JP2012059526A - Electric wire with terminal fitting, and terminal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal fitting with excellent waterproofness, and an electric wire with the terminal fitting.SOLUTION: In an electric wire with a terminal fitting made by connecting the terminal fitting to the electric wire, the terminal fitting comprises a connecting portion 20 connected to a counterpart side terminal fitting, a wire barrel 17 press-contacted to a core wire 13, and a linking portion 19 connecting the connecting portion 20 and the wire barrel 17. The linking portion 19 is provided with a cut-off wall 22 made by molding a synthetic resin. A cylindrical thermal shrinkage tube 24 is provided over an outer surface of the cut-off wall 22 and an outer surface of an end portion of an insulation coating 14 to cover the core wire 13, by sticking to the outer surface of the cut-off wall 22 and the outer surface of the end portion of the insulation coating 14. The cut-off wall 22 is integrally provided with a continuously arranging portion 25 extending along an outer surface of the linking portion 19, and the continuously arranging portion 25 can be warped and deformed.

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 plate-like substrate portion on which a core wire is placed, and a wire barrel that protrudes from the substrate 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, there is a concern that problems such as oxidation of the surface of the core wire or the wire barrel may occur.

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

  As a means for solving 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 connected to a conductive member. A connecting portion; a wire barrel that is crimped to the core wire exposed from the end portion of the insulating coating; and a connecting portion that connects the connecting portion and the wire barrel, and is combined with the connecting portion. A water blocking wall formed by molding resin is provided, and 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 extends between the water blocking wall and the end portion of the insulating coating. A cylindrical water-stop coating covering the core wire is provided, and the water-stop wall includes a continuous portion that is connected to the water-stop wall and extends toward the wire barrel along the outer surface of the connecting portion. It is provided integrally, and this connecting part is orthogonal to the direction in which the core wire extends That the area occupied by the resin that is set narrower than the area occupied by the resin in the cross section of the cut-off wall, and is capable flexural deformation in the cross section.

  The present invention also provides 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, wherein the terminal fitting is connected to a conductive member, and the insulation A wire barrel that is crimped to the core wire exposed from the end of the coating, and a connecting portion that connects the connecting portion and the wire barrel, and is formed by molding a synthetic resin on the connecting portion. A cylindrical shape provided with a water blocking wall and covering the core wire between the water blocking wall and the end of the insulating coating in close contact with the outer surface of the water blocking wall and the outer surface of the end of the insulating coating The water blocking wall is integrally formed with a continuous portion that is connected to the water blocking wall and extends toward the wire barrel along the outer surface of the connecting portion. The connecting portion is in a cross section perpendicular to the direction in which the core wire extends. The area occupied by the resin is resiliently deformable by being set narrower than the area occupied by the resin in the cross section of the water-stop wall.

  According to such a structure, since the water stop wall is provided in the connection part, it can suppress that water permeates from between a connection part and a water stop wall. Furthermore, since the water blocking coating is in close contact with the outer surface of the water blocking wall, it is possible to prevent water from entering from between the water blocking coating and the outer surface of the water blocking wall. 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.

  In addition to the water blocking wall, the connecting portion extends to the wire barrel side and is provided integrally with the water blocking wall, so that the connecting portion and the synthetic resin constituting the water blocking wall and the connecting portion are connected to the connecting portion. The length dimension of the interface can be set longer in the direction extending from the connecting portion side to the wire barrel side than in the case where the continuous portion is not formed. Thereby, even when a connection part is eroded from the connection part side with water etc., time until water reaches a core line can be lengthened.

  In addition, when the wire barrel is strongly caulked and crimped to the core wire, the peripheral portion on the wire barrel side in the connecting portion may be bent and deformed following the deformation of the wire barrel. In this case, when the connecting portion receives stress due to deformation of the connecting portion, the resin layer of the connecting portion is damaged or the resin layer is easily peeled off from the connecting portion. In this respect, according to the present invention, the area occupied by the resin in the cross section of the continuous portion is set to be narrower than the area occupied by the resin in the cross section of the water blocking wall, so the continuous portion follows the deformation of the wire barrel. And can be bent and deformed. Thereby, it can suppress that the resin layer of a connection part breaks or a resin layer peels from a connection part.

The following configuration is desirable as an embodiment of the present invention.
The connecting portion is provided in a concave shape including a bottom plate and a pair of side plates rising from both side edges of the bottom plate to the core wire side, and the connecting portion is provided on an outer surface of the bottom plate and an outer surface of the pair of side plates. It is good also as a structure formed in groove shape along.

  When the wire barrel is strongly caulked and crimped to the core wire, the pair of side plates of the connecting portion may be bent and deformed to the core wire side following the deformation of the wire barrel. In this respect, according to the present invention, since the resin layer of the connecting portion is formed in a groove shape along the outer surface of the connecting portion, the portion formed along the both side plates in the connecting portion is deformed by the wire barrel. It can follow and bend and deform to the core side. Thereby, it can suppress that the resin layer of a connection part breaks or peels from a connection part. In addition, since the continuous portion is formed in a groove shape, the mold can be opened in a direction orthogonal to the direction in which the core wire extends when the molding die is opened after the continuous portion is molded. Thereby, the shape of the molding die can be simplified, and the cost of the molding die can be reduced.

The said connection part is good also as a structure which is opened and formed in the said wire barrel side, and the said core wire can be accommodated.
According to such a configuration, when the core wire is strongly compressed when the wire barrel is crimped, the tip of the core wire can be accommodated in the connecting portion when the core wire extends forward. Thereby, it can suppress that a core wire presses the rear surface of a connection part, and a connection part is damaged.

It is good also as a structure by which the guide surface which becomes wide toward the said wire barrel side is formed in the opening edge by the side of the said wire barrel in the said connection part.
According to such a structure, a core wire can be smoothly guided to a connection part by a guide surface.
The water blocking wall may be configured to further surround the outer periphery of the connecting portion over the entire periphery.
According to such a configuration, 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.
A resin ring may be externally fitted to the end portion of the insulating coating, and the inner surface of the water blocking coating may be in close contact with the resin ring.
According to such a configuration, since the outer surface of the waterproof coating is uneven, the waterproof coating is easily caught by the insulating coating, and the inner surface of the waterproof coating and the outer surface of the end portion of the insulating coating are brought into close contact with each other without any gap. be able to.
It is good also as a structure from which the metal which comprises the said core wire differs from the metal which comprises the said terminal metal fitting.
When the metal constituting the core wire is different from the metal constituting the terminal fitting, if water adheres to both the core wire and the wire barrel, there is a concern that galvanic corrosion may occur on the core wire or the wire barrel. However, according to such a configuration, 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.
The core wire may be made of aluminum or an aluminum alloy.
According to such a configuration, since the specific gravity of aluminum or aluminum alloy is relatively small, 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 good also as a structure by which the contact bonding layer or the adhesion layer is formed in the internal peripheral surface of the said water stop coating.
According to such a configuration, the inner peripheral surface of the water blocking coating and the region extending from the water blocking wall to the end of the insulating coating can be brought into close contact with each other without a gap.
The waterproof coating may be a heat shrinkable tube.
According to such a configuration, since the inner diameter of the heat-shrinkable tube is relatively large before heating, the outer periphery of the region can be easily covered with the heat-shrinkable tube. Thereafter, the inner surface of the heat-shrinkable tube can be brought into close contact with the outer surface of the water blocking wall and the outer surface of the end portion of the insulating coating by being contracted 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.
The waterstop coating may be an elastic tube having rubber elasticity.
According to such a configuration, in a state where the diameter of the elastic tube is expanded, 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, and then the elastic tube is restored and deformed. Then, the inner surface of the elastic tube 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. 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 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 Plan view Cutaway cross-sectional view of the main part showing an electric wire with terminal fittings The principal part expanded sectional view which shows a still water wall Expanded cross-sectional view of the main part showing the connection section The top view which shows the state which the bending process was complete | finished Plan view showing the state after the molding process The top view which shows the terminal metal fitting which concerns on Embodiment 1 of this invention. The principal part expanded sectional view which shows the connection part of the electric wire with a terminal metal fitting which concerns on Embodiment 2 of this invention. The top view which shows the electric wire with a terminal metal fitting which concerns on Embodiment 3 of this invention

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS.
The electric wire with terminal fitting 10 according to the present embodiment includes an electric wire 11 and a female terminal fitting 12 (corresponding to the terminal fitting described in the claims) connected to the end of the electric wire 11.

(Wire 11)
The electric wire 11 includes a 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. As shown in FIG. 3, 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)
As shown in FIG. 1, the female terminal fitting 12 has a rectangular tube-shaped connecting portion 20, a wire barrel 17 formed behind the connecting portion 20 via a connecting portion 19, and a position further rearward of the wire barrel 17. And an insulation barrel 16 to be configured.
The female terminal fitting 12 is formed by pressing a metal plate into a predetermined shape.
The connection part 20 is provided with an elastic contact piece 21 that can be elastically connected to a male terminal fitting (not shown) inserted from the front of the connection part 20 therein.

  The wire barrel 17 includes a first bottom plate 17A on which the core wire 13 exposed from the electric wire 11 is placed, and a pair of wire barrel pieces 17B and 17B that rise upward in an opposing state from both side edges of the first bottom plate 17A. It is configured. As shown in FIG. 3, the wire barrel 17 has the core wire 13 between the wire barrel pieces 17B and 17B and the first bottom plate 17A in a state where the core wire 13 of the electric wire 11 is placed on the first bottom plate 17A. The wire barrel 17 is crimped to the core wire 13 by caulking.

As shown in FIG. 6, a plurality of recesses 18 are formed on the crimping surface of the wire barrel 17 that is crimped by both the wire barrel pieces 17 </ b> B and 17 </ b> B, that is, the surface that comes into contact with the core wire 13 along with the crimping. Yes. The concave portion 18 has a substantially quadrangular shape, and specifically has a substantially parallelogram shape. Moreover, since the pair of recesses 18 adjacent to each other in the direction in which the core wire 13 extends (front-rear direction) are arranged in an overlapping manner in the front-rear direction, the entire region in the direction orthogonal to the direction in which the core wire 13 extends (width direction). The core wire 13 can be crimped. Therefore, the adhering force between the core wire 13 and the wire barrel 17 can be improved.
Further, since the rims of the plurality of recesses 18 come into sliding contact with the surface of the core wire 13 along with the crimping, the rims of the recesses 18 contact the core wire 13 through the insulating oxide film formed on the surface of the core wire 13. Will do. Therefore, the contact area between the lip of the recess 18 and the core wire 13 is increased, so that the electrical resistance value between the female terminal fitting 12 and the core wire 13 can be lowered.

The insulation barrel 16 extends rearward of the first bottom plate 17A of the wire barrel 17 and is opposed to the second bottom plate 16A on which the insulating coating 14 of the electric wire 11 is placed and both side edges of the second bottom plate 16A. And a pair of insulation barrel pieces 16B, 16B rising upward.
As shown in FIG. 3, the insulation barrel 16 is insulated in a so-called overlap type by holding it from the outside of the insulation coating 14 in a state where the insulation coating 14 of the electric wire 11 is placed on the second bottom plate 16A. The cover 14 is crimped and crimped.
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.

(Join 19)
As shown in FIG. 4, the connecting portion 19 has an upper surface on the side where the core wire 13 is placed bent into a concave shape, and has a substantially U-shaped cross section. The connecting portion 19 includes a bottom plate 19A that extends rearward from the connecting portion 20 and a pair of side plates 19B and 19B that rise upward from both side edges of the bottom plate 19A. Both side plates 19B and 19B are formed to be connected to both wire barrel pieces 17B and 17B, respectively. In addition, as a cross-sectional shape of the connection part 19, it may be a semicircular shape, for example, and can be made into arbitrary shapes as needed.

(Water blocking wall 22)
The connecting portion 19 is provided with a water blocking wall 22 formed by molding a synthetic resin. As the synthetic resin constituting 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 can be used. As for said synthetic resin, only 1 type may be used and multiple types of synthetic resin may be mixed and used. In the present embodiment, a polyamide-based thermoplastic resin is used.
As shown in FIG. 4, the water blocking wall 22 is formed so as to surround the outer periphery of the connecting portion 19 over the entire periphery. That is, a portion corresponding to the water blocking wall 22 in the connecting portion 19 is embedded in the water blocking wall 22. Moreover, the cross-sectional shape of the water blocking wall 22 has a substantially rectangular shape with rounded corners.

(Resin ring 23)
A resin ring 23 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 on the insulating coating 14 so as to be in close contact with the entire circumference. The inner diameter of the resin ring 23 is set to be substantially the same as the outer diameter of the insulating coating 14. Here, “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 insulating coating 14. Thereby, the resin ring 23 can be easily fitted on the end of the electric wire 11.
As a 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 or a synthetic rubber may be used. Any synthetic resin material can be used depending on the case. 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.

(Heat shrink tube 24)
The area from the water blocking wall 22 to the wire barrel 17, the insulation barrel 16, the resin ring 23, and the region from the resin ring 23 to the insulation coating 14, as shown in FIG. It is covered with a heat-shrinkable tube 24 (corresponding to the waterproof coating described in the claims) made of resin. 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 in the front-rear direction is set to a length dimension that can cover the region from the end of the water blocking wall 22 on the connection portion 20 side to the position where the resin ring 23 is externally fitted. ing.

The inner peripheral surface of the heat-shrinkable tube 24 is in close contact with the outer peripheral surface of the water blocking wall 22 without a gap in a state where the heat-shrinkable tube 24 is heated and contracted. Further, the inner peripheral 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 constituting the water blocking wall 22, a resin that exhibits adhesiveness by being softened or melted by heating may be used. In this case, in the step of heating the heat shrinkable tube 24, the water blocking wall 22 is softened or melted, and the inner peripheral surface of the heat shrinkable tube 24 and the outer peripheral surface of the water blocking wall 22 are bonded. it can.
Further, as the synthetic resin constituting the resin ring 23, a resin that exhibits adhesiveness by being softened or melted by heating may be used. 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 peripheral surface of the heat-shrinkable tube 24 and the outer peripheral surface of the resin ring 23. Furthermore, by forming the resin ring 23 with the synthetic resin material as described above, the inner peripheral surface of the resin ring 23 and the outer peripheral surface of the insulating coating 14 can be bonded.

(Consecutive section 25)
In the water blocking wall 22, a continuous portion 25 that is continuous with the rear end surface of the water blocking wall 22 on the wire barrel 17 side is formed integrally with the water blocking wall 22.
As shown in FIG. 5, the connecting portion 25 covers the outer peripheral surfaces of the bottom plate 19A of the connecting portion 19 and the pair of side plates 19B, 19B of the connecting portion 19 with a substantially uniform synthetic resin layer over the entire circumference. Is formed. That is, the connecting portion 25 includes a bottom plate portion 25A that covers the bottom plate 19A and a pair of side plate portions 25B and 25B that cover both side plates 19B. Thus, the continuous portion 25 has a groove shape opened upward, and the rear end portion of the continuous portion 25 is open rearward. Further, the side plate portions 25B and 25B can be bent and deformed in a direction in which the distal end portions approach or separate from each other with the bottom plate portion 25A as a base end portion. That is, the cross section of the connecting portion 25 orthogonal to the direction in which the core wire 13 extends is formed so that the area occupied by the resin is narrower than the cross section of the water blocking wall 22. Further, as shown in FIG. 2, the connecting portion 25 is formed from the rear end surface of the water blocking wall 22 to a position slightly ahead of the front end edge of the wire barrel 17, and the connecting portion 25, the wire barrel 17, A slight gap is formed between them.

Further, in the region surrounded by the bottom plate portion 25A and the both side plate portions 25B and 25B in the connecting portion 25, the core wire 13 is strongly compressed when the wire barrel 17 is crimped, as shown in FIGS. When 13 extends forward, the leading end of the core wire 13 can be accommodated from the rear end opening of the connecting portion 25. Thereby, even if it is a case where the core wire 13 is extended ahead with crimping | bonding, it can suppress that the core wire 13 presses the rear surface of the connection part 25, and the connection part 25 is damaged.
Further, the rear opening edge of the connecting portion 25 is formed with an inclined surface 25C (corresponding to the guide surface described in the claims) that is inclined straight so that the frontage becomes wider toward the rear. The inclined surface 25C plays a role of guiding the core wire 13 to a normal accommodation position when the core wire 13 enters from the rear into the region surrounded by the bottom plate portion 25A and the side plate portions 25B and 25B.

(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, a punching process (not shown) is performed on a metal plate material, thereby forming a band-shaped carrier 26 and a plurality of terminal metal pieces 27 connected to the side edges of the carrier 26.

  As shown in FIG. 6, a plurality of terminal metal pieces 27 are connected to the carrier 26 side by side at substantially equal intervals along the longitudinal direction. Further, the carrier 26 is formed with feed holes 28 that are 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. In the punching process, a plurality of recesses 18 may be formed on the crimping surface of the wire barrel 17, or the recesses 18 may be formed in a process different from the punching process.

  Next, as shown in FIG. 6, a bending process is performed with respect to the terminal metal piece 27 in which the punching process has been performed. When the terminal metal piece 27 is bent in this bending step, the terminal metal piece 27 is formed longer in the extending direction of the core wire 13 and the connecting portion 19 and the connecting portion 20 are formed.

  Subsequently, as shown in FIG. 7, the feed hole 28 formed in the carrier 26 is engaged with the feed claw, so that the terminal fitting piece 27 is sequentially fed while the water stop is applied to the connecting portion 19 of the terminal fitting piece 27. The wall 22 and the connecting portion 25 are molded. If it demonstrates in detail, the part which should form the water stop wall 22 and the connection part 25 among the connection parts 19 will be clamped from the up-down direction first with a pair of metal mold | die which is not shown in figure. Next, a synthetic resin in a molten state is injected into a molding space formed inside the mold. After the synthetic resin is solidified in the mold, the pair of molds are opened, and the terminal fitting piece 27 in which the water blocking wall 22 and the connecting portion 25 are formed is detached from the mold. The above steps are sequentially performed on the plurality of terminal fitting pieces 27 connected to the carrier 26 at substantially constant intervals.

  In this mold opening process, the connecting portion 25 is formed in a groove shape that opens upward (in a direction orthogonal to the direction in which the core wire extends), so that the mold can be easily opened in the vertical direction. be able to. Thereby, the shape of the molding die for molding the continuous portion 25 can be simplified, and the cost can be reduced.

  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 fitted on the insulating coating 14 at a position behind the position where the insulation barrel 16 is pressure-bonded (a portion located on the opposite side of the wire barrel 17 from the insulation barrel 16 as a center). The resin ring 23 is externally fitted so as to be in close contact with the outer surface of the insulating coating 14 over the entire circumference.

  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 terminal fitting piece 27. Thereafter, the two wire barrel pieces 17B and 17B and the two insulation barrel pieces 16B and 16B are caulked from the outside of the core wire 13 and the insulation coating 14, respectively, by a mold (not shown). Thereby, the wire barrel 17 is crimped to the core wire 13 and the insulation barrel 16 is crimped to the insulating coating 14.

  In this crimping step, when the wire barrel 17 is strongly crimped to the core wire 13, the connecting portion 19 is formed continuously to the wire barrel 17, so that the peripheral portion of the connecting portion 19 on the wire barrel 17 side is The wire barrel piece 17B may be bent and deformed following the deformation of the wire barrel piece 17B. In this regard, according to the present embodiment, since the connecting portion 25 is formed in a groove shape along the outer surface of the connecting portion 19, both side plate portions 25B and 25B in the connecting portion 25 are both wire barrel pieces 17B and 17B. It can be bent and deformed following the deformation. Thereby, it can suppress that the resin layer of the connection part 25 breaks or a resin layer peels from the connection part 19. FIG.

Further, when the core wire 13 extends forward by strongly caulking and crimping the wire barrel 17 to the core wire 13, a region surrounded by the bottom plate portion 25 </ b> A and the both side plate portions 25 </ b> B and 25 </ b> B in the connecting portion 25. In addition, the tip of the core wire 13 can be accommodated. Thereby, it can suppress that a core wire presses the rear surface of a connection part, and a connection part is damaged.
Furthermore, since the opening edge of the rear end opening portion of the connecting portion 25 is formed with an inclined surface 25 </ b> C that becomes wider toward the rear, the front end of the core wire 13 is not caught on the rear end surface of the connecting portion 25. The core wire 13 can be guided to a region surrounded by the bottom plate portion 25A and the side plate portions 25B and 25B. Thereby, it can suppress more reliably that the core wire 13 presses the rear-end surface of the connection part 25. FIG.

  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. As a result, as shown in FIG. 2, each terminal fitting piece 27 is cut from the carrier 26 to be the female terminal fitting 12 connected to the electric wire 11. As shown in FIG. 8, the female terminal fitting 12 connected to the electric wire 11 may be formed by crimping and connecting the electric wire 11 to the female terminal fitting 12 cut from the carrier 26.

  Subsequently, a covering step is performed. More specifically, the heat-shrinkable tube 24 is inserted from the connecting portion 20 side and covered from the water blocking wall 22 over the resin ring 23 to the insulating coating 14. By setting the inner diameter of the heat-shrinkable tube 24 to be larger than the outer diameter of the connection portion 20 in a state before heating, the entire female terminal fitting 12 can be inserted from the connection portion 20 side relatively easily. In addition, when inserting from the electric wire 11 side, the heat shrinkable tube 24 may be inserted into 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). As a result, the inner surface of the heat shrinkable tube 24 is brought into close contact with the outer surface of the water blocking wall 22, the outer surface of the resin ring 23 and the insulating coating 14 without any gap. The electric wire 10 with a terminal metal fitting is completed by the above.
In the above heating step, by heating the connecting portion 20 in an attitude facing upward, even when the water blocking wall 22 is melted in the heating step, the synthetic resin material constituting the water blocking wall 22 is connected to the connecting portion 20. It can suppress flowing in. Thereby, the electrical connection reliability with the male terminal metal fitting of the other party in the connection 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 stop wall 22 is provided in the connection part 19, it can suppress that water permeates from the connection part 19 and water adheres to the core wire 13 and the wire barrel 17. FIG. Furthermore, since the outer peripheral surface of the water blocking wall 22 is in close contact with the inner peripheral surface of the heat shrinkable tube 24 without any gaps, water enters from between the water blocking wall 22 and the heat shrinkable tube 24. It is also suppressed. Thereby, from the part in which the water blocking wall 22 is formed in the connecting part 19 to the part in which the wire barrel 17, the insulation barrel 16, and the resin ring 23 are externally fitted, and beyond the resin ring 23, the insulating coating 14 is applied. Since the region up to this point is stopped by the heat-shrinkable tube 24, it is possible to reliably prevent 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.

When the metal constituting the core wire 13 is different from the metal constituting the female terminal fitting 12, 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.

  Moreover, according to this embodiment, in addition to the water blocking wall 22, the connecting portion 25 extends rearward and is provided integrally with the water blocking wall 22. The length dimension of the interface can be set longer in the front-rear direction than in the case where the continuous portion 25 is not formed. Thereby, even when the connecting portion 19 in the molded portion (the portion where the water blocking wall 22 and the connecting portion 25 are provided) is gradually eroded by water or the like from the connecting portion 20 side, the water is cored 13. The time to reach can be lengthened.

  Further, since the connecting portion 19 is formed continuously to the wire barrel 17 when the wire barrel 17 is strongly caulked and crimped to the core wire 13, the connecting portion 19 is connected to the periphery of the connecting portion 19 on the wire barrel 17 side. The portion may be bent and deformed following the deformation of the wire barrel piece 17B. In this regard, according to the present embodiment, since the connecting portion 25 is formed in a groove shape along the outer surface of the connecting portion 19, both side plate portions 25B and 25B in the connecting portion 25 are both wire barrel pieces 17B and 17B. It can be bent and deformed following the deformation. Thereby, it can suppress that the resin layer of the connection part 25 breaks or a resin layer peels from the connection part 19. FIG.

In addition, when the wire barrel 17 is strongly caulked and crimped to the core wire 13, when the core wire extends forward, in the region surrounded by the bottom plate portion 25 </ b> A and the side plate portions 25 </ b> B and 25 </ b> B in the connecting portion 25. The tip of the core wire 13 can be accommodated. Thereby, it can suppress that the core wire 13 presses the rear surface of the connection part 25, and the connection part 25 is damaged.
Furthermore, since the opening edge of the rear end opening portion of the connecting portion 25 is formed with an inclined surface 25 </ b> C that becomes wider toward the rear, the front end of the core wire 13 is not caught on the rear end surface of the connecting portion 25. The core wire 13 can be guided to a region surrounded by the bottom plate portion 25A and the side plate portions 25B and 25B. Thereby, it can suppress more reliably that the core wire 13 presses the rear-end surface of the connection part 25. FIG.

Further, according to the present embodiment, the water-stop coating is composed of 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 outer surface of the water blocking wall 22 and the outer surface of the end portion of the insulating coating 14 without a gap. Thus, by using the heat-shrinkable tube 24 as the water-stop coating, it is possible to improve the work efficiency of the process of arranging the heat-shrink tube 24 on the outer periphery of the region extending from the water-stop wall 22 to the end of the insulating coating 14. it can.
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 outer surface of the water wall 22 can be securely adhered without a gap, and the heat shrinkable tube 24 and the outer surface of 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 water blocking coating, heat is applied to the outer periphery of the region from the water blocking wall 22 to the end of the insulating coating 14. The working efficiency of the process of covering the shrinkable tube 24 can be improved. In addition, the adhesion between the heat shrinkable tube 24 and the outer surface of the water blocking wall 22 and the outer surface of the end portion of the insulating coating 14 can be improved.

  In general, when a synthetic resin 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 is injected into a molding space and then solidified, and a series of steps of detaching the molded product from the molding die are continuously performed. This is because the injection conditions and the like 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.

In the present embodiment, since the connecting portion 25 is formed in a groove shape opened upward, the mold can be easily opened in the vertical direction. Thereby, the shape of the molding die for molding the continuous portion 25 can be simplified, and the cost of the molding die can be reduced.
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.
The electric wire 30 with terminal metal fittings of the present embodiment is a modification of the peripheral structure of the connecting portion 25 of the first embodiment, and the configuration, operation, and effect common to those of the first embodiment are duplicated. Is omitted. The same reference numerals are used for the same configurations as those in the first embodiment.

As shown in FIG. 9, the connecting portion 31 is formed by covering only the inner surface of the connecting portion 19 (the upper surface of the bottom plate 19A and the opposing surfaces of the side plates 19B and 19B) with a substantially uniform synthetic resin layer. That is, the connecting portion 31 is composed of a bottom plate portion 31A that covers the top surface of the bottom plate 19A, and a pair of side plate portions 31B and 31B that cover the opposing surfaces of both side plates 19B.
Further, the inner surface of the heat shrinkable tube 24 is in close contact with the outer peripheral surface of the connecting portion 19, the front end surfaces of both side plates 19B and 19B of the connecting portion 19, and the front end surfaces of both side plate portions 31B and 31B of the connecting portion 31. ing. Thereby, according to this embodiment, since the quantity of the synthetic resin which comprises the connection part 31 can be reduced, manufacturing cost can be reduced.
Further, since the amount of the synthetic resin in the connecting portion 31 is reduced and the synthetic resin layer does not surround the connecting portion 19 over the entire circumference, the both side plate portions 31B in the connecting portion 31 are both wires. It is easy to bend and deform following the deformation of the barrel pieces 17B and 17B. Thereby, it can suppress that the resin layer of the connection part 31 breaks or a resin layer peels from the connection part 19. FIG.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG.
The electric wire with terminal fitting 40 of the present embodiment is obtained by shifting the water blocking wall 22 of the first embodiment to the wire barrel 17 side, and the configuration, operation, and effect common to the first embodiment are duplicated. The description is omitted. The same reference numerals are used for the same configurations as those in the first embodiment.

  As shown in FIG. 10, the water blocking wall 41 of the present embodiment is provided at the center in the front-rear direction of the connecting portion 25. That is, the portion where the connecting portion 19 is molded has an H shape in plan view. Thus, the position where the water blocking wall 41 is provided can be appropriately set according to the length of the core wire 13 accommodated in the continuous portion 25.

<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 said embodiment, although the terminal metal fitting was the female terminal metal fitting 12, it is not restricted to this, The male terminal provided with the male tab further extended in the direction where the core wire 13 is extended from the connection part 19 It may be a metal fitting, or may be a so-called LA terminal in which a disk-like connection portion is formed continuously with the connecting portion 19 and a through hole is formed in the connection portion.
(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 triangular shape. It may be a polygonal shape and can be any shape as required.

(3) In the above embodiment, the waterproof coating may be configured such that a sheet-shaped waterproof tape is wound around a region from the waterproof wall 22 to the end of the insulating coating 14.
(4) In the above-described 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 connected to the core wire 13 with a wire. The barrel 17 may be formed after being crimped.
(5) In the above 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. Moreover, in the said embodiment, although it was set as the structure which a terminal metal fitting consists of copper or a copper alloy, and a tin plating layer was formed in the surface, it is not restricted to this, As a terminal metal fitting is a structure which consists of arbitrary metals as needed. Also good.

(6) In the above embodiment, the crimping process and the cutting process are performed in the same process, but the present invention is not limited thereto, and the cutting process may be performed after the crimping process is performed. After performing a cutting process, you may perform a crimping | compression-bonding process in the state of an individual piece.
(7) In the above embodiment, the insulation barrel 16 is formed on the female terminal fitting, but the insulation barrel 16 may be omitted.
(8) In the above embodiment, the waterproof coating (heat-shrinkable tube 24, elastic tube) is connected to the wire barrel 17, the insulation barrel 16, the resin ring from the portion of the connecting portion 19 where the waterproof wall 22 is formed. It is good also as a structure which coat | covers the area | region until 23 reaches the part by which external fitting was carried out.

(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 above-described embodiment, the guide surface is configured to be an inclined surface that is straightly inclined so that the width of the rear end opening edge of the connecting portion 25 is wide. You may form in the R surface which is.

10, 30, 40 ... Electric wires with terminal fittings 11 ... Electric wires 12 ... Female terminal fittings (terminal fittings)
DESCRIPTION OF SYMBOLS 13 ... Core wire 14 ... Insulation coating 17 ... Wire barrel 19 ... Connecting part 19A ... Bottom plate 19B ... Side plate 20 ... Connection part 22, 41 ... Water blocking wall 23 ... Resin ring 24 ... Heat shrinkable tube (water blocking coating)
25, 31 ... connecting portion 25C ... inclined surface (guide surface)

Claims (12)

It is an electric wire with a terminal fitting in which the terminal fitting is connected to an electric wire formed by coating the outer periphery of the core wire with an insulation coating,
The terminal fitting is connected to a conductive member; a wire barrel crimped to the core wire exposed from the end of the insulating coating; and a connecting portion connecting the connection portion and the wire barrel; Configured with
A water blocking wall formed by molding a synthetic resin is provided at the joint, and the water blocking wall and the end of the insulating coating are in close contact with the outer surface of the water blocking wall and the outer surface of the end of the insulating coating. A cylindrical water-stop coating covering the core wire is provided between
The water blocking wall is integrally provided with a continuous portion that is continuous with the water blocking wall and extends toward the wire barrel along the outer surface of the connecting portion. The continuous wire extends from the core wire. An electric wire with a terminal fitting that can be flexibly deformed by setting the occupied area of the resin in the cross section orthogonal to the direction to be smaller than the occupied area of the resin in the cross section of the water blocking wall. The connecting portion is provided in a concave shape composed of a bottom plate and a pair of side plates rising from both side edges of the bottom plate to the core wire side,
The electric wire with a terminal fitting according to claim 1, wherein the continuous portion is formed in a groove shape along an outer surface of the bottom plate and an outer surface of the pair of side plates.   The electric wire with a terminal fitting according to claim 1 or 2, wherein the connecting portion is formed to open to the wire barrel side so that the core wire can be accommodated.   The electric wire with a terminal metal fitting according to claim 3, wherein a guide surface having a wide opening toward the wire barrel side is formed at an opening edge on the wire barrel side in the continuous portion.   The electric wire with a terminal fitting according to any one of claims 1 to 4, wherein the water blocking wall is further formed so as to surround the outer periphery of the connecting portion over the entire circumference.   6. The terminal fitting according to claim 1, wherein a resin ring is fitted on an end of the insulating coating, and an inner surface of the water blocking coating is in close contact with the resin ring. Electrical wire.   The electric wire with a terminal metal fitting as described in any one of Claims 1 thru | or 6 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 7, wherein the core wire is made of aluminum or an aluminum alloy.   The electric wire with a terminal fitting according to any one of claims 1 to 8, wherein an adhesive layer or an adhesive layer is formed on an inner peripheral surface of the water blocking coating.   The electric wire with a terminal fitting according to any one of claims 1 to 9, wherein the water-stop coating is a heat-shrinkable tube.   The electric wire with a terminal fitting according to any one of claims 1 to 10, wherein the water blocking coating is 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 is connected to a conductive member; a wire barrel that is crimped to the core wire exposed from the end of the insulating coating; and a connecting portion that connects the connecting portion and the wire barrel; Configured with
A water stop wall formed by molding a synthetic resin on the joint is provided, and the water stop wall and the end of the insulating coating are in close contact with the outer surface of the water stop wall and the outer surface of the end of the insulating cover. A cylindrical water-stop coating that covers the core wire is provided between
The water blocking wall is integrally formed with a continuous portion that is connected to the water blocking wall and extends toward the wire barrel along the outer surface of the connecting portion. The continuous wire extends from the core wire. A terminal fitting that can be flexibly deformed by setting a resin occupation area in a cross section orthogonal to a direction to be smaller than a resin occupation area in a cross section of the water blocking wall.

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