JP5510740B2 - Electric wires with terminal fittings and terminal fittings - Google Patents

Description

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

  Conventionally, the thing of patent document 1 is known as an electric wire with a terminal metal fitting. This electric wire with a terminal fitting includes an electric wire formed by coating the outer periphery of a core wire with an insulating coating, and a terminal fitting connected to the core wire exposed from the insulating coating. The terminal fitting includes a flat board portion on which a core wire is placed, and a wire barrel that protrudes from the board portion and is crimped to the core wire. The region from the substrate part to the end of the insulation coating is covered with a heat-shrinkable tube. One end of the heat-shrinkable tube covers the core wire crimped with a wire barrel, and the other end is in close contact with the insulation coating. ing.

JP 2000-259883 A

However, according to the above configuration, since the substrate portion has a flat plate shape, a gap is easily formed between the one end side of the heat-shrinkable tube and the substrate portion, so that water enters the heat-shrinkable tube from this gap, There is concern about this water coming into contact with the core wire and wire barrel. As a result, there is a possibility that problems such as oxidation of the surface of the core wire or the wire barrel may occur.
The present invention has been completed based on the above circumstances, and an object thereof is to prevent water from adhering to a core wire or a wire barrel.

  The present invention is an electric wire with a terminal metal fitting in which a terminal metal fitting is connected to an end of an electric wire whose outer periphery is coated with an insulating coating, the terminal metal fitting being connected to a conductive member, and the insulating coating A wire barrel that is crimped to the end of the core wire exposed from the end of the wire, and a connecting portion that connects the wire barrel and the connecting portion, and a synthetic resin material is molded into the connecting portion. A cylindrical wall covering the core wire in close contact with the outer surface of the water blocking wall and the outer surface of the terminal of the insulating coating and between the water blocking wall and the terminal of the insulating coating. A water blocking coating is provided, and the water blocking wall is applied to the water blocking wall by applying the front end of the core wire before press-bonding at a position spaced rearward from the rear surface that is the surface facing the front end of the core wire. Is integrally provided, and the abutment portion is The leading end of the core wire is allowed to move forward with a displacement or deficiency of the lever portion, and the distance from the rear surface of the water blocking wall of the abutting portion is such that the leading end of the core wire hits the abutting portion. When the core wire extends from a state, the tip of the core wire does not act on the rear surface of the water blocking wall, or is set at a distance that does not reach the rear surface of the water blocking wall. .

  Moreover, this invention is a terminal metal fitting connected to the terminal of the electric wire which coat | covered the outer periphery of the core wire with the insulation coating, Comprising: The connection part connected with an electroconductive member, The terminal of the said core wire exposed from the terminal of the said insulation coating A wire barrel that is pressure-bonded to the wire barrel and a connecting portion that connects the wire barrel and the connecting portion. The connecting portion is provided with a water blocking wall formed by molding a synthetic resin material, and the wire In a state where the barrel is pressure-bonded to the core wire, a cylindrical water-proof coating can be attached so as to cover the core wire between the water-stop wall and the end of the insulating coating. The water wall is integrally provided with a contact portion that contacts the front end of the core wire before crimping at a position spaced rearward from the rear surface that is the surface facing the front end of the core wire in the water blocking wall. , Displacement of the abutment or The leading end of the core wire is allowed to move forward with a loss, and the distance from the rear surface of the water blocking wall of the abutting portion is such that the core wire is in a state where the leading end of the core wire hits the abutting portion. It is characterized in that, when the core wire is extended, the tip of the core wire is set at a distance that does not cause a pressing force to act on the rear surface of the water blocking wall or does not reach the rear surface of the water blocking wall.

  According to the present invention, since the water stop wall is provided by molding the synthetic resin material at the connecting portion that connects the connecting portion and the wire barrel, water can be prevented from entering along the outer surface of the connecting portion. Is done. Moreover, since the opening end of the water blocking coating is in close contact with the outer surface of the water blocking wall, water can be prevented from entering between the water blocking wall and the water blocking coating. Thereby, the area | region from a water stop wall to the terminal of insulation coating is waterproofed by a water stop coating, and it can prevent that water adheres to a core wire and a wire barrel.

  Here, when crimping the end of the core wire of the electric wire to the wire barrel of the terminal fitting, the core wire tends to extend in the axial direction, and depending on conditions such as the material of the core wire, the core wire diameter, and the crimping force, the core wire may extend considerably. Conceivable. Therefore, when setting the end of the core wire to the bottom of the wire barrel to be crimped, if it is set in a state where it protrudes too far and approaches the water blocking wall, There is a possibility that the tip of the wire may damage the water blocking wall, or the tip of the core wire may ride on the outer surface of the water blocking wall. Then, when the waterproof coating is attached, the open end of the waterproof coating cannot be securely adhered to the outer surface of the waterproof wall, and there is a risk of intrusion of water.

On the other hand, in the present invention, a contact portion is integrally provided on the rear surface side of the water blocking wall so as to be spaced apart from the rear surface by a predetermined distance. The abutment portion is configured to allow the tip end of the core wire to move forward with displacement or deficiency of the abutment portion, and the spacing of the abutment portion is such that the tip end of the core wire hits the abutment portion. When the core wire extends from, the distance between the front end of the core wire and the rear surface of the water blocking wall is not applied to the pressing surface, or the rear surface of the water blocking wall is not reached.
Therefore, when setting the end of the core wire to be crimped to the wire barrel, the end of the core wire is set in a state where the tip of the core wire is maximally applied to the contact portion. When the end of the core wire is crimped and stretched, the tip of the core wire approaches the water stop wall with the displacement or breakage of the contact portion, but the separation distance from the water stop wall of the contact portion is set to a predetermined value as described above Therefore, the tip of the core wire does not exert a pressing force on the rear surface of the water blocking wall or does not reach the rear surface of the water blocking wall. Riding on the outer surface of the wall is avoided. As a result, when the waterproof coating is attached, the opening end of the waterproof coating can be securely adhered to the outer surface of the waterproof wall, and the waterproof function by the waterproof coating can be more reliably exhibited. .

Moreover, in the electric wire with a terminal metal fitting and a terminal metal fitting, it is good also as following structures.
(1) The abutting portion is a abutting plate provided at a distal end of a connecting portion projecting from the rear surface of the water blocking wall so as to be able to be elastically compressed. The leading end of the core wire is allowed to move forward with displacement, and the distance from the rear surface of the water blocking wall of the pad plate is such that the tip of the core wire hits the pad plate. When the core wire extends, the tip of the core wire is set to a distance that does not apply a pressing force to the rear surface of the water blocking wall.
When the end of the core wire is set on the wire barrel, the front end of the core wire is stopped by being applied to the contact plate. When the end of the core wire is crimped and stretched, the tip of the core wire retracts the connecting part and approaches the water stop wall while pushing the backing plate, but the tip of the core wire exerts a pressing force against the water stop wall. There is no action.

(2) The abutting portion is a thin film stretched on a projecting end of a peripheral wall projecting from the peripheral edge of the rear surface of the water blocking wall, and the thin film has a tip of the core wire with a defect of the thin film. The core wire is allowed to enter the peripheral wall, and when the core wire extends from a state in which the tip of the core wire hits the thin film, the separation distance of the thin film from the rear surface of the water blocking wall The tip is set to a distance that does not reach the rear surface of the water blocking wall.
When the core wire is set, the front end of the core wire is stopped by being applied to the thin film. When the core wire is crimped and stretched, the tip of the core wire breaks the thin film and approaches the water blocking wall while entering the peripheral wall, but does not reach the water blocking wall.

(3) The abutting portion is a ridge formed along the circumferential direction on the inner surface of the peripheral wall protruding from the peripheral edge of the rear surface of the water blocking wall, and the ridge is accompanied by a defect of the ridge. The leading end of the core wire is allowed to enter the peripheral wall, and the distance from the rear surface of the water blocking wall of the ridge is determined from the state where the tip of the core wire hits the ridge. Is set at such a distance that the tip of the core wire does not reach the rear surface of the water blocking wall.
When the core wire is set, the front end of the core wire is stopped by being applied to the protrusion. When the core wire is crimped and stretched, the tip of the core wire tears the ridge and approaches the water blocking wall while entering the peripheral wall, but does not reach the water blocking wall.

  (4) The said water stop wall is formed so that the outer periphery of the said connection part may be surrounded over the perimeter. Since the water blocking wall can be in close contact with the inner surface of the opening end of the water blocking coating over the entire circumference, the waterproof property can be further improved.

Furthermore, the electric wire with terminal fittings may have the following configuration.
(5) The metal constituting the core wire is different from the metal constituting the terminal 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. According to the said structure, since a core wire and a wire barrel are reliably waterproofed by a water stop coating, it can prevent that a core wire or a wire barrel melt | dissolves by electrolytic corrosion. Therefore, it is particularly effective when the metal constituting the core wire is different from the metal constituting the terminal fitting.

(6) The core wire is made of aluminum or an aluminum alloy.
Since aluminum or aluminum alloy has a relatively small specific gravity, the weight of the electric wire can be reduced. On the other hand, since aluminum or aluminum alloy has a relatively high ionization tendency, it easily dissolves when electrolytic corrosion occurs. According to the said structure, since a core wire and a wire barrel are reliably waterproofed by a water stop coating, it is especially effective when a core wire consists of aluminum or aluminum alloy.
(7) An adhesive layer or an adhesive layer is formed on the inner peripheral surface of the water blocking coating. The inner surface of the water blocking coating and the region extending from the water blocking wall to the terminal of the insulating coating can be closely adhered.

(8) The water stop coating is a heat shrinkable tube.
In the state before heating, since the inner diameter of the heat shrinkable tube is relatively large, it can be easily fitted in the region from the water blocking wall to the end of the insulation coating. Thereafter, the inner surface of the heat-shrinkable tube can be brought into close contact with the water blocking wall and the terminal of the insulating coating by being shrunk by heating. Thus, by using a heat-shrinkable tube as the water-stop coating, it is possible to improve the work efficiency of the process of disposing the water-stop coating on the outer periphery of the region extending from the water-stop wall to the end of the insulation coating.

(9) The waterstop coating is an elastic tube having rubber elasticity.
In the case of an elastic tube, when the elastic tube is fitted to the outer periphery of the region extending from the water blocking wall to the end of the insulation coating in the expanded state, and then the elastic tube is restored and deformed, the inner surface of the elastic tube Adheres closely to the end of the coating. By a simple process, the elastic tube, that is, the water blocking coating, can be applied to the region from the water blocking wall to the end of the insulating coating.

  According to the present invention, it is possible to prevent the breakage of the water blocking wall due to the elongation of the core wire and the climbing of the core wire, and to accurately bring the opening end of the water blocking coating into close contact with the outer surface of the water blocking wall. It can prevent more reliably that water adheres to a wire barrel.

The side view of the electric wire with a terminal metal fitting concerning Embodiment 1 of the present invention Partial cutaway view Expanded end view of line III-III in Fig. 2 Plan view of chain terminal in the state from the bending process to the molding process The VV line expanded end view of FIG. Fig. 4 VI-VI line enlarged end view Plan view of core wire set on wire barrel Plan view after completion of crimping The top view of the female terminal metal fitting before crimping operation concerning Embodiment 2 of the present invention. A plan view of the core wire set on the wire barrel Plan view after completion of crimping The top view of the female terminal metal fitting before crimping operation concerning Embodiment 3 of the present invention. A plan view of the core wire set on the wire barrel Plan view after completion of crimping

<Embodiment 1>
The electric wire A with a terminal metal fitting which concerns on Embodiment 1 of this invention is demonstrated based on FIG. 1 thru | or FIG.
The electric wire A with a terminal fitting is composed of an electric wire 10 and a female terminal fitting 20 (corresponding to the terminal fitting of the present invention) connected to the end of the electric wire 10.

  As shown in FIG. 2, the electric wire 10 includes a core wire 11 formed by twisting a plurality of fine metal wires and an insulating coating 12 made of a synthetic resin that covers the outer periphery of the core wire 11. The core wire 11 is comprised from arbitrary metals as needed, such as copper, a copper alloy, aluminum, and an aluminum alloy. In this embodiment, aluminum or an aluminum alloy is used. In the terminal of the electric wire 10, the terminal of the core wire 11 is exposed by peeling off the insulation coating 12 for a predetermined length. The core wire 11 may be a single core wire.

  The female terminal fitting 20 is formed by pressing a metal plate into a predetermined shape. As a metal which comprises the female terminal metal fitting 20, 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.

As shown in FIGS. 1 and 4, the female terminal fitting 20 is provided with a wire barrel 26 and an insulation barrel 28 via a connecting portion 24 behind a connecting tube portion 21 (corresponding to the connecting portion of the present invention). Structure.
The connecting cylinder portion 21 is connected by inserting a tab of a male terminal fitting (not shown), and has an elastic contact piece 22 inside.
As shown in FIG. 5, the connecting portion 24 is formed in a channel type in which the side plate 24B is raised from both side edges of the bottom plate 24A.

  The wire barrel 26 functions to crimp the exposed end of the core wire 11 in the electric wire 10, and a pair of edges are formed from both side edges of the bottom plate 26 </ b> A extending backward from the bottom plate 24 </ b> A of the connecting portion 24. The barrel piece 26B is raised. The wire barrel 26 is crimped to a so-called heart shape so that the core wire 11 is held from the outside and the protruding edges of both barrel pieces 26B are brought into contact with each other while being bitten into the core wire 11.

  As shown in FIG. 4, a plurality of concave portions 27 having a parallelogram shape are formed on the inner surface of the bottom plate 26A of the wire barrel 26 so as to be aligned vertically and horizontally. Here, in each concave portion 27, the pair of opposing sides are formed in a direction orthogonal to the extending direction of the core wire 11, and thus the fixing force between the core wire 11 and the wire barrel 26 is improved. In addition, since the rims of the plurality of recesses 27 are in sliding contact with the surface of the core wire 11, the contact area between the rims of the recesses 27 and the core wire 11 is increased. As a result, the electrical resistance value between the female terminal fitting 20 and the core wire 11 is increased. Can be lowered.

  The insulation barrel 28 functions to crimp the end of the insulation coating 12 remaining after the peeling of the electric wire 10, and both sides of the bottom plate 28 </ b> A extending from the bottom plate 26 </ b> A of the wire barrel 26 described above. A pair of tall barrel pieces 28B are raised from the edge. The insulation barrel 28 is pressure-bonded to a so-called overlap type in which the end of the insulating coating 12 is held from the outside while overlapping the protruding ends of the barrel pieces 28B.

A water blocking wall 30 is formed in the middle of the connecting portion 24 in the length direction by molding a synthetic resin material. As the synthetic resin material for forming the water blocking wall 30, a thermoplastic resin such as polyamide, polyester, polypropylene and 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.
As shown in FIG. 5, the water blocking wall 30 is formed so as to be able to surround the outer periphery of the connecting portion 24 over the entire periphery, and has a substantially rectangular thick plate shape with rounded corners when viewed from the front.

  Here, on the rear surface side of the water blocking wall 30, when the core wire 11 is placed on the bottom plate 26 </ b> A of the wire barrel 26 so as to crimp the wire barrel 26 to the end of the core wire 11 of the electric wire 10, Is provided so as to stop the core wire 11 in front of the contact plate 32 (corresponding to the contact portion of the present invention). As shown in FIGS. 6 and 7, the contact plate 32 is formed in a substantially square shape in a front view that fits inside the connecting portion 24, and is integrally formed with the water blocking wall 30 via the connecting portion 34. The connecting portion 34 has a mountain shape in plan view and can be deformed flat. The contact plate 32 and the connecting portion 34 are formed in a form rising from the bottom plate 24 </ b> A of the connecting portion 24 from the relationship of die cutting when molding.

The purpose of providing the abutting plate 32 is that when the core wire 11 is crimped to the wire barrel 26 and the elongation in the axial direction occurs, the core wire 11 is provided if the tip of the core wire 11 before the crimping is in front of the caulking plate 32. It is for positioning so that a pressing force may not act on the rear surface of the water blocking wall 30. For example, when the core wire 11 is crimped and stretched in a state where the tip is applied to the contact plate 32, the tip of the core wire 11 deforms the connecting portion 34 into a flat shape and pushes the contact plate 32. The length of the connecting portion 34, that is, the distance away from the rear surface of the water stop wall 30 of the abutting plate 32 is set so that the pressing force from the tip of the core wire 11 does not act on the rear surface of the water stop wall 30.
Therefore, the distance from the rear surface of the water blocking wall 30 of the backing plate 32 is set in consideration of the maximum expected allowance of the core wire 11 according to the material, wire diameter, and crimping force of the core wire 11. It is desirable to do.

In a region from the water blocking wall 30 provided in the connecting portion 24 to the wire barrel 26, the insulation barrel 28, and further to the insulating coating 12, a heat shrinkable tube 40 made of synthetic resin (stopping of the present invention) is provided. Equivalent to water coating). The length dimension of the heat-shrinkable tube 40 is a length dimension that can cover a region extending from the water blocking wall 30 to a position slightly behind the position where the insulation barrel 28 is crimped on the insulating coating 12.
The heat shrinkable tube 40 of the present embodiment has an adhesive layer or an adhesive layer (not shown) formed on the inner surface thereof. The adhesive layer or the pressure-sensitive adhesive layer is heated or softened or melted to express adhesiveness or tackiness.

The inner surface on one end side of the heat-shrinkable tube 40 can be in close contact with the outer surface of the water blocking wall 30 without any gap in a state where the heat-shrinkable tube 40 is heated and contracted. Further, the inner surface on the other end side of the heat shrinkable tube 40 is in close contact with the outer peripheral surface of the insulating coating 12 without any gap.
The heat-shrinkable tube 40 may not be provided with an adhesive layer or an adhesive layer on its inner surface. In this case, as the synthetic resin material constituting the water blocking wall 30, a material that exhibits adhesiveness by being softened or melted by heating may be used. When the water blocking wall 30 is formed of such a synthetic resin material, in the step of heating the heat shrinkable tube 40, the water blocking wall 30 is softened or melted, and the inner surface of the heat shrinkable tube 40 and the outer surface of the water blocking wall 30 are obtained. It can be set as the structure which adhere | attaches.
Even the heat-shrinkable tube 40 in which the adhesive layer or the adhesive layer is not provided on the inner surface can be adhered to the insulating coating 12.

Then, an example of the manufacturing process of the electric wire A with a terminal metal fitting which concerns on this embodiment is shown.
The chain terminal 15 is formed by sequentially passing a metal hoop material through a press machine and performing a punching process, a bending process, and the like. At the final stage of the process, as shown in the upper side of FIG. 4, the assembled female terminal fitting 20 is connected to one side edge of the carrier 16 with a certain pitch. At this time, the female terminal fitting 20 has the connecting cylinder portion 21 assembled in a predetermined cylindrical shape and the connecting portion 24 formed in a predetermined channel shape, while the wire barrel 26 and the insulation barrel 28 are opened before crimping. It is in the state. In each female terminal fitting 20, the rear edge of the bottom plate 28 </ b> A of the insulation barrel 28 is connected to one side edge of the carrier 16 via a connecting portion 17.

Subsequently, the chain terminal 15 is sent to the molding step as indicated by the arrow in the figure. In the molding step, the water blocking wall 30 is molded with respect to the connecting portion 24 of the female terminal fitting 20. A backing plate 32 is integrally formed on the rear surface side of the water blocking wall 30 via a connecting portion 34.
More specifically, in the molding step, a predetermined position in the connecting portion 24 of the female terminal fitting 20 is closed by a pair of upper and lower mold dies, and a synthetic resin in a molten state is formed inside a cavity formed in both molds. The material is injected. When both molds are opened after the synthetic resin material is solidified in the cavity, as shown in the lower side of FIG. 4, the connecting portion 34 and the contact plate 32 are placed at predetermined positions of the connecting portion 24 of the female terminal fitting 20. The water blocking wall 30 containing is formed. Such molding of the water blocking wall 30 is intermittently executed for each of the plurality of female terminal fittings 20.

If the chain terminal 15 by which the water stop wall 30 was molded with respect to each female terminal metal fitting 20 is manufactured, it will be conveyed to the electric wire crimping | compression-bonding site in the state wound, for example.
At the electric wire crimping site, an electric wire 10 that has been subjected to terminal processing, that is, an electric wire 10 in which the insulating coating 12 is peeled off at the end and the end of the core wire 11 is exposed for a predetermined length is prepared.

  An example of the crimping process is as follows. After the female terminal fitting 20 is cut off from the carrier 16, it is set in a crimping die composed of an anvil and a crimper (not shown) and placed on the anvil, for example. After that, the exposed core wire 11 at the end of the electric wire 10 and the remaining end of the insulation coating 12 are placed on the bottom plates 26A and 28A of the wire barrel 26 and the insulation barrel 28, respectively. At this time, as shown in FIG. 7, the electric wire 10 is pushed forward, and the pushing is stopped when the tip of the core wire 11 hits the contact plate 32 of the water blocking wall 30, thereby substantially positioning the portion to be bonded. Is done.

Subsequently, the crimping die is clamped. Specifically, as the crimper approaches toward the anvil, the wire barrel 26 is crimped to the end of the core wire 11 in a heart shape as described above, and the insulation is performed. The connection barrel 28 is crimped to the end of the insulation coating 12 in an overlapping manner. Here, as shown in FIG. 8, the core wire 11 extends along with the crimping of the wire barrel 26, and the leading end pushes the contact plate 32 while deforming the connecting portion 34 into a flat shape. Since the distance from the rear surface of the water blocking wall 30 of the backing plate 32 is set in consideration of the maximum allowance of the core wire 11, even when the core wire 11 extends to the maximum, the pushing from the tip of the core wire 11 is performed. The pressure does not act on the rear surface of the water blocking wall 30, in other words, the tip of the core wire 11 stays in front of the rear surface of the water blocking wall 30 with the deformed connecting portion 34 and the contact plate 32 interposed therebetween. Therefore, the water stop wall 30 is not damaged at the tip of the core wire 11, and the tip of the core wire 11 does not run on the outer surface of the water stop wall 30.
Alternatively, the female terminal fitting 20 may be set in the crimping die while being in the state of the chain terminal 15 and separated from the carrier 16 simultaneously with the crimping process.

When the crimping process in which the female terminal fitting 20 is crimped to the end of the electric wire 10 is completed, the covering process is finally performed.
In the covering process, the heat-shrinkable tube 40 is inserted from the electric wire 10 side or the female terminal fitting 20 side, and covers the region extending from the water blocking wall 30 to the rear position of the insulation coating 12 in the insulation barrel 28. It is done. By setting the inner diameter of the heat-shrinkable tube 40 to be larger than the outer shape of the connection cylinder portion 21 in the state before heating, the heat-shrinkable tube 40 can be inserted from the female terminal fitting 20 side relatively easily. Moreover, what is necessary is just to insert the heat-shrinkable tube 40 in the electric wire 10 beforehand, before performing a crimping | compression-bonding process, when inserting from the electric wire 10 side.

When the heat-shrinkable tube 40 is fitted and then heated by a heating device (not shown), the heat-shrinkable tube 40 is shrunk. As a result, as shown in FIG. It adheres to the outer surface of the insulating coating 12 without a gap. Thus, the manufacture of the electric wire A with terminal fittings is completed.
In addition, in the above heating step, when the connecting cylinder portion 21 is heated in a vertically oriented posture, the synthetic resin material constituting the water blocking wall 30 is connected even when the water blocking wall 30 is melted unexpectedly. Inflow into the tube portion 21 is avoided. As a result, the reliability of electrical connection with the mating male terminal fitting in the connecting tube portion 21 is improved.

According to this embodiment, the following numerous effects can be obtained.
Since the water stop wall 30 is provided in the connecting portion 24 connecting the connecting cylinder portion 21 and the wire barrel 26 by molding of a synthetic resin material, water can be prevented from entering along the outer surface of the connecting portion 24. Is done. Moreover, since the inner surface of the opening end of the heat shrinkable tube 40 is in close contact with the outer surface of the water blocking wall 30, it is possible to prevent water from entering between the water blocking wall 30 and the heat shrinkable tube 40. Thereby, the area | region from the water stop wall 30 to the terminal of the insulation coating 12 is waterproofed by the heat contraction tube 40, and it can prevent that water adheres to the core wire 11 and the wire barrel 26.

In addition, on the rear surface of the water blocking wall 30, a contact plate 32 that contacts the tip of the core wire 11 before crimping is integrally formed via a connecting portion 34 that can be elastically deformed. The tip of the core wire 11 is allowed to move forward along with the elastic deformation of the elastic member 34 and the distance of the backing plate 32 from the rear surface of the water blocking wall 30 is such that the tip of the core wire 11 is applied. When the core wire 11 extends from the state where it hits the plate 32, the tip of the core wire 11 is set to a distance that does not cause the pressing force to act on the rear surface of the water blocking wall 30.
Accordingly, when the end of the core wire 11 is set on the wire barrel 26 to be crimped, the end of the core wire 11 is pressed against the wire barrel 26 and stretched if the front end of the core wire 11 is applied to the abutting plate 32 and stopped. However, the tip of the core wire 11 compresses the connecting portion 34 and presses the contact plate 32 while approaching the water blocking wall 30, but the tip of the core wire 11 exerts a pressing force on the water blocking wall 30. I will not let you. Therefore, the water stop wall 30 is not damaged at the tip of the core wire 11, and the tip of the core wire 11 does not run on the outer surface of the water stop wall 30. As a result, when the heat-shrinkable tube 40 is attached, the open end of the heat-shrinkable tube 40 can be securely adhered to the outer surface of the water blocking wall 30 and the waterproof function by the heat-shrinkable tube 40 can be more reliably exhibited. be able to.

When the metal constituting the core wire 11 is different from the metal constituting the female terminal fitting 20, if water adheres to both the core wire 11 and the wire barrel 26, electrolytic corrosion occurs in the core wire 11 or the wire barrel 26. However, since the core wire 11 and the wire barrel 26 are surely waterproofed by the heat-shrinkable tube 40, the core wire 11 or the wire barrel 26 is prevented from being melted by electrolytic corrosion.
In the case where the core wire 11 is made of aluminum or an aluminum alloy and the female terminal fitting 20 is formed by forming a tin plating layer on the surface of copper or copper alloy as in the present embodiment, aluminum or aluminum alloy having a relatively large ionization tendency is used. This is particularly effective because the core wire 11 may be dissolved by electrolytic corrosion. In addition, since the specific gravity of aluminum or aluminum alloy is relatively small, the electric wire 10 can be reduced in weight.

In the present embodiment, the heat shrinkable tube 40 is used as the water blocking coating. Since the inner diameter of the heat shrinkable tube 40 is relatively large in the state before heating, it can be easily fitted in the region from the water blocking wall 30 to the end of the insulating coating 12. Then, the inner surface of the heat-shrinkable tube 40 can be brought into close contact with the water blocking wall 30 and the terminal of the insulating coating 12 by being contracted by heating. By using the heat-shrinkable tube 40 as the water-stop coating, it is possible to improve the working efficiency of the process of disposing the water-stop coating on the outer periphery of the region from the water blocking wall 30 to the end of the insulating coating 12.
Since the adhesive layer or the pressure-sensitive adhesive layer is formed on the inner peripheral surface of the heat shrinkable tube 40, the inner surface of the heat shrinkable tube 40 and the region from the water blocking wall 30 to the end of the insulating coating 12 are closely adhered. Can do.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the structure of the portion where the abutting portion for abutting the tip of the core wire 11 before crimping is provided on the rear surface side of the water blocking wall 30 molded on the connecting portion 24 of the female terminal fitting 20 is changed. It is.
Hereinafter, the changed part will be mainly described, and the same parts as those in the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

As shown in FIG. 9, a peripheral wall 35 is formed on the rear surface of the water blocking wall 30. For example, the peripheral wall 35 sandwiches both the inner and outer surfaces of the side plate 24B of the connecting portion 24 and is in close contact with only the outer surface side of the bottom plate 24A.
A thin film 36 is formed in an opening on the rear end side in the connecting portion 24 in the peripheral wall 35. More specifically, the left and right side edges of the thin film 36 are connected to the inner surface of the peripheral wall 35, and the lower edge is in contact with the bottom plate 24 </ b> A of the connecting portion 24. This thin film 36 corresponds to the contact portion of the present invention.

  The thin film 36 allows the tip of the core wire 11 to enter the peripheral wall 35 due to its own damage. For example, when the core wire 11 is crimped and stretched while the tip is in contact with the thin film 36, the tip of the core wire 11 is pushed into the peripheral wall 35 while breaking the thin film 36. The protruding length of the peripheral wall 35, that is, the distance away from the rear surface of the water stop wall 30 of the thin film 36 is set so that the tip of the water stays in front of the rear surface of the water stop wall 30.

  Therefore, when the end of the core wire 11 of the electric wire 10 is set on the wire barrel 26 to be crimped, as shown in FIG. When the wire barrel 26 is crimped to the wire barrel 26 and stretched, as shown in FIG. 11, the leading end of the core wire 11 breaks into the peripheral wall 35 while breaking the thin film 36, but the leading end of the core wire 11 is the water blocking wall 30. Never reach the back. Therefore, the water stop wall 30 is not damaged at the tip of the core wire 11, and the tip of the core wire 11 does not run on the outer surface of the water stop wall 30. As in the first embodiment, when the heat shrinkable tube 40 is attached, the opening end of the heat shrinkable tube can be securely adhered to the outer surface of the water blocking wall 30, and the waterproof function by the heat shrinkable tube 40 can be further improved. It can be demonstrated reliably.

<Embodiment 3>
12 to 14 show Embodiment 3 of the present invention. In this third embodiment, another change is added to the structure of the portion where the abutting portion for abutting the tip of the core wire 11 before crimping is provided on the rear surface side of the water blocking wall 30 molded on the connecting portion 24 of the female terminal fitting 20. It is a thing. Similarly, the changed part will be mainly described.

As shown in FIG. 12, a peripheral wall 35 is formed on the rear surface of the water blocking wall 30. For example, the peripheral wall 35 sandwiches both the inner and outer surfaces of the side plate 24B of the connecting portion 24 and is in close contact with only the outer surface side of the bottom plate 24A.
A protrusion 38 having a mountain-shaped cross section is formed along the inner periphery of the opening on the rear end side in the connecting portion 24 in the peripheral wall 35. More specifically, the left and right vertical portions of the ridge 38 are connected to the inner surface of the peripheral wall 35, and the horizontal portion runs on the bottom plate 24 </ b> A of the connecting portion 24. This protrusion 38 corresponds to the contact portion of the present invention.

  The protrusion 38 allows the tip of the core wire 11 to enter the peripheral wall 35 by being torn. For example, when the core wire 11 is crimped and stretched while the tip is in contact with the ridge 38, the tip of the core wire 11 is pushed into the peripheral wall 35 while tearing the ridge 38. The protruding length of the peripheral wall 35, that is, the distance away from the rear surface of the water stop wall 30 of the ridge 38 is set so that the tip of the core wire 11 stays in front of the rear surface of the water stop wall 30.

  Therefore, when the end of the core wire 11 of the electric wire 10 is set in the wire barrel 26 to be crimped, as shown in FIG. When the terminal is crimped to the wire barrel 26 and stretched, as shown in FIG. 14, the tip of the core wire 11 enters the peripheral wall 35 while tearing the protrusion 38, but the tip of the core wire 11 is the water blocking wall. Never reach the back of 30. Therefore, the water stop wall 30 is not damaged at the tip of the core wire 11, and the tip of the core wire 11 does not run on the outer surface of the water stop wall 30. As in the first and second embodiments, when the heat-shrinkable tube 40 is attached, the open end of the heat-shrinkable tube 40 can be securely adhered to the outer surface of the water blocking wall 30, and the water-shrinkable tube 40 is waterproof. The function can be exhibited more reliably.

<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 form of the contact part which contacts the front-end | tip of the core wire 11 before the crimping | compression-bonding arrange | positioned on the rear surface side of the water blocking wall 30 is not restricted to what was illustrated to the said embodiment, The point is the displacement or defect | deletion of the said contact part. When the leading end of the core wire 11 is allowed to move forward, and the distance from the rear surface of the water blocking wall 30 of the abutting portion extends from the state where the leading end of the core wire 11 hits the abutting portion. In addition, as long as the tip of the core wire 11 does not cause a pressing force to act on the rear surface of the water blocking wall 30 or is set at a distance that does not reach the rear surface of the water blocking wall 30, other forms may be used. .

  (2) Moreover, when the core wire 11 is extended from the state where the tip of the core wire 11 hits the contact portion, the distance of the contact portion from the rear surface of the water stop wall 30 is strictly the water stop wall. Even if the pressing force does not act on the rear surface of the water 30 or the distance does not reach the rear surface of the water blocking wall 30, as long as the water blocking wall 30 is not damaged or the tip of the core wire 11 rides on the outer surface of the water blocking wall 30. May be a distance such that the tip of the core wire 11 applies a slight pressing force to the rear surface of the water blocking wall 30 or lightly hits the rear surface of the water blocking wall 30.

  (3) About the water stop wall 30 molded in the connection part 24 of the female terminal metal fitting 20, it is necessary to form so that the outer side of the connection part 24 may be surrounded over the perimeter as illustrated in the said embodiment. Alternatively, it may be provided so as to fill at least the groove of the connecting portion 24. In this case, there is a possibility that the inner surface of the heat-shrinkable tube 40 and the exposed outer surface of the connecting portion 24 may not be completely adhered, but even if water enters from the outer surface side of the connecting portion 24, the core wire 11 and the wire Since the contact portion with the barrel 26 is not easily reached, the occurrence of electrolytic corrosion can be avoided. In this configuration, since the amount of the synthetic resin material that is the material of the water blocking wall 30 can be reduced, it is possible to contribute to the reduction of the manufacturing cost.

  (4) As the water-stop coating, an elastic tube having rubber elasticity may be used instead of the heat shrinkable tube 40 exemplified in the above embodiment. In the case of an elastic tube, when the elastic tube is fitted to the outer periphery of the region extending from the water blocking wall 30 to the end of the insulating coating 12 in the expanded state, and then the elastic tube is restored and deformed, the inner surface of the elastic tube becomes the water blocking wall. 30 and the end of the insulating coating 12 are in close contact. By a simple process, the elastic tube, that is, the water blocking coating, can be applied to the region extending from the water blocking wall 30 to the end of the insulating coating 12.

  (5) In the said embodiment, although the core wire 11 was set as the structure which consists of aluminum or aluminum alloy, it is not restricted to this, The core wire 11 is good also as a structure which consists of copper or a copper alloy, and forms with arbitrary metals as needed. It is good also as a structure to be made. In addition, the female terminal fitting 20 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 female terminal fitting may be made of any metal as required.

  (6) In the said embodiment, although the female terminal metal fitting 20 was illustrated as a terminal metal fitting, in addition to that, the male terminal metal fitting which provided the male tab in the connection part, the LA terminal which a connection part makes eyeball shape, Furthermore, connection Splice terminals, etc., where the part is a wire barrel that crimps the core wire of another electric wire, in short, the terminal fitting is connected to the conductive member and the end of the core wire exposed from the end of the insulation coating The present invention can be applied to all of the devices configured to include a wire barrel to be crimped and a connecting portion that connects the wire barrel and the connecting portion.

A ... Electric wire with terminal fitting 10 ... Electric wire 11 ... Core wire 12 ... Insulation coating 20 ... Female terminal fitting (terminal fitting)
21 ... Connection cylinder part (connection part)
24 ... Connecting part 26 ... Wire barrel 30 ... Water blocking wall 32 ... Batter plate (batter part)
34 ... Connection part 35 ... Peripheral wall 36 ... Thin film (abutting part)
38 ... Projections (striking part)

Claims (15)

An electric wire with a terminal fitting, in which the terminal fitting is connected to the end of the electric wire whose outer periphery is coated with an insulation coating,
The terminal fitting is connected to a conductive member, a wire barrel that is crimped to the end of the core wire exposed from the end of the insulation coating, and a connecting portion that connects the wire barrel and the connection. Configured with
The joint portion is provided with a water blocking wall formed by molding a synthetic resin material. The water blocking wall and the terminal of the insulating coating are in close contact with the outer surface of the water blocking wall and the outer surface of the terminal 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 contact portion that contacts the front end of the core wire before pressure bonding at a position spaced rearward from the rear surface that is a surface facing the front end of the core wire in the water blocking wall,
This abutting part allows the tip of the core wire to move forward with displacement or deficiency of the abutting part,
And when the said core wire is extended from the state where the separation | spacing distance from the rear surface of the said water stop wall of the said contact part contacted the said contact part with the front-end | tip of the said core wire, the front-end | tip of the said core wire is the rear surface of the said water stop wall An electric wire with terminal fittings is set to a distance that does not cause a pressing force to be applied to the outer wall or does not reach the rear surface of the water blocking wall. The abutting portion is a abutting plate provided at the tip of a connecting portion protruding on the rear surface of the water blocking wall so as to be elastically deformable, and the abutting plate is displaced forward by elastically contracting the connecting portion. The leading end of the core wire is allowed to move forward, and the distance from the rear surface of the water blocking wall of the pad plate is such that the core wire is in a state where the tip of the core wire hits the pad plate. The electric wire with terminal metal fittings according to claim 1, wherein, when stretched, the end of the core wire is set to a distance that does not cause a pressing force to act on the rear surface of the water blocking wall. The abutting portion is a thin film stretched on a protruding end of a peripheral wall projecting from the peripheral edge of the rear surface of the water blocking wall, and the thin film has a tip of the core wire in the peripheral wall with a defect of the thin film. And the distance between the thin film from the rear surface of the water blocking wall is such that when the core wire extends from a state where the tip of the core wire hits the thin film, the tip of the core wire is The electric wire with a terminal fitting according to claim 1, wherein the electric wire is set at a distance that does not reach the rear surface of the water blocking wall. The abutting portion is a ridge formed along the circumferential direction on the inner surface of the peripheral wall projecting from the peripheral edge of the rear surface of the water blocking wall, and the ridge includes the core wire with a defect of the ridge. The tip of the core wire is allowed to enter the peripheral wall, and the distance from the rear surface of the water blocking wall of the ridge extends from the state where the tip of the core wire hits the ridge. 2. The electric wire with terminal fitting according to claim 1, wherein a distance at which a tip of the core wire does not reach a rear surface of the water blocking wall is set. The electric wire with terminal fitting according to any one of claims 1 to 4, wherein the water blocking wall is formed so as to surround the outer periphery of the connecting portion over the entire circumference. The electric wire with a terminal metal fitting according to any one of claims 1 to 5, wherein a metal constituting the core wire is different from a metal constituting the terminal metal fitting. The said core wire consists of aluminum or aluminum alloy, The electric wire with a terminal metal fitting as described in any one of Claim 1 thru | or 6 characterized by the above-mentioned. The electric wire with a terminal fitting according to any one of claims 1 to 7, wherein an adhesive layer or an adhesive layer is formed on an inner peripheral surface of the water blocking coating. The electric wire with terminal fitting according to any one of claims 1 to 8, wherein the water-stop coating is a heat shrinkable tube. The electric wire with terminal fitting according to any one of claims 1 to 8, wherein the water blocking coating is an elastic tube having rubber elasticity. A terminal fitting connected to the end of an electric wire whose outer periphery is coated with an insulation coating,
A connection portion connected to the conductive member; a wire barrel that is crimped to the end of the core wire exposed from the end of the insulating coating; and a connecting portion that connects the wire barrel and the connection portion.
A water stop wall formed by molding a synthetic resin material is provided at the joint portion, and the wire barrel is crimped to the core wire and spans between the water stop wall and the end of the insulating coating. A cylindrical waterproof coating can be attached to cover the core wire,
The water blocking wall is integrally provided with a contact portion that contacts the front end of the core wire before pressure bonding at a position spaced rearward from the rear surface that is a surface facing the front end of the core wire in the water blocking wall,
This abutting part allows the tip of the core wire to move forward with displacement or deficiency of the abutting part,
And when the said core wire is extended from the state where the separation | spacing distance from the rear surface of the said water stop wall of the said contact part contacted the said contact part with the front-end | tip of the said core wire, the front-end | tip of the said core wire is the rear surface of the said water stop wall The terminal fitting is characterized in that it is set to a distance that does not cause a pressing force to be applied to the surface or does not reach the rear surface of the water blocking wall. The abutting portion is a abutting plate provided at the tip of a connecting portion protruding on the rear surface of the water blocking wall so as to be elastically deformable, and the abutting plate is displaced forward by elastically contracting the connecting portion. The leading end of the core wire is allowed to move forward, and the distance from the rear surface of the water blocking wall of the pad plate is such that the core wire is in a state where the tip of the core wire hits the pad plate. The terminal fitting according to claim 11, wherein when stretched, the distal end of the core wire is set to a distance that does not cause a pressing force to act on the rear surface of the water blocking wall. The abutting portion is a thin film stretched on a protruding end of a peripheral wall projecting from the peripheral edge of the rear surface of the water blocking wall, and the thin film has a tip of the core wire in the peripheral wall with a defect of the thin film. And the distance between the thin film from the rear surface of the water blocking wall is such that when the core wire extends from a state where the tip of the core wire hits the thin film, the tip of the core wire is The terminal fitting according to claim 11, wherein the terminal fitting is set to a distance that does not reach the rear surface of the water blocking wall. The abutting portion is a ridge formed along the circumferential direction on the inner surface of the peripheral wall projecting from the peripheral edge of the rear surface of the water blocking wall, and the ridge includes the core wire with a defect of the ridge. The tip of the core wire is allowed to enter the peripheral wall, and the distance from the rear surface of the water blocking wall of the ridge extends from the state where the tip of the core wire hits the ridge. The terminal fitting according to claim 11, wherein a distance at which a tip of the core wire does not reach a rear surface of the water blocking wall is set. The terminal fitting according to any one of claims 11 to 14, wherein the water blocking wall is formed so as to surround the outer periphery of the connecting portion over the entire periphery.

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