JP5510739B2 - Electric wires with terminal fittings and terminal fittings - Google Patents

Description

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

  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 formed by coating the outer periphery of a core wire with an insulating coating, and a terminal fitting connected to the core wire exposed from the insulating coating. The terminal fitting includes a flat board portion on which a core wire is placed, and a wire barrel that protrudes from the board portion and is crimped to the core wire.

  A region from the substrate portion to the end portion of the insulating coating is covered with a heat shrinkable tube. One end of the heat-shrinkable tube covers a core wire crimped by a wire barrel and the other end is in close contact with the insulating coating.

JP 2000-259883 A

  However, according to said structure, since the board | substrate part has comprised flat form, we are anxious about a clearance gap forming between the one end side of a heat-shrinkable tube, and a board | substrate part. Then, there is a concern that water enters the heat-shrinkable tube from this gap and this water comes into contact with the core wire and the wire barrel. Then, we are anxious about generating troubles, such as the surface of a core wire or a wire barrel being oxidized.

  This invention is completed based on the above situations, Comprising: It aims at providing the electric wire with a terminal metal fitting which was excellent in waterproofness, and a terminal metal fitting.

  In order to solve the above problems, the present invention provides an electric wire with a terminal fitting in which a terminal fitting is connected to an electric wire formed by coating the outer periphery of a core wire with an insulating coating, and the terminal fitting is an end portion of the insulating coating. A water barrel that is crimped to the core wire exposed from the wire, and an extending portion that extends from a bottom plate of the wire barrel, and the water blocking wall formed by molding a synthetic resin in the extending portion. A cylindrical water stop covering the core wire between the water stop wall and the end of the insulating coating in close contact with the outer surface of the water stop wall and the outer surface of the end of the insulating cover A covering is provided, and at least one of a protruding portion protruding from the end portion and a recessed portion recessed from the end portion is formed at an end portion in the width direction of the extending portion. It is an electric wire with a terminal metal fitting.

  Further, the present invention is a terminal fitting connected to the core wire exposed from an electric wire formed by coating an outer periphery of the core wire with an insulation coating, wherein the terminal fitting is exposed from an end portion of the insulation coating. A wire barrel crimped to the wire barrel and an extending portion extending from a bottom plate of the wire barrel, and the extending portion is provided with a water blocking wall formed by molding synthetic resin. A cylindrical water-stop coating is provided to tightly contact the outer surface and the outer surface of the end portion of the insulating coating so as to cover the core wire between the water blocking wall and the end portion of the insulating coating. At least one of a projecting portion protruding from the end portion and a recessed portion recessed from the end portion is formed at the end portion in the width direction of the terminal fitting.

  According to this invention, since the water stop wall is provided in the extension part, it can suppress that water permeates from the extension part. Furthermore, since the water blocking wall is in close contact with the inner surface of the water blocking coating, it is possible to prevent water from entering between the water blocking wall and the water blocking coating. Thereby, since the area | region from the water stop wall to the edge part of insulation coating is waterproofed by water stop coating, it can suppress that water adheres to a core wire and a wire barrel. As a result, according to the present invention, it is possible to provide an electric wire with terminal fittings and a terminal fitting that are excellent in waterproofness.

  As described above, the waterproof property can be enhanced by providing the water blocking wall and the water blocking coating, but the gap between the end of the extension portion opposite to the wire barrel side and the water blocking wall. Thus, water may adhere to a part of the extension due to water soaking in. In many cases, the terminal fittings are manufactured through a process in which a metal plate material is plated and then punched into a predetermined shape, so that the end faces of the terminal fittings are not plated and are oxidized more than other parts ( Corrosion) is easy to proceed. Therefore, when water penetrates into the extended portion, there is a concern that the corrosion proceeds along the end face.

  However, in the present invention, since at least one of the projecting portion and the recessed portion is formed at the end portion in the width direction of the extending portion, the length of the end surface of the extending portion does not include the projecting portion or the recessed portion. It is longer than the configuration by the length of the periphery of the convex part and the concave part (see FIG. 5). As a result, according to the present invention, since the corrosion path becomes long, it is possible to delay the corrosion reaching the wire barrel.

As embodiments of the present invention, the following embodiments are preferable.
It is preferable that the projecting portions are respectively formed at both ends of the extending portion in the width direction. If it is such an aspect, a corrosion path can be lengthened in the edge part of the both sides of the width direction of an extension part, and the intensity | strength of an extension part can be raised.

It is preferable that a hole is formed in the convex portion.
Since the corrosion of the terminal fitting proceeds along the end face and also proceeds in the inner direction, in the extended portion including the convex portion where the hole is not formed, as shown in FIG. There is a concern that the corrosion will proceed to the end opposite to the part without stopping. Therefore, when the above-described mode is adopted, as shown in FIG. 10, even if the corrosion proceeds inward from one end (end face), the corrosion is interrupted by the hole (see the line F <b> 2 in FIG. 10). ) So that corrosion can be prevented from reaching the wire barrel.

  It is preferable that the water blocking wall is formed so as to surround the outer periphery of the extending portion over the entire periphery. If it is set as such an aspect, since a water stop wall can closely_contact | adhere to the inner surface of a water stop coating over the perimeter, waterproofing can be improved further.

  It is preferable that a resin ring is fitted on an end portion of the insulating coating, and an inner surface of the water blocking coating is in close contact with the resin ring. If it is set as such an aspect, since it can suppress reliably that water permeates from the edge part side of insulation coating, waterproofness can be improved further.

  By the way, when the metal which comprises a core wire differs from the metal which comprises a terminal metal fitting, when water adheres over both a core wire and a wire barrel, we are anxious about generating electric corrosion in a core wire or a wire barrel. . According to the present invention, the core wire and the wire barrel are surely waterproofed by the waterproof coating, so that the core wire or the wire barrel can be prevented from being melted by electrolytic corrosion. For this reason, it is particularly effective when the metal constituting the core wire and the metal constituting the terminal fitting are different.

Moreover, it is particularly effective in an embodiment in which the core wire is made of aluminum or an aluminum alloy.
Since aluminum or aluminum alloy has a relatively low specific gravity, the weight of the electric wire can be reduced. On the other hand, since aluminum or aluminum alloy has a relatively high ionization tendency, it easily dissolves when electrolytic corrosion occurs. According to said aspect, since a core wire and a wire barrel are reliably water-stopped by a water-stop coating, it is especially effective when a core wire consists of aluminum or an aluminum alloy.

It is preferable that an adhesive layer or an adhesive layer is formed on the inner peripheral surface of the water blocking coating.
If it is set as such an aspect, the inner peripheral surface of a water stop coating and the area | region from a water stop wall to the edge part of an insulation coating can be stuck closely.

The water-stop coating is preferably a heat-shrinkable tube or an elastic tube having rubber elasticity.
If the water-stop coating is a heat-shrinkable tube, the inner diameter of the heat-shrinkable tube is relatively large before heating, so that it can be easily disposed on the outer periphery of the above region. Thereafter, the inner surface of the heat-shrinkable tube can be brought into close contact with the water blocking wall and the end portion of the insulating coating by being shrunk by heating. Thus, by using a heat-shrinkable tube as the water-stop coating, it is possible to improve the working efficiency of the process of arranging the heat-shrink tube on the outer periphery of the region from the water blocking wall to the end of the insulating coating.

  On the other hand, when the water blocking coating is an elastic tube, the elastic tube is disposed on the outer periphery of the region extending from the water blocking wall to the end portion of the insulating coating in a state where the diameter of the elastic tube is expanded, and then the elastic tube is restored and deformed. Then, the inner surface of the elastic tube is in close contact with the water blocking wall and the end of the insulating coating. As described above, according to this aspect, the elastic tube can be covered from the water blocking wall to the end portion of the insulating coating by a simple process.

  ADVANTAGE OF THE INVENTION According to this invention, the waterproofness of the electric wire with a terminal metal fitting and a terminal metal fitting can be improved.

The side view which shows the electric wire with a terminal metal fitting which concerns on Embodiment 1 of this invention Cutaway cross-sectional view of the main part showing the wire with terminal fitting The principal part expanded sectional view which shows the extension part The top view which shows the state which the bending process was complete | finished Plan view showing the state after the molding process The side view which shows the state which completed the molding process in the process of producing the electric wire with a terminal metal fitting concerning Embodiment 2. Plan view of the state of FIG. The top view which shows the state which the bending process was complete | finished Side view of the state of FIG. Schematic diagram schematically showing the state of corrosion at the protrusion of the extension Schematic diagram schematically showing the state of corrosion at the convex part without holes The side view which shows the state which the molding process was complete | finished in the process of producing the electric wire with a terminal metal fitting which concerns on Embodiment 3. Side view showing the state where the bending process is completed

<Embodiment 1>
The electric wire 10 with a terminal metal fitting which concerns on Embodiment 1 of this invention is demonstrated referring FIG. 1 thru | or FIG. The electric wire with terminal fitting 10 according to the present embodiment includes an electric wire 11 and a female terminal fitting 12 (an example of the terminal fitting 12) connected to the end of the electric wire 11.

(Wire 11)
The electric wire 11 includes one core wire 13 formed by twisting a plurality of fine metal wires, and an insulating coating 14 made of a synthetic resin that covers the outer periphery of the core wire 13. The core wire 13 is comprised from arbitrary metals as needed, such as copper, a copper alloy, aluminum, an aluminum alloy. In this embodiment, aluminum or an aluminum alloy is used. At the end of the electric wire 11, the core wire 13 is exposed by peeling off the insulating coating 14. The core wire 13 may be a single core wire.

(Female terminal fitting 12)
The female terminal fitting 12 is formed by pressing a metal plate material into a predetermined shape. As a metal which comprises the female terminal metal fitting 12, arbitrary metals, such as copper and a copper alloy, can be employ | adopted as needed. A plating layer (not shown) is formed on the surface of the metal plate. As a metal which comprises a plating layer, arbitrary metals, such as tin and nickel, can be employ | adopted as needed. In the present embodiment, a tin plating layer is formed on the surface of copper or a copper alloy. In addition, it is good also as a structure which does not form a plating layer on the surface of a metal plate material.

  The female terminal fitting 12 has a bottom plate 15 on which the insulation coating 14 and the core wire 13 of the electric wire 11 are placed. A pair of insulation barrels 16 project from the side edges of the bottom plate 15. The insulation barrel 16 is pressure-bonded to the insulation coating 14 so as to hold the insulation coating 14 from the outside in a state where the insulation coating 14 and the core wire 13 of the electric wire 11 are placed on the bottom plate 15.

  A pair of wire barrels 17 project from the side edge of the bottom plate 15 at a position closer to the end of the core wire 13 than the insulation barrel 16 on the bottom plate 15. The wire barrel 17 is crimped to the core wire 13 so as to be held from the outside of the core wire 13 in a state where the insulating coating 14 and the core wire 13 of the electric wire 11 are placed on the bottom plate 15.

  As shown in FIG. 4, in the region corresponding to the wire barrel 17 in the bottom plate 15 and the wire barrel 17, a plurality of recesses 18 are formed on the surface on which the core wire 13 is placed. The concave portion 18 has a substantially quadrangular shape, and specifically has a substantially parallelogram shape. The recess 18 includes a pair of first sides that are substantially orthogonal to the direction in which the core wire 13 extends (left and right direction in FIG. 4), and a pair of second sides that intersect the direction in which the core wire 13 extends at an angle smaller than 90 °. . The adjacent recesses 18 are arranged such that the first sides are arranged in a straight line, and the second sides are arranged in a straight line. Thereby, since the metal mold | die (not shown) used when pressing the recessed part 18 can be formed by forming a some groove | channel, manufacturing cost can be reduced. Moreover, since the 1st edge | side of the recessed part 18 adjacent about the extending direction of the core wire 13 is distribute | arranged and overlapped about the extending direction of the core wire 13, it can improve the adhering force of the core wire 13 and the wire barrel 17. it can. In addition, since the rims of the plurality of recesses 18 are in sliding contact with the surface of the core wire 13, the contact area between the rim of the recesses 18 and the core wire 13 is increased. As a result, the electrical resistance value between the female terminal fitting 12 and the core wire 13 is reduced. can do.

  The bottom plate 15 is formed with an extending portion 19 that further extends in the direction in which the core wire 13 extends, and the surface on which the core wire 13 is placed is bent into a concave shape. The extending portion 19 has a substantially U-shaped cross section and opens upward. In addition, the cross-sectional shape of the extension part 19 may be a semicircular shape, for example, and the extension part 19 may be a flat plate shape, and may be an arbitrary shape as necessary.

  Now, a square-shaped convex portion 19A is projected and formed at both ends 19F and 19F in the width direction (vertical direction in FIG. 4) of the extending portion 19 one by one. Each convex portion 19A, 19A is bent in the inner direction (the central axis direction of the terminal fitting 10).

  The extension portion 19 is further formed with a connecting cylinder portion 20 that extends in the direction in which the core wire 13 extends to form a cylindrical shape and connect to a mating terminal fitting (not shown). An elastic contact piece 21 that elastically contacts the mating terminal fitting is provided in the connection cylinder portion 20.

(Water blocking wall 22)
The extension part 19 is provided with a water blocking wall 22 by molding a synthetic resin material. As the synthetic resin material for forming the water blocking wall 22, a thermoplastic resin such as polyamide, polyester, polypropylene, or polyethylene may be used, or a thermosetting resin such as an epoxy resin may be used. Any synthetic resin material can be used. As for said synthetic resin material, only 1 type may be used and a multiple types of synthetic resin material may be mixed and used. In the present embodiment, a polyamide-based thermoplastic resin is used.

  The water blocking wall 22 is formed so as to surround the entire outer periphery of the extending portion 19, and the convex portions 19 </ b> A and 19 </ b> A formed at both end portions 19 </ b> F and 19 </ b> F of the extending portion 19 are inward. It is housed inside the water blocking wall 22 in a bent state. The extending portion 19 is filled with a synthetic resin material that forms the water blocking wall 22. In the present embodiment, the cross-section of the water blocking wall 22 has a substantially square shape with rounded corners.

(Resin ring 23)
A resin ring 23 made of synthetic resin is fitted on the end of the electric wire 11. Specifically, a resin ring 23 having a circular cross section is formed at the end of the insulating coating 14 and at a position behind the portion where the insulation barrel 16 is crimped (in the direction opposite to the exposed core wire 13). It is fitted. The inner diameter of the resin ring 23 is set to be substantially the same as the outer diameter of the insulating coating 14. Thereby, the resin ring 23 can be easily fitted on the end of the electric wire 11. Note that “substantially the same” means that the inner diameter of the resin ring 23 is the same as the outer diameter of the insulating coating 14, the inner diameter of the resin ring 23 is slightly larger than the outer diameter of the insulating coating 14, and the inner diameter of the resin ring 23. And a case that is slightly smaller than the outer shape of the coating 14.

  As the synthetic resin material constituting the resin ring 23, a thermoplastic resin such as polyamide, polyester, polypropylene, or polyethylene may be used, or a thermosetting resin such as an epoxy resin may be used. Any synthetic resin material can be used. As for said synthetic resin material, only 1 type may be used and a multiple types of synthetic resin material may be mixed and used. In the present embodiment, a polyamide-based thermoplastic resin is used.

(Waterproof coating 25)
From the portion of the extending portion 19 where the water blocking wall 22 is formed, to the portion where the wire barrel 17, the insulation barrel 16 and the resin ring 23 are externally fitted, and further to the insulating coating 14 beyond the resin ring 23. This region is covered with a water-stop coating 25 made of a synthetic resin material. In the present embodiment, the water blocking coating 25 includes a heat shrinkable tube 24. In the present embodiment, an adhesive layer or an adhesive layer (not shown) is formed on the inner surface of the heat shrinkable tube 24. The adhesive layer or the pressure-sensitive adhesive layer is heated or softened or melted to express adhesiveness or tackiness. In addition, it is good also as a structure which does not provide an adhesive layer or an adhesion layer in the inner surface of the heat contraction tube 24. FIG. The length dimension of the heat shrinkable tube 24 is set longer than the length dimension of the region from the water blocking wall 22 to the resin ring 23.

  The inner surface of the heat shrinkable tube 24 is in close contact with the outer peripheral surface of the water blocking wall 22 without any gap in a state where the heat shrinkable tube 24 is heated and contracted. Further, the inner surface of the heat shrinkable tube 24 is in close contact with the outer peripheral surface of the resin ring 23 without any gap.

  As the synthetic resin material constituting the water blocking wall 22, a material that exhibits adhesiveness by being softened or melted by heating may be used. In this case, in the process of heating the heat shrinkable tube 24, the water blocking wall 22 can be softened or melted, and the inner surface of the heat shrinkable tube 24 and the water blocking wall 22 can be bonded.

  Moreover, as a synthetic resin material which comprises the resin ring 23, you may use what expresses adhesiveness by softening or melting by heating. In this case, in the step of heating the heat-shrinkable tube 24, the resin ring 23 can be softened or melted to bond the inner surface of the heat-shrinkable tube 24 and the resin ring 23. Furthermore, by forming the resin ring 23 with the synthetic resin material as described above, the resin ring 23 and the outer peripheral surface of the insulating coating 14 can be bonded.

(Manufacturing process)
Then, an example of the manufacturing process of the electric wire 10 with a terminal metal fitting which concerns on this embodiment is shown. First, by performing a punching process on a metal plate material, a carrier 26 having a strip shape and a plurality of terminal metal pieces 27 connected to the side edges of the carrier 26 are formed. The carrier 26 is formed with feed holes 28 arranged at substantially equal intervals along the longitudinal direction. A feed claw (not shown) provided in the processing machine is engaged with the feed hole 28.

  A plurality of terminal metal pieces 27 are connected to the carrier 26 so as to be arranged at substantially equal intervals along the longitudinal direction. The terminal metal piece 27 includes a bottom plate 15 on which the insulation coating 14 and the core wire 13 of the electric wire 11 are placed, an insulation barrel 16 that protrudes from the bottom plate 15 and is crimped to the insulation coating 14, and a core wire 13 that protrudes from the bottom plate 15. A wire barrel 17 to be crimped to.

  In this punching step, a plurality of recesses 18 may be formed on the surface of the wire barrel 17 on the side where the core wire 13 is placed. Moreover, you may form said recessed part 18 in a process different from a punching process.

A bending process is performed with respect to the metal plate material in which the punching process was performed. By executing this bending step, the core wire 13 is formed so as to extend in the direction in which the core wire 13 extends in a state where the core wire 13 is placed on the bottom plate 15, and the surface on the side on which the core wire 13 is placed has a concave shape. The part 19 and the connection cylinder part 20 formed in the direction corresponding to the direction where the core wire 13 is extended from the extension part 19 are formed (refer FIG. 4).
When executing the bending step, the projecting portions 19A and 19A projecting from both end portions 19F and 19F in the width direction of the extending portion 19 are bent inwardly (in the direction of the central axis of the terminal fitting piece 27), respectively. 20 is formed in a box shape.

  Subsequently, by engaging the feed hole 28 formed in the carrier 26 with the feed claw, the synthetic resin material is molded on the extending portion 19 of the terminal metal piece 27 while sequentially feeding the terminal metal piece 27. More specifically, first, a portion of the extended portion 19 where the water blocking wall 22 is to be formed is sandwiched by a pair of molds (not shown). Next, a molten synthetic resin material is injected into the cavity formed in the mold. After the synthetic resin material is solidified in the mold, the pair of molds are opened, and the terminal fitting piece 27 on which the water blocking wall 22 is formed is detached from the mold. The above process is continuously executed on the plurality of terminal metal pieces 27 connected to the carrier 26 at substantially constant intervals (see FIG. 5).

  On the other hand, the insulation coating 14 of the electric wire 11 is peeled to expose the core wire 13. Thereafter, the resin ring 23 is fitted on the end of the insulating coating 14. The resin ring 23 is externally fitted to a portion (a portion located on the side opposite to the core wire 13) of the insulating coating 14 that is different from the region to which the wire barrel 17 is crimped.

  Subsequently, a crimping process is performed on the terminal metal piece 27. More specifically, the core wire 13 and the insulation coating 14 exposed from the electric wire 11 are placed on the bottom plate 15 of the terminal fitting piece 27. Thereafter, the insulation barrel 16 and the wire barrel 17 are bent by a mold (not shown) so as to be held from the outside of the insulating coating 14 and the core wire 13, respectively. As a result, the insulation barrel 16 is crimped to the insulating coating 14, and the wire barrel 17 is crimped to the core wire 13.

  In the present embodiment, a cutting step for cutting the carrier 26 and the terminal metal piece 27 is performed simultaneously with the above-described crimping step. Accordingly, each terminal metal piece 27 is cut from the carrier 26 to be the female terminal metal 12, and the electric wire 10 with terminal metal is connected to the electric wire 11.

  Subsequently, a covering step is performed. More specifically, the heat-shrinkable tube 24 is inserted from the electric wire 11 side or the female terminal fitting 12 side, and disposed in a region from the water blocking wall 22 to the insulating coating 14 beyond the resin ring 23. By setting the inner diameter of the heat-shrinkable tube 24 to be larger than the outer shape of the connection cylinder portion 20 in a state before heating, the heat-shrinkable tube 24 can be inserted from the female terminal fitting 12 side relatively easily. Moreover, when inserting from the electric wire 11 side, the heat-shrinkable tube 24 may be inserted through the electric wire 11 in advance before performing the crimping process.

  After the heat-shrinkable tube 24 is inserted, the heat-shrinkable tube 24 is contracted by executing a heating process of heating with a heating device (not shown). Thereby, the inner surface of the heat shrinkable tube 24 is brought into close contact with the water blocking wall 22 and the resin ring 23 without a gap. The electric wire 10 with a terminal metal fitting is completed by the above.

  In the above heating process, by heating the connecting cylinder portion 20 in an upward orientation, even when the water blocking wall 22 is melted in the heating process, the synthetic resin material constituting the water blocking wall 22 is connected to the connecting cylinder. Inflow into the portion 20 can be suppressed. Thereby, the electrical connection reliability with the other party terminal metal fitting in the connection cylinder part 20 can be improved.

(Function, effect)
Then, the effect | action and effect of this embodiment are demonstrated. According to this embodiment, since the water blocking wall 22 is provided in the extension part 19, it can suppress that water permeates from the extension part 19 and water adheres to the core wire 13 and the wire barrel 17. . Furthermore, since the outer peripheral surface of the water blocking wall 22 is in close contact with the inner surface of the heat shrinkable tube 24 without any gap, water can enter from between the water blocking wall 22 and the heat shrinkable tube 24. Is also suppressed. Thus, the insulating coating 14 extends beyond the portion where the water blocking wall 22 is provided in the extended portion 19, the portion where the wire barrel 17, the insulation barrel 16 and the resin ring 23 are externally fitted, and further beyond the resin ring 23. Since the region up to is stopped by the heat-shrinkable tube 24, it is possible to reliably suppress water from adhering to the core wire 13 and the wire barrel 17.

  Further, according to the present embodiment, the resin ring 23 is fitted on the end portion of the insulating coating 14, and the inner surface of the heat shrinkable tube 24 is in close contact with the resin ring 23 without any gap. Thereby, since it can suppress reliably that water permeates from the edge part side of the insulation coating 14, it can suppress more reliably that water adheres to the core wire 13 and the wire barrel 17. FIG.

As described above, in this embodiment, since the water blocking wall 22 and the heat shrinkable tube 24 are provided, the intrusion of water from the extending portion 19 is suppressed, but the connecting cylinder of the extending portion 19 is used. Water may permeate from the gap between the end portion 19S on the portion 20 side (the end portion on the side opposite to the wire barrel 17 side) and the water blocking wall 22, and the water may adhere to the extension portion 19. .
Here, since the female terminal fitting 12 of the present embodiment is manufactured through a punching process in which a plated metal plate material is punched into a predetermined shape, the end surface is not plated and is oxidized more than other portions. (Corrosion) is easy to progress. Therefore, when the water that has entered from the gap between the extending portion 19 and the water blocking wall 22 adheres to the extending portion 19, corrosion occurs along the end surface 19C of the extending portion 19 as indicated by the arrow X in FIG. proceed.

  However, in the present embodiment, since the protruding portion 19A is formed at the end portion 19D in the width direction of the extending portion 10, the length of the end surface of the extending portion 19 is longer than that of the configuration without the protruding portion 10A. Is longer by the outer peripheral edge of the convex portion 19A. As a result, according to the present embodiment, since the corrosion path becomes longer, it is possible to delay the corrosion reaching the wire barrel 17.

  In particular, according to the present embodiment, the projecting portions 19A and 19A are formed at both end portions 19D and 19D in the width direction of the extending portion 19, respectively, so that the corrosion path is formed at both end portions 19D and 19D of the extending portion 19. Can be lengthened, and the strength of the extension 19 can be increased.

  By the way, when the metal which comprises the core wire 13 and the metal which comprises the female terminal metal fitting 12 differ, if water adheres over both the core wire 13 and the wire barrel 17, an electric corrosion will be carried out to the core wire 13 or the wire barrel 17. There are concerns about the occurrence. According to this embodiment, since the core wire 13 and the wire barrel 17 are reliably waterproofed by the heat shrinkable tube 24, the core wire 13 or the wire barrel 17 can be prevented from being melted by electrolytic corrosion.

  In particular, when the core wire 13 is made of aluminum or an aluminum alloy and the female terminal fitting 12 is formed with a tin plating layer on the surface of copper or a copper alloy as in the present embodiment, the aluminum having a relatively large ionization tendency. Alternatively, the core wire 13 made of an aluminum alloy is particularly effective because it may be dissolved by electrolytic corrosion. In addition, since the specific gravity of aluminum or aluminum alloy is relatively small, the electric wire 11 can be reduced in weight.

  In addition, according to the present embodiment, the water stop coating 25 includes the heat shrinkable tube 24. In the state before heating, the inner diameter of the heat-shrinkable tube 24 is relatively large, so that it can be easily disposed on the outer periphery of the region. Thereafter, by shrinking by heating, the inner surface of the heat shrinkable tube 24 can be brought into close contact with the water blocking wall 22 and the end of the insulating coating 14 without a gap. In this way, by using the heat shrinkable tube 24 as the water blocking coating 25, the work efficiency of the process of arranging the heat shrinkable tube 24 on the outer periphery of the region extending from the water blocking wall 22 to the end of the insulating coating 14 is improved. Can do.

  Further, since an adhesive layer or an adhesive layer is formed on the inner peripheral surface of the heat shrinkable tube 24, the heating process for shrinking the heat shrinkable tube 24 is performed, so that The water wall 22 can be securely adhered without a gap, and the heat shrinkable tube 24 and the end portion of the insulating coating 14 can be reliably adhered without a gap.

  As described above, by using the heat shrinkable tube 24 having the adhesive layer or the adhesive layer formed on the inner peripheral surface as the waterstop coating 25, the heat shrinkage is performed on the outer periphery of the region extending from the waterstop wall 22 to the end of the insulating coating 14. The working efficiency of the step of arranging the tube 24 can be improved, and the adhesion between the heat shrinkable tube 24 and the end portions of the water blocking wall 22 and the insulating coating 14 can be improved.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIGS. In the present embodiment, the embodiment is that the projecting portions 19A and 19A formed at both end portions 19D and 19D in the width direction of the extending portion 19 are formed with square holes 19B and 19B, respectively. 1 and different. Since the configuration other than the above is substantially the same as that of the first embodiment, the same members are denoted by the same reference numerals, and redundant description is omitted.

  In this embodiment, as shown in FIGS. 6 and 7, the water blocking wall 22 is formed so as to surround the outer periphery of the extending portion 19 over the entire periphery, and both end portions 19 </ b> D of the extending portion 19 are formed. The convex portions 19 </ b> A and 19 </ b> A formed in 19 </ b> D are accommodated inside the water blocking wall 22 in a state of being bent inward. As shown in FIGS. 8 and 9, square holes 19 </ b> B and 19 </ b> B are formed in the respective convex portions 19 </ b> A and 19 </ b> A.

Next, the operation and effect of this embodiment will be described.
According to the present embodiment, since the protruding portion 19A is formed in the extending portion 19, the length of the end surface of the extending portion 19 is larger than that of the configuration without the protruding portion 10A, as in the first embodiment. It is longer by the outer peripheral edge of the convex portion 19A. Therefore, the corrosion path (arrow Y in FIG. 7) also becomes longer according to this embodiment, so that the corrosion reaches the wire barrel 17 can be delayed.

  By the way, the corrosion of the terminal fitting 10 proceeds along the end face and also proceeds in the internal direction. Here, the progress of corrosion in the present embodiment (the extended portion 19 including the convex portion 19A in which the hole portion 19B is formed) and the corrosion in the extended portion 19 including the convex portion 19A in which the hole portion 19B is not formed. The progress will be described with reference to FIGS. 10 and 11. F1, F2 and F3 in FIG. 10 and FIG. 11 are lines indicating the range of corrosion, and the range of corrosion when the same time has passed is indicated by the same reference numerals in each figure.

In the present embodiment, as shown in FIG. 10, when the corrosion progresses inward from the end portion 19S on the connection tube portion side, the portion of the corrosion stops when it reaches the hole 19B (F2 in the figure). See). Thereafter, the corrosion progresses upward in FIG. 10 while avoiding the hole 19B (see F3), but the corrosion hardly reaches the end 19E on the wire barrel 17 side.
On the other hand, in the extension part 19 provided with the convex part 19A in which the hole part 19B is not formed, there is nothing that interrupts corrosion between the end part 19S on the connection tube part side and the end part 19E on the wire barrel 17 side. Therefore, as shown in FIG. 11, even after the corrosion has progressed to the range indicated by F2, the corrosion easily proceeds, and the corrosion reaches the vicinity of the end 19E on the wire barrel 17 side.

  As mentioned above, according to this embodiment, since the hole 19B is formed in the convex part 19A of the extension part 19, it can prevent that corrosion reaches the wire barrel 17. FIG.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIGS. The present embodiment is different from the first embodiment in that convex portions 19A and concave portions 19F are alternately formed at both end portions 19D and 19D in the width direction of the extending portion 19. Since the configuration other than the above is substantially the same as that of the first embodiment, the same members are denoted by the same reference numerals, and redundant description is omitted.

  In the present embodiment, convex portions 19A and concave portions 19F are alternately formed at both end portions 19D and 19D in the width direction of the extending portion 19, respectively. Specifically, the recessed portions 19F are respectively formed (three in total) between the four convex portions 19A.

  According to the present embodiment, since the protruding portions 19A and the recessed portions 19F are alternately formed at both ends 19D and 19D in the width direction of the extending portion 19, the length of the end surface of the extending portion 19 is determined. However, it is longer by the outer peripheral edge of the convex portion 19A and the recessed portion 19F than the configuration without the convex portion 10A and the recessed portion 19F. As a result, according to the present embodiment, the corrosion path (arrow line Z in FIG. 12) becomes longer, so that the corrosion reaches the wire barrel 17 can be delayed.

<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 present embodiment, the terminal fitting is the female terminal fitting 12, but is not limited thereto, and is a male having a male tab formed to extend further in the direction in which the core wire 13 extends from the extending portion 19. It may be a terminal metal fitting, or may be a so-called LA terminal in which a disk-like connection portion is formed continuously with the extension portion 19 and a through hole is formed in this connection portion. It may be a splice terminal in which a plurality of electric wires 11 are connected to another wire barrel 17 further formed in connection with the protruding portion 19, and a terminal fitting having an arbitrary shape can be formed as necessary.
(2) In the first embodiment, the cross-section of the water blocking wall 22 has a substantially square shape, but is not limited thereto, and may be a circular shape, an elliptical shape, an oval shape, or a polygonal shape such as a triangular shape. The shape may be sufficient, and it can be made into arbitrary shapes as needed.
(3) The water blocking coating 25 may be configured such that a sheet water blocking tape is wound around a region extending from the water blocking wall 22 to the end of the insulating coating 14.
(4) In this embodiment, the water blocking wall 22 is formed before the step of crimping the wire barrel 17 to the core wire 13. However, the present invention is not limited to this, and the water blocking wall 22 is a wire to the core wire 13. The barrel 17 may be formed after being crimped.
(5) In the present embodiment, the core wire 13 is made of aluminum or an aluminum alloy. However, the present invention is not limited to this, and the core wire 13 may be made of copper or a copper alloy. It is good also as a structure formed. In the present embodiment, the terminal fitting is made of copper or a copper alloy and a tin plating layer is formed on the surface. However, the present invention is not limited to this, and the terminal fitting is made of any metal as required. Also good.
Even when a metal plate material that is not plated is used as the material constituting the terminal fitting, the end face is more easily corroded than the other portions, so that the effects of the present invention can be obtained.
(6) In this embodiment, although it was set as the aspect which performs a crimping | compression-bonding process and a cutting process by the same process, it is not restricted to this, It is good also as a structure which performs a cutting process after performing a crimping | compression-bonding process.
(7) In this embodiment, the insulation barrel 16 is formed on the terminal fitting, but the insulation barrel 16 may be omitted.
(8) The water-stop coating 25 extends from the portion of the extended portion 19 where the water-stop wall 22 is formed to the portion where the wire barrel 17, the insulation barrel 16, and the resin ring 23 are fitted. It is good also as a structure covered.
(9) In the present embodiment, the resin ring 23 is configured to have an annular shape. However, the present invention is not limited to this. For example, the resin ring 23 is formed with a slit and has a substantially C-shaped cross section. Also good. As a result, the diameter of the resin ring 23 can be easily increased. For example, after the terminal fitting is crimped to the electric wire 11, the diameter of the resin ring 23 can be increased and externally fitted to the electric wire 11.
(10) In the present embodiment, at least one of the convex portion 19A and the concave portion 19F is formed on both ends 19D and 19D of the extending portion 19, but at least of the convex portion 19A and the concave portion 19F. One may be formed only on one end 19D.
(11) In the present embodiment, the heat shrinkable tube 24 is used as the water blocking coating 25, but an elastic tube may be used as the water blocking coating 25.

10 ... Electric wire with terminal fitting 11 ... Electric wire 12 ... Female terminal fitting (terminal fitting)
DESCRIPTION OF SYMBOLS 13 ... Core wire 14 ... Insulation coating 15 ... Bottom plate 17 ... Wire barrel 19 ... Extension part 19A ... Protrusion part 19B ... Hole part 19C ... End surface (of extension part) 19D ... End part (of extension part) 19F ... Depression part 22 ... Water stop wall 23 ... Resin ring 24 ... Heat shrinkable tube 25 ... Water stop coating 27 ... Terminal fitting piece X, Y, Z ... Corrosion path

Claims (12)

It is an electric wire with a terminal metal fitting in which the terminal metal fitting is connected to an electric wire formed by coating the outer periphery of the core wire with an insulation coating,
The terminal fitting comprises a wire barrel that is crimped to the core wire exposed from the end of the insulating coating, and an extending portion that extends from the bottom plate of the wire barrel,
The extension portion is provided with a water blocking wall formed by molding a synthetic resin, and the water blocking wall and the insulating coating are in close contact with the outer surface of the water blocking wall and the outer surface of the end portion of the insulating coating. A cylindrical water-stop coating is provided to cover the core wire between the end of the
At least one of a projecting portion protruding from the end portion and a recessed portion recessed from the end portion is formed at an end portion in the width direction of the extending portion. Electrical wire. The electric wire with terminal fitting according to claim 1, wherein the protrusions are formed at both ends of the extending portion in the width direction. The electric wire with terminal fitting according to claim 1 or 2, wherein a hole is formed in the convex portion. The electric wire with a terminal fitting according to any one of claims 1 to 3, wherein the water blocking wall is formed so as to surround the entire outer periphery of the extending portion. . The resin ring is externally fitted to the end of the insulating coating, and the inner surface of the water blocking coating is in close contact with the resin ring. Electric wire with terminal fitting as described. The electric wire with a terminal metal fitting according to any one of claims 1 to 5, wherein a metal constituting the core wire is different from a metal constituting the terminal metal fitting. The said core wire consists of aluminum or aluminum alloy, The electric wire with a terminal metal fitting as described in any one of Claim 1 thru | or 6 characterized by the above-mentioned. The electric wire with a terminal fitting according to any one of claims 1 to 7, wherein an adhesive layer or an adhesive layer is formed on an inner peripheral surface of the water blocking coating. The electric wire with terminal fitting according to any one of claims 1 to 8, wherein the water-stop coating is a heat-shrinkable tube or an elastic tube having rubber elasticity. A terminal fitting connected to the core wire exposed from an electric wire formed by coating the outer periphery of the core wire with an insulating coating,
The terminal fitting includes: a wire barrel that is crimped to the core wire exposed from the end of the insulating coating; and an extending portion that extends from a bottom plate of the wire barrel. The extending portion is molded with synthetic resin. A water blocking wall formed is provided, and the core wire is in close contact with the outer surface of the water blocking wall and the outer surface of the end portion of the insulating coating and between the water blocking wall and the end portion of the insulating coating. A cylindrical water-stop coating is provided to cover
The terminal fitting, wherein at least one of a protruding portion protruding from the end portion and a recessed portion recessed from the end portion is formed at an end portion in the width direction of the extending portion. The terminal fitting according to claim 10, wherein the projecting portions are respectively formed at both end portions of the extending portion in the width direction. The terminal fitting according to claim 10 or 11, wherein a hole is formed in the convex portion.

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