of the first hole edge is shorter than 0.2 mm, the holding force of the core wire by the crimping portion is not preferable. Moreover, when the length dimension of a 1st hole edge exceeds 0.4 mm, the space | interval of adjacent recessed parts will become narrow about the extending direction of a 1st hole edge. Then, since there is a concern that a mold for forming the concave portion is lacking, it is not preferable.

  The interval between the recesses adjacent in the direction in which the first hole edge extends may be set narrower than the interval between the recesses adjacent in the direction in which the electric wire extends.

  According to said structure, the area | region located between adjacent recessed parts about the extending direction of a 1st hole edge is easy to bite into a core wire, when a crimping | compression-bonding part is crimped | bonded to a core wire. Thereby, the oxide film formed on the core wire is peeled off, and the new surface of the core wire is exposed. As a result, the electrical resistance between the core wire and the terminal fitting can be reduced.

  Furthermore, since the second hole edge forms an angle of 25 ° or more and 35 ° or less with respect to the direction in which the electric wire extends, an area located between adjacent recesses in the direction in which the first hole edge extends also extends in the electric wire. It is formed at an angle of 25 ° to 35 ° with respect to the direction. As a result, even if the above-described region bites into the core wire, the core wire has an angle of 25 ° or more and 35 ° or less, so that the core wire is prevented from being broken. As a result, the fixing force between the electric wire and the terminal fitting can be improved.

  When the compression rate of the core wire crimped by the crimping portion is a percentage of the cross-sectional area of the core wire after the crimping portion is crimped, with respect to the cross-sectional area of the core wire before the crimping portion is crimped, The compression rate may be 40% or more and 70% or less.

  When the compression rate is defined as described above, decreasing the compression rate means compressing the core wire with a large pressure (high compression), and increasing the compression rate compresses the core wire with a small pressure. (Low compression).

  In order to break the oxide film formed on the surface of the core wire and reduce the electrical resistance, it is necessary to press the crimp portion to the core wire with a small compression rate. According to said structure, a crimping | compression-bonding part is crimped | bonded to an electric wire with a comparatively small compression rate that a compression rate is 40% or more and 70% or less. Thereby, the oxide film formed on the surface of the core wire can be effectively peeled off.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to reduce the electrical resistance of an electric wire and a terminal metal fitting, a metal mold manufacturing cost can be reduced.

The side view which shows the electric wire with a terminal metal fitting which concerns on this invention Perspective view showing female terminal fitting The principal part enlarged plan view which shows the female terminal metal fitting in the expansion | deployment state The principal part expansion perspective view which shows the recessed part formed in the wire barrel VV sectional view taken on the line in FIG. Sectional view taken along line VI-VI in FIG. The principal part enlarged plan view which shows the recessed part formed in the wire barrel Enlarged perspective view of the main part of a mold for press-molding female terminal fittings The principal part expanded sectional view which shows the state which crimped the wire barrel to the core wire The principal part enlarged plan view which shows the expansion | deployment state of the female terminal metal fitting which concerns on Embodiment 2. FIG. The principal part enlarged plan view which shows the recessed part formed in the wire barrel

  An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, this embodiment is the electric wire 10 with a terminal metal fitting by which the female terminal metal fitting 12 was crimped | bonded to the core wire 13 exposed from the terminal of the electric wire 11. As shown in FIG.

(Wire 11)
As shown in FIG. 1, the electric wire 11 includes a core wire 13 formed by twisting a plurality of fine metal wires, and an insulating coating 14 made of an insulating synthetic resin surrounding the outer periphery of the core wire 13. Aluminum or aluminum alloy can be used as the thin metal wire. In this embodiment, an aluminum alloy is used. As shown in FIG. 1, the insulation coating 14 is peeled off at the end of the electric wire 11, and the core wire 13 is exposed.

(Female terminal fitting 12)
The female terminal fitting 12 is formed by pressing a metal plate into a predetermined shape. The female terminal fitting 12 is an insulation barrel 15 that is crimped so as to be wound around the outer periphery of the insulation coating 14 of the electric wire 11, and a wire that is crimped so as to be wound around the core wire 13 from the outside in connection with the insulation barrel 15. A barrel 16 (corresponding to a crimping portion described in claims) and a connection portion 17 connected to a male terminal fitting (not shown) are connected to the wire barrel 16. As shown in FIG. 3, the insulation barrel 15 has a pair of plate shapes that protrude in the vertical direction.

  As shown in FIG. 2, the connection part 17 has comprised the cylinder shape which can insert the male tab (not shown) of a male terminal metal fitting. An elastic contact piece 26 is formed inside the connection portion 17, and the elastic contact piece 26 and the male tab of the male terminal fitting are in elastic contact with each other, so that the male terminal fitting and the female terminal fitting 12 are connected to each other. Are electrically connected.

  In the present embodiment, the female terminal fitting 12 is the female terminal fitting 12 having the cylindrical connection portion 17, but is not limited thereto, and may be a male terminal fitting having a male tab, or a through hole in a metal plate material. It is good also as what is called a LA terminal in which is formed, and it can be set as the terminal metal fitting of arbitrary shapes as needed.

(Wire barrel 16)
In FIG. 3, the principal part enlarged plan view of the wire barrel 16 in an unfolded state is shown. As shown in FIG. 3, the wire barrel 16 forms a pair of plates that protrude in the vertical direction in FIG. The wire barrel 16 has a substantially rectangular shape when viewed from the direction penetrating the paper surface of FIG. 3 before the electric wire is crimped.

  As shown in FIG. 3, the wire barrel 16 has a plurality of surfaces on the side where the electric wire 11 is arranged when the electric wire 11 is crimped (a surface located on the front side in the direction penetrating the paper surface in FIG. 3). A recess 18 is formed. The hole edge of each recess 18 has a parallelogram shape when viewed from the direction penetrating the paper surface of FIG. 3 before the electric wire 11 is crimped.

  The parallelogram forming the hole edge of each recess 18 is 85 ° or more and 95 ° with respect to the direction in which the core wire 13 extends in the state where the wire barrel 16 is crimped to the core wire 13 (the direction indicated by the arrow A in FIG. 3). A pair of first hole edges 19 intersecting at the following angles and a pair of second holes intersecting at an angle of 25 ° or more and 35 ° or less with respect to the extending direction of the core wire 13 (direction indicated by arrow A in FIG. 3). Edge 20. In the present embodiment, the first hole edge 19 is formed orthogonal to the extending direction of the core wire 13. In the present embodiment, the length dimension of the first hole edge 19 is 0.25 mm. The second hole edge 20 is formed at an angle of 30 ° with respect to the extending direction of the core wire 13.

  As shown in FIG. 3, the plurality of recesses 18 are formed in the direction (in FIG. 3) orthogonal to the direction in which the first hole edge 19 extends, that is, the direction in which the core wire 13 extends (the direction indicated by the arrow A in FIG. 3). Along the direction indicated by the arrow B). The first hole edges 19 of the adjacent recesses 18 are arranged side by side on a straight line along the direction in which the first hole edges 19 extend.

  As shown in FIG. 3, the plurality of recesses 18 are not less than 25 ° and not more than 35 ° with respect to the direction in which the second hole edge 20 extends, that is, the direction in which the core wire 13 extends (the direction indicated by the arrow A in FIG. They are arranged side by side along the direction forming the angle α. In the present embodiment, the plurality of recesses 18 are arranged side by side along a direction (direction indicated by arrow C in FIG. 3) that forms an angle α of 30 ° with respect to the extending direction of the core wire 13. Yes. The second hole edges 20 of the adjacent recesses 18 are arranged side by side on a straight line along the direction in which the second hole edges 20 extend.

  As shown in FIG. 3, at least one first hole edge 19 in the extending direction of the core wire 13 (the direction indicated by the arrow A in FIG. 3) is provided on the surface of the wire barrel 16 on which the core wire 13 is disposed. Is formed to be positioned.

  As shown in FIGS. 3 and 4, the bottom surface of the recess 18 has a shape similar to the hole edge of the recess 18, and is slightly smaller than the hole edge of the recess 18. Thus, the bottom surface of the recess 18 and the hole edge of the recess 18 are connected by four inclined surfaces 21 that expand from the bottom surface of the recess 18 toward the hole edge of the recess 18.

  As shown in FIG. 5, among the inclined surfaces 21, the first inclined surface 22 that connects the pair of first hole edges 19 and the bottom surface of the recess 18 is a surface of the wire barrel 16 on the side where the core wire 13 is disposed. In addition, it is formed with an angle β of 90 ° or more and 110 ° or less with respect to the surface of the portion where the recess 18 is not formed. In the present embodiment, the first inclined surface 22 is formed with an angle β of 105 °.

  As shown in FIG. 6, of the inclined surfaces 21, the second inclined surface 23 that connects the pair of second hole edges 20 and the bottom surface of the recess 18 is the side of the wire barrel 16 on which the core wire 13 is disposed. And an angle γ of 115 ° or more and 140 ° or less with respect to the surface of the portion where the recess 18 is not formed. In the present embodiment, the second inclined surface is formed with an angle γ of 120 °.

  Further, as shown in FIG. 7, among the plurality of recesses 18, an interval is formed in a direction (direction indicated by arrow C) that forms an angle of 30 ° with the extending direction of core wire 13 (direction indicated by arrow A in FIG. 7). The first pitch interval (P1 in FIG. 7) of the recesses 18 forming a row with respect to the extending direction of the core wire 13 (the direction indicated by the arrow A) is set to 0.3 mm or more and 0.8 mm or less. In this embodiment, it is set to 0.4 mm. Further, the extending direction of the core wire 13 (in the direction of the arrow A) between the recesses 18 that form a row at intervals in the direction (indicated by the arrow line B) orthogonal to the extending direction of the core wire 13 (the direction indicated by the arrow A). The second pitch interval (P2 in FIG. 7) in the direction orthogonal to the direction (shown by arrow B) is set to 0.3 mm or more and 0.8 mm or less. It is set to 5 mm.

  In the present embodiment, the compression ratio of the core wire 13 crimped by the wire barrel 16 is set to the cross-sectional area of the core wire 13 before the wire barrel 16 is crimped, of the cross-sectional area of the core wire 13 after the wire barrel 16 is crimped. The compression ratio is 40% or more and 70% or less. In this embodiment, it is set to 60%.

  Next, the operation and effect of this embodiment will be described. Below, an example of the attachment process of the female terminal metal fitting 12 with respect to the electric wire 11 is shown. First, a metal plate is formed into a predetermined shape by press molding. At this time, you may form the recessed part 18 simultaneously.

  Then, the connection part 17 is formed by bending the metal plate material formed in the predetermined shape (refer FIG. 2). At this time, the recess 18 may be formed.

  As shown in FIG. 8, a plurality of convex portions 25 are formed at positions corresponding to the concave portions 18 of the wire barrel 16 in the mold 24 when the female terminal fitting 12 is press-molded.

  As shown in FIG. 4, the recesses 18 formed in the wire barrel 16 are formed side by side along the extending direction of the first hole edge 19 (the direction indicated by the arrow B), and the second They are formed side by side along the direction in which the hole edge 20 extends (the direction indicated by the arrow C). For this reason, as shown in FIG. 8, the some convex part 25 formed in the position corresponding to the recessed part 18 among the metal mold | dies 24 is along the direction (direction shown by arrow B) where the 1st hole edge 19 extends. And formed side by side along a direction (indicated by arrow C) having an angle α of 30 ° with the extending direction of the core wire 13. Further, the first hole edge 19 of each recess 18 is arranged side by side on a straight line along the direction in which the first hole edge 19 extends (the direction indicated by the arrow B), and the second hole of each recess 18. The edge 20 is arranged side by side on a straight line along the direction in which the second hole edge 20 extends (the direction indicated by the arrow C).

  For this reason, as shown in FIG. 7, the area | region different from the area | region corresponding to the recessed part 18 is the direction (direction shown by arrow B) where the area | region different from the area | region corresponding to the recessed part 18 is arrange | positioned. And a plurality of strips extending in the direction of the second hole edge 20 (the direction indicated by the arrow C).

  Therefore, in order to form the plurality of convex portions 25 so as to be arranged at intervals, the metal member is left with a plurality of strips extending in a strip shape along the direction in which the first hole edge 19 extends. The grooves can be formed by cutting and a plurality of grooves extending in a strip shape along the extending direction of the second hole edge 20 can be manufactured by cutting. Thus, the metal mold | die 24 for press-molding the female terminal metal fitting 12 which concerns on this embodiment can be manufactured by cutting.

  Subsequently, the insulation coating 14 of the electric wire 11 is removed to expose the core wire 13. With the core wire 13 placed on the wire barrel 16 and the insulating coating 14 placed on the insulation barrel 15, the barrels 15 and 16 are placed outside the electric wire 11 by a mold (not shown). Crimp from.

  As shown in FIG. 9, when the wire barrel 16 is crimped to the core wire 13, the core wire 13 is pressed by the wire barrel 16 and plastically extends in the extending direction of the core wire 13 (the direction indicated by the arrow A in FIG. 9). . Then, the outer peripheral surface of the core wire 13 is in sliding contact with the hole edge of each recess 18. Thereby, the oxide film formed on the outer peripheral surface of the core wire 13 is peeled off, and the new surface of the core wire 13 is exposed. When the new surface comes into contact with the wire barrel 16, the core wire 13 and the wire barrel 16 are electrically connected.

  Further, according to the present embodiment, relatively large stress is concentrated on the core wire 13 in the region located between the plurality of recesses 18 in the wire barrel 16. Thereby, the oxide film formed on the surface of the core wire 13 can be reliably peeled off at the hole edge of each concave portion 18 to expose the new surface of the core wire 13.

  Moreover, according to this embodiment, since the 1st hole edge 19 cross | intersects at the angle of 85 degrees or more and 95 degrees or less with the extension direction of the core wire 13, it is the core wire 13 of the state crimped | bonded to the wire barrel 16 On the other hand, when a force along the extending direction of the electric wire 11 is applied, the movement of the core wire 13 is suppressed by the edge formed in the first hole edge 19. As a result, the new surface of the core wire 13 formed by sliding contact with the first hole edge 19 and the second hole edge 20 of the recess 18 can reliably contact the surface of the wire barrel 16 located in the vicinity of the recess 18. it can. As a result, the electrical resistance between the electric wire 11 and the female terminal fitting 12 can be reliably reduced.

  On the other hand, when the angle between the first hole edge 19 and the extending direction of the core wire 13 is less than 85 ° and exceeds 95 °, a force along the extending direction of the electric wire 11 is applied to the core wire 13. In such a case, there is a concern that depending on the edge formed in the first hole edge 19, the movement of the core wire 13 cannot be sufficiently retained. Then, there exists a possibility that the core wire 13 may move in the direction away from the surface of the wire barrel 16. As a result, a portion of the new surface of the core wire 13 that does not contribute to electrical connection with the wire barrel 16 is generated, and as a result, the electrical resistance between the electric wire 11 and the female terminal fitting 12 may not be sufficiently reduced. This is not preferable.

  The first inclined surface 22 that connects the first hole edge 19 of the recess 18 and the bottom surface of the recess 18 is a surface of the wire barrel 16 on the side where the core wire 13 is disposed, and the recess 18 is formed. It is formed at an angle β of 90 ° or more and 110 ° with respect to the surface of the portion that is not. As described above, the concave portion 18 is formed by pressing the convex portion 25 formed in the mold 24 against the metal plate material. For this reason, in order to easily remove the convex portion 25 of the mold 24 after pressing, the gap between the hole edge of the concave portion 18 and the bottom surface of the concave portion 18 increases from the bottom surface of the concave portion 18 toward the hole edge of the concave portion 18. An inclined surface 21 that expands is formed. That is, a right angle or an obtuse angle is formed between the inclined surface 21 and the surface of the wire barrel 16 on the side where the core wire 13 is disposed.

  A large angle formed between the inclined surface 21 and the surface of the wire barrel 16 on the side where the core wire 13 is disposed means that the edge formed at the hole edge of the recess 18 becomes gentle. . In the present embodiment, the angle β formed between the first inclined surface 22 and the surface of the wire barrel 16 on which the core wire 13 is disposed is 90 ° or more and 110 ° (105 ° in the present embodiment). And it is relatively small as a right angle or an obtuse angle. For this reason, the edge formed in the 1st hole edge 19 of the recessed part 18 is a comparatively sharp thing. As a result, the edge formed on the first hole edge 19 bites into the core wire 13 so that the oxide film formed on the core wire 13 can be reliably peeled off.

  On the other hand, the second hole edge 20 is formed with an angle α (30 ° in the present embodiment) of 25 ° or more and 35 ° or less with respect to the extending direction of the core wire 13. Thereby, the 1st hole edge 19 of the recessed parts 18 adjacent in the direction where the electric wire 11 is extended overlaps and is distribute | arranged about the direction where the electric wire 11 is extended. Thereby, the holding force of the core wire 13 by the wire barrel 16 is further improved. When the angle α formed between the second hole edge 20 and the direction in which the electric wire 11 extends is less than 25 ° and exceeds 35 °, the first hole edge 19 between the recesses 18 adjacent to each other in the direction in which the electric wire 11 extends. However, since the area | region which does not overlap about the extending direction of the electric wire 11 is formed, it is not preferable.

  The wire barrel 16 is crimped so as to be wound from the outside of the core wire 13. For this reason, the hole edge of the recessed part 18 deform | transforms in the direction closed about the direction (direction shown by arrow B of FIG. 3) orthogonal to the extension direction of the core wire 13. FIG.

  For this reason, if the angle γ between the second inclined surface 23 and the surface of the wire barrel 16 on which the core wire 13 is disposed is excessively small, the hole edge of the recess 18 is perpendicular to the extending direction of the core wire 13. There is concern that the second hole edge 20 cannot be slidably contacted with the core wire 13 because the second hole edge 20 is closed and closed.

  On the other hand, if the angle γ formed between the second inclined surface 23 and the surface of the wire barrel 16 where the core wire 13 is disposed and where the concave portion 18 is not formed is increased, the second hole There is a concern that the edge formed on the edge 20 becomes loose, it is difficult to bite into the core wire 13, and the oxide film formed on the core wire 13 is difficult to be removed.

  In view of the above points, in the present embodiment, between the second inclined surface 23 and the surface of the portion of the wire barrel 16 on which the core wire 13 is disposed and the recess 18 is not formed. The angle γ formed at 120 was 120 °. Thereby, even when the wire barrel 16 is pressure-bonded to the core wire 13, it is possible to prevent the hole edge of the recess 18 from being closed and closed in a direction orthogonal to the extending direction of the core wire 13, and to be formed in the second hole edge 20. Edge can be made relatively sharp. As a result, the edge formed in the second hole edge 20 bites into the core wire 13 so that the oxide film of the core wire 13 can be peeled off.

  Further, according to the present embodiment, the plurality of recesses 18 are arranged side by side with a relatively small first pitch interval P1 of 0.3 mm or more and 0.8 mm or less in the extending direction of the electric wire 11. Thereby, the number of the recessed parts 18 per unit area increases. As a result, the edge area formed at the hole edge of the recess 18 per unit area increases. Thereby, since the area | region where the edge formed in the hole edge of the recessed part 18 bites into the core wire 13 per unit area becomes comparatively large, the retention strength of the core wire 13 by the wire barrel 16 can be improved.

  In addition, according to the present embodiment, a relatively small second pitch interval P2 of 0.3 mm or more and 0.8 mm or less is set in a direction orthogonal to the extending direction of the electric wire 11 (extending direction of the first hole edge 19). The recesses 18 are arranged side by side. Thereby, the number of the recessed parts 18 per unit area increases. As a result, the edge area formed at the hole edge of the recess 18 per unit area increases. Thereby, since the area | region where the edge formed in the hole edge of the recessed part 18 bites into the core wire 13 per unit area becomes comparatively large, the retention strength of the core wire 13 by the wire barrel 16 can be improved.

  Moreover, in this embodiment, since the metal mold | die 24 can be formed by cutting, manufacturing cost can be reduced compared with the case where the metal mold | die 24 is formed by electric discharge machining.

  Moreover, according to this embodiment, the length dimension of the 1st hole edge is 0.25 mm, and is 0.2-0.4 mm. Thereby, the first hole edge 19 of the recess 18 formed in the wire barrel 16 bites into the outer peripheral surface of the core wire 13. Thereby, the core wire 13 is reliably held by the wire barrel 16. When the length dimension of the 1st hole edge 19 is shorter than 0.2 mm, since the retention strength of the core wire 13 by the wire barrel 16 reduces, it is not preferable. Moreover, if the length dimension of the 1st hole edge 19 exceeds 0.4 mm, the space | interval of adjacent recessed parts 18 will become narrow about the direction where the 1st hole edge 19 is extended. Then, in the metal mold | die 24, since there is concern that the convex part 25 for forming the recessed part 18 may be missing, it is not preferable.

  In the present embodiment, the core wire 13 is made of an aluminum alloy. Thus, when the core wire 13 is made of an aluminum alloy, an oxide film is relatively easily formed on the surface of the core wire 13. In the present embodiment, even when the core wire 13 is made of an aluminum alloy, the electrical resistance between the electric wire 11 and the female terminal fitting 12 can be reduced.

  Furthermore, in order to break the oxide film formed on the surface of the core wire 13 and reduce the electric resistance, it is necessary to press the wire barrel 16 to the core wire 13 with a relatively small compression rate. According to this embodiment, the wire barrel 16 is crimped to the electric wire 11 with a relatively small compression rate such that the compression rate is 40% or more and 70% or less. Thereby, the oxide film formed on the surface of the core wire 13 can be effectively peeled off. The compression ratio can be appropriately changed within the above range. For example, the compression ratio is 50% or more and 60% or less, or 40% or more and 50% or less when the cross-sectional area of the core wire 13 of the electric wire 11 is large. You can also. The compression rate is defined as {(core line area after compression) / (core line area before compression)} × 100.

  Hereinafter, the present invention will be described in detail based on examples. In addition, this invention is not limited at all by the following Example.

<Example 1-1>
First, a metal mold was prepared by cutting a plurality of grooves on a metal member to form a convex portion having a predetermined shape. Using this mold, a metal plate made of a copper alloy whose surface was plated with tin was pressed, and further bent to produce a terminal fitting. The thickness dimension of the metal plate material was 0.25 mm.

  The shape of the recess formed in the wire barrel of the terminal fitting was as follows. The angle formed by the first hole edge with respect to the extending direction of the electric wire is 85 °, the angle formed by the second hole edge with respect to the extending direction of the electric wire is 30 °, and the core wire is arranged between the first inclined surface and the wire barrel. The angle between the surface of the side and the surface of the portion where the recess is not formed is 105 °, the second inclined surface and the surface of the wire barrel on which the core wire is disposed, and the recess is formed. The angle formed with the surface of the non-existing portion was 120 °, and the pitch interval between adjacent concave portions was 0.4 mm in the direction in which the electric wire (core wire) extends, and 0.5 mm in the direction in which the first hole edge extends. .

  On the other hand, the insulation coating was peeled off at the end of the electric wire to expose the aluminum alloy core wire. The cross-sectional area of the core wire was 0.75 mm2. Then, the wire barrel was crimped | bonded with respect to the exposed core wire. The compression rate of the core wire was 60%.

<Examples 1-2 and 1-3>
In Example 1-2, the angle formed by the first hole edge with respect to the extending direction of the electric wire was 90 °. Moreover, in Example 1-3, the angle formed by the first hole edge with respect to the extending direction of the electric wire was 95 °. Except the above, it carried out similarly to Example 1-1, and produced the electric wire with a terminal metal fitting which concerns on Example 1-2 and Example 1-3.

<Comparative Examples 1-1 to 1-4>
About the electric wire with a terminal metal fitting which concerns on Comparative Examples 1-1 thru | or 1-4, the angle which the 1st hole edge makes with respect to the extending direction of an electric wire was set to the value shown in Table 1, respectively. Except for the above, an electric wire with a terminal fitting was produced in the same manner as in Example 1-1.

  For the electric wire with terminal fittings produced as described above, the fixing force (holding force) between the electric wires and the terminal fittings and the electrical resistance between the core wire and the terminal fittings were measured.

(Electrical resistance measurement and adhesion force measurement)
The heating step of heating at 125 ° C. for 0.5 hour and the cooling step of cooling at −40 ° C. for 0.5 hour are repeated 250 cycles for the wire with terminal fitting, and the core wire and the wire barrel A load due to thermal expansion was repeatedly applied to the connection part.

About the said test goods, the electrical resistance between a terminal metal fitting and a core wire was measured. Measurements were performed on 20 samples, and the average values are shown in Table 1.
Thereafter, the terminal fitting and the electric wire were each held with a jig, and a tensile test was performed. The pulling speed was 100 mm / sec. The stress when the electric wire was detached from the wire barrel of the terminal fitting was defined as the value of the fixing force. Ten samples were tested and the average values are listed in Table 1.

  As shown in Table 1, for Comparative Examples 1-1 and 1-2 in which the angle formed by the first hole edge with respect to the extending direction of the electric wire is less than 85 °, the electrical resistance between the core wire and the terminal fitting Was 1.2 mΩ. Further, in Comparative Examples 1-3 and 1-4 in which the angle formed by the first hole edge with respect to the extending direction of the electric wire is greater than 95 °, the electrical resistance between the core wire and the terminal fitting was 1.2 mΩ. It was.

  On the other hand, in Examples 1-1 to 1-3 in which the angle formed by the first hole edge with respect to the extending direction of the electric wire is 85 ° to 95 °, the electrical resistance between the core wire and the terminal fitting is It was 0.5 mΩ. Thus, in the electric wire with a terminal metal fitting according to Examples 1-1 to 1-3, the electrical resistance between the core wire and the terminal metal fitting with respect to the electric wire with the terminal metal fitting according to Comparative Examples 1-1 to 1-4. Was reduced by about 58%.

  In Examples 1-1 to 1-3, the first hole edge is arranged so as to intersect with the extending direction of the core wire at an angle of 85 ° or more and 95 ° or less. Thereby, when a force along the extending direction of the electric wire is applied to the core wire in a state of being crimped to the wire barrel by bending the electric wire, the edge of the core wire is formed by the edge formed in the first hole edge. Movement is suppressed. Thereby, the new surface of the core wire formed by sliding contact with the first hole edge of the recess can reliably contact the surface of the wire barrel located in the vicinity of the recess. As a result, it is considered that the electrical resistance between the electric wire (core wire) and the terminal fitting could be reliably reduced.

  On the other hand, in Comparative Examples 1-1 and 1-2, the angle formed between the first hole edge and the extending direction of the core wire is less than 85 °. In Comparative Examples 1-3 and 1-4, The angle formed with the direction in which the core wire extends exceeds 95 °. For this reason, when the force along the extending direction of the electric wire is applied to the core wire, it is considered that the movement of the core wire cannot be sufficiently held depending on the edge formed in the first hole edge. Then, the core wire moves in a direction away from the surface of the wire barrel, and as a result, a portion that does not contribute to electrical connection with the wire barrel is generated on the new surface of the core wire. Thereby, it is considered that the electrical resistance between the electric wire and the terminal fitting could not be sufficiently reduced.

  On the other hand, as for the adhering force, the adhering force between the electric wire and the terminal fitting in Comparative Examples 1-1 to 1-4 was 55 N or less.

  On the other hand, in Example 1-1 thru | or 1-3, the adhering force between an electric wire and a terminal metal fitting was 63 N or more. Thus, by making the angle formed by the first hole edge with respect to the extending direction of the electric wire between 85 ° and 95 °, the fixing force between the electric wire and the terminal fitting can be improved by about 15%. did it. In particular, in Example 1-2 in which the angle formed by the first hole edge with respect to the extending direction of the electric wire is 90 °, the fixing force was 65N. From this result, the angle formed by the first hole edge with respect to the extending direction of the electric wire is preferably 90 °.

  In Examples 1-1 to 1-3, the first hole edge is arranged so as to intersect with the extending direction of the core wire at an angle of 85 ° or more and 95 ° or less. As a result, when a force along the direction in which the electric wire extends is applied to the core wire crimped to the wire barrel, the core wire is held by the edge formed at the first hole edge, and the movement of the core wire is suppressed. The As a result, it is considered that the fixing force between the electric wire and the terminal fitting could be improved.

<Examples 2-1 to 2-3 and Comparative Example 2-1>
The angle formed by the first hole edge with respect to the extending direction of the electric wire was set to 90 °, and the angle formed by the second hole edge with respect to the extending direction of the electric wire was set to the values described in Table 2 in the same manner as in Example 1. An electric wire with a terminal fitting was produced.

<Comparative Example 2-2>
A metal mold was prepared so that the angle formed by the second hole edge with respect to the extending direction of the electric wire was 45 °, and the metal plate was pressed. I couldn't.

  For Examples 2-1 to 2-3 and Comparative Example 2-1, the fixing force was measured in the same manner as in Example 1, and the electrical resistance was measured. The results are summarized in Table 2.

  As shown in Table 2, in the electric wire with terminal fitting according to Comparative Example 2-1, in which the angle formed between the extending direction of the electric wire and the second hole edge is 0 °, the adhesion force between the electric wire and the terminal fitting ( Holding power) was 45N.

  On the other hand, in the electric wires with terminal fittings according to Examples 2-1 to 2-3 in which the angle formed between the extending direction of the electric wires and the second hole edge is 25 ° to 35 °, The fixing force between them was 62N or more. Thus, in the electric wires with terminal fittings according to Examples 2-1 to 2-3, the fixing force between the electric wires and the terminal fittings is about 38 with respect to the electric wires with terminal fittings according to Comparative Example 2-1. % Could be improved.

  In the electric wires with terminal fittings according to Examples 2-1 to 2-3 in which the angle between the extending direction of the electric wire and the second hole edge is 25 ° or more and 35 ° or less, the adjacent recesses in the extending direction of the electric wire The first hole edge is arranged so as to overlap in the extending direction of the electric wire (see FIG. 7). Thereby, the area | region where the edge formed in the 1st hole edge of a recessed part bites into a core wire necessarily exists about the extension direction of an electric wire. Thereby, it is thought that the holding power of the core wire by the wire barrel could be further improved.

  On the other hand, in Comparative Example 2-1, in which the angle between the second hole edge and the extending direction of the electric wire is 0 °, the first hole edge between the recesses adjacent to each other in the extending direction of the electric wire is It is considered that a region that does not overlap in the direction is formed. For this reason, it is considered that the fixing force between the electric wire and the terminal fitting is a relatively low value of 45N.

  In addition, it is impossible to form a recess in which the angle formed between the second hole edge and the direction in which the electric wire extends is set to 45 ° because the mold is lost when the metal plate material is pressed.

  Moreover, in the electric wire with a terminal metal fitting according to Comparative Example 2-1, the electrical resistance between the core wire and the terminal metal fitting was 1.5 mΩ, whereas with the terminal metal fitting according to Examples 2-1 to 2-3. The electric resistance between the core wire and the terminal fitting in the electric wire was 0.5 mΩ, and could be reduced by about 67% compared to Comparative Example 2-1.

<Examples 3-1 to 3-3 and Comparative Examples 3-1 and 3-2>
The angle formed by the first hole edge with respect to the direction in which the electric wire extends is 90 °, and the first inclined surface and the surface of the wire barrel on the side where the core wire is disposed and the portion where no recess is formed An electric wire with a terminal fitting was produced in the same manner as in Example 1 except that the angle formed by (hereinafter also referred to as the angle formed by the first inclined surface) was set to the values described in Table 3.

  When the angle formed by the first inclined surface is less than 90 °, the angle formed by the first inclined surface becomes an overhang, so that the terminal fitting cannot be formed by press working.

  For Examples 3-1 to 3-3 and Comparative Examples 3-1 and 3-2, the fixing force was measured in the same manner as in Example 1, and the electrical resistance was measured. The results are summarized in Table 3.

  As shown in Table 3, in Comparative Examples 3-1 and 3-2 in which the angle formed by the first inclined surface exceeds 110 °, the electrical resistance between the core wire and the terminal fitting was 1.2 mΩ. On the other hand, in Examples 3-1 to 3-3 in which the angle formed by the first inclined surface is 90 ° to 110 °, the electrical resistance between the core wire and the terminal fitting was 0.5 mΩ. Thus, in the electric wires with terminal metal fittings according to Examples 3-1 to 3-3, the electric power between the core wire and the terminal metal fittings with respect to the electric wires with terminal metal fittings according to Comparative Examples 3-1 and 3-2. The resistance could be reduced by about 58%.

  As described above, the concave portion is formed by pressing the convex portion formed in the mold against the metal plate. For this reason, the angle formed by the first inclined surface is a right angle or an obtuse angle in order to easily release the convex portion of the mold after pressing.

  In Examples 3-1 to 3-3, the angle formed by the first inclined surface is 90 ° or more and 110 ° or less, and the right angle or the obtuse angle is relatively small. For this reason, the edge formed in the 1st hole edge of a recessed part is a comparatively sharp thing. As a result, it is considered that the edge formed at the edge of the first hole bites into the core wire, so that the oxide film formed on the core wire is surely peeled off, and the new surface of the core wire and the terminal fitting are in contact with each other. Thereby, it is thought that the electrical resistance between a core wire and a terminal metal fitting was reduced.

  On the other hand, in Comparative Examples 3-1 and 3-2, the angles formed by the first hole edges are 120 ° and 125 °, respectively, which are relatively large as obtuse angles. For this reason, since the edge formed in the 1st hole edge could not fully dig into a core wire, it is thought that the electrical resistance between a core wire and a terminal metal fitting did not fully fall.

  Furthermore, in Comparative Examples 3-1 and 3-2, the fixing force between the electric wire and the terminal fitting was 55 N or less, whereas in Examples 3-1 to 3-3, the electric wire and the terminal fitting were used. The sticking force between them was 62 N or more. In this way, by setting the angle formed by the first inclined surface to 90 ° or more and 110 ° or less, the fixing force between the electric wire and the terminal fitting could be improved by about 13%.

<Examples 4-1 to 4-4 and Comparative Examples 4-1 and 4-2>
The angle formed by the first hole edge with respect to the direction in which the electric wire extends is 90 °, and the second inclined surface and the surface of the wire barrel on the side where the core wire is disposed and the portion where no recess is formed An electric wire with a terminal fitting was produced in the same manner as in Example 1 except that the angle formed by (hereinafter also referred to as the angle formed by the second inclined surface) was set to the values described in Table 4.

  For Examples 4-1 to 4-4 and Comparative Examples 4-1 and 4-2, the fixing force was measured in the same manner as in Example 1, and the electrical resistance was measured. The results are summarized in Table 4.

  As shown in Table 4, the electrical resistance between the core wire and the terminal fitting is 1.4 mΩ in Comparative Example 4-1, in which the angle formed by the second inclined surface is 105 °, and is formed by the second inclined surface. In Comparative Example 4-2 where the angle was 150 °, it was 1.5 mΩ.

  In contrast, in Examples 4-1 to 4-4 in which the angle formed by the second inclined surface is 115 ° or more and 140 ° or less, the electrical resistance between the core wire and the terminal fitting is 0.7 mΩ or less. It was. Thus, by setting the angle formed by the second inclined surface to 115 ° or more and 140 ° or less, the electrical resistance between the core wire and the terminal fitting could be reduced by about 50%. In Examples 4-1 to 4-3, since the electrical resistance between the core wire and the terminal fitting is 0.5 mΩ, the angle formed by the second inclined surface is preferably 115 ° to 130 °.

  A wire barrel is crimped | bonded so that it may wind from the outer side of a core wire. For this reason, when the wire barrel is crimped so that the wire barrel is wound around the core wire, the recess formed in the inner peripheral surface of the wire barrel is deformed so that the opening area of the hole edge portion is reduced. At this time, if the angle formed by the second inclined surface is excessively small, there is a concern that the opening area of the hole edge portion of the recess becomes excessively small and may be closed in some cases. Then, it is considered that the second hole edge of the concave portion cannot be brought into sliding contact with the core wire, and it becomes difficult to expose the new surface of the core wire. For the reasons described above, in Comparative Example 4-1, it is considered that the electrical resistance between the core wire and the terminal metal fitting is relatively large, 1.4 mΩ.

  On the other hand, if the angle formed by the second inclined surface is excessively increased, there is a concern that the edge formed at the second hole edge becomes gentle. For this reason, there is a concern that the edge of the second hole edge will not easily bite into the core wire, the oxide film formed on the core wire will be difficult to remove, and it will be difficult to expose the new surface of the core wire. For the reasons described above, in Comparative Example 4-2, it is considered that the electrical resistance between the core wire and the terminal fitting is relatively large at 1.5 mΩ.

  In Examples 4-1 to 4-4 in which the angle formed by the second inclined surface is 115 ° or more and 140 ° or less, even when the wire barrel is pressure-bonded to the core wire, the opening area of the hole edge portion of the recess is excessively large. It can suppress that it becomes small or the hole edge part of a recessed part closes. Furthermore, the edge formed in the second hole edge can be made relatively sharp. As a result, the edge formed at the edge of the second hole bites into the core wire, so that the oxide film of the core wire can be peeled off and the new surface of the core wire can be brought into contact with the terminal fitting. Thereby, it is considered that the electrical resistance between the core wire and the terminal fitting could be reduced.

<Examples 5-1 to 5-4 and Comparative Example 5-2>
Example 1 except that the angle formed by the first hole edge with respect to the extending direction of the electric wire is 90 °, and the first pitch interval of the plurality of recesses in the extending direction of the core wire is set to the value described in Table 5. In the same manner, an electric wire with terminal fittings was produced.

<Comparative Example 5-1>
When a metal mold was produced so that the first pitch interval was 0.2 mm and the metal plate material was pressed, a metal fitting could not be produced because the convex part of the metal mold was missing.

  For Examples 5-1 to 5-4 and Comparative Example 5-2, the fixing force was measured in the same manner as in Example 1, and the electrical resistance was measured. The results are summarized in Table 5.

  As shown in Table 5, in Comparative Example 5-2 in which the first pitch interval of the plurality of concave portions in the extending direction of the core wire is 1.5 mm, the fixing force between the electric wire and the terminal fitting is 38N. there were. On the other hand, in Examples 5-1 to 5-4 in which the first pitch interval in the extending direction of the core wire is 0.3 mm or more and 0.8 mm or less, the fixing force between the electric wire and the terminal fitting is 60N. Thus, by setting the first pitch interval in the extending direction of the core wire to 0.3 mm or more and 0.8 mm or less, the adhesion force between the electric wire and the terminal fitting could be improved by about 58%. .

  In Examples 5-1 to 5-4, the plurality of recesses are arranged side by side with a relatively small first pitch interval of 0.3 mm or more and 0.8 mm or less in the extending direction of the electric wire. This increases the number of recesses per unit area. Then, the edge area formed at the hole edge of the recess per unit area increases. Thereby, the area | region which the edge formed in the hole edge of a recessed part bites into a core wire per unit area can be increased. As a result, since the holding force of the core wire by the wire barrel is improved, it is considered that the fixing force between the electric wire and the terminal fitting could be increased.

  Furthermore, in Comparative Example 5-2, the electrical resistance between the core wire and the terminal metal fitting was 1.2 mΩ, whereas in Examples 5-1 to 5-4, the electrical resistance between the core wire and the terminal metal fitting was between. The electrical resistance was 0.8 mΩ. Thus, by setting the first pitch interval to 0.3 mm or more and 0.8 mm or less, the electrical resistance between the core wire and the terminal fitting could be reduced by about 33%. Moreover, since the electrical resistance between the electric wire and the terminal fitting in Examples 5-1 to 5-3 is 0.5 mΩ, the first pitch interval is preferably 0.3 mm or more and 0.5 mm or less.

<Examples 6-1 to 6-4 and Comparative Example 6-2>
The angle formed by the first hole edge with respect to the extending direction of the first hole edge is set to 90 °, and the first pitch interval of the plurality of recesses in the extending direction of the core wire is set to a value described in Table 6. Produced the electric wire with a terminal metal fitting similarly to Example 1. FIG.

<Comparative Example 6-1>
When a metal mold was produced so that the first pitch interval was 0.2 mm and the metal plate material was pressed, a metal fitting could not be produced because the convex part of the metal mold was missing.

  For Examples 6-1 to 6-4 and Comparative Example 6-2, the fixing force was measured in the same manner as in Example 1, and the electrical resistance was measured. The results are summarized in Table 6.

  As shown in Table 6, in Comparative Example 6-2 in which the second pitch interval of the plurality of recesses in the extending direction of the first hole edge was 1.5 mm, the fixing force between the electric wire and the terminal fitting Was 43N. On the other hand, in Examples 6-1 to 6-4 in which the second pitch interval in the extending direction of the core wire is 0.3 mm or more and 0.8 mm or less, the fixing force between the electric wire and the terminal fitting is 62N. As described above, by setting the first pitch interval in the extending direction of the core wire to 0.3 mm or more and 0.8 mm or less, the fixing force between the electric wire and the terminal fitting can be improved by about 44%. .

  In Examples 6-1 to 6-4, the plurality of recesses are arranged side by side with a relatively small first pitch interval of 0.3 mm or more and 0.8 mm or less in the extending direction of the electric wire. This increases the number of recesses per unit area. Then, the edge area formed at the hole edge of the recess per unit area increases. Thereby, the area | region which the edge formed in the hole edge of a recessed part bites into a core wire per unit area can be increased. As a result, since the holding force of the core wire by the wire barrel is improved, it is considered that the fixing force between the electric wire and the terminal fitting could be increased.

  Furthermore, in Comparative Example 6-2, the electrical resistance between the core wire and the terminal metal fitting was 1.2 mΩ, whereas in Examples 6-1 to 6-4, the electrical resistance between the core wire and the terminal metal fitting was between. The electric resistance was 0.7 mΩ. Thus, by setting the second pitch interval to 0.3 mm or more and 0.8 mm or less, the electrical resistance between the core wire and the terminal fitting could be reduced by about 42%. Moreover, since the electrical resistance between the electric wire and the terminal fitting in Examples 6-1 to 6-3 is 0.5 mΩ, the second pitch interval is preferably 0.3 mm or more and 0.5 mm or less.

<Embodiment 2>
Next, Embodiment 2 will be described with reference to FIGS. 10 and 11. In the present embodiment, the length dimension of the first hole edge 19 is set to 0.38 mm. Further, the interval L1 between the recesses 18 adjacent to each other in the extending direction of the first hole edge 19 (the direction indicated by the arrow B in FIG. 11) is adjacent to the extending direction of the core wire 13 (the direction indicated by the arrow A in FIG. 11). It is set to be narrower than the interval L2 between the matching recesses 18. In the present embodiment, the interval L1 is set to 0.12 mm, and the interval L2 is set to 0.19 mm.

  Moreover, the 1st area | region 40 located between the recessed parts 18 adjacent about the extension direction of the 1st hole edge 19 is extended about the extension direction (direction shown by arrow C in FIG. 11) of the 2nd hole edge 20. As shown in FIG. As described above, the extending direction of the second hole edge 20 forms an angle of 30 ° with respect to the extending direction of the core wire 13.

  Moreover, the 2nd area | region 41 located between the recessed parts 18 adjacent about the extension direction of the core wire 13 is extended and formed in the extension direction (direction orthogonal to the extension direction of the core wire 13) of the 1st hole edge 19. As shown in FIG.

  Since the configuration other than the above is substantially the same as that of the first embodiment, the same members are denoted by the same reference numerals, and redundant description is omitted.

  When the wire barrel 16 is pressure-bonded to the core wire 13, the first region 40 and the second region 41 located between the plurality of adjacent recesses 18 in the wire barrel 16 are pressed against the outer peripheral surface of the core wire 13. Then, the oxide film formed on the outer peripheral surface of the core wire 13 is destroyed, and the new surface of the core wire 13 is exposed. When the new surface comes into contact with the wire barrel 16, the core wire 13 and the wire barrel 16 are electrically connected.

  In the present embodiment, the interval L1 between the recesses 18 adjacent in the extending direction of the first hole edge 19 is set to be narrower than the interval L2 between the recesses 18 adjacent in the extending direction of the core wire 13. Therefore, the first region 40 located between the adjacent recesses 18 in the extending direction of the first hole edge 19 is wider than the second region 41 positioned between the adjacent recesses 18 in the extending direction of the core wire 13. It is formed narrowly.

  Thus, since the 1st field 40 is formed comparatively narrowly, it is easy to bite into core wire 13. As a result, the first region bites into the outer peripheral surface of the core wire 13, whereby the electrical resistance between the core wire 13 and the female terminal fitting 12 can be reduced.

  The first region 40 extends at an angle of 30 ° with respect to the extending direction of the core wire 13. For this reason, the first region 40 bites into the core wire 13 in a posture inclined with respect to the extending direction of the core wire 13. Therefore, as compared with the case where the first region 40 is formed orthogonal to the extending direction of the core wire 13, the core wire 13 is prevented from being broken by the first region 40 biting into the core wire 13. Thereby, it can suppress that the retention strength (adhesion force) between the electric wire 11 and the female terminal metal fitting 12 falls.

  Note that the second region 40 extending perpendicularly to the extending direction of the core wire 13 also bites into the outer peripheral surface of the core wire 13 when the wire barrel 16 is crimped to the core wire 13. However, since the second region is formed relatively wide, the core wire 13 is prevented from being broken.

<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 present embodiment, the first pitch P1 in the extending direction of the core wire 13 of the plurality of recesses 18 formed in the wire barrel 16 is 0.4 mm, and in the extending direction of the core wire 13 On the other hand, the second pitch interval P2 in the direction orthogonal to each other is 0.5 mm. However, the present invention is not limited to this, and both pitch intervals can be arbitrarily set as necessary. Further, both pitch intervals may be different from each other or may be the same value.
(2) In Embodiment 1, the length of the 1st hole edge 19 which comprises the hole edge of the recessed part 18 is set to 0.25 mm, and the length of the 1st hole edge 19 which concerns on Embodiment 2 is set. Although the thickness was set to 0.38 mm, the length is not limited to this, and the length of the first hole edge 19 constituting the hole edge of the recess 18 can be arbitrarily set as necessary.
(3) In the present embodiment, an aluminum electric wire is used, but even when a copper electric wire is used, the adhesion force between the electric wire and the terminal metal fitting is not as great as that of the aluminum electric wire due to the adhesive force, etc. Compared to the prior art, there is no drawback caused by the electrical resistance between the electric wire and the terminal fitting. For this reason, this invention can also be used for copper electric wires, and this invention can also be used for the terminal metal fitting applicable to both a copper electric wire and an aluminum electric wire.

10 ... Electric wire with terminal fitting 11 ... Electric wire 12 ... Female terminal fitting (terminal fitting)
13 ... Core wire 16 ... Wire barrel (crimp)
17 ... Connection part 18 ... Recess 19 ... First hole edge 20 ... Second hole edge 22 ... First inclined surface 23 ... Second inclined surface

Claims (6)

A terminal fitting provided with a crimping portion to be crimped so as to be wound around the core wire exposed from an electric wire including a core wire made of aluminum or an aluminum alloy,
In the state before the crimping portion is crimped to the core wire, a plurality of recesses are formed on the surface of the crimping portion on the side where the core wire is disposed, and the hole edges of the recesses are parallel to each other. A first hole edge of
The plurality of recesses are arranged side by side along the extending direction of the first hole edge, and are arranged side by side along the extending direction of the electric wire,
The first hole edge has an angle of 85 ° or more and 95 ° or less with respect to the extending direction of the electric wire,
The terminal fitting with which the space | interval of the said recessed parts adjacent about the direction where the said 1st hole edge extends is set narrower than the space | interval of the said recessed parts adjacent about the direction where the said electric wire extends.   The concave portion has a parallelogram shape, and has a pair of second hole edges parallel to each other different from the first hole edge. The terminal fitting according to claim 1, which has an angle of less than or equal to °.   3. The first hole edge according to claim 1, wherein the first hole edge is arranged so as to overlap in a direction in which the electric wire extends, and the first hole edge exists in the crimping portion in the direction in which the electric wire extends. Terminal fitting. An electric wire with a terminal fitting comprising: an electric wire having an insulation coating on the outer periphery of a core wire made of aluminum or an aluminum alloy; and a terminal fitting that is crimped to the core wire exposed from the electric wire,
The terminal fitting includes a crimping part that is crimped so as to be wound around the core wire, and the crimping part is attached to a surface of the crimping part on the side where the core wire is arranged before being crimped to the core wire. Has a plurality of recesses, and the hole edges of the recesses include a pair of first hole edges parallel to each other,
The plurality of recesses are arranged side by side along the extending direction of the first hole edge, and are arranged side by side along the extending direction of the electric wire,
The first hole edge has an angle of 85 ° or more and 95 ° or less with respect to the extending direction of the electric wire,
The electric wire with a terminal fitting, wherein an interval between the concave portions adjacent to each other in the extending direction of the first hole edge is set narrower than an interval between the concave portions adjacent to each other in the extending direction of the electric wire.   The concave portion has a parallelogram shape, and has a pair of second hole edges parallel to each other different from the first hole edge. The electric wire with a terminal fitting according to claim 4, wherein the electric wire has an angle of less than or equal to °.   6. The first hole edge according to claim 4 or 5, wherein the first hole edge is arranged so as to overlap in the extending direction of the electric wire, and the first hole edge exists in the crimping portion in the extending direction of the electric wire. Electric wire with terminal fittings.

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