JP2012104234A - Wire with terminal fitting, and manufacturing method for wire with terminal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire with a terminal fitting that has excellent waterproofness.SOLUTION: The wire 1 with a terminal fitting comprises a wire 2, a terminal fitting 3, a water proofing wall 4 and a water proofing coating 5. The core wire 21 is exposed from an insulation layer 22 at the terminal part of the wire 2, and the core wire 21 portion is mounted on the bottom plate 31 of the terminal fitting 3 and crimped by a wire barrel 32. A marginal part 36 exists on the distal end side of the core wire 21 and the water proofing wall 4 is formed at that part. The water proofing wall 4 consists of a resin workpiece 41 processed into a prescribed shape and having a surface adhesive to a metal. The resin workpiece 41 is provided to be fitted to the inside of the bottom plate 31 in the marginal part 36. The water proofing coating 5 is cylindrical and the opening end 51 on the distal end side adheres to surround the water proofing wall 4 and the bottom plate 31 at a part for receiving the water proofing wall 4, and the opening end 52 on the rear side adheres to surround the insulation layer 22 at the root of the core wire 21.

Description

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

  Conventionally, the thing of patent document 1 is known as an electric wire with a terminal metal fitting. This electric wire with a terminal fitting includes an electric wire whose outer periphery is coated with an insulating layer, and a terminal fitting connected to the core wire exposed from the insulating layer. The connecting portion of the core wire is crimped (crimped) by a wire barrel provided in the terminal fitting.

  The electric wire with a terminal fitting is used, for example, in an engine room of an automobile. As described in Patent Document 1 and the like, normally, water can enter the engine room, so that there is a possibility that water contacts the connection portion between the terminal fitting and the electric wire. When water contacts the connection portion, the terminal fitting and the core wire made of a metal material are corroded. For example, when metal members different from each other are connected, such as when the terminal fitting is made of copper and the core wire is made of aluminum, corrosion is particularly likely. Therefore, the electric wire with a terminal metal fitting described in Patent Document 1 covers a heat shrinkable tube around the connection portion. By covering the heat-shrinkable tube in this way, water does not soak into the connecting portion of the electric wire with terminal fitting from the periphery thereof.

JP 2000-259883 A

  By the way, water may permeate from the periphery (circumferential direction) of the connection part, or may enter the connection part from the front side of the terminal fitting.

  In the electric wire with terminal fitting described in Patent Document 1, the front side of the heat-shrinkable tube placed on the connection portion is in an open state. Therefore, it is in a state where water can enter from the front side of the heat shrinkable tube, which is a problem.

  This invention is completed based on the above situations, Comprising: It aims at providing the manufacturing method of the electric wire with a terminal metal fitting excellent in waterproofness (waterproofness), and an electric wire with a terminal metal fitting.

  The electric wire with terminal fitting according to the present invention includes a core wire, an electric wire having an insulating layer covering the outer periphery of the core wire so that the end of the core wire is exposed, and a shaft with both edges standing so as to form a groove inside. A bottom plate that extends along the direction and on which the end of the core wire is placed so that there is room on the front side, a pair of wire barrels that extend to both edges of the bottom plate, and a front plate that extends to the front side of the bottom plate A terminal fitting that is connected to the electric wire by being crimped to the core wire so that the wire barrel holds the core wire on the bottom plate, and an inner side of the bottom plate in the space portion. A water stop wall for closing the groove standing upright, and an opening end portion on the front side are in close contact with each other so as to surround the water stop wall and the bottom plate of the portion that supports the water stop wall, Open end of the base is insulated at the root of the core wire A tubular water stop coating that closely adheres so as to surround the resin, wherein the water stop wall has an adhesive surface to a metal and is processed into a predetermined shape Is provided by being fitted inside the bottom plate in the room portion.

  In the electric wire with terminal fitting, a water blocking wall is provided on the inner side of the bottom plate in the margin portion of the terminal fitting to block a groove in the portion. Therefore, even if a liquid infiltrate made of water or the like is transmitted from the connecting portion side of the terminal fitting toward the bottom plate side, the infiltrated matter is blocked by the water blocking wall. As a result, the core wire or the like disposed on the back side (rear side) of the water blocking wall is prevented from being in contact with and corroding the infiltrated material.

  In the electric wire with terminal fitting, the water blocking wall is provided by fitting a resin processed product whose surface has adhesiveness to metal and processed into a predetermined shape into the inside of the bottom plate in the room portion. It is done. Therefore, since the water blocking wall is not provided outside the bottom plate, it is possible to set the diameter of the water blocking wall portion to be smaller accordingly.

  In the electric wire with terminal fittings, the water blocking wall may be provided by heat-treating the resin processed product after fitting the resin processed product inside the bottom plate in the room. If the resin processed product is one that exhibits metal adhesion by heat treatment, a water blocking wall having excellent adhesion to the bottom plate of the terminal fitting can be easily obtained.

  In the electric wire with terminal fitting, the terminal fitting may include an insulation barrel that holds the insulating layer of the electric wire.

  In the electric wire with terminal fitting, the metal constituting the core wire and the metal constituting the terminal fitting may be different.

  In the electric wire with terminal fitting, it is preferable that an adhesive layer or an adhesive layer is formed on the inner peripheral surface of the water blocking coating. When the adhesive layer or the pressure-sensitive adhesive layer is formed on the inner peripheral surface as described above, the water blocking coating can be easily adhered to the connection portion of the electric wire and the terminal fitting.

  In the electric wire with terminal fitting, the water stop coating may be formed of a heat shrinkable tube.

  The method for manufacturing an electric wire with terminal fitting according to the present invention includes an electric wire having a core wire, an insulating layer covering the outer periphery of the core wire so that a terminal end of the core wire is exposed, and both edges so as to form a groove inside. While standing, it extends along the axial direction, and a bottom plate on which the end of the core wire is placed so that there is room on the front side, a pair of wire barrels extending on both edges of the bottom plate, and a front side of the bottom plate A terminal fitting that is extended and connected to the other end, and is attached to the wire by being crimped to the core wire so that the wire barrel holds the core wire on the bottom plate, The water blocking wall for closing the groove standing on the inner side of the bottom plate and the opening end on the front side are closely attached so as to surround the water blocking wall and the bottom plate portion of the portion that supports the water blocking wall. The opening end on the rear side A tubular water stop coating that tightly surrounds the insulating layer at the base, and a manufacturing method of an electric wire with a terminal metal fitting, wherein a resin composition having adhesiveness to a metal is used, A process of obtaining a resin processed product by processing into a predetermined shape that fits inside the bottom plate portion and closes the groove, and the resin processed product is fitted inside the bottom plate to stand up and stop the water. Forming a wall.

  In the method of manufacturing an electric wire with terminal fitting, the water blocking wall is formed with a resin composition having adhesiveness to a metal, and a predetermined shape that fits inside the bottom plate portion in the margin and closes the groove. The resin processed product is processed into a shape to obtain a resin processed product, and the resin processed product is fitted into the bottom plate to stand up to form the water blocking wall. That is, since the resin processed product can be attached (assembled) simply by being fitted inside the bottom plate, the water blocking wall formation time is shortened and manufactured compared to the case where the water blocking wall is formed by molding. Cost can be reduced.

  The manufacturing method of the electric wire with a terminal fitting may include a step of heat-treating the fitted resin product together with the terminal fitting. By using the resin processed product that exhibits metal adhesion by heat treatment, the resin processed product that has been fitted together with the terminal metal fitting is subjected to heat treatment, thereby improving the adhesion to the bottom plate of the terminal metal fitting. An excellent water barrier can be easily obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the electric wire with a terminal metal fitting excellent in waterproofness (waterproofness) and the electric wire with a terminal metal fitting can be provided.

The perspective view of the electric wire with a terminal metal fitting concerning Embodiment 1 of the present invention. Side view of electric wire with terminal bracket Cutaway cross-sectional view of the main part of an electric wire with terminal fittings Perspective view of processed resin used for water blocking wall Explanatory drawing showing the process of fitting the resin workpiece into the groove of the terminal fitting Sectional view of the water blocking wall erected on the bottom plate of the terminal fitting Sectional drawing in the AA line of the electric wire with a terminal metal fitting shown by FIG. The top view which shows the state connected with respect to the carrier so that a plurality of terminal metal pieces may be arranged Explanatory drawing (plan view) showing the process of heat-treating the terminal metal piece with the resin workpiece attached Explanatory drawing (perspective view) showing the process of placing the electric wire on the bottom plate of the terminal fitting Top view of the terminal fitting with electric wires placed on the bottom plate Plan view of an electric wire with terminal fittings attached by crimping wire barrel and insulation barrel Cutaway cross-sectional view of the main part showing a state where an unheated heat-shrinkable tube is covered on the electric wire with the terminal fitting attached Sectional drawing of the water stop wall part molded in the electric wire with a terminal metal fitting concerning a comparative example Sectional drawing of the resin processed material utilized in other embodiments Sectional drawing which shows the state which fitted the resin processed material shown by FIG. 15 in the baseplate of the terminal metal fitting

<Embodiment 1>
The electric wire 1 with a terminal metal fitting which concerns on Embodiment 1 of this invention is demonstrated referring FIG. 1 thru | or FIG. As shown in FIG. 1 and the like, an electric wire 1 with a terminal fitting includes an electric wire 2, a terminal fitting 3 attached to the end of the electric wire 2, a water blocking wall 4 attached to the terminal fitting 3, and the water blocking wall. 4 and a tubular waterproof coating 5 that covers the connection portion between the electric wire 2 and the terminal fitting 3.

(Wire 2)
As shown in FIG. 2 and the like, the electric wire 2 includes a single core wire 21 formed by twisting a plurality of fine metal wires and an insulating layer 22 made of a synthetic resin that covers the outer periphery of the core wire 21. Examples of the material constituting the core wire 21 include copper, a copper alloy, aluminum, an aluminum alloy, and the like, and are appropriately selected from arbitrary metal materials as necessary. In the present embodiment, aluminum or an aluminum alloy is used as the material of the core wire 21. The insulating layer 22 at the end portion of the electric wire 2 is removed. Therefore, the end portion of the core wire 21 is not covered with the insulating layer 22 and is exposed. In other embodiments, the core wire 21 may be a single core wire.

(Terminal fitting 3)
The terminal fitting 3 is a so-called female type, and is connected to a mating male terminal (not shown). The terminal fitting 3 is obtained, for example, by pressing a metal plate material into a predetermined shape. As a metal material which comprises the terminal metal fitting 3, copper, a copper alloy, etc. are mentioned, for example, It selects suitably from arbitrary metal materials as needed. In addition, the plating layer (not shown) is formed in the surface of the metal plate material which comprises the terminal metal fitting 3 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. In the present embodiment, a tin plating layer is formed on the surface of a metal material (copper or copper alloy) constituting the terminal fitting 3. In another embodiment, a metal plate material on which no plating layer is formed may be used as the material for the terminal fitting 3.

  The terminal fitting 3 includes a bottom plate 31, a wire barrel 32, a tip portion 33, and an insulation barrel 34.

  The bottom plate 31 has a shape extending along the axial direction of the electric wire 2 with both edges standing so that a groove 35 is formed inside. The bottom plate 31 has a curved bottom surface and a substantially U-shaped cross section. The end portion of the exposed core wire 21 of the electric wire 2 and the base insulating layer 22 of the core wire 21 are both placed on the bottom plate 31 so as to fit in the groove 35. There is a portion (region) 36 on the front side of the bottom plate 31 where the core wire 21 is not placed. That is, the exposed end portion of the core wire 21 is placed on the front side of the bottom plate 31 so that there is room (space). In the present specification, this portion 36 is particularly referred to as a blank portion. As will be described later, the water blocking wall 4 is provided in a part of the room portion 36.

  A pair of wire barrels 32 facing each other are provided on both edges of the bottom plate 31 in the portion where the core wire 21 is placed. The wire barrel 32 has a plate-like shape, and is provided so as to rise from both edges of the bottom plate 31 before the terminal fitting 3 is attached to the electric wire 2. When the terminal metal fitting 3 is attached to the electric wire 2, the wire barrel 32 is crimped (crimped) to the core wire 21 so as to hold the core wire 21 on the bottom plate 31.

  A pair of insulation barrels 34 are provided on both edges of the bottom plate 31 where the base insulating layer 22 is placed. The insulation barrel 34 is in the form of a plate that is narrower than the wire barrel 32, and rises from both edges of the bottom plate 31 in the same manner as the wire barrel 32 before the terminal fitting 3 is attached to the electric wire 2. Is provided. The insulation barrel 34 is pressure-bonded to the insulating layer 22 so as to hold the base insulating layer 22 placed on the bottom plate 31.

  The distal end portion 33 is extended to the front side of the bottom plate 31 and has a cylindrical connecting tube portion 331 having a substantially square cross section. An elastic contact piece 332 (see FIG. 9) that elastically contacts a mating male terminal fitting (not shown) is provided in the connecting tube portion 331.

(Water barrier 4)
As shown in FIG. 4, the water blocking wall 4 is manufactured using a resin processed product 41 processed into a predetermined shape. The resin processed product 41 of the present embodiment has a substantially cylindrical shape, and is processed into a shape that fits inside the bottom plate 31 in the blank portion 36. Examples of the resin material used for the resin processed product 41 include a metal-adhesive good adhesive elastomer (trade name: Perprene (registered trademark), Toyobo Co., Ltd.). This resin material has moderate rigidity (elasticity) and exhibits adhesiveness to metal by heat treatment. When the resin processed product 41 made of this resin material is heat-treated at a predetermined temperature, the molten resin material oozes out from the surface while maintaining the shape (rigidity) as a whole. This exuding thing (thermoplastic adhesive) has adhesiveness to the metal. For example, the melting point of the base material portion in the resin material is about 170 ° C., and the melting point of the portion that exudes as described above (thermoplastic adhesive) is about 120 ° C. In addition, the said resin processed material 41 does not have the adhesiveness with respect to a metal at normal temperature (room temperature), and is easy to handle it. Such a resin processed product 41 is obtained, for example, by extruding the resin material into an elongated cylindrical molded product using an extrusion molding apparatus, and cutting the molded product into a predetermined shape (size). .

  As shown in FIG. 5, the resin processed product 41 is fitted inside the bottom plate 31 (that is, the groove 35) in the room portion 36. The width of the groove 35 in the bottom plate 31 (the margin portion 36) is set to be slightly smaller than the diameter of the resin processed product 41 having a substantially circular cross section. The resin workpiece 41 is fitted (press-fit) and attached to the inside (groove 35) of the bottom plate 31 set to such a width (groove width). The resin workpiece 41 attached in this way is erected so as to close the groove 35 inside the bottom plate 31. The resin processed product 41 has appropriate elasticity, and is in close contact with the inner surface 361 of the bottom plate 31 so as to push back from the inside to the outside of the bottom plate 31. In addition, the operation | work which attaches the resin processed material 41 to the terminal metal fitting 3 may be performed before attaching the electric wire 2 to the said terminal metal fitting 3, and may be performed after attaching the electric wire 2 to the said terminal metal fitting 3. FIG.

  The resin processed product 41 fitted inside the bottom plate 31 in the room portion 36 is then heat-treated (first heat-treated) together with the terminal fitting 3. This heat treatment is performed in order to bring the outer peripheral surface 42 of the resin processed product 41 and the inner surface (metal surface) 361 of the bottom plate 31 in the blank portion 36 in a liquid-tight manner without gaps. As described above, when the resin processed product 41 of the present embodiment is heated at a predetermined temperature (for example, 120 ° C.), a liquid resin material (thermoplastic adhesive) oozes from the surface. The oozing resin material enters between the outer peripheral surface 42 of the resin processed product 41 and the inner surface 361 of the bottom plate 31 during the heat treatment, and the space between them is liquid-tightly closed. After the heat treatment, the liquid resin material is cooled and hardened. As a result, the resin processed product 41 is fixed in close contact with the bottom plate 31 without gaps, and becomes the water blocking wall 4.

  As shown in FIG. 6, the water blocking wall 4 has a part (upper portion) protruding from the groove 35 and exposed. As will be described later, this exposed portion is finally covered with a cylindrical water blocking coating 5.

(Water-stop coating 5)
The water blocking coating 5 has a cylindrical shape (tube shape) and is covered between the water blocking wall 4 and the end of the insulating layer 22 so as to surround the connection portion between the terminal fitting 3 and the electric wire 2. ing. The opening end 51 on the front side of the water blocking coating 4 is in close contact with the water blocking wall 4 and the bottom plate 31 of the portion that receives and supports the water blocking wall 4. The portion that supports the water blocking wall 4 is a part of the bottom plate 31 in the room portion 36. On the other hand, the rear open end 52 is in close contact with the insulating layer 22 so as to surround the insulating layer 22 at the base of the core wire 21 (the end of the insulating layer 22).

  In this embodiment, the waterproof coating 5 of the part which exists between the opening end part 51 of the front side and the opening end part 52 of the rear side is a connection part of the terminal fitting 3 and the electric wire 2 from the outside. It is closely attached so that it can be tightened. That is, by the tubular water-stop coating 5, the terminal core 3 (that is, the wire barrel 32, the insulation barrel 34, and the bottom plate 31) on the rear side of the exposed core wire 21 and the portion where the water-stop wall 4 is provided. ) And the end portion of the insulating layer 22 are surrounded.

  The water-stop coating 5 of the present embodiment is a so-called heat shrinkable tube, and is made of a synthetic resin material that shrinks by heat treatment (second heat treatment). Note that an adhesive layer or a pressure-sensitive adhesive layer (not shown) is formed on the inner peripheral surface of the water blocking coating 5. The adhesive layer or the pressure-sensitive adhesive layer develops adhesiveness or tackiness by being heated and softened or melted. As the adhesive or pressure-sensitive adhesive used for the adhesive layer or the pressure-sensitive adhesive layer, a known one used in this type of electric wire 1 can be applied. In another embodiment, the adhesive layer or the pressure-sensitive adhesive layer may not be provided on the inner peripheral surface of the water blocking coating 5.

  7 is a cross-sectional view taken along line AA of the electric wire with terminal fittings shown in FIG. As shown in FIG. 7, the opening end portion 51 of the water blocking coating 5 that has been heat-shrinked by the heat treatment connects the water blocking wall 4 (resin processed product 41) and the bottom plate 31 that supports and supports the water blocking wall 4. It is in close contact so as to surround (tighten). In this manner, the water blocking wall 4 (resin processed product 41) that protrudes upward from the bottom plate 31 is also covered with the water blocking coating 5.

(Manufacturing process)
Then, an example of the manufacturing process of the electric wire 1 with a terminal metal fitting which concerns on this embodiment is shown. First, a metal plate material is subjected to a punching process to form a band-shaped carrier 300 and a plurality of terminal metal pieces 30 connected to the side edges of the carrier 300. That is, the plurality of terminal fittings 30 are connected to the carrier 300 at once. The carrier 300 is formed with feed holes 301 arranged at substantially equal intervals along the longitudinal direction. As the feed hole 301, a substantially circular shape and a substantially rectangular shape are alternately arranged. The feed hole 301 is set so that a feed claw (not shown) provided in a processing machine (not shown) is engaged.

  A plurality of terminal metal pieces 30 are connected to the carrier 300 so as to be arranged at substantially equal intervals along the longitudinal direction. Immediately after being punched out, the terminal metal piece 30 has a flat plate shape, and is provided so as to correspond to each part (the bottom plate 31, the wire barrel 32, the insulation barrel 34, and the front end part 33) constituting the terminal metal piece 3. Yes.

  In this punching step, a plurality of recesses 37 may be formed on the bottom plate 31 where the wire barrel 32 is extended. The concave portion 37 has a substantially quadrangular shape (substantially parallelogram shape), a pair of first sides substantially perpendicular to the extending direction of the core wire 21 (electric wire 2), and the extending direction of the core wire 21 (electric wire 2) from 90 °. Also comprises a pair of second sides that intersect at a small angle. The adjacent recesses 37 are arranged such that the first sides are arranged in a straight line and the second sides are arranged in a straight line. Such a concave portion 37 can increase the fixing force between the wire barrel 32 and the core wire 21 while suppressing a decrease in the electric resistance value. In addition, these recessed parts 37 may be formed in a process different from punching.

  A bending step is performed on the metal plate after the punching step. By this bending process, the terminal metal piece 3 is three-dimensionally adjusted to form the terminal metal piece 3 as shown in FIG.

  Next, a feed claw (not shown) is engaged with the feed hole 301 formed in the carrier 300, and the marginal portion 36 of each terminal fitting piece 30 is sequentially fed while feeding the terminal fitting piece 30 (terminal fitting 3). A resin processed product 41 (see FIG. 4 and the like) that has been processed in advance into a predetermined shape is press-fitted (inserted) into the inside (groove 35) of the bottom plate 31 by the assembly machine. The resin processed product 41 is formed by extruding a predetermined resin material having adhesiveness to a metal into an elongated cylindrical molded product using an extrusion molding device, and the molded product is formed into a predetermined shape (that is, the room). It is obtained by cutting into a portion 36 that fits inside the bottom plate 31 and closes the groove 35 (resin processed product manufacturing process). Note that the movement of the carrier 300 is stopped while the resin processed product 41 is fitted inside the bottom plate 31. After the fitting, the movement of the carrier 300 is resumed.

  A heat treatment step (first heat treatment step) is performed on the terminal fitting piece 30 (terminal fitting 3) in which the resin workpiece 41 is fitted. In this heat treatment step, a thermoplastic adhesive having adhesiveness to the metal oozes out from the resin processed product 41, and the resin processed product 41 is separated from the bottom plate 31 by the oozed thermoplastic adhesive. Adhere closely. As shown in FIG. 9, the terminal fitting piece 30 (terminal fitting 3) in which the resin workpiece 41 is fitted is sequentially sent into the heating device 6. The heat treatment process is performed while passing through the heating device 6. In this way, the heat treatment process is continuously performed on the plurality of terminal metal pieces 30 (terminal metal pieces 3).

  The terminal metal piece 30 (terminal metal fitting 3) after the heat treatment process has the end portion of the electric wire 2 placed on the bottom plate 31 (see FIG. 10). The insulating layer 22 is removed from the terminal portion of the electric wire 2 so that the core wire 21 is exposed in advance. At this time, the exposed core 21 portion is placed on the bottom plate 31 where the wire barrel 32 is formed. The insulating layer 22 at the base of the core wire 21 (the end of the insulating layer) is placed on the bottom plate 31 where the insulation barrel 34 is formed. In addition, there is a margin portion 36 on the front side of the core wire 21, and the water blocking wall 4 is erected on the bottom plate 31 in the margin portion 36 (see FIG. 11).

  As described above, after the end portion of the electric wire 2 is placed on the bottom plate 31 of the terminal fitting 3, the wire barrel 32 and the insulation barrel 34 of the terminal fitting 3 are crimped using a crimping device (not shown). (Crimping process). The wire barrel 32 is crimped to the core wire 21, and the insulation barrel 34 is crimped to the end of the insulating layer 22 (see FIG. 12). In addition, a pair of insulation barrel 34 is crimped | bonded in the state in which the front side was piled up.

  In the present embodiment, in the crimping process, a cutting process for separating the terminal metal piece 30 from the carrier 300 is performed at the same time. When the terminal fitting 3 is thus crimped to the electric wire 2 and the terminal fitting 3 (terminal fitting piece 30) is separated from the carrier 300, the electric wire 2 with the terminal fitting 3 attached to the end is obtained (FIG. 12). reference).

  Next, as shown in FIG. 13, an unheated cylindrical water-stop coating 5 made of a heat-shrinkable tube is placed so as to surround the connection portion between the electric wire 2 and the terminal fitting 3. The water blocking coating 5 may be inserted and covered from the terminal metal fitting 3 side, or may be inserted and covered from the electric wire 2 side. In addition, when covering from the electric wire 2 side, it is preferable to make the water stop coating 5 penetrate the electric wire 2 beforehand before the said crimping | compression-bonding process. The inner diameter of the water-stop coating (heat-shrinkable tube) 5 in the unheated state is set to be larger than the connection portion between the electric wire 2 and the terminal fitting 3. The water blocking coating 5 is positioned in consideration of the amount of heat shrinkage so that the opening end 51 on the front side and the opening end 52 on the rear side can surround the connecting portion.

  After being positioned as described above, the electric wire 2 and the terminal fitting 3 covered with the heat-shrinkable tube (water-stop coating) 5 are subjected to a heat treatment step (second heat treatment step) in a heating device (not shown). . In this heat treatment step, the water-stop coating 5 made of the heat-shrinkable tube is thermally contracted, and an adhesive layer (not shown) formed on the inner peripheral surface of the water-stop coating 5 develops adhesiveness. As a result, the inner surface (inner peripheral surface) of the water blocking coating 5 is in close contact with the connection portion of the electric wire 2 and the terminal fitting 3 with no gap corresponding to the surface shape (see FIG. 3 and the like).

  By the above manufacturing process, the electric wire 1 with a terminal metal fitting in which the connecting portion is surrounded by the cylindrical water blocking coating 5 is obtained. Since the electric wire 1 obtained in this way includes the water blocking wall 4 and the water blocking coating 5, it is excellent in waterproofness. In particular, even if water is transmitted from the front side (tip 33 side) of the terminal fitting 3, the water blocking wall 4 is erected in the groove 35 on the front side (space 36) of the bottom 31, and this Since the water blocking wall 4 and the bottom plate 31 of the part that supports the water blocking wall 4 are surrounded by the water blocking coating 5 (opening end 51), water enters the rear side of the water blocking wall 4. Is suppressed.

  Further, as described above, the electric wire 1 of the present embodiment can be provided simply by fitting the resin processed material 41 that will later become the water blocking wall 4 into the curved bottom plate 31 of the terminal fitting 3. Then, by performing heat treatment (first heat treatment) in a state where the resin processed product 41 is fitted, the surface (outer peripheral surface 42) of the resin processed product 41 and the inner surface 361 of the bottom plate 31 are liquidated. It can be closely and easily adhered.

  The water blocking wall 4 of the present embodiment has excellent heat resistance depending on the resin material used. Thus, even if it is the water stop wall 4 which is excellent in heat resistance, the water stop wall 4 can be easily attached to the predetermined position of the terminal metal fitting 3 by selection of the resin material to be used.

  FIG. 14 is a cross-sectional view of the molded water blocking wall 4A portion in the electric wire 1A with terminal fittings according to the comparative example. The water blocking wall 4A of the electric wire 1A is integrally formed with the bottom plate 31 of the terminal fitting 3 by molding. Therefore, the water blocking wall 4 </ b> A is formed so as to wrap the bottom plate 31. That is, a part of the water blocking wall 4A is also formed outside the bottom plate 31. On the other hand, the water blocking wall 4 of the present embodiment is formed only inside the bottom plate 31 as shown in FIG. 7 and the like, and therefore has a smaller diameter than the water blocking wall 4A formed by molding. It has a structure that is easy to convert.

<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 resin processed product 41 is used in which the thermoplastic adhesive oozes out from the surface during the heat treatment, but in other embodiments, for example, as shown in FIG. Alternatively, a resin processed product 41 including a core material 411 having a circular cross section and a skin material 412 covering the outer peripheral surface of the core material 411 may be used. For example, the core material 411 is made of a resin material having a melting point of about 170 ° C., and the skin material 412 is made of a resin material (adhesive plastic resin) having a melting point of about 120 ° C. In this case, the skin material 412 is melted and deformed during the heat treatment to become an adhesive component. As shown in FIG. 16, the resin processed product 41 having such a configuration is also provided by being fitted (press-fitted) inside the bottom plate 31. After being fitted inside the bottom plate 31 as described above, when the heat treatment is performed, the skin material 412 portion of the resin processed product 41 is melted and deformed so as to conform to the shape of the inner surface 361 of the bottom plate 31. Then, the outer peripheral surface 42 of the resin processed product 41 (that is, the surface of the skin material 412) and the inner surface 361 of the bottom plate 31 are in liquid-tight contact. The core material 411 does not melt even when the heat treatment is performed as described above, and maintains the shape of the resin processed product 41.

(2) In the above embodiment, the terminal fitting 3 is provided with the insulation barrel 34. However, in other embodiments, the terminal metal fitting 3 may be configured without the insulation barrel 34.

(3) In the above embodiment, the opening end 52 on the rear side of the water blocking coating 5 is in close contact so as to surround the insulating layer 22. The open end 52 may be brought into close contact with the resin ring.

(4) In the above embodiment, the terminal fitting 3 is a so-called female type, but in other embodiments, it may be a male type or a round terminal (a so-called LA terminal). Also good. That is, the shape of the terminal fitting 3 may be appropriately selected according to the purpose.

(5) In the above embodiment, the shape of the water blocking wall 4 (resin processed product 41) is a columnar shape, but in other embodiments, the cross section is a columnar shape such as an elliptical shape, an oval shape, or a rectangular shape. It may be a thing. That is, the shape of the water blocking wall 4 may be appropriately selected according to the inner shape of the bottom plate 31 in the terminal fitting 3.

(6) In the above-described embodiment, the water-stop coating 5 is formed in a cylindrical shape in advance, but in other embodiments, for example, a sheet-like water-stop tape is used as the electric wire 2 and You may use what was wound around the connection part of the said terminal metal fitting 3, and was formed in the cylinder shape.

(7) In the above embodiment, a heat treatment (first heat treatment) for bringing the water blocking wall 4 (resin processed product 41) into close contact with the bottom plate 31 of the terminal fitting 3, and a water blocking coating 5 made of a heat shrinkable tube. However, in another embodiment, these heat treatment steps may be performed simultaneously.

(8) In the above embodiment, the crimping process for crimping the terminal fitting 3 to the electric wire 2 and the cutting process for separating the terminal fitting piece 30 (terminal fitting 3) from the carrier are performed simultaneously. In the embodiment, the cutting step may be performed before the crimping step, or the crimping step may be performed after the cutting step.

(9) In the above embodiment, a heat-shrinkable tube is used as the water-stop coating 5, but in other embodiments, for example, a tubular member having elasticity such as a rubber tube is used as the water-stop coating 5. May be.

(10) In the above embodiment, the resin processed product 41 is manufactured by extruding a predetermined resin material. However, in another embodiment, for example, the resin material is sheeted using a T-die. It is possible to manufacture a resin processed product having a predetermined shape by molding into a shape (sheet molding) and punching the sheet-shaped molded product.

DESCRIPTION OF SYMBOLS 1 ... Electric wire 2 with a terminal metal fitting ... Electric wire 21 ... Core wire 22 ... Insulating layer 3 ... Terminal metal fitting 31 ... Bottom plate 32 ... Wire barrel 33 ... Tip part 34 ... Insulation barrel 35 ... Groove 36 ... Space part 4 ... Water blocking wall 41 ... Resin processed product 5 ... Water stop coating (heat-shrinkable tube)

Claims (8)

An electric wire having a core wire and an insulating layer covering the outer periphery of the core wire so that the end of the core wire is exposed;
A bottom plate that extends along the axial direction with both edges standing so as to form a groove on the inside, and a pair of ends that extend on both edges of the bottom plate, on which the end of the core wire is placed so that there is room for the front side It has a wire barrel and a tip that extends to the front side of the bottom plate and is connected to the other side, and is attached to the wire by being crimped to the core wire so that the wire barrel holds the core wire on the bottom plate A terminal fitting,
A water blocking wall for closing the groove erected on the inside of the bottom plate in the room portion;
The opening end on the front side is closely attached to surround the water blocking wall and the bottom plate of the portion that supports the water blocking wall, and the opening end on the rear side surrounds the base insulating layer in the core wire. A wire with terminal fittings, comprising a tubular water-stop coating that adheres to
The terminal wall is provided with a terminal fitting, wherein the water blocking wall is provided by fitting a resin processed product whose surface has adhesiveness to a metal and processed into a predetermined shape inside the bottom plate in the space portion Electrical wire.   2. The electric wire with terminal fitting according to claim 1, wherein the water blocking wall is provided by heat treatment after the resin processed product is fitted inside the bottom plate in the room.   The said terminal metal fitting is provided with the insulation barrel which hold | maintains the said insulating layer of the said electric wire, The electric wire with a terminal metal fitting of Claim 1 or Claim 2 characterized by the above-mentioned.   The electric wire with a terminal metal fitting as described in any one of Claim 1 thru | or 3 from which the metal which comprises the said core wire differs from the metal which comprises the said terminal metal fitting.   The electric wire with a terminal metal fitting according to any one of claims 1 to 4, wherein an adhesive layer or an adhesive layer is formed on an inner peripheral surface of the water blocking coating.   The electric wire with a terminal fitting according to any one of claims 1 to 5, wherein the water blocking coating is made of a heat shrinkable tube. An electric wire having a core wire and an insulating layer covering the outer periphery of the core wire so that the end of the core wire is exposed;
A bottom plate that extends along the axial direction with both edges standing so as to form a groove on the inside, and a pair of ends that extend on both edges of the bottom plate, on which the end of the core wire is placed so that there is room for the front side It has a wire barrel and a tip that extends to the front side of the bottom plate and is connected to the other side, and is attached to the wire by being crimped to the core wire so that the wire barrel holds the core wire on the bottom plate A terminal fitting,
A water blocking wall for closing the groove erected on the inside of the bottom plate in the room portion;
The opening end on the front side is closely attached to surround the water blocking wall and the bottom plate of the portion that supports the water blocking wall, and the opening end on the rear side surrounds the base insulating layer in the core wire. A method for producing an electric wire with a terminal fitting comprising:
Using a resin composition having adhesiveness to a metal, processing into a predetermined shape that fits inside the bottom plate in the margin portion and closes the groove, and obtaining a resin processed product,
And a step of forming the water blocking wall by fitting the resin processed product inside the bottom plate to form the water blocking wall.   The manufacturing method of the electric wire with a terminal metal fitting of Claim 7 including the process of heat-processing the said resin processed material fitted together with the said terminal metal fitting.

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