JP2010027464A - Terminal fitting and electric wire therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal fitting for suppressing the barrel buckling, and to provide an electric wire therewith. <P>SOLUTION: The terminal fitting comprises a bottom plate 30 on which a core wire 13 exposed from the terminal of the electric wire 11 is placed, the pair of wire barrels 16 rising from both sides of the bottom plate 30 and pressure-bonded to be wound on the core wire 13, contact faces 27 formed on the wire barrels 16 to contact the core wire 13, and first recessed portions 18 formed in the contact faces 27 of the wire barrels 16 while continuously extending at least from a position near the bottom plate 30 to positions near the ends of the wire barrels 16 along the peripheral direction of the core wire 13 in the state that the wire barrels 16 are pressure-bonded to the core wire 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  Conventionally, the terminal metal fitting described in Patent Document 1 is known as a terminal fitting to be crimped to an end portion of an electric wire. This includes a bottom plate on which the core wire exposed from the end of the electric wire is placed, and a pair of barrels that protrude from both side portions of the bottom plate and are crimped to the core wire so as to be wound around the core wire.

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

  Therefore, in the prior art, a plurality of recesses are formed on the contact surface of the bottom plate or barrel that contacts the core wire. The recesses are formed side by side with an interval in the direction in which the electric wire extends in a state where the barrel is crimped to the core wire.

When the barrel is pressure-bonded to the core wire of the electric wire, the core wire is pressed by the barrel and plastically deformed and enters the recess. Then, the oxide film formed on the surface of the core wire is peeled off by being in sliding contact with the opening edge of the recess. Then, the new surface of the core wire comes into contact with the barrel. Thereby, the electrical resistance between an electric wire and a terminal metal fitting can be made small.
JP-A-10-125362

  However, when it is required to further reduce the electrical resistance between the electric wire and the terminal fitting, it may be difficult to sufficiently reduce the electrical resistance depending on the above method.

  Therefore, in the bottom plate and the barrel, a plurality of concave portions are formed on the contact surface in contact with the core wire in a state where the barrel is press-bonded to the core wire, and the circumferential direction of the core wire is also arranged at intervals. Can be considered. Thereby, since the area of the opening edge of a recessed part increases, the area where the surface of a core wire and the opening edge of a recessed part slidably contact increases, and it is anticipated that the area of the new surface exposed from a core wire will increase. As a result, it was expected to further reduce the electrical resistance between the electric wire and the terminal fitting.

  However, in the barrel, the region where the recess is formed has a smaller barrel thickness than the region where the recess is not formed. For this reason, the thickness dimension of the barrel is discontinuous near the boundary (opening edge of the recess) between the recess and the region where the recess is not formed. Thereby, when crimping | bonding a barrel to a core wire, there exists a tendency for stress to concentrate on the opening edge vicinity of a recessed part.

  And according to said structure, the some recessed part is formed in the contact surface of a barrel along with the space | interval about the circumferential direction of the core wire. For this reason, in the vicinity of the opening edge of the recesses adjacent to each other in the circumferential direction of the core wire, there is a concern that the barrel buckles as a result of stress concentration. FIG. 5 shows an example of the state where the barrel 46 is buckled in the vicinity of the opening edge between the recesses 48 adjacent to each other in the circumferential direction of the core wire 43. In this state, the pressure applied from the barrel 46 to the core wire 43 is insufficient, and the surface of the core wire 43 and the opening edge of the concave portion 48 cannot sufficiently come into sliding contact with each other. As a result, the electrical resistance between the electric wire and the terminal fitting increases. There is concern.

  This invention is completed based on the above situations, Comprising: It aims at providing the terminal metal fitting and the electric wire with a terminal metal fitting with which the barrel was suppressed from buckling.

  The present invention is a terminal fitting, a bottom plate on which a core wire exposed from an end of an electric wire is placed, a pair of barrels that rise from both side portions of the bottom plate and are crimped so as to be wound around the core wire, and the bottom plate A connecting portion extending from the connecting terminal and connected to the mating terminal, a contact surface formed on the barrel and contacting the core wire, and formed on the contact surface of the barrel, at least from the position near the bottom plate, the end of the barrel A first recess extending continuously along a circumferential direction of the core wire in a state where the barrel is crimped to the core wire until reaching a position near the portion.

  Moreover, this invention is an electric wire with a terminal metal fitting, Comprising: The electric wire containing a core wire and the terminal metal fitting crimped | bonded to the terminal of the said electric wire are provided.

  According to the present invention, the barrel is wound around the core wire and crimped. By being crimped to the core wire, the barrel compresses the core wire. The core wire is plastically deformed by receiving pressure from the barrel, and enters the first recess formed in the barrel. Then, the opening edge of the first recess and the surface of the core wire are in sliding contact with each other, and the oxide film formed on the surface of the core wire is peeled off. Thereby, the new surface of the core wire is exposed. The core wire and the terminal fitting are electrically connected by contacting the new surface and the barrel.

  Further, in the barrel, a region where the concave portions are adjacent to each other in the circumferential direction of the core wire is not formed at least from the position near the bottom plate to the position near the end of the barrel. As a result, in the region between the position near the bottom plate of the barrel and the position near the end of the barrel, a region where stress is concentrated is not formed, so that the barrel is prevented from buckling.

As embodiments of the present invention, the following embodiments are preferable.
The first recess may be formed up to a position near the end of the barrel.

  A relatively large force is required to buckle the end of the barrel. According to said structure, the opening edge of the 1st recessed part where stress tends to concentrate is distribute | arranged to the position near the edge part of a barrel. Thereby, it can suppress that a barrel buckles in the opening edge vicinity of a 1st recessed part.

  A plurality of the first recesses may be formed side by side with an interval in the extending direction of the electric wire in a state where the barrel is crimped to the core wire.

  According to said structure, the perimeter of the opening edge of a 1st recessed part increases. Thereby, since the area which a core wire and the opening edge of a 1st recessed part slidably contact increases, the electrical resistance of an electric wire and a terminal metal fitting can be reduced.

  The bottom plate may include a contact surface that contacts the core wire, and a second recess may be formed on the contact surface of the bottom plate.

  According to the above configuration, the oxide film formed on the surface of the core wire is in sliding contact with the opening edge of the second recess, whereby the oxide film of the core wire is peeled off and the new surface is exposed. Thereby, since the area of the new surface exposed from a core wire increases, the electrical resistance between an electric wire and a terminal metal fitting can be made still smaller.

  A plurality of the second recesses may be formed side by side with an interval in the extending direction of the electric wire in a state where the barrel is crimped to the core wire.

  According to said structure, the perimeter of the opening edge of a 2nd recessed part increases. Thereby, since the area which a core wire and the opening edge of a 2nd recessed part slidably contact increases, the electrical resistance of an electric wire and a terminal metal fitting can be reduced.

  The first recess may be formed extending from a position near the bottom plate in the barrel.

  According to said structure, in the area | region between the opening edge of the 1st recessed part located near a baseplate, and the opening edge of the 2nd recessed part formed in the baseplate, it becomes easy to concentrate stress comparatively. . As a result, in a region between the opening edge of the first recess located near the bottom plate and the opening edge of the second recess formed in the bottom plate, the barrel is bent relatively easily, and the barrel rises from the bottom plate. It can be configured.

  The core wire may be made of aluminum or an aluminum alloy.

  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. The above configuration is effective when an oxide film is easily formed on the surface of the core wire.

  According to the present invention, it is possible to suppress the buckling of the barrel.

  An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the present embodiment is an electric wire with terminal fitting 10 in which a female terminal fitting (corresponding to the terminal fitting of the present invention) 12 is crimped to a core wire 13 exposed from the end of the electric wire 11.

(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. As the metal thin wire, any metal such as copper, copper alloy, aluminum, or aluminum alloy can be used as necessary. 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)
As shown in FIG. 2, the female terminal fitting 12 is formed by pressing a metal plate material into a predetermined shape using a mold (not shown). The female terminal fitting 12 includes an insulation barrel that is caulked so as to embrace the outer periphery of the insulation coating 14 of the electric wire 11, a bottom plate 30 on which the core wire 13 is placed (arranged) continuously to the insulation barrel 15, and the bottom plate A wire barrel 16 (corresponding to the barrel of the present invention) that is compressed from the core wire 13 by compressing the core wire 13 so as to stand up from both sides of the wire 30 and wind around the core wire 13 from the outside, and the bottom plate 30 are not shown. And a connection portion 17 connected to a male terminal fitting (corresponding to the mating terminal fitting of the present invention). As shown in FIG. 3, the insulation barrel 15 has a pair of plate shapes protruding in the vertical direction in FIG. 2.

  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 baseplate 30 in the expansion | deployment state (state before crimping to an electric wire) and the wire barrel 16 is shown. As shown in FIG. 3, the wire barrel 16 is formed so as to protrude from the bottom plate 30 in the vertical direction in FIG. 3, and forms a pair of plates. The wire barrel 16 has a substantially rectangular shape when viewed from the direction penetrating the paper surface in FIG. 3 in a state before the electric wire is crimped.

  As shown in FIG. 4, the wire barrel 16 is bent so as to rise upward from both side portions (left and right side portions in FIG. 4) of the bottom plate 30. Furthermore, the wire barrel 16 is crimped so as to be wound around the core wire 13 from both sides in the left-right direction in FIG. The ends of the pair of wire barrels 16, 16 are in contact with each other in the vicinity of the center in the left-right direction in FIG. 4 of the female terminal fitting 12, and face downward in FIG. 4. Both ends of the wire barrel 16 are in contact with the core wire 13 from the outside in the radial direction of the core wire 13 (upward in FIG. 3). Of the bottom plate 30 and the wire barrel 16, the surface that contacts the core wire 13 is a contact surface 27.

(Second recess 31)
As shown in FIG. 3, a plurality of second recesses 31 are formed on the contact surface 27 of the bottom plate 13 (the surface on the near side in the direction passing through the paper surface in FIG. 3). The opening edge 32 of each second recess 31 has a quadrangular shape (polygonal shape) when viewed from the direction penetrating the paper surface of FIG. 3 before the electric wire 11 is crimped. In FIG. 3, the internal structure of the second recess 31 is omitted.

  As shown in FIG. 3, the plurality of second recesses 31 are linearly spaced with respect to the extending direction (direction indicated by the arrow A in FIG. 3) in which the wire barrel 16 is crimped to the core wire 13. They are arranged in a line. In the present embodiment, the second recesses 31 are arranged side by side with a constant interval L in the extending direction.

  In addition, the second recess 31 intersects with the above-described extending direction (the direction indicated by the arrow A in FIG. 3) before the wire barrel 16 is crimped to the core wire (the arrow in FIG. 3). (Direction indicated by B) are arranged side by side at intervals. In the present embodiment, the second recesses 31 are arranged side by side with a certain interval in the direction intersecting with the extending direction.

(First recess 18)
As shown in FIG. 3, a plurality of first recesses 18 are formed on the contact surface 27 of each wire barrel 16 (the surface on the near side in the direction of passing through the paper surface in FIG. 3). The opening edge 19 of each first recess 18 has a quadrangular shape (polygonal shape) when viewed from the direction penetrating the paper surface of FIG. 3 before the electric wire 11 is crimped. More specifically, the crossing direction (the direction indicated by the arrow B in FIG. 3) has an elongated rectangular shape. In FIG. 3, the internal structure of the first recess 18 is omitted.

  As shown in FIG. 3, the plurality of first recesses 18 are arranged in a line on the contact surface 27 of each wire barrel 16 with an interval in the extending direction (direction indicated by arrow A in FIG. 3). ing. In the present embodiment, the first recesses 18 are arranged side by side with a constant interval L in the extending direction. In the present embodiment, the interval L between the second recesses 31 and the interval L between the first recesses 18 in the extending direction are set to the same value.

  As shown in FIG. 4, the pair of wire barrels 16 and 16 are crimped so as to be wound around the outside of the core wire 13. In this state, the wire barrel 16 compresses the core wire 13 from the outside. Each first recess 18 continuously extends along the circumferential direction of the core wire 13 in a state where the wire barrel 16 is crimped to the core wire 13 from a position near the bottom plate 30 to a position near the end of the wire barrel 16. ing. In addition, in FIG. 4, the cross section of the some core wire 13 is typically described as a whole.

  As shown in FIG. 4, in a state where the wire barrel 16 is crimped to the core wire 13, the core wire 13 enters the second recess 31 and the first recess 18.

  Next, an example of a process for attaching the female terminal fitting 12 to the electric wire 11 is shown. First, a metal plate is formed into a predetermined shape by press molding using a mold. At this time, the second recess 31 and the first recess 18 may be formed 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 second recess 31 and the first recess 18 may be formed. Moreover, you may form the 2nd recessed part 31 and the 1st recessed part 18 in another process. Moreover, the 2nd recessed part 31 and the 1st recessed part 18 may be formed in the same process, and may be formed in another process.

  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 bottom plate 30 and the insulating coating 14 placed on the insulation barrel 15, the insulation barrel 15 and the wire barrel 16 are connected to the electric wire 11 by a mold (not shown). Caulking from the outside. Thereby, the electric wire 111 and the female terminal fitting 12 are connected, and the electric wire 10 with a terminal fitting is completed.

  Then, the effect | action and effect of this embodiment are demonstrated. According to this embodiment, as shown in FIG. 4, when the wire barrel 16 is caulked to the core wire 13, the core wire 13 is pressed against the wire barrel 16 and compressed. As a result, the core wire 13 enters the second recess 31 and the first recess 18. As a result, the outer peripheral surface of the core wire 13 comes into sliding contact with the opening edge 32 of the second recess 31 and the edge formed on the opening edge 19 of the first recess 18. Then, 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. The core wire 13 and the female terminal fitting 12 are electrically connected when the new surface comes into contact with the wire barrel 16 and the bottom plate 30.

  According to the present embodiment, the first recess 18 has a circumferential direction of the core wire 13 in a state where the wire barrel 16 is crimped to the core wire 13 from at least a position near the bottom plate 30 to a position near the end of the wire barrel 16. Are formed so as to extend continuously. Thereby, the area | region where recessed parts adjoin with respect to the circumferential direction of the core wire 13 is not formed in the wire barrel 16 from the position near the bottom plate 30 to the position near the edge part of the wire barrel 16 at least. As a result, in the region between the position near the bottom plate 30 and the position near the end of the wire barrel 16 in the wire barrel 16, a region where stress is concentrated is not formed, so that the wire barrel 16 may buckle. It is suppressed.

  A relatively large force is required to buckle the end of the wire barrel 16. In the present embodiment, an opening edge 19 of the first recess 18 where stress is likely to concentrate is arranged at a position near the end of the wire barrel 16. Thereby, buckling of the wire barrel 16 in the vicinity of the opening edge 19 of the first recess 18 can be suppressed.

  Moreover, in this embodiment, the 1st recessed part 18 is extended and formed from the position near the baseplate 30 among the wire barrels 16. As a result, in the region between the opening edge 19 of the first recess 18 located closer to the bottom plate 30 and the opening edge 32 of the second recess 31 formed in the bottom plate 30, stress is relatively easily concentrated. ing. Thereby, the wire barrel 16 is bent and formed relatively easily in a region between the opening edge 19 of the first recess 18 located near the bottom plate 30 and the opening edge 32 of the second recess 31 formed in the bottom plate 30. Thus, the wire barrel 16 can rise from the bottom plate 30.

  Moreover, in this embodiment, the 1st recessed part 18 is formed in multiple numbers at intervals in the direction where the electric wire 11 is extended in the state by which the wire barrel 16 was crimped | bonded to the core wire 13. As shown in FIG. Thereby, the perimeter of the opening edge 19 of the 1st recessed part 18 increases. As a result, the area in which the core wire 13 and the opening edge 19 of the first recess 18 are in sliding contact increases, so that the electrical resistance between the electric wire 11 and the female terminal fitting 12 can be reduced.

  Furthermore, in the present embodiment, the second recess 31 is formed in the bottom plate 30. Thereby, compared with the case where only the 1st recessed part 18 is formed, the electrical resistance between the electric wire 11 and the female terminal metal fitting 12 can be made still smaller.

  In addition, a plurality of second recesses 31 are formed side by side with an interval in the direction in which the wire extends in a state where the wire barrel 16 is crimped to the core wire 13. Thereby, the peripheral length of the opening edge 32 of the 2nd recessed part 31 increases. As a result, the area in which the core wire 13 and the opening edge 32 of the second recess 31 are in sliding contact increases, so that the electrical resistance between the electric wire 11 and the female terminal fitting 12 can be further reduced.

  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. This embodiment is effective when an oxide film is easily formed on the surface of the core wire 13.

<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) The first recess 18 may be formed up to the end of the wire barrel 16.
(2) The first recess 18 may be formed from the boundary between the wire barrel 16 and the bottom plate 30.
(3) The 1st recessed part 18 is good also as a structure formed in each wire barrel 16 and 16 one each.
(4) The 1st recessed part 18 is good also as a structure arrange | positioned along with the arbitrary space | intervals about the direction where the electric wire 11 is extended.
(5) One second recess 31 may be formed on the bottom plate 30 or may be omitted.
(6) The 2nd recessed part 31 is good also as a structure arrange | positioned along with the arbitrary space | intervals about the direction where the electric wire 11 is extended. Moreover, the 2nd recessed part 31 is good also as a structure arrange | positioned in zigzag form about the direction where the electric wire 11 is extended, and can be distribute | arranged to the arbitrary positions of the baseplate 30 as needed.
(7) In the present embodiment, the opening edge 32 of the second recess 31 has a rectangular shape, but the opening edge 32 of the second recess 31 has a trapezoidal shape, a parallelogram shape, a rhombus shape, a rectangular shape, and a square shape. It may be an arbitrary quadrangular shape such as a circular shape, an arbitrary polygonal shape such as a triangular shape or a pentagonal shape, or an arbitrary circular shape, an oval shape, a star shape, a cross shape, etc. Can take shape.

The side view which shows the electric wire with a terminal metal fitting which concerns on one Embodiment of this invention Overall perspective view showing terminal fittings Main part enlarged plan view showing terminal fittings IV-IV line sectional view in FIG. An enlarged cross-sectional view of the main part of an electric wire with terminal fittings related to virtual technology

Explanation of symbols

10 ... Electric wire with terminal fitting 11 ... Electric wire 12 ... Female terminal fitting (terminal fitting)
13 ... Core 16 ... Wire barrel (barrel)
DESCRIPTION OF SYMBOLS 17 ... Connection part 18 ... 1st recessed part 27 ... Contact surface 30 ... Bottom plate 31 ... 2nd recessed part

Claims (8)

A bottom plate on which the core wire exposed from the end of the electric wire is placed, a pair of barrels that rise from both sides of the bottom plate and are crimped so as to wrap around the core wire, and extends from the bottom plate and is connected to the mating terminal. The connecting portion, a contact surface formed on the barrel and in contact with the core wire, and formed on the contact surface of the barrel, at least from a position near the bottom plate to a position near the end of the barrel. And a first recess that continuously extends along a circumferential direction of the core wire in a state where is crimped to the core wire. The terminal fitting according to claim 1, wherein the first recess is formed to reach a position near an end of the barrel. 3. The terminal fitting according to claim 1, wherein a plurality of the first recesses are formed side by side with an interval in the extending direction of the electric wire in a state where the barrel is crimped to the core wire. 4. The terminal fitting according to claim 1, wherein the bottom plate includes a contact surface that contacts the core wire, and a second recess is formed in the contact surface of the bottom plate. 5. 5. The terminal according to claim 1, wherein a plurality of the second recesses are formed side by side with an interval in the extending direction of the electric wire in a state where the barrel is crimped to the core wire. Hardware. The terminal fitting according to claim 4 or 5, wherein the first recess is formed to extend from a position near the bottom plate in the barrel. The electric wire with a terminal metal fitting provided with the electric wire containing a core wire, and the terminal metal fitting as described in any one of Claim 1 thru | or 6 crimped | bonded to the terminal of the said electric wire. The electric wire with terminal fitting according to claim 7, wherein the core wire is made of aluminum or an aluminum alloy.

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