JP5510742B2 - Manufacturing method of terminal fitting, electric wire with terminal fitting, chain terminal and electric wire with terminal fitting - Google Patents

Description

  The present invention relates to a method of manufacturing a terminal fitting, an electric wire with terminal fitting, a chain terminal, and an electric wire with 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 was completed based on the above situations, Comprising: It aims at providing the manufacturing method of the terminal metal fitting excellent in waterproofness, an electric wire with a terminal metal fitting, a chain terminal, and an electric wire with a terminal metal fitting. .

  The present invention is an electric wire with a terminal fitting in which a terminal fitting is connected to an electric wire formed by coating an outer periphery of a core wire with an insulating coating, and the terminal fitting is exposed from an end of the insulating coating. A water barrier wall having a bottom plate placed and crimped to the core wire, and an extending portion extending from the bottom plate, and formed by molding a synthetic resin material on the extending portion, A cylindrical water stop coating is provided that covers the core wire in close contact with the outer surface of the water stop wall and between the water stop wall and the end portion of the insulating coating.

  The present invention is also a terminal fitting connected to an electric wire formed by coating an outer periphery of a core wire with an insulation coating, wherein the terminal fitting is mounted with the core wire exposed from an end portion of the insulation coating. A wire barrel that has a bottom plate and is crimped to the core wire, and an extending portion that extends from the bottom plate, is provided with a water blocking wall formed by molding a synthetic resin on the extending portion, and the wire In a state where the barrel is crimped to the core wire, the core wire is covered between the water blocking wall and the end of the insulating coating by a cylindrical water blocking coating, and the outer surface of the water blocking wall is Adheres to the inner surface of the waterproof coating.

  Further, the present invention is a chain terminal in which a plurality of terminal metal pieces are connected to a side edge of a carrier having a strip shape, and the terminal metal pieces are insulated and coated on an outer periphery of a core wire in a state of being cut from the carrier The terminal fitting piece has a bottom plate on which the core wire exposed from the end portion of the insulating coating is placed and the core wire is connected to the core wire exposed from the electric wire coated with A wire barrel that is crimped to the base plate, and an extending portion that extends from the bottom plate, and is provided with a water blocking wall formed by molding a synthetic resin on the extending portion, and the wire barrel is crimped to the core wire. In this state, the core wire is covered between the water blocking wall and the end of the insulating coating by a cylindrical water blocking coating, and the outer surface of the water blocking wall is connected to the inner surface of the water blocking coating. In close contact.

  According to the present invention, the outer surface of the water blocking wall formed in the extending portion is in close contact with the inner surface of the water blocking coating. Thereby, it is suppressed that water permeates from between the water blocking wall and the water blocking coating. As a result, it is possible to suppress water from adhering to the core wire and the wire barrel by the water stop coating covering the core wire between the water blocking wall and the end of the insulating coating.

As embodiments of the present invention, the following embodiments are preferable.
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.

  According to the above aspect, the water blocking wall can be in close contact with the inner surface of the water blocking coating over the entire circumference, so that the waterproof property can be further improved.

  The extension part is a groove part in which a surface connected to a surface of the bottom plate on which the core wire is placed has a concave shape, and the water blocking wall is formed by filling the groove part. Is preferred.

  According to said aspect, since the water stop wall is filled and formed in the groove part, it can suppress reliably that water adheres to the core wire mounted in the baseplate.

  It is preferable that an adhesive layer or an adhesive layer is formed on the inner peripheral surface of the water blocking coating.

  According to said aspect, the inner peripheral surface of a water stop coating | cover and the outer periphery of a water stop wall can be stuck closely.

  The waterstop coating is preferably a heat shrinkable tube.

  According to the above aspect, since the inner diameter of the heat-shrinkable tube is relatively large in a state before heating, it can be easily externally fitted in a region extending between the water blocking wall and the end portion of the insulating coating. it can. Thereafter, the inner surface of the heat-shrinkable tube can be brought into close contact with the outer surface of the water blocking wall by being contracted by heating. Thus, by using a heat-shrinkable tube as the water-stop coating, it is possible to improve the work efficiency of the process of fitting the heat-shrink tube in a region between the water blocking wall and the end of the insulating coating. .

  The water-stop coating is preferably an elastic tube having rubber elasticity.

  According to said aspect, in the state which expanded the diameter of the elastic tube, this elastic tube is externally fitted over between a water stop wall and the edge part of insulation coating, and an elastic tube is returned and deformed after that. Then, the inner surface of the elastic tube is in close contact with the outer surface of the water blocking wall. Thus, according to this aspect, the elastic tube can be covered in a region extending between the water blocking wall and the end portion of the insulating coating by a simple process.

  It is preferable that the inner peripheral surface of the waterproof coating is in close contact with the outer peripheral surface of the insulating coating.

  According to said aspect, since it can suppress that water permeates from between the water stop coating | cover and the outer surface of an insulation coating, it can suppress reliably that water adheres to a core wire and a wire barrel.

  A resin ring is externally fitted to the end of the insulating coating, an inner peripheral surface of the resin ring is in close contact with an outer peripheral surface of the insulating coating, and an outer peripheral surface of the resin ring is the waterproof coating. It is preferable to be in close contact with the inner peripheral surface.

  According to said aspect, between the edge part of insulation coating and a water stop coating is reliably sealed via a resin ring. Thereby, it can suppress reliably that water adheres to a core wire and a wire barrel.

  A cylindrical rubber elastic body is fitted on the end of the insulating coating, and the inner peripheral surface of the elastic body is in close contact with the outer peripheral surface of the insulating coating, and the outer periphery of the elastic body. The surface is preferably in close contact with the inner peripheral surface of the water blocking coating.

  According to said aspect, between the edge part of insulating coating and a water stop coating is reliably sealed via an elastic body. Thereby, it can suppress reliably that water adheres to a core wire and a wire barrel. Moreover, the elastic body can be brought into close contact with the end portion of the insulating coating by a simple method of fitting outside the end portion of the insulating coating in a state where the diameter of the elastic body is expanded and deforming, and then performing a return deformation.

  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 electrolytic corrosion in a core wire or a wire barrel. According to said aspect, since a core wire and a wire barrel are reliably waterproofed by a water stop material, it can suppress that a core wire or a wire barrel melt | dissolves 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.

  This is particularly effective in an embodiment in which the core wire is made of aluminum or an aluminum alloy. More specifically, the specific gravity of aluminum or aluminum alloy is relatively small, so that the electric wire can be reduced in weight. 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 material, it is especially effective when a core wire consists of aluminum or aluminum alloy.

  The present invention also relates to a method of manufacturing an electric wire with terminal fittings, 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 is formed into a strip shape by punching a metal plate into a predetermined shape. A carrier and a plurality of terminal metal pieces connected to the side edges of the carrier are formed, and the terminal metal piece is provided with a bottom plate on which the core wire exposed from the end of the insulating coating is placed. And a punching process for forming a wire barrel that is crimped to the core wire and an extending part extending from the bottom plate, and a molding process for forming a water blocking wall by molding a synthetic resin material on the extending part A crimping step of placing the core wire exposed from the insulating coating on the bottom plate and crimping the wire barrel; and cutting the terminal metal piece from the carrier to form the terminal metal The inner peripheral surface of the water blocking coating is brought into close contact with the outer surface of the water blocking wall by covering a cylindrical water blocking coating between the water blocking wall and the end of the insulating coating. And a covering step of covering the core wire with the waterproof coating.

  In general, when a synthetic resin material is injection-molded, it is more efficient to continuously inject-mold a plurality of molded products at regular intervals than to perform injection molding at irregular intervals. This is because a molten synthetic resin material is poured into a mold and then solidified, and a series of steps of detaching the molded product from the mold are continuously performed, so that the temperature condition of the mold, the synthetic resin This is because the injection conditions of the material can be stabilized. According to said manufacturing method, a water stop wall is formed by performing a molding process continuously with respect to several terminal metal fitting piece connected with the carrier. As a result, the working efficiency of the molding process can be improved.

  Furthermore, according to the present invention, the water blocking wall is formed in the molding process. Since the subsequent crimping step, cutting step, and covering step are general steps for manufacturing an electric wire with terminal fittings, an electric wire with terminal fittings can be produced without performing any special process. As a result, the core wire and the wire barrel can be waterproofed while suppressing an increase in manufacturing cost.

As embodiments of the present invention, the following embodiments are preferable.
It is preferable to perform a bending step of forming a groove portion by bending the surface on the core line side of the extending portion into a concave shape, and filling the groove portion with the synthetic resin material in the molding step.

  According to said aspect, since the water stop wall is filled and formed in the groove part, it can suppress reliably that water adheres to the core wire mounted in the baseplate.

  The cutting step is preferably performed in the same step as the crimping step.

  According to said aspect, work efficiency can be improved compared with the case where a cutting process and a crimping | compression-bonding process are performed in a different process.

  ADVANTAGE OF THE INVENTION According to this invention, the waterproofness of a terminal metal fitting and an electric wire with 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 view of main part showing wire with terminal fittings The principal part expanded sectional view which shows a groove 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 principal part expanded sectional view which shows the groove part of the electric wire with a terminal metal fitting which concerns on Embodiment 2 of this invention. The side view which shows the electric wire with a terminal metal fitting which concerns on Embodiment 3 of this invention Side sectional view which shows the electric wire with a terminal metal fitting concerning Embodiment 5 of the present invention. The principal part expanded sectional view which shows an extension part and a water stop wall The side view which shows the electric wire with a terminal metal fitting concerning Embodiment 6 of this invention Cutaway view of main part showing wire with terminal fittings The side view which shows the electric wire with a terminal metal fitting concerning Embodiment 7 of the present invention. The top view which shows the electric wire with a terminal metal fitting concerning Embodiment 8 of the present invention. Plan view showing the state before winding the waterproof tape

<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 10 with a terminal metal fitting according to the present embodiment is formed by connecting a female terminal metal fitting 12 (corresponding to the terminal metal fitting described in the claims) 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 insulating coating 14 so as to be held from the outside of the insulating coating 14 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.

  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 hole edges of the plurality of recesses 18 are in sliding contact with the surface of the core wire 13, the contact area between the hole edges of the recess 18 and the core wire 13 is increased. can do.

  The bottom plate 15 is formed with an extending portion 40 that further extends in the direction in which the core wire 13 extends. The extending portion 40 is a groove portion 19 in which a surface connected to the surface of the bottom plate 15 on the side where the core wire 13 is placed is formed in a concave shape. The groove portion 19 has a substantially U-shaped cross section and opens upward. In addition, as a cross-sectional shape of the groove part 19, it is good also as a semicircle shape, for example, and it can be made into arbitrary shapes as needed.

  The groove portion 19 is formed with a connecting tube portion 20 that further extends in the direction in which the core wire 13 extends to form a tubular 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)
A water blocking wall 22 is formed in the groove portion 19 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 by filling the groove portion 19. Furthermore, the water blocking wall 22 is formed so as to surround the outer periphery of the groove portion 19 over the entire periphery. 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)
A tubular waterproof coating 25 that covers the core wire 13 is provided between the waterproof wall 22 and the end of the insulating coating 14. Specifically, the insulating portion 22 is insulated from the portion where the water blocking wall 22 is formed in the groove portion 19, the portion where the core wire 13, the wire barrel 17, the insulation barrel 16 and the resin ring 23 are externally fitted, and further beyond the resin ring 23. The region up to the end of the coating 14 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 the state where the heat-shrinkable tube 24 is heated and contracted, and on the outer peripheral surface and the entire periphery of the resin ring 23. It is in close contact with no gap.

  As the synthetic resin material constituting the water blocking wall 22, a material that exhibits adhesiveness when heated and softened or melted may be used. In this case, the water blocking wall 22 can be softened or melted in the same step as the step of heating the heat shrinkable tube 24 to bond the inner surface of the heat shrinkable tube 24 and the water blocking wall 22.

  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 same process as the process of heating the heat shrinkable tube 24, the resin ring 23 can be softened or melted, and the inner surface of the heat shrinkable tube 24 and the resin ring 23 can be bonded. 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 that is crimped to the base plate 15, and an extending portion 40 that extends from the bottom plate 15.

  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 performing this bending step, the core wire 13 is formed in the portion corresponding to the extending portion 40 so as to extend in the direction in which the core wire 13 extends in the state where the core wire 13 is placed on the bottom plate 15. A groove portion 19 is formed in which the surface on the formed side has a concave shape. Further, a connecting cylinder portion 20 is formed which extends from the groove portion 19 in a direction corresponding to the direction in which the core wire 13 extends (see FIG. 4).

  Subsequently, the synthetic resin material is molded into the groove portion 19 of the terminal fitting piece 27 while sequentially feeding the terminal fitting pieces 27 by engaging the feeding holes 28 formed in the carrier 26 with the feeding claws. More specifically, first, a portion of the groove portion 19 where the water blocking wall 22 is to be formed is sandwiched from above and below 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). Thereby, the chain terminal 41 is formed.

  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 process for cutting the carrier 26 and the terminal metal piece 27 is performed in the same process as the above-described crimping process. 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 outer surfaces of the water blocking wall 22 and the resin ring 23 without a gap. The heat-shrinkable tube 24 is in close contact with the end of the insulating coating 14 at a position behind 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 the present embodiment, the water blocking wall 22 is formed on the extended portion 40 extended from the bottom plate 15 of the wire barrel 17. In the present embodiment, the extending portion 40 is the groove portion 19, and the water blocking wall 22 is formed by filling the groove portion 19. Thereby, it can suppress that water permeates from the groove 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. As a result, the portion of the groove 19 where the water blocking wall 22 is formed, 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 to the insulating coating 14. Since the area up to this point 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 resin ring 23 is in close contact with the outer surface of the insulating coating 14 without a gap. Further, 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.

  When the metal constituting the core wire 13 and the metal constituting the female terminal fitting 12 are different, if water adheres to both the core wire 13 and the wire barrel 17, electrolytic corrosion occurs in the core wire 13 or the wire barrel 17. There is concern. 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.

  In general, when a synthetic resin material is injection-molded, it is more efficient to continuously inject-mold a plurality of molded articles at regular intervals than to perform injection molding at irregular intervals. This is because a molten synthetic resin material is poured into a mold and then solidified, and a series of steps of detaching the molded product from the mold are continuously performed, so that the temperature condition of the mold, the synthetic resin This is because the injection conditions of the material can be stabilized. According to the present embodiment, the water blocking wall 22 is formed by continuously performing a molding process on the plurality of terminal fitting pieces 27 connected to the carrier 26. As a result, the working efficiency of the molding process can be improved.

  Further, according to the present embodiment, the water blocking wall 22 is formed in the molding process. That is, in the present embodiment, the water blocking wall 22 is formed when the chain terminal 41 is formed. Thereby, since the subsequent crimping | compression-bonding process, a cutting process, and a covering process are general processes, the electric wire 10 with a terminal metal fitting can be manufactured, without requiring a special process. As a result, waterproofing of the core wire 13 and the wire barrel 17 can be achieved while suppressing an increase in manufacturing cost.

  Moreover, in this embodiment, a cutting process is performed in the same process as a crimping | compression-bonding process. Thereby, compared with the case where a cutting process and a crimping | compression-bonding process are performed in a different process, work efficiency can be improved.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. In the present embodiment, the water blocking wall 22 is filled in the groove portion 19 and does not cover the outer periphery of the groove portion 19. In addition, the water blocking wall 22 is formed so as to rise above the side edge constituting the groove 19. The inner surface of the heat-shrinkable tube 24 is in close contact with the water blocking wall 22 without any gap and is in close contact with the outer peripheral surface of the groove 19 without any gap. 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.

  According to the present embodiment, since the water blocking wall 22 is filled in the groove portion 19, it is possible to prevent water from entering from the groove portion 19 and attaching water to the core wire 13 and the wire barrel 17. Further, the inner surface of the heat shrinkable tube 24 is in close contact with the water blocking wall 22 without any gap, and is in close contact with the outer peripheral surface of the groove portion 19 without any gap, so that the heat shrinkable tube 24, the groove portion 19 and the water blocking wall 22 are Water can be prevented from entering from the gap.

  Moreover, according to this embodiment, since the quantity of the synthetic resin material which comprises the water stop wall 22 can be reduced, manufacturing cost can be reduced.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG. In the present embodiment, the resin ring 23 is omitted. The heat shrinkable tube 24 is covered with a region from the portion where the water blocking wall 22 is formed in the groove portion 19 to the end of the wire barrel 17, the insulation barrel 16, and the insulating coating 14. The inner surface of the heat shrinkable tube 24 is in close contact with the outer surface of the insulating coating 14. 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.

  According to the present embodiment, the region from the portion of the groove 19 where the water blocking wall 22 is formed to the end of the wire barrel 17, the insulation barrel 16, and the insulating coating 14 is formed by the heat shrinkable tube 24. Waterproof. Thereby, it can suppress that water adheres to the core wire 13 and the wire barrel 17.

  Moreover, according to this embodiment, since the resin ring 23 becomes unnecessary, the number of parts can be reduced. Furthermore, since the process of externally fitting the resin ring 23 to the end of the electric wire 11 is not necessary, the manufacturing process can be reduced.

  Further, when the heat shrinkable tube 24 having an adhesive layer formed on the inner peripheral surface is used, the adhesive layer is melted and bonded during the heat shrinkage, and the heat shrinkable tube 24, the insulating coating 14, and the water blocking wall 22 are connected. It is possible to further suppress water from entering from the gap.

<Embodiment 4>
In the present embodiment, an elastic tube having rubber elasticity is used as the water blocking coating 25. The inner diameter of the elastic tube in the natural state is set to be smaller than the outer diameter of the water blocking wall 22 and the outer diameter of the insulating coating 14. Since the configuration other than the above is substantially the same as that of the third embodiment, the same members are denoted by the same reference numerals, and redundant description is omitted.

  In the covering step of covering the female terminal fitting 12 with the elastic tube, first, with the diameter of the elastic tube expanded, the elastic tube is inserted from the electric wire 11 side or the female terminal fitting 12 side, over the resin ring 23 from the water blocking wall 22. And disposed in a region reaching the insulating coating 14. Thereafter, the elastic tube is returned and deformed. Then, the inner surface of the elastic tube is in close contact with the region from the water blocking wall 22 to the end of the insulating coating 14. As described above, according to this aspect, it is possible to suppress water intrusion from the boundary between the elastic tube, the water blocking wall 22 and the insulating coating 14 by a simple process in which the elastic tube is disposed at a predetermined position and then deformed to return. . For this reason, the heating process required when the heat-shrinkable tube 24 is used as the water-stop coating 25 becomes unnecessary, so that the manufacturing cost can be reduced.

<Embodiment 5>
Next, a fifth embodiment of the present invention will be described with reference to FIGS. The terminal fitting according to the present embodiment is a male terminal fitting 50. In the present embodiment, the extending portion 51 extending from the bottom plate 15 has a flat plate shape. The water blocking wall 52 is formed so as to cover the extended portion 51 over the entire circumference. The cross-sectional shape of the water blocking wall 52 has a quadrangular shape with four rounded corners. A male tab 53 extends in the direction in which the core wire 13 extends from the extending portion 51. The male tab 53 is electrically connected to a mating terminal fitting (not shown).

  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.

  According to the present embodiment, even when the extending portion 51 extending from the bottom plate 15 has a flat plate shape, the outer surface of the water blocking wall 52 and the inner surface of the water blocking coating 25 are in close contact with each other. It is possible to prevent water from entering between the extension portion 51 and the extension portion 51. As a result, the core wire 13 and the wire barrel 17 can be waterproofed.

<Embodiment 6>
Subsequently, Embodiment 6 of the present invention will be described with reference to FIGS. 10 and 11. In the present embodiment, a rubber elastic body 70 having a cylindrical shape is externally fitted to the end of the insulating coating 14. The inner surface of the elastic body 70 is in close contact with the outer surface of the insulating coating 14. Further, the outer surface of the elastic body 70 is in close contact with the inner surface of the waterproof coating 25.

  The elastic body 70 can be formed of any rubber such as NBR or silicone rubber as required. The elastic body 70 may be a rubber tube formed by cutting an elongated rubber tube into a predetermined length. The elastic body 70 may be a so-called rubber plug formed by injecting molten rubber into a mold (not shown). It is good also as a structure by which the lip which protrudes in the circumferential direction is formed in the outer surface of a rubber stopper.

  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.

  According to this embodiment, it is suppressed that water permeates from between the water stop coating 25 and the end of the insulating coating 14. As a result, the waterproofness of the core wire 13 and the wire barrel 17 can be improved.

  In the present embodiment, the elastic body 70 is configured to be covered with the water blocking coating 25 and disposed inside the water blocking coating 25, but is not limited to this, and among the ends of the elastic body 70, An end portion (right end portion in FIG. 10) located on the side opposite to the insulation barrel 16 may be exposed to the outside from the end portion of the water blocking coating 25.

<Embodiment 7>
Subsequently, Embodiment 7 of the present invention will be described with reference to FIG. In the present embodiment, the insulation barrel 16 is crimped around the outer side of the elastic body 70 disposed at the end of the insulating coating 14. Since the configuration other than the above is substantially the same as that of the seventh embodiment, the same members are denoted by the same reference numerals, and redundant description is omitted.

  According to this embodiment, since the insulation barrel 16 is pressure-bonded to the outside of the elastic body 70, the adhesion between the inner surface of the elastic body 70 and the outer surface of the insulating coating 14 is improved. Further, it is possible to suppress the displacement of the elastic body 70. Thereby, it can suppress reliably that water permeates from between the water stop coating 25 and the insulating coating 14.

  In the present embodiment, the elastic body 70 is covered with the water blocking coating 25 and is arranged inside the water blocking coating 25. The end portion (the right end portion in FIG. 12) located on the opposite side of the insulation barrel 16 may be configured to be exposed outward from the end portion of the water blocking coating 25.

<Eighth embodiment>
Next, an eighth embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the waterproof coating 25 is formed in a tubular shape as a whole by winding a sheet of waterproof tape 80 in a region from the waterproof wall 22 to the end of the insulating coating 14. It is said. As the water-stopping tape 80, an adhesive tape in which an adhesive layer (not shown) is formed or an adhesive tape in which an adhesive layer (not shown) is formed can be used. The waterproof tape 80 is wound with the adhesive layer or the pressure-sensitive adhesive layer inside. Moreover, as the waterproofing tape 80, a well-known self-bonding tape can be used.

  Since the configuration other than the above is substantially the same as that of the third embodiment, the same members are denoted by the same reference numerals, and redundant description is omitted.

  According to the present embodiment, the core wire 13 and the wire barrel 17 can be waterproofed by a simple method of winding the sheet-like water-stopping tape 80.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) The terminal fitting may be a so-called LA terminal in which a disk-shaped connecting portion is formed continuously with the extending portion 40 and a through hole is formed in the connecting portion, and may be arbitrarily selected as necessary. It can be set as the terminal metal fitting of the shape.
(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) In the present 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.
(4) 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.
(5) In this embodiment, although it was set as the aspect which performs a crimping | compression-bonding process and a cutting process in 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.
(6) Although the insulation barrel 16 is formed on the terminal fitting in the present embodiment, the insulation barrel 16 may be omitted.
(7) The water stop coating 25 covers a region from the portion of the groove 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 externally fitted. It is good also as a structure.
(8) 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 ... 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 ... Groove part 22, 52 ... Water stop wall 23 ... Resin ring 24 ... Heat shrinkable tube 25 ... Water stop coating 26 ... Carrier 27 ... Terminal metal fitting piece 40, 51 ... Extension part 41 ... Chain terminal 50 ... Male terminal fitting (terminal fitting)
60 ... Splice terminal (terminal fitting)
70 ... Elastic body 80 ... Water stop tape

Claims (20)

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 includes a bottom plate on which the core wire exposed from the end portion of the insulating coating is placed, and a wire barrel that is crimped to the core wire, and an extending portion that extends from the bottom plate. ,
The extension part is provided with a water stop wall formed by molding a synthetic resin material, and is in close contact with the outer surface of the water stop wall and extends between the water stop wall and the end of the insulating coating. An electric wire with terminal fittings that is provided with a cylindrical water-stop coating. The electric wire with a terminal fitting according to claim 1, wherein the water blocking wall is formed so as to surround the outer periphery of the extending portion over the entire circumference. The extension part is a groove part in which a surface connected to the surface of the bottom plate on which the core wire is placed has a concave shape, and the water blocking wall is formed by filling the groove part. Claim | item 1 or the electric wire with a terminal metal fitting of Claim 2. The electric wire with a terminal metal fitting according to any one of claims 1 to 3, 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 4, wherein the water-stop coating is a heat-shrinkable tube. The electric wire with a terminal metal fitting according to any one of claims 1 to 4, wherein the water-stop coating is an elastic tube having rubber elasticity. The electric wire with a terminal fitting according to any one of claims 1 to 6, wherein an inner peripheral surface of the waterproof coating is in close contact with an outer peripheral surface of the insulating coating. A resin ring is externally fitted to the end of the insulating coating, an inner peripheral surface of the resin ring is in close contact with an outer peripheral surface of the insulating coating, and an outer peripheral surface of the resin ring is the waterproof coating. The electric wire with a terminal metal fitting according to any one of claims 1 to 7, which is in close contact with an inner peripheral surface. A cylindrical rubber elastic body is fitted on the end of the insulating coating, and the inner peripheral surface of the elastic body is in close contact with the outer peripheral surface of the insulating coating, and the outer periphery of the elastic body. The electric wire with a terminal fitting according to any one of claims 1 to 8, wherein the surface is in close contact with the inner peripheral surface of the water blocking coating. The electric wire with a terminal metal fitting as described in any one of Claims 1 thru | or 9 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 fitting according to any one of claims 1 to 10, wherein the core wire is made of aluminum or an aluminum alloy. A terminal fitting connected to an electric wire formed by coating the outer periphery of a core wire with an insulation coating,
The terminal fitting includes a bottom plate on which the core wire exposed from the end portion of the insulating coating is placed, and a wire barrel that is crimped to the core wire, and an extending portion that extends from the bottom plate. ,
A water blocking wall formed by molding a synthetic resin material on the extension part is provided,
In a state where the wire barrel is crimped to the core wire, the core wire is covered between the water blocking wall and the end of the insulating coating by a cylindrical water blocking coating, and the outer surface of the water blocking wall Is a terminal fitting that is in close contact with the inner surface of the waterproof coating. The terminal fitting according to claim 12, wherein the water blocking wall is formed so as to surround the outer periphery of the extending portion over the entire periphery. The extension part is a groove part in which a surface connected to a surface of the bottom plate on which the core wire is placed has a concave shape, and the water blocking wall is formed by filling the groove part. The terminal fitting according to Item 12 or Claim 13. A chain terminal in which a plurality of terminal metal pieces are connected to a side edge of a carrier having a band shape,
The terminal fitting piece is connected to the core wire exposed from the electric wire formed by covering the outer periphery of the core wire with an insulating coating in a state where the terminal metal piece is cut from the carrier,
The terminal fitting piece includes a bottom plate on which the core wire exposed from the end portion of the insulating coating is placed, a wire barrel that is crimped to the core wire, and an extending portion that extends from the bottom plate. And
A water blocking wall formed by molding a synthetic resin material on the extension part is provided,
In a state where the wire barrel is crimped to the core wire, the core wire is covered between the water blocking wall and the end of the insulating coating by a cylindrical water blocking coating, and the outer surface of the water blocking wall Is a chain terminal that is in close contact with the inner surface of the waterproof coating. The chain terminal according to claim 15, wherein the water blocking wall is formed so as to surround the outer periphery of the extension part over the entire periphery. The extension part is a groove part in which a surface connected to a surface of the bottom plate on which the core wire is placed has a concave shape, and the water blocking wall is formed by filling the groove part. Item 17. The chain terminal according to item 15 or 16. A method of manufacturing a wire with a terminal fitting, wherein a terminal fitting is connected to an electric wire formed by coating an outer periphery of a core wire with an insulation coating,
A metal plate is punched into a predetermined shape to form a band-shaped carrier and a plurality of terminal metal pieces connected to the side edges of the carrier, and the terminal metal piece has an end portion of the insulating coating. A punching step for forming a wire barrel having a bottom plate on which the core wire exposed from the substrate is placed and being crimped to the core wire, and an extending portion extending from the bottom plate;
A molding step of forming a water blocking wall by molding a synthetic resin material in the extension part;
A crimping step of placing the core wire exposed from the insulating coating on the bottom plate and crimping the wire barrel;
Cutting the terminal fitting piece from the carrier to form the terminal fitting;
By covering the water blocking wall and the end of the insulating coating with a cylindrical water blocking coating, the inner peripheral surface of the water blocking coating is brought into close contact with the outer surface of the water blocking wall, and And a covering step of covering the core wire with a water-stop coating. Performing a bending step of forming a groove portion by bending the surface on the core wire side of the extending portion into a concave shape;
The manufacturing method of the electric wire with a terminal metal fitting of Claim 18 which fills the said synthetic resin material in the said groove part in the said mold process. The said cutting process is a manufacturing method of the electric wire with a terminal metal fitting of Claim 18 or Claim 19 performed in the process same as the said crimping | compression-bonding process.

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