JP2013030337A - Wire with terminal and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire with a terminal having a reduced connection resistance, and to provide a manufacturing method therefor.SOLUTION: The wire 10 with a terminal comprises: a wire 11 produced by covering a core wire 12 consisting of a plurality of twisted single wires 14 made of aluminum or an aluminum alloy with an insulation coating 13; and a terminal 20 having a wire connection 30 to which the core wire 12 exposed by stripping the insulation coating 13 is connected, and a terminal connection 21 for connection with the mating terminal. The terminal connection 21 consists of a conductive plate material. The wire connection 30 is provided by inserting the exposed core wire 12 into a cylinder 31 made of a conductive material and then molding it to have a planar shape. The end 30A where the tip 12A of the exposed core wire 12 is located is bonded to the end face 21A of the terminal connection 21.

Description

  The present invention relates to an electric wire with a terminal and a method for manufacturing the same.

  As an electric wire with a terminal comprising a core wire composed of a stranded wire obtained by twisting a plurality of metal strands with an insulating coating, an electric wire from which the core wire is exposed at the terminal, and a terminal connected to the terminal of the electric wire For example, the thing of patent document 1 etc. are known.

  In the electric wire with a terminal described in Patent Document 1, a wire barrel of a terminal is crimped to and electrically connected to a core wire exposed at an end of the electric wire.

Japanese Utility Model Publication No. 5-72053

In the electric wire with a terminal of the type described in Patent Document 1, the terminal and the electric wire are electrically connected when the core wire and the inner surface of the wire barrel come into contact with each other.
Therefore, in this type of electric wire with terminal, when the wire constituting the core wire is thin and has a large number of twists, the wire breakage occurs when the wire barrel is crimped with high compression to reduce the connection resistance. Connection performance may be reduced.

  This invention is completed based on the above situations, Comprising: It aims at providing the electric wire with a terminal which made connection resistance small, and its manufacturing method.

  As a method for solving the above problem, it is conceivable to reduce the connection resistance by directly joining the core wire of the electric wire to the terminal. However, the strands constituting the core wire of the electric wire may vary, and it is difficult to join the core wire directly to the terminal.

As a result of further studies, the present invention has been achieved.
That is, the present invention relates to an electric wire in which a core wire formed by twisting a plurality of strands made of aluminum or an aluminum alloy is covered with an insulating coating, and an exposure exposed by peeling off the insulating coating at the end of the electric wire. An electric wire with a terminal provided with a wire connecting part to which a core wire is connected and a terminal having a terminal connecting part connected to a counterpart terminal, wherein the terminal connecting part is made of a conductive plate material, and the electric wire connection The portion is provided by inserting the exposed core wire into a cylindrical body made of a conductive material and molding it into a plate shape, and the end of the wire connecting portion where the tip of the exposed core wire is disposed is the terminal. It is characterized by being joined to the end face of the connecting portion.

  Further, the present invention provides an electric wire in which a core wire formed by twisting a plurality of strands made of aluminum or aluminum alloy is covered with an insulating coating, and an exposure exposed by peeling off the insulating coating at the end of the electric wire. An electric wire connecting portion to which a core wire is connected and a terminal having a terminal connecting portion to be connected to a counterpart terminal, and a method of manufacturing a terminal-attached electric wire, wherein the exposed core wire is attached to a cylindrical body made of a conductive material. A step of forming the wire connection part by inserting and forming into a plate shape; an end part where the tip of the exposed core wire of the wire connection part is disposed; and an end surface of the terminal connection part made of a conductive plate material; And a joining step for joining the layers.

  In the present invention, the end of the wire connecting portion provided by inserting the exposed core wire into the cylindrical body and forming it into a plate shape is joined to the end surface of the terminal connecting portion. Thus, the core wire and the terminal are connected. Therefore, according to the present invention, since all of the plurality of strands constituting the core wire can be joined to the terminal (terminal connection portion), the connection resistance can be reduced.

  Moreover, in this invention, the plate-shaped electric wire connection part is joined to the end surface of the terminal connection part (terminal) which consists of a board | plate material, and the terminal and the connection part (electric wire connection part) of a terminal and an electric wire are flat form as a whole. This saves space (see FIG. 1).

The present invention may have the following configurations.
The cylinder may be made of aluminum or aluminum alloy.
When the material of the wire constituting the cylindrical body and the core wire is a dissimilar metal, the dissimilar metal comes into contact with the inside of the cylindrical body, so if water containing an electrolyte such as salt enters here, the occurrence of electrolytic corrosion will occur. Concerned. Therefore, with the above configuration, since the cylindrical body and the core wire made of the aluminum or aluminum alloy wire are made of the same metal, corrosion that occurs between dissimilar metals at the contact portion between the cylindrical body and the core wire. Is less likely to occur.

The structure which consists of the same material may be sufficient as the said cylinder and the said terminal connection part.
With such a configuration, since the cylindrical body and the terminal connection portion are made of the same material, corrosion that occurs between different metals at the joint portion between the cylindrical body and the terminal connection portion is less likely to occur. Furthermore, since joining of a cylinder and a terminal connection part can be performed by laser welding, precise joining is possible.

  ADVANTAGE OF THE INVENTION According to this invention, the electric wire with a terminal which made connection resistance small, and its manufacturing method can be provided.

The perspective view of the electric wire with a terminal of Embodiment 1 Schematic diagram schematically showing the cross section of the electric wire with terminal The perspective view which shows a mode that a cylinder is penetrated to an electric wire Perspective view of an electric wire inserted through a cylinder The perspective view which shows a mode that the electric wire of FIG. 4 was arrange | positioned to the shaping die The perspective view which shows a mode that the electric wire connection part of the electric wire of FIG. 4 is produced. The perspective view of the electric wire which passed through the process of producing an electric wire connection part Perspective view of the wire after polishing the end of the wire connection The perspective view which shows a mode that the end surface of the terminal connection part was put together to the edge part of an electric wire connection part

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the electric wire with terminal 10 according to the first embodiment includes an electric wire connecting portion 30 to which the core wire 12 (exposed core wire 12) exposed at the terminal 11 </ b> A of the electric wire 11 and the electric wire 11 is connected, and a counterpart terminal (not shown). And the terminal 20 having the terminal connection portion 21 connected to the terminal 20. In the following description, the vertical direction will be described with reference to FIG. 2, and the front-back direction will be described with the left side of FIG. 2 as the front and the right side as the rear.

  As shown in FIG. 1, the wire 11 is covered with a synthetic resin insulating coating 13 around the core wire 12. As shown in FIG. 3, at the terminal 11 </ b> A of the electric wire 11, the insulating coating 13 is stripped and the core wire 12 is exposed.

  The core wire 12 is a stranded wire in which a large number (plural) of metal strands 14 are twisted together. The metal wire 14 is made of aluminum or aluminum alloy.

  The electric wire 11 has a circular cross section, but a part of the exposed core wire 12 of the terminal 11A portion inserted through the cylindrical body 31 is deformed into a square shape.

  The terminal 20 has a flat plate shape as a whole, and has a terminal connection portion 21 that is connected to a counterpart terminal. The terminal connection portion 21 is provided with a circular terminal connection hole 22 for connecting a counterpart terminal. Examples of the material of the terminal 20 include conductive plate materials such as copper, copper alloy, aluminum, and aluminum alloy, and an appropriate metal material is selected as necessary. In the present embodiment, the terminal 20 is a flat plate having a top view shape made of aluminum or aluminum alloy.

  In addition, the plating layer may be formed in the surface of the metal plate material which comprises the terminal 20 of this embodiment. Examples of the metal constituting the plating layer include tin, nickel, and the like, and are appropriately selected from arbitrary metal materials as necessary.

  Now, in this embodiment, the electric wire connection part 30 has comprised flat form as a whole, and the front end part 30A is joined with the end surface 21A (end surface 21A of the terminal connection part 21) of the terminal 20 which makes flat form. .

  In detail, the electric wire connection part 30 is provided by shape | molding the cylindrical body 31 which can insert the core wire 12 of the electric wire 11 in a flat plate shape in the state which penetrated the exposed core wire 12 of the electric wire 11 inside. . The thickness dimension of the front end 30 </ b> A of the wire connection part 30 is set to be approximately the same as the thickness of the end face 21 </ b> A of the terminal connection part 21. In the cylindrical body 31, a part of the exposed core wire 12 has a rectangular shape, and the front end 12A of the exposed core wire 12 has a front end portion 30A (front end portion of the wire connecting portion 30) of the cylindrical body 31, as shown in FIG. 30A) and joined to the end face 21A of the terminal connecting portion 21.

  Examples of the material of the cylindrical body 31 include conductive materials such as copper, copper alloy, aluminum, and aluminum alloy, and an appropriate metal material is selected as necessary. In the present embodiment, the cylindrical body 31 is made of aluminum or aluminum alloy. In addition, the plating layer may be formed in the surface of the metal material which comprises the cylinder 31 of this embodiment. Examples of the metal constituting the plating layer include tin, nickel, and the like, and are appropriately selected from arbitrary metal materials as necessary.

Next, the manufacturing method of the electric wire 10 with a terminal of this embodiment is demonstrated.
As shown in FIG. 3, a cylindrical tube 31 is prepared, and the insulation coating 13 of the terminal 11 </ b> A of the electric wire 11 is peeled and removed to expose the core wire 12. Next, as shown in FIG. 4, the core wire 12 (exposed core wire 12) exposed at the terminal 11 </ b> A of the electric wire 11 is inserted into the cylindrical body 31.

  The cylindrical body 31 into which the exposed core wire 12 of the electric wire 11 is inserted is molded using the molding die 40 shown in FIGS. At the time of molding, the cylindrical body 31 into which the exposed core wire 12 is inserted is formed between a molding die 42 arranged on the lower side and a molding die 41 arranged on the upper side. The pressure is applied in a state of being sandwiched by 43 (see FIGS. 5 and 6). By pressing the cylinder 31 in which the exposed core wire 12 of the electric wire 11 is inserted, the region 31A including the front end portion 30A of the cylinder 31 is formed into a square shape (the shape of the forming portion 43), and the electric wire as shown in FIG. The electric wire 11 provided with the connection part 30 is obtained.

  Next, the front end portion 30 </ b> A of the electric wire connection portion 30 is polished by an end mill, and is molded so that the tip end 12 </ b> A of the core wire 12 of the electric wire 11 is disposed at the front end portion 30 </ b> A of the electric wire connection portion 30.

  Next, as shown in FIG. 9, the end face 21 </ b> A of the terminal connection portion 21 having a flat plate shape and the circular terminal connection hole 22 is aligned with the front end portion 30 </ b> A of the wire connection portion 30. Next, when the end surface 21A of the terminal connection portion 21 and the front end portion 30A of the wire connection portion 30 are joined, the terminal-attached electric wire 10 having the shape shown in FIG. 1 is obtained.

  Examples of a method for joining the end 30A of the wire connecting portion 30 and the end face 21A of the terminal connecting portion 21 include welding such as laser welding, TIG welding, friction stir welding, brazing, and cold welding. In this embodiment, since the material of the electric wire connection part 30 (cylinder 31) and the material of the terminal 20 are the same metal material, joining by laser welding is possible.

Next, the operation and effect of this embodiment will be described.
In the present embodiment, the end 30A of the exposed wire 12 that is provided by inserting the exposed core 12 through the cylindrical body 31 and forming it into a plate shape, and the terminal connection. The core wire 12 and the terminal 20 are connected by joining the end surface 21 </ b> A of the portion 21. Therefore, according to this embodiment, since all the some strand 14 which comprises the core wire 12 can be joined with the terminal 20 (terminal connection part 21), connection resistance can be made small.

  Moreover, according to this embodiment, the plate-shaped electric wire connection part 30 is joined to the end surface 21A of the terminal connection part 21 (terminal 20) which consists of board | plate materials, and the terminal 20 and the electric wire connection part 30 are shown in FIG. As shown in the figure, a flat plate shape is used as a whole, which saves space.

  In addition, according to the present embodiment, since the cylindrical body 31 is made of aluminum or aluminum alloy, the cylindrical body 31 and the core wire 12 are made of the same metal. Corrosion that occurs between metals is less likely to occur.

  Furthermore, according to the present embodiment, since the cylindrical body 31 and the terminal connection portion 21 are made of the same material, corrosion that occurs between different metals in the joint portion 32 between the cylindrical body 31 and the terminal connection portion 21 is less likely to occur. In addition, since the cylindrical body 31 and the terminal connecting portion 21 can be joined by laser welding, precise joining is possible.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the cylindrical body 31 is made of aluminum or aluminum alloy, but the cylindrical body 31 may be made of copper or copper alloy.
(2) In the above embodiment, the cylindrical body 31 and the terminal connecting portion 21 are made of the same material, but the cylindrical body 31 and the terminal connecting portion 21 may be made of different materials.
(3) In the above embodiment, the method of polishing the front end portion 30A of the wire connecting portion 30 with an end mill has been described, but a polishing machine other than the end mill may be used.

DESCRIPTION OF SYMBOLS 10 ... Electric wire with a terminal 11 ... Electric wire 11A ... Terminal 12 ... Core wire 13 ... Insulation coating 14 ... Elementary wire 20 ... Terminal 21 ... Terminal connection part 21A ... End surface of a terminal connection part 22 ... Terminal connection hole 30 ... Electric wire connection part 30A ... ( End 31 where exposed core wire is disposed) End 31 ... Cylinder 40 ... Molding die 41 ... Upper molding die 42 ... Lower molding die 43 ... Molding part

Claims (6)

An electric wire in which a core wire made of a stranded wire obtained by twisting a plurality of strands made of aluminum or an aluminum alloy is covered with an insulating coating;
An electric wire with a terminal provided with an electric wire connecting portion to which an exposed core wire exposed by peeling of the insulating coating at the end of the electric wire is connected, and a terminal having a terminal connecting portion connected to a counterpart terminal,
The terminal connection portion is made of a conductive plate material,
The electric wire connecting portion is provided by inserting the exposed core wire into a cylindrical body made of a conductive material and forming it into a plate shape, and an end portion of the electric wire connecting portion where the tip of the exposed core wire is disposed is provided. The terminal-attached electric wire is joined to an end face of the terminal connecting portion. The electric wire with a terminal according to claim 1, wherein the cylindrical body is made of aluminum or aluminum alloy. The said cylinder and the said terminal connection part consist of the same material, The electric wire with a terminal of Claim 1 or Claim 2 characterized by the above-mentioned. An electric wire in which a core wire made of a stranded wire obtained by twisting a plurality of strands made of aluminum or an aluminum alloy is covered with an insulating coating;
A method of manufacturing an electric wire with a terminal comprising: an electric wire connecting portion to which an exposed core wire exposed by peeling of the insulating coating is connected at a terminal of the electric wire; and a terminal having a terminal connecting portion connected to a counterpart terminal. And
A step of producing the electric wire connecting portion by inserting the exposed core wire into a cylindrical body made of a conductive material and forming it into a plate shape;
A joining step of joining an end portion of the electric wire connecting portion where the tip of the exposed core wire is disposed and an end face of the terminal connecting portion made of a conductive plate;
The manufacturing method of the electric wire with a terminal characterized by passing through. The manufacturing method of the electric wire with a terminal according to claim 4, wherein the cylindrical body is made of aluminum or aluminum alloy. The method for manufacturing a terminal-attached electric wire according to claim 4 or 5, wherein the cylindrical body and the terminal connection portion are made of the same material.

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