JP5590389B2 - Terminal fitting and method of manufacturing terminal fitting - Google Patents

Description

  The present invention relates to a terminal fitting and a method for manufacturing the terminal fitting.

  The electric wire for automobiles has a role of connecting between in-vehicle electronic devices via the terminal fittings connected to both ends thereof, and the insulating coating is peeled off at the ends of the electric wires connected to the terminal fittings. The core wire is exposed. A core wire barrel provided on the terminal fitting is crimped and mechanically and electrically connected to the exposed portion of the core wire of the electric wire, and the portion covered with the insulating coating of the electric wire is provided on the terminal fitting. The insulating coating barrel is pressed and mechanically connected (see, for example, Patent Document 1).

  A waterproof connector is used for connection with equipment arranged in an engine room (outdoor) of an automobile in order to prevent water or the like from adhering to a connection portion between an electric wire and a terminal fitting. On the other hand, in equipment mounted in the interior of an automobile, there is little opportunity for liquids such as water to adhere to it, and therefore, a non-waterproof connector is usually used for connection to the indoor equipment. Therefore, for example, when a car is used in a place exposed to sea breezes, salt water is generated by combining dew generated due to temperature differences between the inside and outside of the car and the salinity contained in the sea breezes. There is a possibility of intrusion into the connection part with the electric wire routed in.

JP-A-2005-50736

  By the way, as an electric wire routed indoors, in recent years, from the viewpoint of reducing the weight of a vehicle, the demand for an aluminum electric wire in which a core wire made of aluminum or aluminum alloy is covered with an insulating coating is increasing. As a terminal metal fitting connected to an aluminum electric wire, it is common to use the thing made from a brass or a copper alloy by the problem on intensity | strength etc.

  Therefore, in the part where the core wire of the electric wire and the terminal fitting are in contact with each other, different metals such as aluminum and copper come into contact. In such a case, when salt water enters the portion where the core wire of the electric wire and the terminal metal fitting are in contact with each other as exemplified above, the contact portion is immersed in an electrolyte solution (salt water) and is electrochemical. There is a possibility that so-called electrolytic corrosion, in which aluminum which is a metal having a large ionization tendency is dissolved by the reaction, proceeds.

  This invention is completed based on the above situations, Comprising: It aims at providing the terminal metal fitting which can prevent generation | occurrence | production of electrolytic corrosion.

In order to solve the above-mentioned problems, the present invention is a terminal fitting provided with a wire connecting portion for placing and electrically connecting an electric wire, wherein the electric wire is different from a metal material constituting the terminal fitting. A core wire made of a metal material is covered with an insulating coating, and the wire connection portion is provided with a core wire barrel piece that is crimped to the core wire exposed from the end of the wire, and the wire of the wire connection portion is mounted thereon. Of the wire placement surface to be placed, a region excluding a connection region electrically connected to the wire of the core wire barrel piece is covered with a first insulating layer made of an insulating material, and further, the wire connection portion The surface opposite to the electric wire mounting surface is covered with a second insulating layer made of an insulating material, and the insulating material is polyethylene terephthalate .

In this invention, the area | region except the connection area | region where the core wire of an electric wire is crimped | bonded and electrically connected among the electric wire mounting surfaces of the electric wire connection part of a terminal metal fitting is covered with the 1st insulating layer. Thus, the portion of the terminal fitting that can be in direct contact with the core wire of the electric wire by covering the electric wire placement surface on the side where the electric wire is placed and connected with a layer made of an insulating material. Is protected, so that the occurrence of electrolytic corrosion can be prevented.
However, water containing electrolytes such as salt may adhere to the surface on the opposite side of the wire mounting surface, and there is a possibility that electrolytic corrosion due to such moisture may occur. By simply covering a predetermined area on the electric wire placement surface side with an insulating material, it is not possible to sufficiently prevent electrolytic corrosion caused by water adhering to the surface opposite to the electric wire placement surface. Therefore, in the present invention, not only the predetermined region on the wire placement surface side of the wire connection portion of the terminal fitting, but also the surface on the opposite side of the wire placement surface of the wire connection portion is the second insulating layer made of an insulating material. It was set as the structure covered with.
Therefore, in the present invention, the electric wire connection portion is covered with a layer made of an insulating material (the first insulating layer and the second insulating layer), except for the connection region, so that electric corrosion hardly occurs. According to the present invention, electrolytic corrosion can be prevented.

The insulating material is polyethylene terephthalate. Since the insulating layer made of polyethylene terephthalate hardly generates pinholes , it is possible to reliably prevent electrolytic corrosion.
The terminal fitting of the present invention may have the following configuration.

In the above configuration, the end face of the electric wire connection portion may be plated with a metal whose ionization tendency is closer to the metal material constituting the core wire than the metal material constituting the electric wire connection portion.
When the terminal metal fitting of the present invention is produced by, for example, forming a first insulating layer and a second insulating layer in a predetermined region of a metal plate constituting the terminal metal fitting and then punching and assembling the metal plate, it is formed by a punching process. Since the end face is not covered with an insulating material, there is a concern that moisture adheres to the end face or generation of electrolytic corrosion due to contact between the end face and the core wire of the electric wire.
Therefore, with the configuration as described above, since the ionization tendency is plated on the end surface of the wire connection portion by a metal close to the metal material constituting the core wire, the ionization tendency between the end surface of the wire connection portion and the core wire is reduced. The difference (potential difference) becomes small, which makes it difficult for electrolytic corrosion to occur, and suppresses the speed of electrolytic corrosion. As a result, according to the present invention, electrolytic corrosion can be reliably prevented.

  In the above configuration, the material constituting the core wire is a metal containing aluminum, while the wire connecting portion is made of a metal containing copper, and the end surface of the wire connecting portion is tin-plated. Also good. With such a configuration, it is possible to reduce the weight of the electric wire, to make the terminal fitting excellent in strength, and to reduce the contact resistance between the terminals by tin plating. Moreover, since the difference in ionization tendency is small between tin and aluminum, the speed of electrolytic corrosion is suppressed.

  Moreover, as what solves the said subject, this invention is equipped with the electric wire connection part which mounts and connects the electric wire formed by coat | covering a core wire with an insulating film, and exposed to the said electric wire connection part from the terminal of the said electric wire. A method of manufacturing a terminal fitting provided with a core wire barrel piece that is crimped and electrically connected to the core wire, and is made of a material different from the core wire, and is formed on one surface of a metal plate that constitutes the terminal fitting. Of the portion corresponding to the wire connecting portion, the first insulating layer made of an insulating material is formed in a portion other than the portion corresponding to the connecting region connected to the wire of the core barrel piece, and the plate member A punching step of punching the plate material on which the first insulating layer and the second insulating layer are formed into a predetermined shape after forming a second insulating layer made of an insulating material on a portion corresponding to the wire connecting portion on the other surface Run and hit The plate after performing the can process, ionization tendency than the metal material constituting the plate material, characterized in place to perform the plating step of plating a metal similar to that of a metal material constituting the core wire.

In the terminal fitting obtained by the manufacturing method of the present invention, a layer made of an insulating material in a region excluding the connection region where the core wire of the electric wire is crimped and electrically connected among the electric wire placement surfaces of the electric wire connection portion ( In addition to forming the first insulating layer, a layer made of an insulating material (second insulating layer) is also formed on the surface of the wire connecting portion opposite to the wire placement surface.
Therefore, in the terminal metal fitting obtained by the manufacturing method of the present invention, most of the electric wire connecting portion is covered with the layers made of an insulating material (first insulating layer and second insulating layer), and therefore it is difficult for electrolytic corrosion to occur.

  In particular, in the manufacturing method of the present invention, after performing the punching process, the ionization tendency is to plate the plate material using a metal close to the metal material constituting the core wire, so the ionization tendency between the end surface of the terminal metal and the core wire This reduces the difference between them, which makes it difficult for electric corrosion to occur and slows the speed of electric corrosion. As a result, according to the present invention, electrolytic corrosion can be reliably prevented.

Further, in the manufacturing method of the present invention, since the punching process is performed after forming the first insulating layer and the second insulating layer, it is not necessary to form each insulating layer in accordance with each terminal fitting. As a result, according to the present invention, the terminal fitting can be produced by a simple method.
Furthermore, in the manufacturing method of the present invention, since the plating step is performed after the first insulating layer and the second insulating layer are formed, compared to the case where the layer made of an insulating material is formed after the plating step is performed. The plate material constituting the terminal metal and the layer made of an insulating material can be easily bonded, and the workability is excellent.

The manufacturing method of the present invention may have the following configuration.
You may perform the said plating process with respect to the end surface of the board | plate material after performing the said punching process.
Since the end surface formed by the punching process is not covered with a layer made of an insulating material, there is a concern that moisture adheres to the end surface or generation of electrolytic corrosion due to contact between the end surface and the core of the electric wire. Therefore, with the configuration as described above, because the metal material constituting the core wire is plated with a metal that is close to ionization tendency on the end surface of the plate material, the difference in ionization tendency between the end surface and the core wire is reduced, and the end surface Electric corrosion is less likely to occur, and the speed of electric corrosion is suppressed.

  The insulating material may be a film made of polyethylene terephthalate. With such a configuration, since polyethylene terephthalate is a material that does not easily generate pinholes, it is possible to reliably prevent galvanic corrosion and to paste the first insulating layer and the second insulating layer on a predetermined region of the plate material. Since a layer can be formed, workability is excellent.

While the material constituting the core wire is a metal containing aluminum, the metal material constituting the plate material may be made of a metal containing copper, and tin plating may be performed on the plate material in the plating step.
With such a configuration, it is possible to reduce the weight of the electric wire, to make the terminal fitting excellent in strength, and to reduce the contact resistance between the terminals by tin plating. Moreover, since tin and aluminum have a close ionization tendency, the speed of electrolytic corrosion is suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the terminal metal fitting which can prevent generation | occurrence | production of electrolytic corrosion can be provided.

Side view of terminal fitting of embodiment 1 Partial plan view showing the wire connection part of the terminal fitting Plan view showing a part of a punched plate Back view of FIG. 3 is an enlarged view of the main part of FIG. A plan view showing a part of a terminal fitting with an electric wire placed thereon The partial top view which shows the state which formed the 1st insulating layer in the predetermined area | region of a board | plate material FIG. 8 is a rear view of FIG. 7 and is a partial rear view showing a state in which a second insulating layer is formed in a predetermined region of the plate material.

<Embodiment 1>
A terminal fitting 10 of Embodiment 1 embodying the present invention will be described with reference to FIGS. In the following description, the left side in FIGS. 1 and 2 is the front, and the upper side in FIGS. 3 to 8 is the front.
The terminal metal fitting 10 of this embodiment is the female terminal metal fitting 10 shown in FIGS. 1 and 2, and is made of a metal material obtained by tin plating a copper or copper alloy metal plate. The terminal fitting 10 of this embodiment is formed into a shape as shown in FIG. 1 by bending the terminal fitting piece 10A having a developed shape as shown in FIG.

  The terminal fitting 10 includes a main body portion 11 having a substantially box shape that opens forward and backward, and a tab (not shown) of a mating male terminal fitting can be inserted into the main body portion 11 from the front. Yes. On the rear side of the main body portion 11 of the terminal fitting 10, an electric wire connecting portion 23 for placing and connecting the electric wires 40 is provided (details will be described later).

  The main body 11 of the terminal fitting 10 is formed in a rectangular tube shape by bending the developed terminal fitting piece 10A shown in FIG. 3 along the folding line L1. The main body 11 includes a bottom wall 13 extending forward and backward, a pair of side walls 14 and 15 raised from both side edges of the bottom wall 13, a ceiling wall 16 that continues from the side wall 14 and faces the bottom wall 13, and a side wall 15. And an outer wall 17 that overlaps the outside of the ceiling wall 16. A support piece 18 projecting toward the side wall 15 is provided at the side edge of the ceiling wall 16, and the support piece 18 is inserted into an insertion groove 19 formed in a cutout in the outer wall 17 and at the side of the insertion groove 19. By contacting the edge (the upper end surface of the side wall 15), the ceiling wall 16 can be supported in a posture substantially parallel to the bottom wall 13.

  An elastic contact piece 20 that can elastically contact the tab is provided from the front end of the bottom wall 13. Although details of the structure of the elastic contact piece 20 are not shown, after the tongue piece 20A extending straight forward from the bottom wall 13 in the unfolded state shown in FIG. The main body 11 is formed by folding forward at a substantially central position in the length direction. A portion between the front and rear folded portions of the elastic contact piece 20 is a tab contact portion 20a that is opposed to the ceiling wall 16 and can be directly contacted with the tab. The portion protruding to the bottom is a support portion 20b that can come into contact with the bottom wall 13, and the tip portion 20c is bent upward in FIG. The elastic contact piece 20 can hold the tab inserted into the main body 11 in a state of being pinched between the ceiling wall 16 and the tab contact portion 20a, and is elastically deformed by being pressed by the tab. At this time, the elastic contact piece 20 is excessively bent by the support portion 20b being in contact with the bottom wall 13 and the tip portion 20c of the support portion 20b being in contact with the back side of the tab contact portion 20a. Can be regulated. The elastic contact piece 20 is formed to be narrower than the bottom wall 13. A locking hole 21 is formed in the bottom wall 13 so that when the terminal fitting 10 is accommodated in a cavity of a housing (not shown), a lance provided in the cavity enters and can be locked. Yes. A pair of stabilizers 22 functioning as guides for the insertion operation into the cavities and the like protrude from both side edges of the locking holes 21 (lower ends of the side walls 14 and 15).

  The wire connection part 23 of the terminal fitting 10 is provided to extend rearward from the rear end of the bottom wall 13 of the main body part 11. In the electric wire connection portion 23, two sets of barrel pieces 24 and 25 are provided at intervals from each other so as to extend from the bottom wall 13 of the main body portion 11 and extend in the width direction of the bottom wall 13. The two sets of barrel pieces 24 and 25 are formed so as to project symmetrically in the width direction.

  The electric wire 40 arranged in the electric wire connecting portion 23 is made of an insulating core wire 41 formed by twisting metal fine wires made of a metal different from the material of the terminal fitting 10 (for example, a metal fine wire made of aluminum or aluminum alloy). It is coated with an insulating coating 42 made of a material. The terminal 40A of the electric wire 40 is in a state where the insulating coating 42 is peeled off and the core wire 41 is exposed. The electric wire 40 is connected to the terminal fitting 10 with the terminal 41A of the exposed core wire 41 facing the main body 11 side.

Of the two barrel pieces 24 and 25 of the wire connection portion 23, the barrel piece 25 on the front side (main body portion 11 side) is a core wire barrel piece 25 that crimps the exposed core wire 41 and connects it to the terminal fitting 10. The barrel piece 24 on the side (rear end side) is an insulating coating barrel piece 24 that is crimped to a portion covered with the insulating coating 42 of the electric wire 40 and connected to the terminal fitting 10.
On the surface 23A on which the electric wire 40 of the core wire barrel piece 25 is placed (the electric wire placing surface 23A, the surface arranged on the upper side in FIG. 1), the oxidation formed around the core wire 41 when the electric wire 40 is crimped. A plurality of recesses 28 for breaking the film are provided (see FIGS. 3, 5 and 6). The region 25A where the plurality of recesses 28 are provided is a connection region 25A where the electric wire 40 and the core wire barrel piece 25 are electrically connected.

  The hole edges of the recesses 28 have a parallelogram shape when viewed from the direction penetrating the paper surface of FIG. The plurality of recesses 28 are arranged at intervals in the direction in which the core wire 41 extends in a state where the core wire barrel piece 25 is crimped to the core wire 41 and at intervals in the direction intersecting the direction in which the core wire 41 extends. (See FIG. 6).

  An area 26 between the core wire barrel piece 25 and the rear end of the main body 11 is an end arrangement area 26 in which an end 40A (terminal 40A) of the electric wire 40 is arranged, and the end arrangement area 26 is an electric wire. In a state where 40 is connected, a part (upper side in FIG. 1) is in an open state, and the core wire 41 is arranged in an exposed state (a state visible from the outside) (see FIGS. 1 and 2). A plate thickness direction surface 26 </ b> A (corresponding to the end surface 23 </ b> C of the terminal fitting) disposed on the upper side in FIG. 1 of the end portion arrangement region 26 is subjected to tin plating.

  A region 27 between the core wire barrel piece 25 and the insulating coating barrel piece 24 is a core wire arrangement region 27 in which the terminal 42A of the insulating coating 42 and the core wire 41 exposed from the terminal 42A of the insulating coating are arranged, and the end portion is arranged. Similarly to the region 26, a part (the upper side in FIG. 1) is in an open state in a state where the electric wire 40 is connected, and the core wire 41 is arranged in an exposed state (a state visible from the outside) (FIG. 1). And see FIG. A plate 27A (corresponding to the end face 23C of the terminal fitting) 27A in the thickness direction disposed on the upper side in FIG.

  Now, as shown in FIGS. 7 and 8, the wire placement surface 23 </ b> A (surface on the side depicted in FIGS. 3 and 5 to 7) of the wire connection portion 23 of the terminal fitting 10 of the present embodiment is as follows. Except for the connection region 25A of the core barrel piece 25, it is covered with a first insulating layer 29A made of an insulating material. Specifically, in the electric wire placement surface 23 </ b> A, the region from the front end 23 </ b> E of the electric wire connection portion 23 to the front side edge portion 25 </ b> B of the core wire barrel piece 25 and the rear side edge portion 25 </ b> C of the core wire barrel piece 25. A region reaching the rear end 23F is covered with the first insulating layer 29A.

  On the other hand, for the surface 23B on the opposite side of the wire placement surface 23A (the surface on the side depicted in FIGS. 4 and 8), the almost entire region of the wire connection portion 23 is the second insulating layer 29B made of an insulating material. Covered with. Note that the portions covered with the first insulating layer 29A and the second insulating layer 29B are indicated by hatching in the drawing.

  In the present embodiment, the insulating material constituting the first insulating layer 29A and the second insulating layer 29B is polyethylene terephthalate (PET).

Next, an example of the manufacturing method of the terminal metal fitting 10 of this embodiment is demonstrated.
First, a PBT film is used as the insulating film 29, the insulating film 29 is attached to a predetermined region of the plate 1 made of a metal material (for example, a copper metal plate), and the first insulating layer 29A and the second insulating layer 29B. (See FIGS. 7 and 8).
Specifically, on one surface 1A of the plate 1 (the surface on the side depicted in FIG. 7, the surface corresponding to the electric wire placement surface 23A), as shown in FIG. The films 29 and 29 are separated into two regions (a region extending from the front end 23E of the wire connection part 23 to the front edge 25B of the core wire barrel piece 25 and the rear side of the core wire barrel piece 25). The first insulating layer 29 </ b> A is formed by pasting on a portion corresponding to the region from the edge portion 25 </ b> C to the rear end 23 </ b> E of the wire connection portion.
In addition, since the first insulating layer 29A is not formed in the connection region 25A, the electrical connection between the terminal fitting 10 and the electric wire 40 is not adversely affected.
On the other surface 1B of the plate 1 (the surface on the side depicted in FIG. 8, the surface corresponding to the surface 23B on the opposite side of the wire placement surface), as shown in FIG. The second insulating layer 29 </ b> B is formed by pasting 29 on the portion corresponding to the wire connecting portion 23.

Next, when a punching process for punching the plate 1 along the dotted line shown in FIGS. 7 and 8 is executed, a chain terminal 30 having the shape shown in FIG. 4 is obtained. The dotted lines shown in FIGS. 7 and 8 indicate the shape (predetermined shape) of the chain terminal 30 in which a plurality of terminal metal pieces 10A are connected.
Next, a plurality of recesses 28 are formed by pressing the connection region 25A of the core wire barrel piece 25 on one surface 1A of the plate member 1 using a mold in which a plurality of projections (not shown) are formed to protrude. Then, the chain terminal 30 shown in FIG. 3 is obtained.

  In the chain terminal 30, a plurality of terminal metal pieces 10 </ b> A are connected to the carriers 31 and 35. As shown in FIG. 3, the chain terminal 30 has a plurality of terminal fitting pieces 10 </ b> A in the illustrated horizontal direction, that is, the carriers 31, 35 of the pair of carriers 31, 35 extending in the illustrated horizontal direction. It is set as the structure connected in the state located in a line at substantially equal intervals along the longitudinal direction (extending direction). Each terminal fitting piece 10A has a longitudinal direction in the vertical direction shown in the drawing, that is, a position along the width direction of the chain terminal 30, and each of the front and rear ends is one of the width directions of the carriers 31 and 35, respectively. Connected to the edge.

  The front end portion of the terminal metal piece 10A is connected to the upper carrier 31 in FIG. The distal end portion 20 c of the elastic contact piece 20 formed at the front end portion of the terminal fitting piece 10 </ b> A is formed at a position where it enters the width region of the carrier 31. The connecting portion 32 and the carrier 31 that connect the front end portion of the terminal metal piece 10A are arranged side by side in the illustrated horizontal direction.

  The rear end portion of the terminal metal piece 10A is connected to a connecting portion 36 protruding from the side edge of the lower carrier 35 in FIG. The connecting portion 36 is connected to the center of the rear end width direction of the insulating coating barrel piece 24 in the terminal fitting piece 10A. The terminal metal piece 10A, the connecting portion 36, and the carrier 35 are arranged side by side in the illustrated vertical direction, that is, in the width direction when viewed from the entire chain terminal 30. The carrier 35 is formed with feed holes 33 and 34 that can be engaged with feed claws (not shown) provided in the processing machine for feeding the chain terminal 30. Since the feed holes 33 and 34 have different feed claws depending on the type of processing machine (for example, a press or a crimping machine), the circular feed holes 33 and the square feed holes 34 are formed according to the shape of the feed claws. Two types are provided.

Next, a plating process for plating the chain terminal 30 obtained through the punching process is executed. In the plating step, not only the both surfaces (the surface depicted in FIG. 3 and the surface depicted in FIG. 4) of the chain terminal 30 are plated, but also the surface in the plate thickness direction (end surface) of the chain terminal 30 (terminal fitting 10). 23C) is also plated.
In the plating step, a metal (tin) whose ionization tendency is closer to the metal material (aluminum or aluminum alloy) constituting the core wire 41 than the metal material (copper or copper alloy) constituting the terminal fitting 10 (plate material 1). Plating.
After the plating step, plating layers are formed on both surfaces 1A and 1B and the end surface 23C of the plate 1 constituting the terminal fitting 10.

  Next, by engaging the feed claws with the feed holes 33 and 34 formed in the carriers 31 and 35, the terminal fitting pieces 10A are sequentially sent to the processing machine, and the terminal fitting pieces 10A are bent in the process. Apply. Next, the insulation coating barrel piece 24 and the core wire barrel piece 25 provided in the wire connection portion 23 of each terminal fitting piece 10 </ b> A are crimped to the wire 40 to connect the terminal fitting 10 and the wire 40. Specifically, as shown in FIG. 6, the terminal 40 </ b> A of the core wire 41 of the electric wire 40 is arranged in the end portion arrangement region 26 of the electric wire connection portion 23, and the terminal 42 </ b> A of the insulating coating 42 is arranged in the core wire arrangement region 27. When the core wire barrel piece 25 and the insulating coating barrel piece 24 are respectively crimped to the electric wires 40, the terminal fitting 10 having the shape shown in FIGS. 1 and 2 is obtained.

Next, functions and effects of this embodiment will be described.
In the present embodiment, the first insulating layer 29 </ b> A is an area other than the connection area 25 </ b> A where the core wire 41 of the electric wire is crimped and electrically connected in the electric wire placement surface 23 </ b> A of the electric wire connection portion 23 of the terminal fitting 10. In the surface 23B that is covered and opposite to the electric wire placement surface 23A, almost the entire area of the electric wire connection portion 23 is covered with the second insulating layer 29B.
Therefore, in the present embodiment, since most of the electric wire connection portion 23 except the connection region 25A is covered with the first insulating layer 29A and the second insulating layer 29B, it is difficult for electrolytic corrosion to occur.

  In particular, in the present embodiment, the end surface of the electric wire connection portion 23 (the end surface 23C of the terminal fitting) is plated with a metal (tin) that is close to ionization to the metal material (aluminum or aluminum alloy) constituting the core wire 41. As a result, the difference in ionization tendency between the end face 23C of the wire connecting portion 23 and the core wire 41 is reduced, which makes it difficult for electrolytic corrosion to occur and suppresses the speed of electrolytic corrosion. As a result, according to this embodiment, electrolytic corrosion can be reliably prevented.

In addition, according to the present embodiment, since the insulating material is polyethylene terephthalate (PET), pinholes are hardly generated, and therefore, electrolytic corrosion can be reliably prevented.
Furthermore, in the manufacturing method of the present embodiment, since the PET film 29 is used for forming the first insulating layer 29A and the second insulating layer 29B, the first insulating layer 29A is adhered to the plate 1 in a predetermined region. In addition, the second insulating layer 29B can be formed, and the workability is excellent.

  Moreover, in this embodiment, while the material which comprises the core wire 41 is a metal containing aluminum, the electric wire connection part 23 is comprised from the metal containing copper, and tin plating is carried out to the end surface 23C of the electric wire connection part 23. Therefore, the weight of the electric wire can be reduced, the terminal metal fitting 10 can be excellent in strength, and the contact resistance between the terminals can be reduced by tin plating.

  In this embodiment, since the punching process is performed after the first insulating layer 29A and the second insulating layer 29B are formed, the first insulating layer 29A and the second insulating layer 29B are combined with the individual terminal fittings 10. There is no need to form. As a result, according to this embodiment, it is possible to produce the terminal fitting 10 by a simple method.

  Furthermore, in the present embodiment, since the plating process is performed after the first insulating layer 29A and the second insulating layer 29B are formed, the first insulating layer 29A and the second insulating layer 29B are formed after the plating process is performed. Since the insulating material is easily bonded to the plate material 1 constituting the terminal fitting 10 as compared with the case of forming, the workability is excellent.

<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 first insulating layer and the second insulating layer are formed by adhering a PET film, but the first insulating layer and the second insulating layer are formed of different insulating materials. Alternatively, it may be formed by a method in which a liquid insulating material is applied and heat treatment is performed.

  (2) In the above embodiment, an electric wire provided with a terminal metal fitting (electric wire connecting portion) made of a material obtained by performing tin plating on a copper (alloy) metal plate and provided with an aluminum (alloy) core wire is shown. However, the material of the terminal fitting and the core wire is not limited to this. In short, the effect of the present invention can be obtained as long as the core wire material and the terminal fitting material are different.

  (3) In the said embodiment, although what carried out the tin plating to the electric wire mounting surface of the terminal metal fitting, the surface on the opposite side of an electric wire mounting surface, and the end surface was shown, it is not limited to this. For example, it may be a terminal fitting made of a metal plate that has not been plated, or it may be plated only on the end face of the terminal fitting, or only on the wire mounting surface of the terminal fitting and on the opposite surface. It may be what you did.

(4) In the above embodiment, the connection region of the core barrel piece is formed with a plurality of concave portions having a parallelogram shape. However, the shape of the concave portion may be rectangular.
(5) In the above embodiment, the method of forming the plurality of recesses after the punching process has been described. However, the plurality of recesses may be formed before the punching process or simultaneously with the punching process.

  (6) Although the female terminal is shown as the terminal fitting in the above embodiment, a male terminal may be used. Moreover, although the terminal metal fitting provided with the main-body part which can insert the other party metal fitting was shown in the said embodiment, what has a wire connection part which connects two or more electric wires (what is called a "splice terminal") may be used. .

  (7) Although the manufacturing method which performs a plating process after a punching process was demonstrated in the said embodiment, you may perform a plating process before a punching process. In this case, however, if the end surface of the plate formed by punching is plated after the punching step, the effect of preventing electrolytic corrosion can be ensured.

DESCRIPTION OF SYMBOLS 1 ... Plate material 1A ... One surface (surface equivalent to an electric wire mounting surface) of a plate material
1B ... The other surface of the plate (surface corresponding to the surface opposite to the wire placement surface)
DESCRIPTION OF SYMBOLS 10 ... Terminal metal fitting 23 ... Electric wire connection part 23A ... Electric wire mounting surface 23B ... Surface on the opposite side of electric wire mounting surface 23C ... End surface (of electric wire connection part) 24 ... Insulation coating barrel piece 25 ... Core wire barrel piece 25A ... Connection area 26A ... End surface (of the electric wire connecting portion) 27A ... End surface (of the electric wire connecting portion) 29 ... Insulating material (insulating film)
29A ... 1st insulating layer 29B ... 2nd insulating layer 40 ... Electric wire 40A ... (Electric wire) terminal 41 ... Core wire 41A ... (Core wire) terminal 42 ... Insulating coating

Claims (7)

A terminal fitting provided with an electric wire connecting part for placing and electrically connecting electric wires,
The electric wire is formed by coating a core wire made of a metal material different from the metal material constituting the terminal fitting with an insulating film,
The wire connection part is provided with a core barrel piece to be crimped to the core wire exposed from the end of the wire,
Of the wire placement surface on which the wire of the wire connection portion is placed, a region excluding a connection region electrically connected to the wire of the core wire barrel piece is a first insulating layer made of an insulating material. Covered,
Furthermore, the surface on the opposite side of the wire mounting surface of the wire connecting portion is covered with a second insulating layer made of an insulating material ,
A terminal fitting, wherein the insulating material is polyethylene terephthalate . The end face of the electric wire connection part is plated with a metal that has an ionization tendency closer to the metal material constituting the core wire than the metal material constituting the electric wire connection part. The terminal fitting according to 1. While the material constituting the core wire is a metal containing aluminum, the wire connection portion is made of a metal containing copper, and the end surface of the wire connection portion is tin-plated. The terminal fitting according to claim 2 . A core wire barrel piece comprising an electric wire connecting portion for placing and connecting an electric wire formed by coating a core wire with an insulating coating, and crimping and electrically connecting the core wire exposed from the end of the electric wire to the electric wire connecting portion. A method of manufacturing a terminal fitting provided with
  Corresponding to a connection region connected to the electric wire of the core wire barrel piece among the portions corresponding to the electric wire connecting portion of one surface of the metal plate material made of a material different from the core wire and constituting the terminal fitting. After forming a first insulating layer made of an insulating material in a portion other than the portion to be formed and forming a second insulating layer made of an insulating material in a portion corresponding to the wire connecting portion on the other surface of the plate member Performing a punching step of punching a plate material on which the first insulating layer and the second insulating layer are formed into a predetermined shape;
  A terminal fitting characterized by performing a plating step of plating a metal closer to the metal material constituting the core wire than the metal material constituting the plate material on the plate material after performing the punching step. Manufacturing method. The method of manufacturing a terminal fitting according to claim 4, wherein the plating step is performed on an end face of the plate material after the punching step is performed . 6. The method of manufacturing a terminal fitting according to claim 4, wherein the insulating material is a film made of polyethylene terephthalate . Billing material constituting the core wire while a metal containing aluminum, the metal material constituting the plate member which is made of a metal containing copper, and is characterized by applying tin plating to the plate in the plating step The manufacturing method of the terminal metal fitting as described in any one of Claims 4 thru | or 6 .

Images