JP2014203725A - Electric wire with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent formation of a gap in a coated crimping part of a crimp terminal in a simple manner, in an electric wire with a terminal to which a water stop part of a synthetic resin is formed.SOLUTION: In an electric wire 1 with a terminal, a heat-shrinkable tube 8 is tightly contacted with an outside surface of a coated crimping part 20 of a crimp terminal 10 and an outer peripheral surface of an insulation coating 920, in a region striding over a second edge part 202 on an opposite side to a first edge part 201 on a core wire crimping part 40 side, in the coated crimping part 20. A water stop resin part 7 is formed by solidifying a liquid synthetic resin. The water stop resin part 7 covers a naked core wire part 91 to fill gap between a pair of front end edge parts 211 of the coated crimping part 20. Further, the water stop resin part 7 covers gap between the front end edge parts 211 and an end part of the heat-shrinkable tube 8 from an outer peripheral surface side of the heat-shrinkable tube 8.

Description

  The present invention relates to an electric wire with a terminal including an insulated wire, a crimp terminal attached to an end portion of the insulated wire, and a water-stopping resin portion that covers a core wire extending from an insulating coating in the insulated wire.

  In a wire harness mounted on a vehicle, a metal crimp terminal inserted into a connector cavity is attached to an end of an electric wire. As shown in Patent Document 1, the crimp terminal has a coated crimp part, a core wire crimp part, and a contact part.

  A covering crimping part is a part crimped | bonded to the insulation coating in the edge part of an electric wire. A core wire crimping part is a part crimped | bonded to the core wire extended from the insulation coating in the edge part of an electric wire. The contact portion is a portion that is in direct contact with the counterpart terminal and connected to the counterpart terminal. Hereinafter, an electric wire having a crimp terminal attached to the end portion is referred to as a terminal-attached electric wire.

  Note that the coated crimping part, the core crimping part, and the contact part are referred to as an insulation barrel, a wire barrel, and a contact, respectively.

  When the core wire of the insulated wire is an aluminum wire, the dissimilar metal contact corrosion between the core wire of the insulated wire and the crimp terminal tends to occur. In order to prevent different metal contact corrosion, it is effective to cover the exposed portion of the core wire of the insulated wire from the crimp terminal with a synthetic resin coating.

  For example, the terminal-attached electric wire shown in Patent Document 1 has a synthetic resin water stop portion that covers the core wire extending from the insulation coating of the insulated wire from the outside of the core wire crimping portion. The water stop portion of the synthetic resin is provided to prevent liquid from entering the portion where the core wire of the insulated wire and the core wire crimp portion of the crimp terminal contact. The water stop portion of the synthetic resin is made of a member obtained by solidifying the fluid synthetic resin. Hereinafter, the water stop portion of such a synthetic resin is referred to as a water stop resin portion.

  Moreover, in the crimp terminal shown in Patent Document 2, an introduction groove for an anticorrosive material (fluid synthetic resin) is formed on the inner surface of the coated crimp part. Thereby, it becomes possible to reliably fill the anticorrosive material between the insulated wire and the coated crimping portion.

JP 2010-108798 A JP 2011-192530 A

  In the electric wire with terminal shown in Patent Document 1, a gap may be formed between the outer peripheral surface of the insulating coating in the insulated wire and the inner side surface of the coated crimping portion in the crimp terminal.

  The gap on the inner side of the coated crimping portion becomes a liquid intrusion path to the end of the core wire. Therefore, although the water-stopping resin portion is formed, the portion where the core wire and the crimp terminal are in contact with each other is corroded.

  On the other hand, if the crimp terminal shown in Patent Document 2 is employed, it is possible to prevent a gap from occurring inside the coated crimp portion. However, it is desirable to prevent a gap from being formed inside the coated crimping portion more simply than processing to form a groove in the crimping terminal.

  An object of the present invention is to easily prevent a gap from being formed inside a crimping terminal of a crimp terminal in a terminal-attached electric wire in which a water-stop part of a synthetic resin is formed. It is to prevent corrosion of the part where the contact is made.

  The electric wire with a terminal concerning the 1st mode is provided with an insulated electric wire, a crimp terminal, a heat contraction tube, and a water stop resin part. The crimp terminal includes a core wire crimping portion and a sheath crimping portion that are crimped to the insulating coating portion of the insulated wire and the core wire extending from the insulating coating. The heat-shrinkable tube is contracted by receiving heat, and the outer surface of the coated crimping portion in a region straddling the second edge on the opposite side to the first edge on the core crimping portion side in the coated crimped portion. And close to the outer peripheral surface of the insulating coating. The water-stopping resin portion is made of a member obtained by solidifying a fluid synthetic resin. The water-stopping resin portion covers a portion exposed from the crimp terminal on a distal end side from a portion in contact with the first edge portion of the coated crimp portion in the insulated wire. Furthermore, the water-stopping resin portion closes the space between the pair of tip edge portions crimped to the insulated wire in the coated crimping portion from the first edge portion to a position in contact with the heat shrinkable tube. Furthermore, the water-stopping resin portion closes the space between the tip edge portion of the covering crimping portion and the end portion of the heat-shrinkable tube from the outer peripheral surface side of the heat-shrinkable tube.

  The electric wire with a terminal concerning the 2nd mode is one mode of the electric wire with a terminal concerning the 1st mode. In the terminal-attached electric wire according to the second aspect, a layer of a thermoplastic adhesive that adheres the heat-shrinkable tube, the outer surface of the coated crimping portion, and the outer peripheral surface of the insulating coating to the inner surface of the heat-shrinkable tube. Is formed.

  The electric wire with a terminal concerning the 3rd mode is one mode of the electric wire with a terminal concerning the 1st mode or the 2nd mode. The electric wire with a terminal concerning the 3rd mode WHEREIN: The said core wire of the said insulated wire consists of a metal material which has aluminum as a main component. Further, the crimp terminal is made of a metal material mainly composed of copper.

  In each aspect shown above, the water-stopping resin portion covers a portion of the insulated wire that is exposed from the crimp terminal on the core crimp portion side of the crimp terminal. Therefore, the water stop resin portion prevents the liquid from entering the end portion of the core wire from the outside of the crimp terminal.

  On the other hand, the heat-shrinkable tube seals between the outer peripheral surface of the insulating coating in the insulated wire and the coated crimping portion in the crimp terminal in the entire circumferential direction of the insulated wire. Due to the action of the heat-shrinkable tube, it is possible to prevent a gap that leads to the end of the core wire from being formed between the insulating coating and the coated crimping portion of the crimp terminal.

  Moreover, the water stop resin part fills between a pair of front-end edge parts of the coating | compression-bonding crimped part crimped to the insulated wire. Furthermore, the water-stopping resin portion closes the space between the tip edge portion of the coated crimping portion and the end portion of the heat shrinkable tube. For this reason, it is also possible to prevent the liquid from entering the end portion of the core wire from between the pair of front end edge portions of the covering crimping portion.

  By the way, the outer surface of the covering crimping part crimped to the end of the insulated wire is a smooth curved surface. Therefore, when the heat-shrinkable tube is heated in a state of being in direct contact with the outer surface of the coated crimping portion, the heat-shrinkable tube is likely to be in close contact with the outer surface of the coated crimped portion without any gap.

  Moreover, when the water-stopping resin part is formed by the flow of a fluid synthetic resin, the surface of the water-stopping resin part is unlikely to have a smooth shape. Therefore, when the heat shrinkable tube covers the coated crimping portion from the outside of the water-stopping resin portion formed on the surface, a gap is likely to be generated between the heat-shrinkable tube and the waterstop resin portion.

  In each of the above aspects, the water-stopping resin portion closes the space between the pair of tip edge portions of the coated crimping portion and the end portion of the heat-shrinkable tube from the outer peripheral surface side of the heat-shrinkable tube. That is, after the heat-shrinkable tube is heated to shrink so as to be in close contact with the outer surface of the coated crimping portion, the water-stopping resin portion is formed. Therefore, the heat-shrinkable tube is in close contact with the outer surface of the coated crimping portion without any gap, and the water-stop effect of the heat-shrinkable tube is enhanced.

  Moreover, attaching a heat-shrinkable tube to a terminal-attached electric wire is easier than applying a process for forming a groove in a crimp terminal. That is, the heat shrinkable tube can be attached by a very simple process of heating the heat shrinkable tube after passing the insulated wire through the hollow portion of the heat shrinkable tube.

  As described above, according to each aspect described above, it is possible to easily prevent a gap from being formed inside the coated crimp portion of the crimp terminal. As a result, even when the core wire of the insulated wire and the crimp terminal are made of different metals, it is possible to prevent different metal contact corrosion.

  In addition, even when the core wire of an insulated wire and a crimp terminal are comprised with the same kind of metal, said each aspect is effective in prevention of the corrosion of the part which the core wire of an insulated wire and a crimp terminal contacts.

  In the second aspect, the thermoplastic adhesive bonds the inner surface of the heat-shrinkable tube to the outer surface of the coated crimping portion and the outer peripheral surface of the insulating coating. In this case, the sealing property of the end portion of the insulated wire by the heat-shrinkable tube is further enhanced, which is preferable. Furthermore, the position shift of the heat shrinkable tube with respect to the insulated wire is prevented.

  Moreover, in the 3rd aspect, the core wire of an insulated wire and a crimp terminal are comprised with the metal material of a different type. This configuration is a configuration in which dissimilar metal contact corrosion is particularly likely to occur when the liquid enters the core wire portion of the insulated wire. Therefore, the effect of the present invention that can prevent the liquid from entering the core portion of the insulated wire becomes more remarkable.

It is a perspective view of electric wire 1 with a terminal concerning an embodiment of the present invention. It is a side view of the principal part of the electric wire 1 with a terminal. It is a top view of the principal part of the electric wire 1 with a terminal. It is a longitudinal cross-sectional view of the principal part of the electric wire 1 with a terminal. It is a cross-sectional view of the principal part of the electric wire 1 with a terminal. It is a perspective view which shows a mode that a heat contraction tube is positioned by the edge part of an electric wire with a terminal. It is a perspective view which shows a mode that a heat-shrinkable tube is heated. It is a perspective view which shows a mode that fluid synthetic resin is supplied to the edge part of an electric wire with a terminal.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiment is an example embodying the present invention, and is not an example of limiting the technical scope of the present invention. The electric wire with a terminal concerning each embodiment shown below is a part of wire harness carried in vehicles, such as a car.

  As shown in FIGS. 1 to 4, the terminal-attached electric wire 1 includes an insulated electric wire 9, a crimp terminal 10, a water stop resin portion 7, and a heat shrinkable tube 8. 2 to 5 are a side view, a plan view, a longitudinal sectional view, and a transverse sectional view, respectively, of a portion of the crimping terminal 10 of the crimping terminal 10 in the terminal-attached electric wire 1. 4 is a cross-sectional view taken along the II-II plane shown in FIG. FIG. 5 is a cross-sectional view in the III-III plane shown in FIG.

<Insulated wire>
The insulated wire 9 to which the crimp terminal 10 is attached is a wire having a core wire 910 that is a long conductor and an insulating coating 920 that is an insulator covering the periphery of the core wire 910. In general, the core wire 910 is a stranded wire in which a plurality of strands made of thin conductors are twisted together. However, it is also conceivable that the core wire 910 is a single wire.

  The end portion of the insulated wire 9 to which the crimp terminal 10 is attached is in a state where the insulation coating 920 has been peeled off from the periphery of the core wire 910 of a certain length in advance, that is, the core wire 910 of a certain length extends from the insulation coating. It is processed to the state that it came out.

  Hereinafter, the core wire 910 extending from the end of the insulation coating 920 at the end portion of the insulated wire 9 is referred to as a bare core wire portion 91. In addition, a portion in a certain range (a range having a length of about several millimeters to several tens of millimeters) of the end portion of the insulating coating 920 of the insulated wire 9 is referred to as a covering end portion 92.

  In the terminal-attached electric wire 1, the core wire 910 of the insulated electric wire 9 is, for example, a metal wire whose main component is aluminum. On the other hand, the insulation coating 920 of the insulated wire 9 is a synthetic resin member mainly composed of, for example, polyethylene, vinyl chloride, or polyamide-based nylon. It is also conceivable that the core wire 910 is a metal wire mainly composed of copper.

<Crimp terminal>
As shown in FIGS. 1 to 3, the crimp terminal 10 is formed in a line along the linear direction, the coated crimp part 20, the first connecting part 30, the core crimping part 40, the second connecting part 50, and the like. A contact portion 60 is provided.

  Further, the linear direction from the coated crimping part 20 to the core crimping part 40 and the contact part 60 in the crimping terminal 10 is referred to as an extending direction. The extending direction is also the longitudinal direction of the insulated wire 9 to which the crimp terminal 10 is attached.

  The crimp terminal 10 is obtained by bending a metal plate material. Moreover, the metal plate material which comprises the crimp terminal 10 is obtained by the punching process with respect to the plate-shaped metal base material in which plating was formed. Accordingly, the metal plate material constituting the crimp terminal 10 is constituted by a base material and plating formed on the surface of the base material.

  For example, the base material of the crimp terminal 10 is a member made of a metal material whose main component is copper, such as copper or a copper alloy. In this case, the entire crimp terminal 10 including plating is made of a metal material mainly composed of copper. On the other hand, the plating is a member made of a metal material mainly composed of tin, such as tin (Sn) or tin alloy in which silver (Ag), copper (Cu), bismuth (Bi) or the like is added to tin.

<Crimp terminal: Coated crimp part>
The coated crimping portion 20 is a plate-like portion formed by bending, and forms a groove into which the coated end portion 92 of the insulated wire 9 is inserted before being crimped to the insulated wire 9. In the terminal-attached electric wire 1, the coated crimping portion 20 is crimped to the coated end portion 92 by being bent along the periphery of the coated end portion 92 inserted inside the groove formed by the coated crimped portion 20. Yes.

  The coated end portion 92 is strongly compressed by the pressure of the coated crimp portion 20 of the crimp terminal 10. Thereby, the outer peripheral surface of the covering end 92 is in close contact with the inner surface of the covering crimping portion 20.

  The covering crimping part 20 has a bottom plate part 21 and two covering caulking parts 22. The bottom plate portion 21 is a portion that supports the covered end portion 92 of the insulated wire 9 to which the crimp terminal 10 is attached from one direction (downward). The two covering caulking portions 22 are portions formed so as to stand up from the bottom plate portion 21 to both sides of the covering end portion 92.

  Hereinafter, a direction orthogonal to the stretching direction and facing the two covering caulking portions 22 is referred to as a width direction. Furthermore, a direction orthogonal to the stretching direction and the width direction is referred to as a height direction. Accordingly, the bottom plate portion 21 supports the covered end portion 92 of the insulated wire 9 from one side in the height direction.

  A portion occupying a part of the front end side of each of the covering caulking portions 22 is bent in a direction facing the bottom plate portion 21 and caulked to the covering end portion 92 to form an upper surface of the covering crimping portion 20. Moreover, the part which occupies a part of range of the root side in each covering crimping part 22 forms the both side surfaces of the covering crimping part 20.

  In the present specification, the terms “bottom surface”, “side surface”, and “upper surface” of the coated crimping portion 20 are used to distinguish the four surfaces of the coated end portion 92 for convenience, and the electric wire with terminal 1 is laid. It is not related to the vertical and horizontal directions in the state.

  The coated crimping portion 20 shown in the present embodiment is a butting type that is crimped in a state where a pair of tip edge portions 221 are butted. The pair of tip edge portions 221 are the edge portions of the tips of the two covering caulking portions 22. In addition, it is also conceivable that the covering crimping part 20 is a superposition type in which the two covering caulking parts 22 are crimped in a state where a part thereof overlaps.

<Crimp terminal: Core wire crimping part>
The core wire crimping portion 40 is a plate-like portion bent and formed in a state before being crimped to the insulated wire 9, and forms a groove into which the bare core wire portion 91 of the insulated wire 9 is inserted. And the core wire crimping part 40 is crimped | bonded with respect to the bare core wire part 91 inserted inside the groove | channel which the core wire crimping part 40 forms.

  The core wire crimping portion 40 includes a bottom plate portion 41 and two core wire caulking portions 42. The bottom plate portion 41 is a portion that supports the bare core wire portion 91 in the insulated wire 9 to which the crimp terminal 10 is attached from one side in the height direction. Further, the two core wire caulking portions 42 are portions formed so as to stand up from the bottom plate portion 41 to both sides of the bare core wire portion 91.

  A portion occupying a part of the distal end side of each core caulking portion 42 is bent in a direction facing the bottom plate portion 41 and caulked to the bare core wire portion 91. The core wire crimping portion 40 shown in the present embodiment is a butting type in which the two core wire crimping portions 42 do not overlap. However, it is also conceivable that the core wire crimping portion 40 is a superposed type in which two core wire caulking portions 42 are overlapped and caulked to the bare core wire portion 91, or a closed barrel type formed in a cylindrical shape.

<Crimp terminal: First connection part>
The first connecting portion 30 is a portion that connects the coated crimping portion 20 and the core wire crimping portion 40. The first connecting portion 30 is a plate-like portion formed by bending, and forms a groove into which a boundary portion between the covering end portion 92 and the bare core wire portion 91 is inserted. And the 1st connection part 30 is two bottom plates 31 which connected the bottom plate part 21 of the coating crimping part 20 and the bottom plate part 41 of the core wire crimping part 40, and extended from the bottom plate part 31 to both sides of the insulated wire 9. And a side wall portion 32.

<Crimp terminal: Contact part>
The contact portion 60 is a portion that comes into direct contact with the mating terminal by fitting with a mating terminal (not shown) to which the crimp terminal 10 is connected. The contact portion 60 shown in FIG. 1 is a cylindrical portion in which a terminal insertion hole 61 that is a hole into which a mating terminal is fitted is formed. In addition, the contact part 60 may be a rod-shaped conductor fitted in the terminal insertion hole of the counterpart terminal.

<Crimp terminal: Second connection part>
The second connecting portion 50 is a portion that connects the core wire crimping portion 40 and the contact portion 60. The 2nd connection part 50 is the plate-shaped part formed by bending, and forms the groove | channel. The leading end portion of the bare core wire portion 91 may protrude from the core wire crimping portion 40 into the groove formed by the second connecting portion 50, but it may not be the case. And the 2nd connection part 50 has the baseplate part 51 connected with the baseplate part 41 of the core wire crimping part 40, and the two side wall parts 52 extended from the baseplate part 51 and stood up.

  In the terminal-attached electric wire 1, it is conceivable that the core wire 910 and the crimp terminal 10 of the insulated electric wire 9 are made of different metals.

  For example, it is conceivable that the core wire 910 is an aluminum wire, that is, a metal wire (aluminum or aluminum alloy) mainly composed of aluminum. On the other hand, the crimp terminal 10 is plated with a tin alloy in which tin (Sn) or tin (Ag), copper (Cu), bismuth (Bi) or the like is added to a copper alloy base material such as copper or brass. It is conceivable that the member has been applied. In this case, the bare core wire portion 91 that comes into contact with the crimp terminal 10 is likely to be corroded by dissimilar metal contact corrosion.

<Anti-corrosion structure>
An anticorrosion structure is provided at the end of the insulated wire 9 in the terminal-attached electric wire 1 to prevent corrosion of the bare core wire portion 91 and the core wire crimping portion 40 by preventing intrusion of moisture and the like. The anticorrosion structure in the terminal-attached electric wire 1 includes a heat-shrinkable tube 8 and a water stop resin portion 7.

<Anti-corrosion structure: heat-shrinkable tube>
The heat-shrinkable tube 8 is a heat-shrinkable cylindrical member such as polyolefin, fluorine-based resin, chlorine-based resin, or thermoplastic elastomer. In the terminal-attached electric wire 1, the heat-shrinkable tube 8 encloses a part of the covering end portion 92 of the insulated electric wire 9 and is in close contact with the inclusion in a contracted state by being heated.

  In the following description, the edge on the core crimping part 40 side of the coated crimping part 20 of the crimping terminal 10 is referred to as a first edge 201, and the opposite edge is referred to as a second edge 202.

  The heat-shrinkable tube 8 includes a region straddling the second edge 202 of the coated crimping portion 20 in the terminal-attached electric wire 1 in a state where it is contracted by receiving heat. The heat-shrinkable tube 8 is in close contact with the outer surface of the coated crimping part 20 and the outer peripheral surface of the insulating coating 920 in a region straddling the second edge 202 of the coated crimped part 20 in the terminal-attached electric wire 1.

  That is, the heat-shrinkable tube 8 has an outer peripheral surface of the insulating coating 920 and a coating crimping portion 20 in a region extending from a portion that does not contact the crimping terminal 10 in the insulating coating 920 portion of the insulated wire 9 to a portion where the coating crimping portion 20 is crimped. Close to the outer surface of the.

  In the terminal-attached electric wire 1, a layer of a thermoplastic adhesive 80 that bonds the heat-shrinkable tube 8 to the outer surface of the coated crimping portion 20 and the outer peripheral surface of the insulating coating 920 is provided on the inner surface of the heat-shrinkable tube 8. Is formed. The heat-shrinkable tube 8 is in intimate contact with the coated crimping portion 20 and the insulating coating 920 through the adhesive 80 layer.

  The layer of the adhesive 80 is formed on the inner surface of the heat shrinkable tube 8 before shrinkage. The adhesive 80 is made of a thermoplastic material having a melting point equal to or lower than the temperature at which the heat shrinkable tube 8 contracts. Therefore, when the heat-shrinkable tube 8 is heated and contracts, the adhesive 80 melts by receiving the heat, and bonds the heat-shrinkable tube 8 and the inclusion.

<Waterproof resin part>
A water stop resin portion 7 for preventing corrosion of the bare core wire portion 91 is formed at an end portion of the insulated wire 9 in the electric wire with terminal 1. The water-stopping resin portion 7 is a synthetic resin coating that covers the bare core wire portion 91 of the insulated wire 9 from the outside of the crimp terminal 10. The water stop resin portion 7 is made of a member obtained by solidifying a fluid synthetic resin.

  The water stop resin portion 7 is, for example, a silicon-based, acrylic-based, urethane-based, polyamide-based, or epoxy-based synthetic resin. Moreover, in the example shown by FIGS. 1-3, the water stop resin part 7 is comprised with the transparent or translucent material. However, it is also conceivable that the water stop resin portion 7 is made of a resin that is not transparent. If the water-stopping resin part 7 is made of a colored translucent material, the thickness of the water-stopping resin part 7 can be easily confirmed.

  As shown in FIGS. 1 to 3, the water stop resin portion 7 covers a portion from the crimp boundary portion 901 that contacts the first edge 201 of the coated crimp portion 20 in the insulated wire 9 to the tip 902 of the core wire 910. Therefore, the water-stopping resin portion 7 covers a portion exposed from the crimp terminal 10 on the distal end side from the crimp boundary portion 901 in the insulated wire 9.

  Further, as shown in FIGS. 2 to 5, the water-stopping resin portion 7 is formed from the first edge portion 201 to the heat-shrinkable tube between a pair of tip edge portions 221 that are crimped to the covering end portion 92 in the covering pressure bonding portion 20. Block to the position in contact with 8. In the present embodiment, the water-stopping resin portion 7 extends from the first edge portion 201 of the pair of tip edge portions 221 that are crimped to the covering end portion 92 in the butted state in the covering pressure-bonding portion 20 to a position in contact with the heat shrinkable tube 8. It is formed so as to cover the area.

  Further, the rear end portion 71 which is the end portion on the coated crimping portion 20 side in the water-stopping resin portion 7 is between the leading edge portion 221 of the coated crimping portion 20 and the end portion on the core crimping portion 40 side of the heat shrinkable tube 8. Is closed from the outer peripheral surface side of the heat shrinkable tube 8. That is, after the heat-shrinkable tube 8 is heated so as to be in close contact with the outer surface of the coated crimping portion 20, the water-stopping resin portion 7 is formed.

  As described above, the water-stopping resin portion 7 fills the gap between the pair of tip edge portions 221 in the range from the first edge portion 201 of the coated crimping portion 20 to the heat shrinkable tube 8. Further, the rear end portion 71 of the water-stopping resin portion 7 is between the pair of tip edge portions 221 of the cover crimping portion 20 and the end portion on the core crimping portion 40 side of the heat shrinkable tube 8 between the pair of tip edge portions 221. Filling the gap.

<Procedure for manufacturing anticorrosion structure>
Next, an example of a manufacturing procedure of the anticorrosion structure in the terminal-attached electric wire 1 will be described with reference to FIGS. FIG. 6 is a perspective view showing how the heat-shrinkable tube 8 is positioned at the end of the terminal-attached electric wire 1. FIG. 7 is a perspective view showing how the heat-shrinkable tube 8 is heated. FIG. 9 is a perspective view illustrating a state in which the fluid synthetic resin 70 is supplied to the end portion of the terminal-attached electric wire 1.

  Before the anticorrosion structure in the electric wire with terminal 1 is formed, the crimp terminal 10 is crimped to the end of the insulated wire 9 that has been passed through the heat-shrinkable tube 8 in advance. The inner diameter of the heat-shrinkable tube 8 before being heated is larger than the maximum outer diameter of the coated crimping portion 20 of the end portion of the insulated wire 9 and the crimp terminal 10 crimped to the end portion.

  The adhesive 80 before being welded to the end of the insulated wire 9 by heating is formed on the inner surface of the heat shrinkable tube 8. In the present embodiment, the adhesive 80 is formed on the entire inner surface of the heat shrinkable tube 8.

  Then, after the crimp terminal 10 is crimped to the end of the insulated wire 9, the heat shrinkable tube 8 does not contact the crimp terminal 10 in the insulating coating 920 portion of the insulated wire 9 as shown in FIGS. It is positioned at a position from the portion to the intermediate position of the covering crimping portion 20 through the second edge 202 of the covering crimping portion 20.

  Next, as shown in FIG. 7, the positioned heat-shrinkable tube 8 is heated by the heater 100. As a result, the heat shrinkable tube 8 shrinks to a state in which its inner surface is in close contact with the outer surface of the coating crimping portion 20 and the outer peripheral surface of the insulating coating 920. At that time, the layer of the adhesive 80 made of the thermoplastic resin is melted, and the inner surface of the heat-shrinkable tube 8 is bonded to the outer surface of the coated crimping portion 20 and the outer peripheral surface of the insulating coating 920 by the adhesive 80.

  The layer of the adhesive 80 prevents a gap from being generated between the heat-shrinkable tube 8 and the coated crimping portion 20 and prevents the heat-shrinkable tube 8 from being displaced with respect to the insulated wire 9. In addition, if the layer of the adhesive 80 is formed over the entire circumferential direction on at least the inner side surfaces of the both ends of the heat shrinkable tube 8, the space between the cover crimping portion 20 and the insulating coating 920 is sealed and heat shrinks. It fulfills the function of preventing the displacement of the tube 8.

  Next, as shown in FIG. 8, the fluid synthetic resin 70 is supplied to a region from the tip 902 of the bare core wire portion 91 to which the core wire crimp portion 40 of the terminal-attached electric wire 1 is crimped to the heat shrinkable tube 8. The The water stop resin portion 7 is formed by supplying a fluid synthetic resin 70 to the end of the insulated wire 9 from above. The fluid synthetic resin 70 is supplied by the dispenser 101. The synthetic resin flowing down to the end of the insulated wire 9 is solidified through a predetermined solidification process.

  For example, when the water-stopping resin portion 7 is made of a thermoplastic resin, the solidification process is a cooling process. Moreover, when the water stop resin part 7 consists of moisture solidification resin, a solidification process is a process of exposing moisture solidification resin to the air containing moisture for a predetermined time. Moreover, when the water stop resin part 7 consists of ultraviolet curable resin, a solidification process is a process of irradiating an ultraviolet light. Moreover, when the fluid synthetic resin 70 is a thermosetting resin, the solidification process is a heating process.

<Effect>
In the terminal-attached electric wire 1, the water-stopping resin portion 7 covers a portion of the insulated wire 9 that is exposed from the crimp terminal 10 on the core wire crimp portion 40 side with respect to the coated crimp portion 20 of the crimp terminal 10. Therefore, the water-stopping resin portion 7 prevents liquid from entering the bare core wire portion 91 from the outside of the crimp terminal 10.

  On the other hand, the heat shrinkable tube 8 seals between the outer peripheral surface of the insulating coating 920 in the insulated wire 9 and the coated crimping portion 20 in the crimp terminal 10 in the entire circumferential direction of the insulated wire 9. By the action of the heat shrinkable tube 8, it is possible to prevent a gap that leads to the bare core wire portion 91 from being formed between the insulating coating 920 and the coating crimping portion 20.

  Further, the water-stopping resin portion 7 fills a space between the pair of tip edge portions 211 of the cover crimping portion 20 that is caulked to the insulated wire 9. Further, the water-stopping resin portion 7 closes a space between the pair of tip edge portions 211 of the coated crimping portion 20 and the end portion of the heat shrinkable tube 8. Therefore, it is also possible to prevent the liquid from entering the bare core wire portion 91 from between the pair of tip edge portions 211 of the coated crimping portion 20.

  In addition, when the water-stopping resin portion 7 is formed by flowing down the fluid synthetic resin 70, the surface of the water-stopping resin portion 7 is unlikely to be a smooth shape. Therefore, when the heat shrinkable tube 8 covers the coated crimping portion 20 from the outside of the water-stopping resin portion 7 formed on the surface, a gap is likely to be generated between the heat-shrinkable tube 8 and the waterstop resin portion 7.

  In the terminal-attached electric wire 1, the rear end portion 71 of the water-stopping resin portion 7 is between the pair of tip edge portions 211 of the coated crimping portion 20 and the end portions of the heat-shrinkable tube 8 on the outer peripheral surface side of the heat-shrinkable tube 8 Close from. That is, after the heat-shrinkable tube 8 is heated so as to be in close contact with the outer surface of the coated crimping portion 20, the water-stopping resin portion 7 is formed. Therefore, the heat-shrinkable tube 8 is in close contact with the outer surface of the coated crimping portion 20 without any gap, and the water-stopping effect of the heat-shrinkable tube 8 is enhanced.

  Moreover, attaching the heat-shrinkable tube 8 to the terminal-attached electric wire 1 is easier than applying a process for forming a groove to the crimp terminal 10. That is, the heat shrinkable tube 8 can be attached by a very simple process of heating the heat shrinkable tube 8 after passing the insulated wire 9 through the hollow portion of the heat shrinkable tube 8.

  From the above, if the terminal-attached electric wire 1 is employed, it is possible to easily prevent a gap from being formed inside the cover crimping portion 20 of the crimp terminal 10. As a result, corrosion of the bare core wire portion 91 and the core wire crimping portion 40 of the insulated wire 9 can be prevented.

  In addition, when the core wire 910 and the crimp terminal 10 are made of different types of metal materials, when the liquid enters the bare core wire portion 91, different metal contact corrosion is particularly likely to occur. However, if the terminal-attached electric wire 1 is employed, it is possible to prevent contact corrosion of dissimilar metals even in such a case.

  Even when the core wire 910 and the crimp terminal 10 are made of the same type of metal, the structure of the terminal-attached electric wire 1 is effective for preventing corrosion at a portion where the bare core wire portion 91 and the crimp terminal 10 are in contact with each other. .

  A layer of thermoplastic adhesive 80 bonds the inner surface of the heat-shrinkable tube 8 to the outer surface of the coated crimping portion 20 and the outer peripheral surface of the insulating coating 920. In this case, the sealing property of the end portion of the insulated wire 9 by the heat shrinkable tube 8 is further enhanced, which is preferable. Furthermore, the position shift of the heat shrinkable tube 8 with respect to the insulated wire 9 is prevented.

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In the electric wire with terminal 1, it is also conceivable that the layer of the adhesive 80 is not formed on the inner surface of the heat shrinkable tube 8. Even in this case, excellent water stoppage is ensured.

  The electric wire with terminal according to the present invention can be configured by appropriately modifying the embodiment shown above or omitting a part thereof within the scope of the invention described in each claim. is there.

DESCRIPTION OF SYMBOLS 1 Electric wire with a terminal 7 Water stop resin part 8 Second water stop resin part 9 Insulated wire 10 Crimp terminal 20 Cover crimp part 21 Bottom plate part of cover crimp part 22 Cover crimp part 30 First connection part 31 Bottom plate part of the first connection part 32 Side wall portion of the first connecting portion 40 Core wire crimping portion 41 Bottom plate portion of the core wire crimping portion 42 Core wire crimping portion 50 Second connecting portion 51 Bottom plate portion of the second connecting portion 52 Side wall portion of the second connecting portion 60 Contact portion 61 Terminal insertion Hole 70 Flowing synthetic resin 71 Rear end portion of water-stopping resin portion 80 Adhesive 91 Bare core portion 92 Covered end portion 100 Heater 101 Dispenser 201 First edge portion of coated crimp portion 202 Second edge portion of coated crimp portion 221 Leading edge portion of coated crimping portion 901 Crimping boundary portion of insulated wire 902 Leading end of core wire 910 Core wire 920 Insulating coating

Claims (3)

Insulated wires,
A crimping terminal having a core crimping part and a crimping part crimped to each of the insulation coating part of the insulated wire and the core wire extending from the insulation coating;
The outer surface of the coated crimping portion and the outer periphery of the insulating coating in a region straddling the second edge opposite to the first edge on the core crimping portion side in the coated crimping portion in a contracted state due to heat A heat-shrinkable tube in close contact with the surface,
It consists of a member in which a fluid synthetic resin is solidified, covers a portion exposed from the crimp terminal on the tip side from a portion in contact with the first edge of the coated crimp portion in the insulated wire, and in the coated crimp portion The gap between the pair of tip edge portions crimped to the insulated wire is covered from the first edge portion to a position in contact with the heat shrinkable tube, and the tip edge portion of the coated crimping portion and the heat shrinkable tube. And a water-stopping resin portion that closes the space between the end portion of the heat-shrinkable tube from the outer peripheral surface side. It is an electric wire with a terminal according to claim 1,
A terminal-attached electric wire in which a layer of a thermoplastic adhesive that bonds the heat-shrinkable tube, the outer surface of the coated crimping portion, and the outer peripheral surface of the insulating coating is formed on the inner surface of the heat-shrinkable tube. It is an electric wire with a terminal according to claim 1 or claim 2,
The core wire of the insulated wire is made of a metal material mainly composed of aluminum,
The crimp terminal is an electric wire with a terminal made of a metal material mainly composed of copper.

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