JP2012185984A - Electric wire with terminal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric wire with a terminal fitting which has excellent waterproofness.SOLUTION: An electric wire with a terminal fitting comprises: an electric wire 11 having an insulation coating part 15 in which a core wire 12 is coated with an insulating layer 13, with its tip exposed; a terminal fitting 20 having a wire barrel part 22 crimping the core wire 12, a connection 21 connected to a mating side, and a bottom plate part 24 connecting between the wire barrel part 22 and the connection 21; a cutoff wall 30 arranged to be in close contact with the bottom plate part 24 of the terminal fitting 20; and a cutoff coating 40 which has a tube-like shape and is fitted into the terminal fitting 20 so as to surround the wire barrel part 22, and whose one end 44 watertightly surrounds the tip of the insulation coating part 15 of the electric wire 11, while another end 43 watertightly surrounding an outer periphery of a portion from the cutoff wall 30 to the bottom plate part 24. The inside of the cutoff coating 40 is made of a visible translucent material.

Description

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

  2. Description of the Related Art Conventionally, in an electric wire with a terminal metal fitting in which a terminal metal fitting is connected to an end of the electric wire, a technique for waterproofing by covering a connection portion between the terminal metal fitting and the electric wire with a waterproof coating such as a heat-shrinkable tube is known. For example, the one described in Patent Document 1 includes an electric wire formed by coating the outer periphery of a core wire with an insulating coating, and a terminal fitting that crimps the core wire exposed from the insulating coating. The terminal fitting includes a flat plate-like substrate portion on which the core wire is placed, and a wire barrel portion that protrudes from the substrate portion and crimps the core wire to connect the electric wire. And the heat contraction tube is covered from the board | substrate part of a terminal metal fitting to the terminal part of the insulation coating of an electric wire so that the whole exposed core wire may be covered.

JP 2000-259883 A

  However, in the electric wire with terminal fitting, the outer shape of the wire barrel portion and the substrate portion of the terminal fitting is greatly different. Specifically, the wire barrel portion has a substantially cylindrical shape holding the core wire, whereas the substrate Since the portion has a flat plate shape, there is a possibility that a gap may be formed without sufficient contact between the cylindrical heat-shrinkable tube and the substrate portion. For this reason, there is a concern that the waterproofing is insufficient at the connection portion between the terminal fitting and the electric wire.

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

  The present invention provides an electric wire having an insulating coating portion in which a tip is exposed and a core wire is covered with an insulating layer, a wire barrel portion that crimps the core wire, a connection portion connected to the other side, the wire barrel portion, and the A terminal metal fitting having a bottom plate portion connecting between the connection portion, a water stop wall arranged to be in close contact with the bottom plate portion of the terminal metal fitting, and a tube shape so as to surround the wire barrel portion Fitted to the terminal fitting, one end of which surrounds the tip of the insulating coating of the wire in a watertight manner, and the other end of the wire extends from the water blocking wall to the bottom plate in a watertight manner. A waterproof coating that surrounds the waterproof coating, and the waterproof coating is characterized by being made of a translucent material that allows the inside to be visually recognized.

  According to such a configuration, the water blocking wall body is disposed so as to be in close contact with the bottom plate portion of the terminal fitting, and one end portion of the water blocking coating surrounds the outer periphery of the water blocking wall body from the water blocking wall body in a watertight manner. Therefore, even if the outer shape of the wire barrel portion and the bottom plate portion are different, the difference in shape can be filled with the water blocking wall body, and a gap is prevented from being generated between the water blocking coating and the bottom plate portion. Can do. In addition, since the waterproof coating is made of a translucent material that allows the inside to be visually confirmed, it is possible to check the inside even after the terminal fitting is watertightly enclosed so as to surround the wire barrel portion. it can.

  The waterproof coating has a waterproof layer disposed on the outer peripheral side and an adhesive layer laminated on the inner peripheral side of the waterproof layer, and the waterproof layer and the adhesive layer are both transparent. There may be. According to such a configuration, even in a state where the adhesive layer is adhered to the outer peripheral surface from the water blocking wall body and the bottom plate portion surrounded by the water blocking coating to the insulating coating portion of the electric wire, the inside of the water blocking coating is externally provided. Can be visually recognized. Thereby, since it is possible to confirm even after the pressure-bonded state of the wire barrel part and the presence / absence of the water-stop wall body are surrounded by the water-stop coating, the pressure-bonding failure of the wire barrel part and the presence / absence of the water stop wall body, Alternatively, it is possible to detect a mounting failure of the water blocking wall body. Thus, by setting it as the structure which is easy to detect the malfunction around a water stop coating | cover, quality improvement can be aimed at and the electric wire with a terminal metal fitting more excellent in waterproofness can be provided.

  The water-stop coating has a water-stop layer disposed on the outer peripheral side, and the adhesive layer that is laminated and melted on the inner peripheral side of the water-stop layer, and the water-stop layer is transparent. None, the adhesive layer is colored, and the bottom plate portion or the water blocking wall body has a recessed portion that is recessed with respect to the water blocking coating at a position corresponding to the other end of the water blocking coating. The adhesive layer may flow into the recessed portion in a state where the waterproof coating surrounds the wire barrel portion in a watertight manner.

  According to such a configuration, in a state in which the waterproof coating is watertightly surrounded with respect to the terminal fitting and the electric wire, the adhesive layer flows into the recessed portion formed in the bottom plate portion or the waterproof wall body. It can be easily distinguished whether or not the waterproof coating is adhered at least in the recessed portion. More specifically, when the adhesive layer melts, the adhesive layer flows into the opposing recessed portion, and in the bonded state, the adhesive layer on the recessed portion becomes thicker by the amount of flow. Since the adhesive layer is colored and the water-stopping layer covering the outer periphery is transparent, the adhesive layer on the recessed portion is another adhesive layer from the periphery of the water-stop coating by the depth of the recessed portion. The color is darker than that. On the other hand, when the adhesive layer is not sufficiently melted and the adhesive layer does not flow into the recessed portion, the darkness of coloring that can be visually recognized from the outside by the adhesive layer on the recessed portion and other adhesive layers. There is no difference. By utilizing this difference, it is possible to confirm the melting history of the adhesive layer, and the adhesion state of the waterproof coating to the bottom plate portion or the waterproof wall body in which the recessed portion is formed.

  In addition, the adhesion state of the waterproof coating to the bottom plate portion or the waterproof wall body in which the recessed portion is formed is particularly important in securing waterproofness. That is, even if it is possible to fill the gap between the water blocking coating and the bottom plate portion with the water blocking wall body, the water blocking coating surrounds the bottom plate portion and the water blocking wall body in a watertight manner, that is, If it does not adhere, the waterproofness expected by providing a water blocking wall cannot be secured. Therefore, by making it possible to easily confirm the state of adhesion to the bottom plate part and the water blocking wall body by means of the recessed part and the adhesive layer that flows into the recessed part, it is possible to eliminate defective products and to improve the resistance of the electric wire with terminal fittings. Provision is possible.

  In addition, the color density of the adhesive layer on the recessed portion serves as an index for determining whether or not the entire adhesive layer has melted. That is, in the case where the adhesive layer is automatically melted, if the adhesive layer on the recessed portion is once melted, it can be considered that the adhesive layers in other parts are also melted once. Thereby, it is possible to detect not only poor adhesion of the waterproof coating to the bottom plate portion and the waterproof wall body, but also an overall lack of melting in the adhesive layer of the waterproof coating. Thereby, the further quality improvement of the electric wire with a terminal metal fitting can be aimed at.

  The water blocking wall body may be a resin composition that is thermally welded to the bottom plate portion, and the water blocking coating may be a heat shrinkable tube. According to such a structure, since all can be welded or shrink | contracted and it can be made to closely_contact | adhere with respect to a terminal metal fitting, the manufacturing process can be simplified. In addition, since the inner diameter of the heat-shrinkable tube can be set relatively large before heating, it can be easily disposed on the outer periphery of the terminal fitting in the above range surrounded by the heat-shrinkable tube.

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

The perspective view of the electric wire with a terminal metal fitting concerning Embodiment 1 of the present invention. Cutaway side view of the main part of an electric wire with terminal fittings Perspective view of resin compound used as water blocking wall Cross section Cross section of heat shrink tube A perspective view of a state in which an unheated heat-shrinkable tube is inserted through an electric wire A perspective view of a state in which an unheated heat-shrinkable tube is surrounded by a predetermined fitting position The perspective view of the electric wire with a terminal metal fitting concerning Embodiment 2 Cross-sectional side view Perspective view of resin compound used as water blocking wall Cross section of heat shrink tube A perspective view of a state in which an unheated heat-shrinkable tube is inserted through an electric wire

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the electric wire 10 with terminal fittings of the present embodiment includes an electric wire 11, a terminal fitting 20 that is crimped to the end of the electric wire 11, and a water blocking wall 30 that is welded to the terminal fitting 20. The heat-shrinkable tube 40 (corresponding to a waterproof coating) is enclosed from the outer periphery of the terminal fitting 20 to the electric wire 11. Hereinafter, the left-right direction of FIG. 1 is demonstrated as the front-back direction.

  As shown in FIGS. 1 and 2, the electric wire 11 to be crimped to the terminal fitting 20 is obtained by covering a core wire 12 formed by twisting a plurality of fine metal wires with an insulating layer 13 made of a synthetic resin. Although the core wire 12 is made of aluminum or aluminum alloy, for example, copper, copper alloy, etc. can be appropriately selected. A tip portion of the electric wire 11 is a core wire portion 14 where the insulating layer 13 is removed and the core wire 12 is exposed, and a portion covered with the insulating layer 13 is an insulating coating portion 15.

  As shown in FIG. 1, the terminal fitting 20 has a so-called female shape, and is connected to a mating male terminal (not shown). The terminal fitting 20 is formed by punching a metal plate such as a copper alloy having excellent conductivity into a predetermined shape and bending it, and the surface thereof is plated with tin, nickel or the like. ing. As shown in FIGS. 1 and 2, the terminal fitting 20 has an elongated shape in the front-rear direction as a whole, a connecting portion 21 having a cylindrical shape on the front side, and a core portion 14 of the electric wire 11 on the rear side. The wire barrel part 22 which crimps | bonds and the insulation barrel part 23 which crimps | bonds the insulation coating part 15 of the electric wire 11 are provided in order. The connection portion 21 and the wire barrel portion 22 are connected by a bottom plate portion 24 that is continuous with the bottom portions 21A and 22A.

  The connecting portion 21 has a cylindrical shape with a square cross section, and a mating male terminal can be inserted therein. The wire barrel part 22 is configured by a bottom part 22A having a U-shaped cross section on which the core part 14 of the electric wire 11 is placed, and a pair of crimping pieces 22B rising from both side edges of the bottom part 22A. The crimping piece 22B in the form of a plate is in a state in which the core wire portion 14 is caulked from both sides so as to hold the core wire portion 14 on the bottom portion 22A. The insulation barrel portion 23 extends from the bottom portion 22A of the wire barrel portion 22 in the axial direction opposite to the connection portion 21, and rises from the bottom portion 23A on which the insulating coating portion 15 of the electric wire 11 is placed and from both side edges of the bottom portion 23A. It comprises a pair of crimping pieces 23B. The crimping piece 23B is in the form of a narrower plate than the crimping piece 22B of the wire barrel part 22, and the insulation coating part 15 is caulked from both sides so as to hold the insulation coating part 15 on the bottom 23A. It is in the state.

  The bottom plate portion 24 that is continuous with the bottom portion 21A of the connection portion 21 and the bottom portion 22A of the wire barrel portion 22 has a U-shaped cross section and has an open top. In the bottom plate portion 24, a water blocking wall body 30 is disposed in a state of being in close contact with the inner peripheral surface thereof at a position close to the core wire portion 14.

  As shown in FIG. 3, the water blocking wall 30 is made of a resin compound having a substantially columnar shape, and the outer shape has a shape along at least the inner peripheral surface of the bottom plate portion 24. As shown in FIG. 4, the water blocking wall 30 is composed of a core member 31 having a circular cross section and an adhesive layer 32 covering the outer peripheral surface of the core member 31, and the core member 31 has a melting point of about 170 ° C. The adhesive layer 32 is made of a resin material (adhesive plastic resin) having a melting point of about 120 ° C. The water blocking wall 30 can be obtained by molding the original resin compound into a rod having a circular cross section by two-layer extrusion molding or the like and cutting it into a predetermined length. Although the water blocking wall 30 will be described in detail later, when the heat treatment is performed in a state of being fitted (press-fitted) into the bottom plate portion 24, only the adhesive layer 32 is melted and deformed, and the inner periphery of the bottom plate portion 24 is Weld on the surface. As a result, the water blocking wall body 30 is disposed in close contact with the bottom plate portion 24 without any gap, and functions as a wall that blocks the bottom plate portion 24 connected to the wire barrel portion 22 from the connection portion 21.

  Now, the heat shrinkable tube 40 that watertightly surrounds the outer periphery from the bottom plate portion 24 to which the water blocking wall body 30 is welded to the insulating coating portion 15 of the electric wire 11 is formed in a cylindrical shape, shrinks by heat treatment, and moisture. Made of waterproof resin material that does not pass through. More specifically, as shown in FIG. 5, the heat shrinkable tube 40 has a two-layer structure of a water stop layer 41 on the outer peripheral side and an adhesive layer 42 laminated on the inner peripheral side of the water stop layer 41. . As a material, the water-stopping layer 41 is exemplified by an electron beam cross-linked soft polyolefin resin, and the adhesive layer 42 is exemplified by a hot-melt adhesive. All the colors are transparent colors that allow the inside to be visually recognized, and have translucency. For this reason, in a state where the heat shrinkable tube 40 surrounds the terminal fitting 20 and the electric wire 11 in a watertight manner, the inside thereof, that is, the caulking state of the wire barrel portion 22 and the insulation barrel portion 23, The welding state can be visually confirmed.

  As shown in FIGS. 1 and 2, the heat-shrinkable tube 40 is covered so as to surround from the bottom plate portion 24 to the insulating coating portion 15 of the electric wire 11. More specifically, the front end portion 43 (corresponding to the other end portion) of the heat-shrinkable tube 40 is located closer to the connecting portion 21 than the position where the water blocking wall 30 is welded, and the rear end portion 44 (corresponding to one end portion). Is arranged on the insulating coating portion 15 on the opposite side of the wire barrel portion 22 with respect to the insulation barrel portion 23. The water blocking wall 30 and the wire barrel portion 22 located between the front end portion 41 and the rear end portion 42 are in a state where the entire circumference is covered with the heat shrinkable tube 40, and in particular, the front end of the heat shrinkable tube 40. Since the adhesive layer 42 on the inner periphery of the portion 43 and the rear end portion 44 is in close contact with the corresponding bottom plate portion 24 and the water blocking wall body 30 or the insulating coating portion 15 of the electric wire 11, the core wire portion 14 is waterproofed. It is illustrated.

  Next, the manufacturing method and effect | action of the electric wire 10 with a terminal metal fitting of this embodiment are demonstrated. First, an original plate of the terminal fitting 20 is punched (press-molded) from a metal plate, and subjected to a bending process, a cutting process, and the like. Next, the resin compound constituting the water blocking wall 30 is press-fitted (fitted) into a predetermined position on the bottom plate portion 24 of the terminal fitting 20, and the first heat treatment step is performed. By this first heat treatment step, only the adhesive layer 32 made of a material having a lower melting point than the core material 31 of the water blocking wall 30 is melted and thermally welded to the inner peripheral surface of the bottom plate portion 24 without any gap.

  Subsequently, the electric wire 11 is crimped in a crimping process. Specifically, the core wire portion 14 of the electric wire 11 is placed on the wire barrel portion 22 of the terminal fitting 20 and the insulating coating portion 15 of the electric wire 11 is placed on the insulation barrel portion 23 on the bottom portions 22A and 23A, respectively. Then, the respective crimping pieces 22B and 23B are crimped to the core wire portion 14 and the insulating coating portion 15 by a crimping machine and a crimping jig (not shown).

  After crimping the electric wire 11 to the terminal fitting 20, the heat shrinkable tube 40 is inserted. As shown in FIG. 6, the heat-shrinkable tube 40 may be inserted from the electric wire 11 side or may be inserted from the connecting portion 21 side of the terminal fitting 20. When inserting from the electric wire 11 side, it is desirable to insert it before the crimping process, although it depends on the length of the electric wire 11. As shown in FIG. 6, the heat-shrinkable tube 40 in an unheated state is set to have an inner diameter larger than an outer diameter of a connection portion (the wire barrel portion 22 or the like) between the electric wire 11 and the terminal fitting 20. Therefore, it is easy to insert the heat-shrinkable tube 40 to a predetermined position shown in FIG.

  The heat-shrinkable tube 40 performs the second heat treatment step in a state where the front end portion 43 is positioned so as to be disposed on the connection portion 21 side beyond the water blocking wall body 30. In this second heat treatment step, when heated, the heat shrinkable tube 40 is heat shrunk, the adhesive layer 42 exhibits adhesiveness, and adheres to the outer periphery of the portion surrounding the terminal fitting 20 and the wire 11 without any gap. By doing so, the electric wire 10 with a terminal metal fitting shown in FIG.1 and FIG.2 can be manufactured.

  In addition, in the quality inspection process before shipment, since the heat shrinkable tube 40 is transparent, the inside of the tube can be visually confirmed. By visual inspection, there is a mounting defect such as the presence / absence of the water blocking wall body 30, poor welding, or different orientation. It detects or confirms the crimping state of the wire barrel part 22 and the insulation barrel part 23, and eliminates defective products. Thereby, only the thing with the favorable crimping | compression-bonding state of the electric wire 11 and the favorable welding state of the water blocking wall body 30 can be provided as a finished product.

  In the electric wire 10 with terminal fittings manufactured by the above manufacturing method, the waterproofing of the core wire portion 14 (wire barrel portion 22) is particularly ensured from the water blocking wall 30 to the insulating coating portion 15 of the electric wire 11. Since the inside of the heat-shrinkable tube 40 can be visually confirmed, as described above, the state inside the heat-shrinkable tube 40 can be confirmed even in the state of a finished product in which the heat-shrinkable tube 40 is shrunk and bonded. The water blocking wall 30 is in close water tight contact with the bottom plate portion 24 without any gap, and the water blocking wall 30 blocks liquid such as water that is about to enter from the connection portion 21 through the bottom portion 21A. Acts as a wall. By confirming that the water blocking wall body 30 is welded in the normal position / direction through the transparent heat shrinkable tube 40, it is possible to provide the electric wire 10 with terminal fittings having better waterproofness. .

  As described above, according to the present embodiment, the outer shape of the wire barrel portion 22 and the bottom plate portion 24 differs depending on the water blocking wall 30 that is in close contact with the bottom plate portion 24 and the heat shrinkable tube 40 that surrounds the outer periphery thereof. Even if it is, the difference of the shape can be filled, and it can prevent that a clearance gap produces between the heat contraction tube 40 and the baseplate part 24. FIG. Further, since the heat shrinkable tube 40 is made of a translucent transparent color, after the heat shrinkable tube 40 is watertightly enclosed (after heat shrinkage and bonding) with respect to the electric wire 11 and the terminal fitting 20, Can also visually recognize the inside. Therefore, by confirming the presence / absence of the water blocking wall 30 and the welded state, it is possible to eliminate defective products and improve the waterproofness of the electric wire 10 with terminal fittings to be provided.

  Further, not only the water blocking wall 30 but also the crimping state of the terminal fitting 20 against the electric wire 11, specifically, the caulking state of the wire barrel portion 22 and the insulation barrel portion 23 is confirmed from the outer periphery of the heat shrinkable tube 40. Therefore, it is possible to eliminate defective crimping by visual inspection and to secure the connection reliability between the electric wire 11 and the terminal fitting 20.

  In addition, since both the water blocking wall body 30 and the heat shrinkable tube 40 can be welded or shrunk by heat treatment and can be brought into close contact with a predetermined position of the terminal fitting 20, the manufacturing process can be simplified. it can. Moreover, the heat shrinkable tube 40 can be set to have an inner diameter larger than an outer diameter of a connection portion (wire barrel portion 22 or the like) between the electric wire 11 and the terminal fitting 20 before the heat treatment. Thereby, when inserting the heat-shrinkable tube 40 into the terminal metal fitting 20 and the electric wire 11, the operation | work can be made easy.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.
This embodiment is different from the first embodiment in that recessed portions 53A and 71 are formed in the water blocking wall body 70 and the bottom plate portion 53, and the adhesive layer 82 of the heat shrinkable tube 80 surrounding the outer periphery thereof is colored. Is different. Other configurations are the same as those in the first embodiment, and thus description thereof is omitted.

  As shown in FIGS. 8 and 9, the electric wire 50 with terminal fitting is crimped to the connecting portion 52, the bottom plate portion 53, the wire barrel portion 54, the insulation barrel portion 55, and the wire barrel portion 54 of the terminal fitting 51 from the front side. A core wire portion 61 of the electric wire 60 and an insulation covering portion 62 of the electric wire 60 to be crimped to the insulation barrel portion 55 are provided, and a water blocking wall body 70 is welded and fixed to the bottom plate portion 52. In addition, the heat shrinkable tube 80 surrounds the outer periphery of the water blocking wall body 70 and the insulation coating portion 62 of the electric wire 60 in a watertight manner.

  In the bottom plate portion 53, a recessed portion 53 </ b> A that coincides with a recessed portion 71 of the water blocking wall body 70 described later is formed on the outer peripheral surface of the portion where the water blocking wall body 70 is welded. As shown in FIGS. 9 and 12, the recessed portion 53 </ b> A is a linear groove extending in the circumferential direction, and both end portions are continuous with the recessed portion 71 of the welded water blocking wall body 70. Arranged. As in the first embodiment, the water blocking wall 70 is made of a resin compound having a substantially cylindrical shape, and is composed of a core material and an adhesive layer that covers the outer peripheral surface of the core material, although not shown. As shown in FIG. 10, a groove-like recessed portion 71 extending along the circumferential direction is formed on the peripheral surface of the water blocking wall body 70.

  As in the first embodiment, the heat-shrinkable tube 80 has a two-layer structure of a waterproof water-stopping layer 81 and an adhesive layer 82 having adhesiveness (see FIG. 11). The material used is an electron beam cross-linked soft polyolefin resin as the water-stopping layer 81, and a hot-melt adhesive or the like as the adhesive layer 82. All have translucency, the water blocking layer 81 is transparent, and the adhesive layer 82 is colored with various dyes. Examples of the color include black, brown, red, orange, yellow, green, blue, purple, gray, and white.

  In order to manufacture this electric wire 50 with a terminal metal fitting, the terminal metal fitting 51 is shape | molded similarly to Embodiment 1, the electric wire 60 is crimped | bonded, and the heat-shrinkable tube 80 is penetrated (refer FIG. 12). The heat-shrinkable tube 80 is positioned so as to cover the entire water blocking wall 70 welded to the bottom plate portion 53, and then a second heat treatment step is performed. Then, the entire heat shrinkable tube 80 is thermally shrunk, and the adhesive layer 82 is thermally melted. The melted adhesive layer 82 is closely attached around the electric wire 60 and the terminal fitting 51 that are in contact with each other, and the concave portion of the bottom plate portion 53 is formed. It flows into the provided portion 53A and the recessed portion 71 of the water blocking wall body 70. Thereafter, the adhesive layer 82 is solidified, so that the heat shrinkable tube 80 watertightly surrounds the periphery of the wire barrel portion 54 extending from the water blocking wall body 70 to the insulating coating portion 62 of the electric wire 60, and the terminals shown in FIGS. The electric wire 50 with a metal fitting can be obtained.

  Since the water stop layer 81 is transparent in the electric wire 50 with terminal fittings, the inside of the heat shrinkable tube 80 to which the adhesive layer 82 and the adhesive layer 82 are in close contact can be visually recognized. Here, since the adhesive layer 82 flows into the recessed portions 53 </ b> A and 71, the adhesive layer 82 on the recessed portions 53 </ b> A and 71 is thicker than the other adhesive layers 82. Therefore, as shown in FIG. 8, the adhesive layer 82 on the recessed portions 53 </ b> A, 71 is darker than the other adhesive layers 82 and is visually recognized as a line 83 extending in the circumferential direction. Note that the line 83 does not appear when the adhesive layer 82 is not melted. In addition, when the adhesive layer 82 is not sufficiently in contact with the bottom plate portion 53 in which the recessed portions 53 </ b> A and 71 are formed and the water blocking wall body 70, the line 83 has a fragment shape. Therefore, in the quality inspection process or the like, the contact state of the heat-shrinkable tube 80, that is, the waterproof state of the terminal fitting 51 and the electric wire 60 by the heat-shrinkable tube 80 is confirmed by the presence or absence of the line 83 and the raised state of the line 83 itself. Can do.

  As described above, according to the present embodiment, the adhesive layer 82 is formed on the bottom plate portion 53 or the water blocking wall body 70 in a state where the heat shrinkable tube 80 is watertightly surrounded with respect to the terminal fitting 51 and the electric wire 60. Since it flows into the recessed portions 53A and 71 thus formed, it can be easily distinguished whether or not the heat-shrinkable tube 80 is bonded at least at the recessed portions 53A and 71. More specifically, when the adhesive layer 82 is melted, it flows into the opposing recessed portions 53A and 71, and in the bonded state, the adhesive layer 82 on the recessed portions 53A and 71 becomes thicker by the amount of flow. Since the adhesive layer 82 is colored and the water-stopping layer 81 covering the outer periphery thereof is transparent, from the periphery of the heat-shrinkable tube 80, the concave portions 3A and 71 are formed by the depth of the concave portions 53A and 71. The upper adhesive layer 82 is darker than the other adhesive layers 82 and is visually recognized as a line 83. On the other hand, when the adhesive layer 82 is not melted and the adhesive layer 82 does not flow into the recessed portions 53A and 71, the line 83 does not appear, and the adhesive layer 82 on the recessed portions 53A and 71 and the like. There is no difference in the coloring intensity visible from the outside with the adhesive layer 82. By utilizing this difference, it is possible to confirm the adhesion state of the heat-shrinkable tube 80 to the bottom plate portion 53 or the water blocking wall body 70 where the recessed portions 53A and 71 are formed.

  In addition, the adhesion state of the heat-shrinkable tube 80 to the bottom plate portion 53 or the water blocking wall body 70 in which the recessed portions 53A and 71 are formed is particularly important in securing waterproofness. That is, even if it is possible to fill the gap between the heat shrinkable tube 80 and the bottom plate portion 53 with the water blocking wall body 70, the heat shrinkable tube 80 is attached to the bottom plate portion 53 and the water blocking wall body 70. If it is not watertightly enclosed, that is, in close contact with the watertight wall body 70, the expected waterproofness cannot be secured. Accordingly, the recessed portions 53A and 71 and the adhesive layer 82 flowing into the recessed portions 53A and 71 allow easy confirmation of the adhesion state with respect to the bottom plate portion 53 and the water blocking wall body 70, thereby eliminating defective products and being more waterproof. It is possible to provide the electric wire 50 with terminal fittings.

  Further, the color of the adhesive layer 82 on the recessed portions 53A and 71, that is, the appearance of the line 83, serves as an index for determining whether or not the entire adhesive layer 82 has melted. That is, in the case where the adhesive layer 82 is automatically melted, if the adhesive layer 82 on the recessed portions 53A and 71 is once melted, it is considered that the adhesive layer 82 in other parts is also melted once. Can do. Thereby, not only the poor adhesion of the heat-shrinkable tube 80 to the bottom plate portion 53 and the water blocking wall body 70 but also the entire lack of melting in the adhesive layer 82 of the heat-shrinkable tube 80 can be detected. Therefore, the further quality improvement of the electric wire 50 with a terminal metal fitting can be aimed at.

<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 each of the above-described embodiments, the heat-shrinkable tubes 40 and 80 have a two-layer structure of the water blocking layers 41 and 81 and the adhesive layers 42 and 82. However, the present invention is not limited to this, and the adhesive layer or the adhesive layer It may have a one-layer structure in which is not formed. Moreover, not only the heat-shrinkable tubes 40 and 80 but also a cylindrical member such as a rubber tube may be used.

  (2) In each of the above-described embodiments, the water blocking wall bodies 30 and 70 are heat-welded in the first heat treatment step after being fitted (press-fitted) into the bottom plate portions 24 and 53. For example, the water stop wall may be held on the bottom plate portion by insert molding.

  (3) In each of the above-described embodiments, the water blocking wall bodies 30 and 70 are made of the core material 31 and the adhesive layer 32. However, the present invention is not limited to this. : Perprene (registered trademark), Toyobo Co., Ltd.) may be used. This resin compound is a mixture of two or more resin materials having different melting points. When heat treatment is performed at a temperature exceeding one melting point (not exceeding the other melting point), one resin material melts from the surface. It oozes out and functions as an adhesive for the bottom plate.

  (4) In each of the above-described embodiments, the terminal fittings 20 and 51 are so-called female types. However, the terminal fittings 20 and 51 are not limited thereto, and may be male type or round terminals (so-called LA terminals). ).

  (5) In each above-mentioned embodiment, although the terminal metal fittings 20 and 51 were equipped with the insulation barrel parts 23 and 55, it is not restricted to this, The structure which is not equipped with an insulation barrel part may be sufficient.

  (6) In each of the above-described embodiments, the water blocking wall bodies 30 and 70 are cylindrical, but are not limited to this, and can be appropriately changed according to the shape of the bottom plate portion. For example, the cross section may be oval, oval, or square.

  (7) In each of the above-described embodiments, the first heat treatment step for thermally welding the water blocking wall bodies 30 and 70 to the bottom plate portions 24 and 53 and the second heat shrinking the heat shrinkable tubes 40 and 80 are performed. Although the heat treatment process and the two-stage heat treatment process were provided, the present invention is not limited to this. For example, the water stop wall body may be welded and the heat-shrinkable tube may be contracted by a single heat treatment process. .

DESCRIPTION OF SYMBOLS 10 ... Electric wire 11 with a terminal metal fitting ... Electric wire 12 ... Core wire part 15 ... Insulation coating part 20 ... Terminal metal fitting 21 ... Connection part 22 ... Wire barrel part 23 ... Insulation barrel part 24 ... Bottom plate part 30 ... Water blocking wall body 40 ... Heat Shrinkable tube (waterproof coating)
41 ... Water stop layer 42 ... Adhesive layer 43 ... Front end (other end)
44 ... rear end (one end)

Claims (4)

An electric wire having an insulating covering portion in which the tip is exposed and the core wire is covered with an insulating layer;
A terminal fitting having a wire barrel part for crimping the core wire, a connection part connected to the other side, and a bottom plate part connecting the wire barrel part and the connection part;
A water blocking wall disposed so as to be in close contact with the bottom plate portion of the terminal fitting;
It is fitted to the terminal fitting so as to surround the wire barrel portion in a tube shape, one end portion of which is watertightly surrounding the tip end portion of the insulating coating portion of the electric wire, and the other end portion is the water stop A waterproof coating that watertightly surrounds the outer periphery from the wall body to the bottom plate portion, and
The said water stop coating | cover consists of a translucent material which can visually recognize the inside, The electric wire with a terminal metal fitting characterized by the above-mentioned.   The waterproof coating has a waterproof layer disposed on the outer peripheral side and an adhesive layer laminated on the inner peripheral side of the waterproof layer, and the waterproof layer and the adhesive layer are both transparent. The electric wire with terminal fitting according to claim 1, wherein the electric wire is provided.   The water-stop coating has a water-stop layer disposed on the outer peripheral side, and the adhesive layer that is laminated and melted on the inner peripheral side of the water-stop layer, and the water-stop layer is transparent. None, the adhesive layer is colored, and the bottom plate portion or the water blocking wall body has a recessed portion that is recessed with respect to the water blocking coating at a position corresponding to the other end of the water blocking coating. 2. The electric wire with terminal fitting according to claim 1, wherein the adhesive layer flows into the recessed portion in a state where the waterproof coating surrounds the wire barrel portion in a watertight manner.   The said water stop wall body is a resin composition heat-welded with respect to the said baseplate part, Comprising: The said water stop coating | cover consists of a heat contraction tube, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. Electric wires with terminal fittings described in 1.

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