JP2010062099A - Terminal metal fitting, and connecting method of terminal metal fitting to electric wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent generation of bent-up of a terminal metal fitting. <P>SOLUTION: The terminal metal fitting 10 includes a wire barrel 13 crimped to a core wire part 93 exposed by a terminal of an electric wire 90. The wire barrel 13 includes a surface side caulking piece 21 caulked against the core wire part 93 from its surface side, and a backside caulking piece 22 caulked from its backside. A cross-sectional shape orthogonal to the axis direction is formed to have an S-form in an open state before crimping to the core wire part 93. A compressing force accompanying bending movement of the surface side caulking piece 21 and the backside caulking piece 22 is imparted to both the surface side and the backside of the wire barrel 13 uniformly. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a terminal fitting and a method for connecting the terminal fitting to an electric wire.

Patent Document 1 discloses a conventional terminal fitting. This is a board part that extends in the front-rear direction and supports the electric wire, a box-type connection part that is located on the front side of the board part and electrically connected to the mating connection part, and is located on the rear side of the board part And a wire barrel that is crimped to the core wire exposed at the end of the electric wire. The wire barrel has a pair of caulking pieces projecting from the substrate portion to the same side so as to face each other.
JP 2003-217784 A

  When crimping the wire barrel to the core wire, set the wire barrel between the anvil (lower mold) and the crimper (upper mold), and bring the anvil and crimper close to each other. The process of caulking the wire barrel is performed with accompanying the above. However, in this case, the bending operation of both the crimped pieces is performed exclusively on the crimper side, and the compressive force acts on the front surface side facing the crimper side of both sides of the substrate portion, while the tensile force is applied on the back surface side facing the anvil side. Therefore, a vent-up that warps and deforms while the substrate portion extends in the front-rear direction may occur.

  The present invention has been completed based on the above circumstances, and an object thereof is to prevent the occurrence of vent-up of terminal fittings.

  As a means for achieving the above object, the invention of claim 1 is a terminal fitting comprising a wire barrel that is crimped to a core wire exposed at the end of the electric wire, wherein the wire barrel is the core wire. A cross-sectional shape perpendicular to the axial direction is formed in an S-shape in an open state before crimping to the core wire, and a front-side caulking piece that is caulked from the front side and a back-side caulking piece that is caulked from the back side It has the characteristics in the configuration.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the front-side caulking piece and the back-side caulking piece are arranged side by side in a lateral direction perpendicular to the front-back direction of the core wire. .

  The invention of claim 3 is a method for connecting the terminal fitting to the electric wire according to claim 1 or 2, wherein the wire barrel in an open state is arranged between a pair of movable molds facing each other, and then the both It is characterized in that the caulking operations of the front-side caulking piece and the back-side caulking piece with respect to the core wire are advanced almost simultaneously by moving the movable mold and approaching each other.

<Invention of Claim 1>
The wire barrel has a front caulking piece that is caulked from the front side to the core wire and a back caulking piece that is caulked from the back side, and the cross-sectional shape perpendicular to the axial direction is S in an open state before crimping to the core wire. Since it is formed in a letter shape, the compressive force accompanying the bending operation of the front side crimping piece and the back side crimping piece is applied to both the front and back sides, and as a result of avoiding the tensile force acting on the back side, The occurrence of vent-up is prevented.

<Invention of Claim 2>
Since the front side crimping piece and the back side crimping piece are arranged side by side in the horizontal direction perpendicular to the front and back direction of the core wire, compared to the case where they are arranged side by side in the vertical direction parallel to the front and back direction of the core wire, The smoothness of the caulking operation is ensured.

<Invention of Claim 3>
As both movable molds approach, the caulking action of the front side crimping piece and the back side crimping piece with respect to the core wire proceeds almost simultaneously, so an equal compressive force is applied from both movable types to both the front and back sides of the wire barrel. The occurrence of metal fitting vent-up is more reliably prevented.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. The terminal fitting 10 according to the present embodiment is integrally formed by bending a conductive metal plate made of copper or a copper alloy containing a large amount of copper and connected to the terminal of the electric wire 90. The electric wire 90 is composed of a core wire 91 formed by twisting aluminum strands made of aluminum or an aluminum alloy containing a large amount of aluminum, and a resin insulating coating 92 covering the periphery of the core wire 91. A core wire portion 93 is formed at the end of the electric wire 90 and is exposed by peeling off the insulating coating 92.

  As shown in FIG. 1, the terminal fitting 10 includes a strip-like board portion 11 that is elongated in the axial direction (front-rear direction) and a male terminal of a mating terminal fitting (not shown) that is located on the front end side of the board portion 11. A cylindrical main body portion 12 for receiving a tab, a wire barrel 13 that is crimped to a core wire portion 93 located slightly behind the center of the substrate portion 11 and exposed at the end of the electric wire 90, and a rear end of the substrate portion 11 And an insulation barrel 14 which is positioned on the side and is crimped to the insulating coating 92 of the electric wire 90.

  The board part 11 constitutes the bottom part of the main body part 12, the wire barrel 13 and the insulation barrel 14, and its surface is a support surface 15 that supports the electric wire 90 along the front-rear direction. An elastic contact piece (not shown) that can elastically contact the mating terminal fitting is provided in the main body 12.

  The insulation barrel 14 has a pair of crimping pieces 16 protruding from both ends in the width direction of the substrate portion 11. Both the crimping pieces 16 are configured to protrude to the front side of the substrate portion 11. The insulation barrel 14 is formed in a U-shaped cross-section perpendicular to the axial direction in an open state before pressure bonding to the insulating coating 92.

  The wire barrel 13 is caulked from the front side (support surface 15 side) to the core wire portion 93 and caulked from the back side (opposite side of the support surface 15) to the core wire portion 93. The back side crimping piece 22 is provided. The front-side caulking piece 21 and the back-side caulking piece 22 are arranged side by side in the lateral direction orthogonal to the front and back directions by protruding in opposite directions from both ends in the width direction of the substrate part 11 twisted in a direction inclined with respect to the horizontal plane. Thus, it has a substantially point-symmetric shape with the axis center (center in the width direction of the substrate portion 11) as the center. As shown in FIG. 3, the wire barrel 13 has an S-shaped cross section orthogonal to the axial direction in an open state before crimping to the core wire portion 93. Further, as shown in FIG. 2, the wire barrel 13 is substantially circular in the counterclockwise direction in the counterclockwise direction while the front-side caulking piece 21 encloses one half of the core wire portion 93 in the closed state after the crimping to the core wire portion 93. The back side caulking piece 22 is bent in a substantially circular shape in the clockwise direction in the figure while enclosing the other half of the core wire portion 93, so that the cross-sectional shape perpendicular to the axial direction becomes an 8-shaped shape. Is formed.

Next, the effect of the terminal fitting 10 according to the present embodiment will be described.
When crimping the wire barrel 13 to the core wire portion 93, the wire barrel 13 is set between a pair of movable molds 60 arranged in the lateral direction (see FIG. 3), and the front side caulking piece 21 in the open state is front side. The core wire portion 93 is disposed on the back side of the back-side crimped piece 22 in the open state. The inner surfaces of both movable molds 60 are concave curved pressing surfaces 61 having the same shape.

  Subsequently, both movable molds 60 are moved to approach each other, and the wire barrel 13 is caulked between the pressing surfaces 61 of both movable molds 60. At this time, the moving speeds of both movable molds 60 are set to be substantially the same, and the caulking operation of the front side caulking piece 21 and the back side caulking piece 22 is set to proceed almost simultaneously.

  When the wire barrel 13 is normally caulked in this way, the front end of the front side caulking piece 21 is caulked to the surface side of the core wire portion 93 so as to approach the axial center of the wire barrel 13 from the front side, and the front end of the back side caulking piece 22 is The wire barrel 13 is caulked to the back surface side of the core wire portion 93 so as to approach the axial center of the wire barrel 13 from the back side, and the wire barrel 13 has a shape of a section 8 as a whole (see FIG. 2).

  As described above, according to the present embodiment, the wire barrel 13 has the front caulking piece 21 that is caulked from the front side to the core wire portion 93 and the back caulking piece 22 that is caulked from the back side, and the core wire Since the cross-sectional shape orthogonal to the axial direction is formed in an S shape in the open state before crimping to the portion 93, the compressive force accompanying the bending operation of the front side caulking piece 21 and the back side caulking piece 22 is applied to the front and back sides of the wire barrel 13. Unlike the conventional case, the tensile force acting on the back side of the wire barrel 13 is avoided. As a result, the terminal fitting 10 is prevented from being bent up.

  Moreover, since the front side crimping piece 21 and the back side crimping piece 22 are arranged side by side in the horizontal direction orthogonal to the front and back direction of the core wire portion 93, they are arranged side by side in the vertical direction parallel to the front and back direction of the core wire portion 93. Compared with the case where it exists, the smoothness of the caulking operation | movement to the core part 93 is ensured.

  Furthermore, the caulking operation of the front side caulking piece 21 and the back side caulking piece 22 with respect to the core wire portion 93 proceeds almost simultaneously as the two movable molds 60 approach each other. A force is applied, and the occurrence of vent-up of the terminal fitting 10 is more reliably prevented.

<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 wire barrel in the open state may be formed in an S-shaped cross section. For example, the front-side caulking piece and the back-side caulking piece may have different shapes.
(2) The electric wire may be a copper electric wire having a copper element wire made of copper or a copper alloy containing a large amount of copper.
(3) The present invention is also applicable to a male terminal fitting having a male tab and an LA terminal having an annular main body.

It is a top view of the terminal metal fitting concerning Embodiment 1 of the present invention. It is AA sectional drawing of FIG. It is sectional drawing which shows the state which set the wire barrel between a pair of movable mold | types.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Terminal metal fitting 11 ... Board | substrate part 13 ... Wire barrel 21 ... Front side crimping piece 22 ... Back side crimping piece 90 ... Electric wire 92 ... Core wire

Claims (3)

A terminal fitting provided with a wire barrel that is crimped to a core wire exposed at the end of the electric wire,
The wire barrel has a front side crimping piece that is caulked from the front side to the core wire and a back side caulking piece that is caulked from the back side, and a cross section perpendicular to the axial direction in an open state before crimping to the core wire A terminal fitting having an S-shape.   2. The terminal fitting according to claim 1, wherein the front-side caulking piece and the back-side caulking piece are arranged side by side in a lateral direction orthogonal to a front-back direction of the core wire. A method of connecting a terminal fitting according to claim 1 or 2 to an electric wire,
By placing the wire barrel in an open state between a pair of movable molds facing each other, and then moving the movable molds closer to each other, the front-side crimped piece and the back-side crimped piece are crimped to the core wire. A method of manufacturing a terminal metal fitting, wherein the operations are advanced almost simultaneously.

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