JP5578105B2 - Electric wire with terminal bracket - Google Patents

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 water blocking coating that surrounds, the terminal fitting or the water blocking wall body is provided with a marker portion at a position corresponding to the other end portion of the water blocking coating, and the water blocking wall body is made of resin. It consists of a compound and covers the core material and the outer peripheral surface of the core material. And a bonding layer, the melting point of the core material has a higher particular characteristic than the melting point of the adhesive layer.

  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 marker portion is provided at a position corresponding to the other end portion of the waterproof coating, by fitting the waterproof coating so that the other end portion of the waterproof coating corresponds to the marker portion, Since the water-stop coating can be provided at an appropriate position with respect to the terminal fitting and the electric wire, the electric wire with the terminal fitting that is more waterproof can be provided.

  That is, when the waterproof coating is fitted at a position near the connection portion of the terminal fitting, there is a fear that the wire barrel portion is insufficiently waterproof because the tightness of the wire to the insulation coating portion is insufficient. On the other hand, when the waterproof coating is fitted at a position near the insulation coating portion of the electric wire, there is not enough contact with the waterproof wall body and the bottom plate portion, and the waterproofing of the wire barrel portion may be insufficient. There is. On the other hand, if a sign part is provided at a position corresponding to the other end of the water stop coating of the terminal fitting or the water stop wall body, just by fitting the water stop cover so as to correspond to the sign part, Adhesion allowances for the insulating coating portion of the electric wire and the water blocking wall body and the bottom plate portion can be ensured appropriately, and the waterproofness of the wire barrel portion by the water blocking coating can be further enhanced.

  In addition, by providing a marker portion at a position corresponding to the other end portion of the water blocking coating, quality inspection can be facilitated, and quality can be further improved. In other words, since it is possible to easily determine whether or not the waterproof coating is fitted at a desired position with respect to the terminal fitting and the electric wire by providing the marker portion, for example, it can be stopped by visual inspection such as image recognition. It can be determined whether or not the water covering is fitted at a desired position. Thereby, it becomes possible to provide the electric wire with a terminal metal fitting which reliably eliminated the fitting failure of the waterproof coating and ensured waterproofness.

  The said marker part may be arrange | positioned in a pair at predetermined intervals in the axial direction of the said terminal metal fitting. According to such a configuration, since it is possible to determine the fitting failure by whether or not the other end portion of the waterproof coating is between the paired marker portions, it is easier and more reliable to produce a defective product. Can be eliminated.

  The mark portion may be a concavo-convex portion that is press-molded simultaneously when the terminal fitting is press-molded. According to such a configuration, since the marker part can be molded simultaneously with the press molding of the terminal fitting, the marker part can be easily molded.

  The water blocking wall body may be a resin compound that is thermally welded to the terminal fitting, 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 Cross-sectional side view AA sectional view of FIG. Perspective view of resin compound used as water blocking wall Cross section Cutaway side view of essential parts with unheated heat-shrinkable tube inserted through the wire Cutaway side view of essential parts in 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 Cutaway side view of the main part in a state in which the heat-shrinkable tube before the heat treatment is surrounded by a predetermined fitting position Cutaway side view of main part of electric wire with terminal fitting according to Embodiment 3 Cutaway side view of the main part in a state in which the heat-shrinkable tube before the heat treatment is surrounded by a predetermined fitting position

<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 ( 2 and FIG. 3), and a heat-shrinkable tube 40 (corresponding to a water stop coating) that surrounds the outer periphery from the terminal fitting 20 to the electric wire 11. Hereinafter, the left-right direction in FIG. 1 will be described as the front-rear direction.

  As shown in FIGS. 2 and 3, 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. 2 and 3, the terminal fitting 20 has an elongated shape in the front-rear direction as a whole, and has a cylindrical connection portion 21 on the front side and a core portion 14 of the electric wire 11 on the rear side. Are provided in the order of a wire barrel portion 22 for crimping and an insulation barrel portion 23 for crimping the insulating coating portion 15 of the electric wire 11. 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, and includes a bottom portion 23A on which the insulating coating portion 15 of the electric wire 11 is placed, and a pair of crimping pieces 23B that rise from both side edges of the bottom portion 23A. Composed. 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. 5, the water blocking wall body 30 is made of a resin compound having a substantially columnar shape, and has an outer shape that is at least along the inner peripheral surface of the bottom plate portion 24. As shown in FIG. 6, the water blocking wall 30 is composed of a core material 31 having a circular cross section and an adhesive layer 32 covering the outer peripheral surface of the core material 31, and the core material 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, on the peripheral surface of the bottom plate portion 24, two (pairing) marker portions 25 are formed. The marking portion 25 is a linear concave portion extending in the circumferential direction, and the formation position thereof is closer to the connection portion 21 than the position where the water blocking wall body 30 is welded, and is predetermined with respect to the axial direction. They are arranged in parallel with each other at intervals. The marking portion 25 is formed at the same time as the terminal fitting 20 is press-molded. The marking portion 25 is concave on the outer peripheral side (corresponding convex on the inner peripheral side) by pressing a metal plate as a material. The portion 25 can be formed.

  The heat-shrinkable tube 40 disposed so as to straddle the label portion 25 has a cylindrical shape and is made of a synthetic resin material that shrinks by heat treatment. An adhesive layer or adhesive layer (not shown) is formed on the inner peripheral surface of the heat-shrinkable tube 40. The adhesive layer or the adhesive layer is shrunk by heat treatment, and the adhesive layer or adhesive layer is softened or melted. Exhibit adhesiveness or tackiness. As shown in FIGS. 1 to 3, 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 41 (corresponding to the other end portion) of the heat-shrinkable tube 40 is disposed between a pair of marker portions 25 formed on the bottom plate portion 24, and the rear end portion 42 (at one end portion). (Corresponding) is disposed on the insulation 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. The peripheral surface adhesive layer or adhesive layer is in close contact with the bottom plate portion 24, the water blocking wall body 30 (see FIG. 4) in close contact therewith, and the insulation coating portion 15 of the electric wire 11, thereby preventing the core portion 14 from being waterproof. It has been.

  Here, when the front end portion 41 of the heat-shrinkable tube 40 is disposed between the paired marker portions 25, the marker portion 25 is connected to the terminal fitting 20 and the electric wire with the heat-shrinkable tube 40 centered on the wire barrel portion 22. Eleven desired regions are formed at positions that can be sufficiently waterproofed. Therefore, if the front end portion 41 of the heat shrinkable tube 40 is disposed between the marking portions 25, the tightness margin for the water blocking wall body 30 and the insulating coating portion 15 can be secured, and the heat shrinkable tube 40 is connected to the terminal fitting. Those that are displaced with respect to the wire 20 and the electric wire 11 and the waterproofing of the wire barrel portion 22 is insufficient can be easily excluded as defective products.

  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). As shown in FIG. 3, the insulation barrel portion 23 is crimped so that the tip ends of the crimping pieces 23B overlap each other.

  After crimping the electric wire 11 to the terminal fitting 20, the heat shrinkable tube 40 is inserted. As shown in FIG. 7, 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. 7, the heat-shrinkable tube 40 in an unheated state has an inner diameter that is set to be larger than an outer diameter of a connection portion (such as the wire barrel portion 22) between the electric wire 11 and the terminal fitting 20. For this reason, it is assumed that 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 process in a state where the front end portion 41 is positioned so as to be positioned between the pair of label portions 25 of the bottom plate portion 24. In this second heat treatment step, the heat-shrinkable tube 40 is heat-shrinked by being heated, and the adhesive layer or adhesive layer on its inner peripheral surface exhibits adhesiveness (adhesiveness). The electric wire 10 with terminal fittings shown in FIG. 1 to FIG. 4 can be manufactured by adhering to the outer periphery of the portion surrounded by 11 without a gap.

  In the quality inspection process regarding waterproofness, whether or not the front end portion 41 of the heat-shrinkable tube 40 is located between the pair of marker portions 25 is determined by visual observation or image recognition. The front end portion 41 surrounds the pair of sign portions 25 (the two sign portions 25 cannot be recognized from the outside), or the front end portion 41 is disposed closer to the water blocking wall 30 than the pair of sign portions 25. Those that have been exposed (both the label portions 25 are exposed) are excluded as defective products. Thereby, only what the heat contraction tube 40 has coat | covered the desired area | region with respect to the terminal metal fitting 20 and the electric wire 11 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. That is, after positioning so that the front end portion 41 of the heat-shrinkable tube 40 is positioned between the pair of label portions 25, if the heat treatment is performed, the water blocking wall body 30 of the heat-shrinkable tube 40 or the insulating coating portion 15 of the electric wire 11 is performed. It is possible to secure a sufficient allowance for the contact. 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. In addition to this, if the contact allowance of the heat shrinkable tube 40 is sufficiently secured, the waterproof property between the water blocking wall 30 and the bottom plate portion 24 closely attached thereto and the front end portion 41 of the heat shrinkable tube 40 is provided. Therefore, the waterproof function by the water blocking wall body 30 and the heat shrinkable tube 40 can be exerted to the maximum with respect to a liquid such as water to enter from the connecting portion 21 side. At the same time, an adhesion allowance of the electric wire 11 to the insulating coating portion 15 is also ensured, so that the waterproof property between the rear end portion 42 of the heat shrinkable tube 40 and the insulating coating portion 15 is also ensured. Intrusion of liquid such as water can be reliably prevented.

  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 bottom plate portion 24 is provided with a pair of marker portions 25, if the front end portion 41 of the heat shrinkable tube 40 is positioned between the marker portions 25, the heat shrinkable tube 40 is connected to the wire barrel. A desired region of the terminal fitting 20 and the electric wire 11 around the portion 22 can be reliably surrounded. In detail, since it becomes possible to ensure the adhesion margin with respect to the water stop wall body 30 and the insulation coating | covering part 15, the electric wire 10 with a terminal metal fitting more excellent in waterproofness can be provided.

  In addition, when positioning the heat-shrinkable tube 40 before the second heat treatment step, the position can be determined with reference to the marking portion 25, so that it is a defective product as compared to the case without the marking portion 25. Can be reduced.

  In addition, by providing the marking portion 25, it can be easily determined whether or not the heat-shrinkable tube 40 covers a desired region with respect to the terminal fitting 20 and the electric wire 11. That is, when the front end portion 41 of the heat-shrinkable tube 40 is disposed between the pair of label portions 25, only one label portion 25 is visually visible. Since this can be easily determined by visual inspection including image recognition, it is possible to reliably eliminate defective fitting of the heat-shrinkable tube 40 and improve quality.

  Moreover, by making the labeling portions 25 to be paired at a predetermined interval, the surrounding position of the heat-shrinkable tube 40 with the marking portion 25 as a guide can be guided to a more accurate position. More specifically, for example, when the marking portion 25 is composed of one, it can be determined whether or not the fitting position of the heat shrinkable tube 40 is appropriate based on whether or not the marking portion 25 can be confirmed from the appearance. However, in this case, if the front end portion 41 of the heat-shrinkable tube 40 is arranged closer to the connecting portion 21 than the marker portion 25, the surrounding position is determined to be appropriate, and therefore the heat-shrinkable tube is biased toward the connecting portion 21. Even when 40 is fitted and the adhesion margin on the insulating coating portion 15 side is insufficient, the surrounding position is determined to be appropriate. On the other hand, if the marker part 25 is composed of a pair as in this embodiment, the heat-shrinkable tube 40 is desired only by determining whether or not the front end part 41 is arranged between the marker parts 25. It is possible to easily and reliably determine that the position is surrounded.

  Moreover, since the label | marker part 25 can be formed simultaneously when press-molding the terminal metal fitting 20, it does not require a new man-hour and is excellent in versatility.

  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.
The present embodiment is different from the first embodiment in that the marker portion 57 is formed on the water blocking wall 56 instead of the bottom plate portion 53. Other configurations are the same as those in the first embodiment, and thus description thereof is omitted.

  As shown in FIGS. 9 and 10, 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 56 is welded and fixed to the bottom plate portion 52. In addition, the heat shrinkable tube 65 surrounds the outer periphery of the water blocking wall body 56 from the insulation covering portion 62 of the electric wire 60 in a watertight manner. The front end portion 66 of the heat-shrinkable tube 65 reaches a marker portion 57 of a water blocking wall 56 to be described later, and the rear end portion 67 is disposed on the insulating coating portion 62.

  Similarly to the first embodiment, the water blocking wall 56 is made of a resin compound having a substantially cylindrical shape, and is constituted by a core material and an adhesive layer that covers the outer peripheral surface of the core material, although not shown. The length of the water blocking wall 55 in the axial direction is longer than that of the first embodiment, and as shown in FIGS. 9 and 10, the front portion is not surrounded by the heat shrinkable tube 65 and is exposed. On the peripheral surface of the water blocking wall 56, a band-shaped marker 57 colored in a different color from the adhesive layer is formed along the circumferential direction. The label portion 57 is preferably made of a resin material (adhesive plastic resin) having a melting point of about 120 ° C., similar to the adhesive layer. This is because the water blocking wall 56 needs to be thermally welded to the bottom plate part 53 in the first heat treatment step.

  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 65 is inserted. As shown in FIG. 12, the heat-shrinkable tube 65 is positioned so that the front end portion 66 is positioned within the range of the marker portion 57 of the water blocking wall 56, and the second heat treatment step is performed. Then, the heat-shrinkable tube 65 is heat-shrinked and closely contacts the outer periphery of the enclosed terminal fitting 51 and the electric wire 60 without a gap. Thereby, the electric wire 50 with a terminal metal fitting shown in FIG.9 and FIG.10 can be obtained.

  In the quality inspection process related to waterproofness, whether the front end portion 66 of the heat-shrinkable tube 65 is approaching the marker portion 57 is determined by visual observation or image recognition, as in the first embodiment. Those that cannot be recognized by the sign part 57 from the appearance or those that can be seen by the whole sign part 57 are excluded as defective products in which the surrounding position of the heat shrinkable tube 65 is not appropriate.

  According to such a configuration, the heat-shrinkable tube 65 can be arranged in a desired region also by providing the marking portion 57 on the water blocking wall body 56. That is, when positioning is performed before the second heat treatment step, the front end portion 66 may be disposed within the range of the marker portion 57. Thereby, since the surrounding position of the heat-shrinkable tube 65 can be determined by the marking portion 57, it is possible to prevent the occurrence of defective products in advance as compared with the case where the marking portion 57 is not provided.

  Further, as long as the front end portion 66 is disposed so as to reach the sign portion 57, the contact allowance for the water blocking wall 56 and the insulating coating portion 62 is sufficiently secured. It is possible to provide the electric wire 50 with terminal fittings that is secured and excellent in waterproofness. In the quality inspection process, it can be easily determined whether or not the heat-shrinkable tube 65 covers a desired region with respect to the terminal fitting 51 and the electric wire 60. Specifically, whether or not a part of the sign part 57 is surrounded by the heat-shrinkable tube 65 (whether or not the area visually recognized is smaller than the area of the sign part 57) is determined by visual inspection including image recognition. What is necessary is just to discriminate. With this easy discrimination method, it is possible to reliably eliminate defective fitting of the heat-shrinkable tube 65 and improve quality.

  Moreover, since the marking part 57 is provided only in the water blocking wall 56, it can be applied without changing the manufacturing process of the terminal fitting 51, for example, the die design of the press die, and therefore, it is excellent in versatility. Furthermore, since it is easier to change the position of the marker part 57 than press-molding the marker part 25 to the terminal fitting 20 as in the first embodiment, for example, the length of the water blocking wall body 30 is changed. Or when changing the arrangement | positioning and changing the full length of the heat-shrinkable tube 65, it can respond flexibly.

<Embodiment 3>
Next, a third embodiment of the present invention will be described with reference to FIGS.
The present embodiment is different from the first embodiment in the shape of the marker portion 72 formed on the bottom plate portion 71. Other configurations are the same as those in the first embodiment, and thus description thereof is omitted.

  On the bottom plate portion 71 of the terminal fitting 70, as shown in FIG. 13, a protruding marker portion 72 that protrudes outward is formed. The indicator portions 72 form a pair and are formed at a predetermined interval in the axial direction. As in the first embodiment, the marking portion 72 can be molded at the same time when the terminal fitting 70 is press-molded.

  As shown in FIG. 14, the heat shrinkable tube 80 is positioned so that the front end portion 81 is positioned between the pair of marker portions 72, and after the second heat treatment process, the heat shrinkable tube 80 is connected to the terminal fitting 70 and the electric wire 75. A desired position can be surrounded in a watertight manner. Further, in the quality inspection process, it is excluded whether or not the front end portion 81 of the heat-shrinkable tube 80 is positioned between the pair of marker portions 72 (whether the marker portion 72 can be recognized at one point by appearance). can do.

  Even with such a configuration, the heat-shrinkable tube 80 can surround desired regions of the terminal fitting 70 and the electric wire 75, so that the waterproof contraction (adhesion allowance) due to heat-shrinkage at a position where the heat-shrinkable tube 80 is displaced. Shortage) can be prevented in advance. Further, even after the heat shrinkage, since it is possible to easily determine whether or not the heat shrink tube 80 is properly arranged in the quality inspection process, the inspection process can be performed by image recognition. Thus, it is possible to easily and surely eliminate the poor fitting of the heat shrinkable tube 80 and improve the quality.

  In addition, since the marker portion 72 has a protruding shape as in the present embodiment, the formation position becomes narrower than the linear concave portion extending in the circumferential direction as in the first embodiment. Excellent. That is, in the present embodiment, it can be seen that the mark portion 72 can be formed anywhere on the bottom plate portion 71. However, for example, when the shape of the bottom plate portion 71 is not flat, other functions are also provided. The formation position of the marker 72 is limited. Even in such a case, the labeling unit 72 of the present embodiment is applicable.

<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 embodiments described above, the water blocking wall bodies 30 and 56 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.

(2) In each of the above-described embodiments, the water blocking wall bodies 30 and 56 are composed of the core material 31 and the adhesive layer 32. As a reference example , for example, a good adhesion elastomer for metal (trade name: 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.

  (3) In each of the above-described embodiments, the terminal fittings 20, 51, and 70 are so-called female types, but are not limited thereto, and may be male types or round terminals (so-called, LA terminal).

  (4) In each of the above-described embodiments, the terminal fittings 20, 51, and 70 are provided with the insulation barrel portions 23 and 55. However, the present invention is not limited to this, and a configuration that does not include the insulation barrel portion may be used.

  (5) In each of the above-described embodiments, the water blocking wall bodies 30 and 56 have a columnar shape, but are not limited thereto, 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.

  (6) In each of the above-described embodiments, the heat-shrinkable tubes 40, 65, and 80 are used as the water-stop coating. However, the present invention is not limited to this, and may be a cylindrical member such as a rubber tube. Moreover, the adhesive layer or the adhesion layer does not need to be formed on the inner peripheral surface of the heat-shrinkable tube.

  (7) In each of the above-described embodiments, the first heat treatment step for thermally welding the water blocking wall bodies 30 and 56 to the bottom plate portions 24, 53, and 71, and the heat shrinkable tubes 40, 65, and 80 are thermally contracted. The second heat treatment step to be performed and the two-step heat treatment step are provided, but the present invention is not limited to this. For example, the heat stop tube is welded and the heat shrinkable tube is contracted by one heat treatment step. There may be.

  (8) In the first embodiment described above, the pair of marker portions 25 are concave on the outer peripheral side. However, the present invention is not limited to this. For example, the marker portions may be convex on the outer peripheral side. Moreover, it does not need to be linear, and it is sufficient that grooves, protrusions, and markings that can be discriminated by visual inspection are provided.

  (9) In Embodiment 1 and Embodiment 3 described above, the marker portions 25 and 72 are made of a pair formed at a predetermined interval in the axial direction. It may consist of a marker part of a book or a single point of protrusion. Moreover, three (point) or more may be sufficient.

  (10) In Embodiment 2 described above, the water stop wall body 56 is provided with the marker part 57 by coloring, but the present invention is not limited to this, and for example, by forming a groove in the water stop wall body, the marker part It may be.

DESCRIPTION OF SYMBOLS 10 ... Electric wire 11 with a terminal metal fitting ... Electric wire 14 ... 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 25 ... Marking part 30 ... Water blocking wall Body 40 ... Heat-shrinkable tube (water-stop coating)
41 ... front end (other end)
42 ... 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 terminal fitting or the water blocking wall body is provided with a marker portion at a position corresponding to the other end portion of the water blocking coating ,
The water blocking wall body is made of a resin compound, and includes a core material and an adhesive layer that covers an outer peripheral surface of the core material, and the melting point of the core material is higher than the melting point of the adhesive layer. With electric wire.   2. The electric wire with terminal fitting according to claim 1, wherein the mark portions are arranged in pairs in the axial direction of the terminal fitting at a predetermined interval.   The electric wire with a terminal metal fitting according to claim 1 or 2, wherein the marker portion is an uneven portion press-molded simultaneously when the terminal metal fitting is press-molded.   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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