JP2018106863A - Terminal-equipped wire and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an increase in the thickness of a terminal-equipped wire while preventing corrosion of an exposed part of a core wire of the terminal-equipped wire.SOLUTION: A terminal-equipped wire includes: a wire which includes a core wire and an insulation coating covering the outer periphery of the core wire while avoiding the end of the core wire; a terminal which includes a bottom part and a core wire crimping piece protruding from a part of the bottom part and in which the core wire crimping piece is crimped to the end of the core wire; an adhesive which covers an exposed part out of the end of the core wire while avoiding the outer surface of the bottom part of the terminal; and an adhesive film which is adhered to an upper surface exposed part by the adhesive covering the upper surface exposed part directed to the direction away from the bottom part out of the exposed part of the core wire while avoiding the outer surface of the bottom part of the terminal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a terminal-attached electric wire.

  In Patent Document 1, an electric wire having an exposed core wire portion, a terminal connected to the exposed core wire portion, and a connection portion between the exposed core wire portion and the terminal are disposed in front of the counterpart connection portion of the terminal. An electric wire with a terminal provided with a heat-shrinkable tube installed and attached to the connection portion by heat-shrinking is shown. The core wire is an aluminum alloy, and the terminal is formed by forming a tin plating layer on the surface of a copper alloy. The connection portion between the exposed core portion and the terminal is covered with the heat shrinkable tube, so that the exposed core portion is protected from corrosion.

JP 2012-74177 A

  However, in the electric wire with terminal of Patent Document 1, since the thickness of the electric wire with terminal increases as the heat shrinkable tube covers the entire circumference of the connection portion between the exposed core portion and the terminal, the clearance between the connector housing and the electric wire with terminal is increased. There is a problem of lack of.

  This invention was made in order to solve such a problem, and it aims at providing the technique which can suppress the increase in the thickness of an electric wire with a terminal, preventing corrosion of the exposed part of the core wire of an electric wire with a terminal.

  In order to solve the above-described problem, the terminal-attached electric wire according to the first aspect includes an electric wire including a core wire, an insulating coating that covers an outer periphery of the core wire while avoiding an end portion of the core wire, a bottom portion, and the bottom portion. A core wire crimping piece projecting from a part of the terminal, the core wire crimping piece being crimped to the end portion of the core wire, and the end portion of the core wire avoiding the outer surface of the bottom portion of the terminal The outer surface of the bottom portion of the terminal is avoided by the adhesive covering the exposed portion and the adhesive covering the upper surface exposed portion facing the direction away from the bottom portion of the exposed portion of the core wire. And an adhesive film bonded to the upper surface exposed portion.

  The electric wire with a terminal according to the second aspect is the electric wire with a terminal according to the first aspect, wherein the adhesive covering the upper surface exposed portion of the core wire has the adhesive film exposed to the upper surface of the core wire. The adhesive film and the upper surface exposed portion are bonded to form a shape along the portion.

  The electric wire with a terminal according to the third aspect is an electric wire with a terminal according to the first or second aspect, wherein a tip end portion of the core wire is on the side opposite to the insulating coating from the core wire crimping piece of the terminal. A portion of the adhesive film protrudes from the tip portion of the core wire to the side opposite to the insulating coating, and the adhesive covering the tip surface of the core wire in the exposed portion of the core wire is , And also to the part of the adhesive film.

  The electric wire with a terminal according to the fourth aspect is an electric wire with a terminal according to the third aspect, and a part of the adhesive film protrudes from the tip portion of the core wire to the side opposite to the insulating coating. The part of the adhesive film is bent toward the tip surface side of the core wire.

  According to the fifth aspect of the method of manufacturing the electric wire with terminal, the core wire crimping piece protruding from a part of the bottom portion of the terminal is crimped to the end exposed from the insulating coating of the core wire of the electric wire, It is a manufacturing method of the electric wire with a terminal by which anticorrosion processing is carried out to the exposure part among the above-mentioned end parts, and the adhesive agent application process which applies an adhesive agent to the above-mentioned exposure part so that the above-mentioned exposure part of the above-mentioned core wire may be covered, An adhesive film having a size that can be adhered to the upper surface exposed portion so as to cover the upper surface exposed portion facing away from the bottom portion of the exposed portion of the core wire while avoiding the outer surface of the bottom portion of the terminal. An adhesive film placing step of placing the adhesive on the adhesive applied so as to cover the exposed portion of the core wire in an arrangement capable of bonding; and between the upper surface exposed portion of the core wire and the adhesive film The amount of adhesive present and in front of the bottom of the terminal Comprising an adhesive reducing step of reducing the amount of the adhesive agent adhering to the outer surface.

  The manufacturing method of the electric wire with a terminal which concerns on a 6th aspect is a manufacturing method of the electric wire with a terminal which concerns on a 5th aspect, Comprising: The front-end | tip part of the said core wire is the said insulation coating from the said core wire crimping piece of the said terminal. In the adhesive film mounting step, the adhesive film is placed on the adhesive applied so as to cover the exposed portion of the core wire, and a part of the adhesive film is insulated from the tip portion of the core wire. In this step, the adhesive film is placed so as to protrude to the opposite side of the coating.

  The manufacturing method of the electric wire with a terminal which concerns on a 7th aspect is a manufacturing method of the electric wire with a terminal which concerns on the 5th or 6th aspect, Comprising: The said adhesive reduction process is the said core wire with respect to the said bottom part of the said terminal. The atmosphere around the adhesive film is sucked from the side opposite to the exposed part of the substrate, and the adhesive film is pressed against the upper surface exposed part of the core wire to exist between the upper surface exposed part and the adhesive film. Including a step of reducing the amount of adhesive.

  According to the first aspect of the present invention, the terminal-attached electric wire is formed by the adhesive covering the exposed portion of the core wire of the electric wire while avoiding the outer surface of the bottom portion of the terminal, and the adhesive covering the exposed portion. And an adhesive film adhered to the upper surface exposed portion facing away from the bottom of the terminal, avoiding the outer surface of the bottom of the terminal. Therefore, adhesion of the adhesive and the adhesive film to the outer side surface of the bottom of the terminal is suppressed, and the exposed portion of the core wire is covered with the adhesive. Further, since the upper surface exposed portion is covered with the adhesive film, the amount of the adhesive sandwiched between the upper surface exposed portion and the adhesive film can be reduced while suppressing the exposure of the upper surface exposed portion to the outside. Thereby, the increase in the thickness of the electric wire with a terminal can be suppressed, preventing corrosion of the exposed portion of the core wire.

  According to the invention according to the second aspect, the adhesive bonds the adhesive film and the upper surface exposed portion so that the adhesive film has a shape along the upper surface exposed portion of the core wire. Therefore, the amount of the adhesive sandwiched between the upper surface exposed portion and the adhesive film can be further reduced.

  According to the third aspect of the invention, the tip end portion of the core wire protrudes from the core wire crimping piece of the terminal to the side opposite to the insulating coating, and a part of the adhesive film is opposite to the insulating coating from the tip portion of the core wire. The part which protrudes to the side and covers the front end surface of the core wire of the adhesive is also bonded to the part of the adhesive film. Accordingly, since the adhesive is in contact with both the adhesive film and the front end surface of the core wire at the front end of the core wire, the adhesive is stably held, and the decrease in the adhesive attached to the front end surface of the core wire can be suppressed. Thereby, the anticorrosion effect of the front-end | tip of a core wire can be improved.

  According to the fourth aspect of the invention, a part of the adhesive film protrudes from the tip end portion of the core wire to the side opposite to the insulating coating. The part of the adhesive film is bent toward the distal end side of the core wire. Accordingly, at the tip of the core wire, the adhesive is sandwiched between both the bent portion of the adhesive film and the tip surface of the core wire, so that the adhesive is further stably held and adheres to the tip surface of the core wire. Can be further suppressed. Thereby, the anticorrosion effect of the front-end | tip of a core wire can further be improved.

  According to the fifth aspect of the present invention, the adhesive is applied to the exposed portion so as to cover the exposed portion of the core wire, and the direction away from the bottom portion of the exposed portion of the core wire is avoided while avoiding the outer surface of the bottom portion of the terminal. An adhesive film having a size capable of being bonded to the upper surface exposed portion so as to cover the upper surface exposed portion is placed on the adhesive in an arrangement capable of the bonding. And the quantity of the adhesive agent which exists between the upper surface exposed part of a core wire, and an adhesive film and the quantity of the adhesive agent adhering to the outer surface of the bottom part of a terminal are reduced. Therefore, adhesion of the adhesive and the adhesive film to the outer side surface of the bottom of the terminal is suppressed, and the exposed portion of the core wire is covered with the adhesive. In addition, the film thickness of the adhesive sandwiched between the upper surface exposed portion and the adhesive film can be suppressed. Thereby, the increase in the thickness of the electric wire with a terminal can be suppressed, protecting the exposed part of the core wire of the electric wire with a terminal manufactured.

  According to the sixth aspect of the invention, the tip end portion of the core wire protrudes from the core wire crimping piece of the terminal to the side opposite to the insulating coating, and a part of the adhesive film is opposite to the insulating coating from the tip portion of the core wire. It is placed on the adhesive so that it protrudes to the side. Therefore, at the tip of the core wire, the adhesive is in contact with both a part of the adhesive film and the tip surface of the core wire, so that the adhesive is stably held and the adhesive adhered to the tip surface of the core wire is reduced. Can be suppressed. Thereby, the anticorrosion effect of the front-end | tip of a core wire can be improved.

  According to the seventh aspect of the invention, the atmosphere around the adhesive film is sucked from the side opposite to the exposed portion of the core wire against the bottom of the terminal, and the adhesive film is pressed against the exposed portion of the upper surface of the core wire. As a result, the amount of the adhesive existing between the upper surface exposed portion and the adhesive film is reduced. Therefore, the film thickness of the adhesive between the exposed portion of the core wire and the adhesive film can be reduced more efficiently.

It is a schematic side view which shows the electric wire with a terminal which concerns on embodiment. It is a schematic plan view which shows the electric wire with a terminal of FIG. It is sectional drawing in the A1-A1 cut surface of the electric wire with a terminal of FIG. It is a schematic perspective view which shows the terminal of the electric wire with a terminal of FIG. It is a flowchart which shows the manufacturing process of the electric wire with a terminal of FIG. It is explanatory drawing which shows the manufacturing process of the electric wire with a terminal of FIG. It is explanatory drawing which shows the manufacturing process of the electric wire with a terminal of FIG. It is explanatory drawing which shows the manufacturing process of the electric wire with a terminal of FIG. It is explanatory drawing which shows the manufacturing process of the electric wire with a terminal of FIG. It is explanatory drawing which shows the manufacturing process of the electric wire with a terminal of FIG. It is explanatory drawing which shows the manufacturing process of the electric wire with a terminal of FIG. It is explanatory drawing which shows the manufacturing process of the electric wire with a terminal of FIG. It is explanatory drawing which shows the manufacturing process of the electric wire with a terminal of FIG.

  Hereinafter, the electric wire with a terminal concerning the embodiment and its manufacturing method are explained.

<Wire with terminal>
First, a terminal-attached electric wire according to an embodiment to be manufactured will be described with reference to FIGS. 1 to 4. Drawing 1 is an outline side view showing electric wire 10 with a terminal concerning an embodiment. FIG. 2 is a schematic plan view showing the terminal-attached electric wire 10. FIG. 3 is a cross-sectional view of the terminal-attached electric wire 10 at the A1-A1 cut surface. FIG. 4 is a schematic perspective view showing the terminal 20.

  The terminal-attached electric wire 10 includes an electric wire 12, a terminal 20, an adhesive 18, and a film 19.

  The electric wire 12 includes a core wire 13 and a coating (“insulation coating”) 14 that covers the outer periphery of the core wire 13 while avoiding the end portion 13 a of the core wire 13. The core wire 13 is a linear conductor, and here, the core wire 13 is formed by twisting a plurality of strands. The coating 14 is made of an insulating material such as resin. The coating 14 is formed, for example, by extrusion-coating a softened resin around the core wire 13.

  Further, a coating 14 having a predetermined length is peeled off from the core wire 13 at the end of the electric wire 12. Thereby, the edge part 13a which the core wire 13 exposes over predetermined length is provided in the edge part of the electric wire 12. FIG.

  The terminal (“metal terminal”) 20 is a member formed by pressing a metal plate material, which is a conductive plate material, and directly contacts a mating conductor C as a mating electrical connection element. A connecting portion 28 and a wire connecting portion 22 connected to the counterpart connecting portion 28 are provided.

  The wire connecting portion 22 includes a distal end side connecting portion 23, a core wire crimping portion 24, an intermediate connecting portion 25, and a covering crimping portion 26. The distal end side connecting portion 23, the core wire crimping portion 24, the intermediate connecting portion 25, and the covering crimping portion 26 are formed in a line along the linear direction. In the present embodiment, in the present terminal 20, the counterpart connection portion 28 side is described as the distal end side of the terminal 20, and the wire connection portion 22 side is described as the proximal end side of the terminal 20.

  The covering crimping portion 26 is a portion that is crimped to the end portion of the covering 14 of the electric wire 12 by being crimped. The covering crimping portion 26 includes a bottom plate portion 26a and a pair of covering crimping pieces 26b that are erected on both sides of the bottom plate portion 26a and face each other. In the example shown in FIG. 3, the pair of coated crimping pieces 26 b are erected vertically to the bottom plate portion 26 a, but this is not always necessary. For example, of the pair of coated crimping pieces 26b, the edge portion on the distal end side of the terminal 20 is formed in a shape inclined toward the proximal end side of the terminal 20 toward the distal end side in the standing direction of each coated crimped piece 26b. It is also possible.

  The intermediate connecting portion 25 is a portion that connects the coated crimping portion 26 and the core wire crimping portion 24. The intermediate connecting portion 25 includes a bottom plate portion 25a and a pair of side wall portions 25b that are erected on both sides of the bottom plate portion 25a and face each other.

  The core wire crimping portion 24 is a portion that is crimped to the end portion 13a of the core wire 13 by being crimped. The core wire crimping portion 24 includes a bottom plate portion 24a and a pair of core wire crimping pieces 24b that are erected on both sides of the bottom plate portion 24a and face each other.

  In the present embodiment, the description will be made assuming that the direction in which the pair of core wire crimping pieces 24 b face each other is the width direction of the terminal 20. In addition, a description will be given assuming that the direction in which the pair of core wire crimping pieces 24 b is erected with respect to the bottom plate portion 24 a is the height direction of the terminal 20. The length of the terminal 20 is the direction orthogonal to both the width direction and the height direction of the terminal 20 (the direction in which the distal end side connecting portion 23, the core wire crimping portion 24, the intermediate coupling portion 25, and the covering crimping portion 26 are arranged in a line). It is assumed that the direction is.

  The distal end side connecting portion 23 is a portion that connects the core wire crimping portion 24 and the counterpart connecting portion 28. The distal end side connecting portion 23 includes a bottom plate portion 23a and a pair of side wall portions 23b that are erected on both sides of the bottom plate portion 23a and face each other.

  Each bottom plate part 23a, 24a, 25a, 26a in the electric wire connection part 22 is formed in the shape which continues in plate shape as a whole, and a part of the bottom part 22a of the electric wire connection part 22, ie, the bottom part 20a of the terminal 20, is formed as a whole. It is made. The inner side surface 20b is one main surface of the bottom portion 20a. The electric wire 12 to be crimped to the terminal 20 is placed on a portion of the inner side surface 20b corresponding to the bottom portion 22a of the electric wire connecting portion 22. The outer side surface 20c is the other main surface of the bottom portion 20a. Moreover, the side wall part 23b, the core wire crimping piece 24b, the side wall part 25b, and the covering crimping piece 26b on one side in the width direction of the electric wire connection part 22 are formed in a shape that is continuous in a plate shape as a whole. Similarly, the side wall part 23b, the core wire crimping piece 24b, the side wall part 25b, and the covering crimping piece 26b on the other side in the width direction in the electric wire connection part 22 are also formed in a shape that is continuous in a plate shape as a whole.

  Further, the coated crimping piece 26b of the coated crimping portion 26 and the core crimping piece 24b of the core wire crimping portion 24, which are portions crimped (bent) to the electric wire 12, are respectively the intermediate coupling portion 25 and the distal end side coupling portion 23. The side walls 25b and 23b are longer in the height direction. In a state before the crimping piece 26b and the core crimping piece 24b are crimped, the side wall 23b, the core crimping piece 24b, the sidewall 25b, and the covering crimping piece 26b on one side in the width direction of the electric wire connecting portion 22 are erected. The tip in the direction and the tip in the standing direction of the side wall 23b, the core crimping piece 24b, the side wall 25b, and the covering crimping piece 26b on the other side in the width direction are substantially the same size as the bottom 22a of the wire connecting part 22 22d is formed.

  The coated crimping piece 26b and the core wire crimping piece 24b protrude from the bottom plate portions 26a and 24a to the same side along the height direction of the terminal 20. Each of the bottom plate portions 26 a and 24 a is a part of the bottom portion 22 a of the wire connection portion 22, that is, a part of the bottom portion 20 a of the terminal 20. The core wire crimping piece 24 b is crimped to the end portion 13 a exposed from the coating 14 of the core wire 13.

  In addition, the counterpart connection portion 28 is a portion (terminal connection portion) that is in direct contact with the counterpart conductor C as the counterpart electrical connection element and connected to the counterpart conductor C. Here, the counterpart connection portion 28 is a cylindrical portion in which a terminal insertion hole 28h, which is a hole into which the counterpart terminal C1 is fitted, is formed. In the present embodiment, the mating connection portion 28 is formed in a rectangular tube shape, and a contact piece 29 that contacts the mating terminal C1 and elastically deforms is provided inside.

  Here, an example in which the mating side connection portion 28 is formed in a cylindrical terminal shape (so-called female terminal shape) will be described. However, the mating side connection portion 28 has an elongated rod-like or elongated plate-like terminal shape (so-called male terminal). (Shape) may be formed. Moreover, the other party connection part 28 may be formed in the shape which can be bolted, ie, the shape by which the through-hole was formed in the flat main body part.

  The terminal 20 is connected to the end of the electric wire 12 as follows. That is, the end of the coating 14 is positioned between the pair of coated crimping pieces 26 b in the coated crimping part 26, and the end 13 a of the core wire 13 is positioned between the pair of cored crimping pieces 24 b in the core wire crimping part 24. The electric wire 12 is arranged with respect to the terminal 20. In this state, the coated crimping piece 26b of the coated crimping portion 26 is bent (clamped) to the coating 14 side (inside) on the bottom plate portion 26a.

  Furthermore, the core wire crimping piece 24b of the core wire crimping portion 24 is bent (clamped) toward the end 13a side (inner side) on the bottom plate portion 24a. Thereby, in the covering crimping portion 26, the bottom plate portion 26a and the two covering crimping pieces 26b are held in a state where they are crimped to the end portion of the covering 14, and in the core wire crimping portion 24, the bottom plate portion 24a and the two core wires are held. The crimping piece 24b is held in a state of being crimped to the end portion 13a. At this time, the front end side edge portion of the covering 14 is located at the position of the intermediate connecting portion 25, and a part thereof is exposed between the side wall portions 25 b. Similarly, the distal end side edge portion of the end portion 13a of the core wire 13 is located at the position of the distal end side connecting portion 23, and a part thereof is exposed between the side wall portions 23b.

  Here, the core wire 13 (element wire) of the electric wire 12 and the terminal 20 are made of different metals having different standard electrode potentials (balanced electrode potentials). For example, the core wire 13 is made of aluminum or an aluminum alloy containing aluminum as a main component. On the other hand, the terminal 20 is made of copper or a copper alloy containing copper as a main component (brass, etc.), or tin (Sn) plating on these members, or silver (Ag), copper (Cu), bismuth on tin. This is a member plated with a tin alloy to which (Bi) or the like is added. Therefore, the dissimilar metal is in contact with the connecting portion between the core wire 13 and the terminal 20, and when an electrolyte such as salt water adheres to this portion, dissimilar metal contact corrosion may occur.

  Moreover, in the connection part of the terminal 20 and the electric wire 12, the edge part 13a of the core wire 13 is exposed outside at the following each part. That is, the base end portion of the end portion 13 a is exposed between the core wire crimping portion 24 and the covering crimping portion 26. Further, the tip of the end portion 13 a is exposed between the core wire crimping portion 24 and the counterpart connection portion 28. Further, since a pair of core wire crimping pieces 24b of the core wire crimping portion 24 is crimped to the end portion 13a, a gap may be generated between the tip portions in the protruding direction of the pair of core wire crimping pieces 24b. An intermediate portion of the end portion 13a can be exposed between the pieces 24b.

  The adhesive (“resin layer”) 18 is a fluidized (uncured) adhesive (“anticorrosive”) 18B (see FIGS. 12 and 13) supplied to the connection portion between the terminal 20 and the electric wire 12. The film to be formed is hardened (viscosity is increased). The adhesive 18 (adhesive 18B) covers the exposed portion QA of the end portion 13a of the core wire 13 while avoiding the outer surface 20c of the bottom portion 20a of the terminal 20. Thereby, the anticorrosion process is performed to the exposed part QA.

  The exposed portion QA of the core wire 13 is a portion exposed from the terminal 20 (more specifically, the wire connecting portion 22) of the end portion 13a of the core wire 13 that is not covered. Specifically, the exposed portion QA includes a base end side portion Q1 that is exposed to the coated crimping portion 26 side with respect to the core wire crimping portion 24 in the end portion 13a of the core wire 13, and a pair of core wire crimping pieces in the end portion 13a. The part which combined between the part Q2 exposed between the front-end | tip parts of the standing direction of 24b, and the front end side part Q3 exposed to the opposite side to the coating | compression-bonding crimping part 26 with respect to the core wire crimping part 24 among the edge parts 13a It is.

  That is, the base end side portion Q1 is a portion that is not in contact with the intermediate connecting portion 25 in the outer periphery of the core wire 13 between the core wire crimping portion 24 and the tip of the coating 14. When no gap is generated between the tip portions in the protruding direction of the pair of core wire crimping pieces 24b, the portion Q2 is not generated. The tip end portion (tip side edge portion) of the core wire 13 protrudes from the core wire crimping piece 24b of the terminal 20 to the side opposite to the coating 14, and the tip end portion Q3 is the tip end side of the outer peripheral surface of the tip end portion of the core wire 13. The portion that is not in contact with the connecting portion 23 and the front end surface S1 of the core wire 13.

  The exposed portion QA is a portion obtained by combining the portions Q1, Q2, and Q3 as described above. Since the cross-sectional shape of the core wire is substantially circular or substantially elliptical, the exposed portion QA includes a lower surface exposed portion QL facing the bottom portion 22a of the electric wire connecting portion 22 and an upper surface exposed facing the opposite direction to the bottom portion 22a (20a). It is also a part that combines the part QUA. In other words, the upper surface exposed portion QU is a portion facing the direction away from the bottom 22a (20a) in the exposed portion QA. In other words, the upper surface exposed portion QU is a portion of the exposed portion QA that is exposed to the end portion 13a of the core wire 13 when viewed from the side opposite to the bottom portion 22a (20a).

  The adhesive 18 covers the adhesion target region R1 and is cured in a state of being adhered to the adhesion target region R1. The adhesion target region R1 includes at least the exposed portion QA. The adhesion target region R1 may be a region wider than the exposed portion QA.

  In the example of FIGS. 1 and 2, the adhesion target region R <b> 1 further includes, in addition to the exposed portion QA, a standing direction distal end portion of the proximal end portions of the pair of side wall portions 23 b in the length direction of the terminal 20. . Further, the bonding target region R1 includes a pair of core wire crimping pieces 24b in a standing direction front end portion (a portion excluding a portion near the bottom portion 22a of the pair of core wire crimping pieces 24b) and a pair of side wall portions of the intermediate connecting portion 25. 25b may further include a front end side portion in the standing direction (a portion of the pair of side wall portions 25b excluding a portion near the bottom portion 22a). Further, the bonding target region R1 includes the front end side portion of the covering 14 and the front end side portion of the pair of covering crimping pieces 26b in the length direction of the terminal 20 (the pair of covering crimping pieces 26b). Of these, a portion excluding the vicinity of the bottom portion 22a) may be further included. Moreover, adhesion | attachment object area | region R1 does not include the bottom part 20a (22a) of the terminal 20 (electric wire connection part 22). The adhesion target region R1 is usually included in an application target region R2 described later, and is a region smaller than the application target region R2.

  Even after the terminal 20 is crimped to the electric wire 12 by crimping the core crimping portion 24 and the covering crimping portion 26 as in the distal end side coupling portion 23 shown as an example in FIG. 23 and the intermediate | middle connection part 25 maintain substantially the shape before the core wire crimping part 24 grade | etc., Is crimped. That is, even when the terminal 20 is crimped to the electric wire 12, the side wall portion 23b (25b) of the distal end side connecting portion 23 (intermediate connecting portion 25) is erected substantially perpendicular to the bottom plate portion 23a (25a). The

  On the other hand, the cross-sectional shape of the core wire 13 is rounded. Therefore, of the exposed portion QA, the distal end side portion Q3 (base end side portion Q1) located at the distal end side coupling portion 23 (intermediate coupling portion 25) of the terminal 20 and the distal end side coupling portion 23 (intermediate coupling portion 25). A gap is maintained between the two.

  Since the end portion 13a of the core wire 13 is also in contact with the bottom portion 22a of the wire connecting portion 22, dissimilar metal contact corrosion can also occur at this contact portion. Therefore, the adhesive 18 </ b> B in a fluid state enters the gap and is cured to form the adhesive 18. Further, the adhesive 18 </ b> B in a fluid state penetrates into the gaps between the strands constituting the core wire 13 and is cured to form the adhesive 18.

  The film (also referred to as “adhesive film”) 19 is adhered to the upper surface exposed portion QU of the exposed portion QA of the core wire 13 by the adhesive 18 so as to avoid the outer surface 20 c of the bottom portion 20 a of the terminal 20. Also by this, the exposed portion QA is subjected to anticorrosion treatment. The adhesive 18 preferably bonds the film 19 and the upper surface exposed portion QUI so that the film 19 has a shape along the upper surface exposed portion QU. The material of the film 19 is not limited to synthetic resin.

  In the example shown in FIGS. 1 to 3, as described above, the adhesive 18 is bonded to the bonding target region R1. The adhesion target region R1 includes at least the exposed portion QA. The film 19 is bonded to the portion corresponding to the upper surface exposed portion QU in the bonding target region R1 by the adhesive 18, and the pair of side wall portions 23b, the pair of core wire crimping pieces 24b in the bonding target region R1, The pair of side wall portions 25b, the pair of coated crimping pieces 26b, and the portions corresponding to the end portions of the coating 14 are also bonded. The region where the film 19 is bonded in the connection portion between the electric wire 12 and the terminal 20 is a coating target region R3.

  A part of the film 19 preferably protrudes from the tip portion of the core wire 13 to the side opposite to the coating 14. A portion of the adhesive 18 that covers the tip surface S <b> 1 of the core wire 13 is also bonded to the part of the film 19. Further, the part of the film 19 is preferably bent toward the tip end surface S1 side of the core wire 13.

<Manufacturing process of electric wire with terminal>
FIG. 5 is a flowchart showing a manufacturing process of the terminal-attached electric wire 10. As shown in FIG. 5, when the electric wire with terminal 10 is manufactured, first, an electric wire with terminal 10A (see FIGS. 6 and 7) in which the terminal 20 is connected to the end of the electric wire 12 is prepared (see FIG. 6). Step S10).

  Specifically, the electric wire 12 and the terminal 20 are prepared. And the edge part of the coating | cover 14 of the electric wire 12 is located between a pair of coating crimping pieces 26b in the coating crimping part 26 of the terminal 20, and the edge part 13a of the core wire 13 is a pair of core wire crimping piece 24b in the core wire crimping part 24. The electric wire 12 is arranged with respect to the terminal 20 so as to be positioned between the two. In this state, the coated crimping piece 26b of the coated crimping portion 26 is bent (clamped) toward the coating 14 side (inner side) on the bottom plate portion 26a, and the core wire crimping piece 24b of the core wire crimping portion 24 is the bottom plate portion 24a. It is bent (clamped) toward the upper end 13a side (inner side).

  Thereby, in the covering crimping portion 26, the bottom plate portion 26a and the two covering crimping pieces 26b are held in a state where they are crimped to the end portion of the covering 14, and in the core wire crimping portion 24, the bottom plate portion 24a and the two core wires are held. The crimping piece 24b is held in a state of being crimped to the end portion 13a. Thereby, the terminal-attached electric wire 10A that is not subjected to the anticorrosion treatment is manufactured. In the terminal-attached electric wire 10A, the front end side edge portion of the covering 14 is located at the position of the intermediate connecting portion 25, and a part thereof is exposed between the side wall portions 25b. Similarly, the distal end side edge portion of the end portion 13a of the core wire 13 is located at the position of the distal end side connecting portion 23, and a part thereof is exposed between the side wall portions 23b.

  The core wire 13 is a bundle of a plurality of strands, and the tip portion of the end portion 13 a of the core wire 13 protrudes from the core wire crimping portion 24 to the tip side of the terminal 20. When the core wire crimping portion 24 is crimped to the end portion 13a, each strand in the crimped portion is pressed toward the center of the core wire 13 by the core wire crimping portion 24, and adjacent strands are brought into close contact with each other. A reaction force acts on each of the adhered wires in a direction away from each other. The distal end portion of the core wire 13 is not restricted from spreading outward in the radial direction of the distal end portion. For this reason, each strand near the outer periphery of the tip portion of the core wire 13 is bent outward in the radial direction of the core wire 13. As a result, the diameter of the tip portion of the core wire 13, that is, the diameter of the wire bundle constituting the tip portion increases toward the tip surface S <b> 1 of the core wire 13. Among the strands constituting the tip surface S1, a large favorite gap is generated between the strands constituting the peripheral portion of the tip surface S1.

  Next, the adhesive 18B is applied to the terminal-attached electric wire 10A (step S20 in FIG. 5). More specifically, the fluidized adhesive 18 </ b> B is applied to the exposed portion QA so as to cover the exposed portion QA exposed from the terminal 20 in the end portion 13 a of the core wire 13. FIG. 6 (FIG. 7) is a schematic side view (schematic plan view) showing a state in which the adhesive 18B is applied so as to cover the application target region R2 including the exposed portion QA. For example, the adhesive 18B is sequentially supplied to the application target region R2 as a plurality of droplets by a dispenser or the like, spreads to the peripheral portion of the application target region R2, and forms an uncured anticorrosion coating in the application target region R2. The application target region R2 in FIG. 6 includes the adhesion target region R1 in FIG. 1 and is larger than the adhesion target region R1. Since the amount of the adhesive 18B applied to the outside of the adhesion target region R1 is reduced in step S40 described later, the film of the adhesive 18B applied to the range of the coating target region R3 and the coating target region R3. The thickness need not be set strictly. The application target region R2 may include at least a part of the bottom 20a (22a) of the terminal 20 (the electric wire connecting portion 22), but the application target region R2 preferably does not include the bottom 20a (22a).

  As the adhesive 18B, an adhesive that penetrates between the strands inside the electric wire 12 and is curable even in the penetrated place is adopted. As the adhesive 18B, for example, a moisture curable adhesive, an anaerobic curable adhesive, a two-component adhesive composed of a main agent and a curing agent, and the like are employed. As the moisture curable adhesive, for example, silicone or cyanoacrylate is employed. A silane coupling agent may be added to silicone as an additive. As the anaerobic curable adhesive, for example, organic peroxides such as hydroperoxides, ketone peroxides, diallyl peroxides, peroxyesters and the like are employed. A cationic curable adhesive mainly composed of epoxy or the like may be used as the adhesive 18B.

  After the application of the adhesive 18B is performed, the film 19 is placed on the applied adhesive 18B so as to cover the upper surface exposed portion QU of the exposed portion QA (step S30 in FIG. 5). FIG. 8 (FIG. 9) is a schematic side view (schematic plan view) showing a state in which the film 19 is placed on the adhesive 18 </ b> B so as to cover the adhesion target region including the upper surface exposed portion QU. The film 19 shown in FIG. 8 is shown by a cross section in a cut surface that passes through the center of the terminal 20 in the width direction and is perpendicular to the bottom portion 20a.

  Here, among the strands constituting the distal end surface S1 as described above, a particularly large gap is generated between the strands constituting the peripheral portion of the distal end surface S1. For this reason, when the viscosity of the adhesive 18B is low, the adhesive 18B hardly adheres to the tip surface S1, particularly the tip of each strand constituting the peripheral portion of the tip surface S1. For this reason, there is a possibility that the tip of each strand may be exposed without being covered with the adhesive 18B.

  On the other hand, when the viscosity of the adhesive 18B is high, the risk that the tip of each strand is exposed from the adhesive 18B at the tip surface S1 is reduced, but the film formed by the adhesive 18B is thick at the upper surface exposed portion QU. Therefore, the clearance between the manufactured terminal-attached electric wire 10 and the connector housing may be insufficient.

  Therefore, in order to prevent the film formed by the adhesive 18B in the upper surface exposed portion QU from becoming too thick and to prevent the tip of the strand from being exposed from the adhesive 18B in the tip surface S1 of the core wire 13, the applied adhesive is applied. The film 19 is placed on the agent 18B.

  In the manufactured electric wire 10 with a terminal, the cured adhesive 18 is bonded to the bonding target region R1 (FIGS. 1 and 2). In the terminal-attached electric wire 10, the film 19 is adhered by the adhesive 18 so as to substantially overlap the adhesive 18. More specifically, the film 19 is bonded to the coating target region R3 by the adhesive 18 in a state where the adhesive 18 is sandwiched between the coating target region R3 at the connection portion between the electric wire 12 and the terminal 20.

  The covering target region R3 includes a portion corresponding to the upper surface exposed portion QU in the bonding target region R1, a pair of side wall portions 23b, a pair of core wire crimping pieces 24b, a pair of side wall portions 25b, and a pair of coverings in the bonding target region R1. It consists of a crimping piece 26 b and a portion corresponding to the end of the coating 14. The covering target region R3 does not include the bottom portion 20a (22a) of the terminal 20 (the electric wire connecting portion 22).

  As shown in FIGS. 1 to 3, 12, and 13, the coating target region R <b> 3 includes at least the upper surface exposed portion QU of the exposed portion QA. In addition, the coating target region R3 may further include a distal end portion in the standing direction among the proximal end portions of the pair of side wall portions 23b in the length direction of the terminal 20. Further, the covering target region R3 preferably includes a pair of core wire crimping pieces 24b in a standing direction front end portion (a portion of the pair of core wire crimping pieces 24b excluding the vicinity of the bottom portion 22a) and a pair of intermediate connecting portions 25. The side wall 25b may include a front end portion in the standing direction (a part of the pair of side walls 25b excluding the vicinity of the bottom 22a). The covering target region R3 includes a front end side edge portion of the covering 14 and a front end side portion of the pair of covering crimping pieces 26b in the length direction of the terminal 20 (the bottom portion of the pair of covering crimping pieces 26b). 22a may be included).

  Since the film 19 is adhered to the coating target region R3 by the adhesive 18, the film 19 has a size overlapping with the coating target region R3. That is, the shape and size of the film 19 that can be formed in a state in which the upper surface exposed portion QU is adhered to the upper surface exposed portion QU of the exposed portion QA of the core wire 13 while avoiding the outer surface 20c of the bottom portion 20a of the terminal 20. have. In step S30, when the film 19 is placed on the applied adhesive 18B, the film 19 is disposed so as to be overlapped and adhered to the coating target region R3. The film 19 is prepared by, for example, an operator cutting a sheet-like film into the shape and size described above, and is placed on the adhesive 18B applied by the operator.

  The tip end portion of the core wire 13 protrudes from the core wire crimping piece 24 b of the terminal 20 to the side opposite to the coating 14. The film 19 is preferably placed on the adhesive 18 </ b> B so as to protrude from the tip portion of the core wire 13 to the side opposite to the coating 14.

  As the film 19, for example, a film manufactured from polyimide, polyolefin, polyvinylidene chloride, or the like is employed. In consideration of easy handling of the film 19 and prevention of insufficient clearance between the terminal-attached electric wire 10 and the connector housing, the thickness of the film 19 is preferably set in the range of 10 μm to 40 μm, for example. Is done.

  When the placement of the film is completed, the amount of the adhesive 18B existing between the exposed portion QA of the core wire 13 and the film 19, and the amount of the adhesive 18B attached to the outer side surface 20c of the bottom 20a of the terminal 20 A reduction process is performed to reduce (step S40 in FIG. 5). FIG. 10 (FIG. 11) is a schematic side view (schematic plan view) showing a state in which the reduction process is performed on the terminal-attached electric wire 10A on which the film 19 is placed. FIG. 12 (FIG. 13) is a schematic side view (schematic plan view) showing a state in which the terminal wire 10A shown in FIG. 10 and FIG. is there. The film 19 shown in FIGS. 10 and 12 is shown by a cross section in a cut surface that passes through the center of the terminal 20 in the width direction and is perpendicular to the bottom portion 20a. Moreover, in FIG. 12, the adhesive 18 is also shown by the cross section in the said cut surface.

  As shown in FIGS. 10 and 11, the reduction process is specifically performed using, for example, a suction device 70 connected to an evacuation facility (not shown) in a factory. The suction device (“decompression device”) 70 includes a cylindrical suction port having a larger diameter than the connection portion between the electric wire 12 and the terminal 20. The suction device 70 is provided on the side opposite to the exposed portion QA of the core wire 13 with respect to the bottom portion 20a so that the opening of the suction port faces the bottom portion 20a of the terminal 20.

  As shown in FIGS. 10 and 13, when the inside of the suction port of the suction device 70 is depressurized, an atmospheric airflow 99 is generated around the terminal-attached electric wire 10 </ b> A. The suction port sucks the atmosphere around the film 19 as an air flow 99. Thereby, both ends of the film 19 in the width direction of the terminal 20 are pulled toward the suction device 70 side. Then, the film 19 is pressed against the upper surface exposed portion QU of the core wire 13. As a result, the adhesive 18 </ b> B existing between the upper surface exposed portion QU and the film 19 is discharged from the both ends of the film 19 to the outside by the film 19 and sucked by the suction device 70. Thereby, the amount of the adhesive 18B is reduced, and the thickness of the film formed by the adhesive 18B is reduced. The adhesive 18B bonds the film 19 and the upper surface exposed portion QU so that the film 19 has a shape along the upper surface exposed portion QU of the core wire 13. Moreover, what is not covered with the film 19 among the adhesives 18B such as the adhesive 18B attached to the outer side surface 20c of the bottom 20a of the terminal 20 is also sucked by the suction device 70. The adhesive 18 </ b> B sucked by the suction device 70 is discharged to the outside by a drain pipe (not shown) connected to the bottom of the suction device 70.

  Since the core wire 13 is formed by bundling a plurality of strands, the cross-sectional shape of the end portion 13a is usually a substantially circular shape or a substantially oval shape, and the end portion 13a is the tip side connecting portion 23 (intermediate connecting portion 25). The pair of side wall portions 23b (25b) has a convex outer peripheral shape toward the front end side in the projecting direction. Therefore, if the exposed part between the pair of side wall parts 23b (25b) in the upper surface exposed part QU of the exposed part QA protrudes to the front end side in the projecting direction from the pair of side wall parts 23b (25b). The adhesive 18B existing between the upper surface exposed portion QU and the film 19 can be easily discharged, and the film 19 can easily have a shape along the upper surface exposed portion QU of the core wire 13.

  The reduction process of the adhesive 18B may be performed, for example, by blowing an airflow from the upper part of the film 19 to the film 19 and pressing the film 19 against the upper surface exposed portion QU. May be performed at the same time.

  After the amount of the adhesive 18B is reduced by the reduction process in step S40, the adhesive is in an uncured state. Therefore, an adhesive curing process is performed (step S50 in FIG. 5). For example, a curing treatment by leaving according to the curing method is performed. As a result, the adhesive 18B is cured to become the adhesive 18, and the terminal-attached electric wire 10 is manufactured.

  According to the terminal-attached electric wire according to the present embodiment configured as described above, the adhesive 18 that covers the exposed portion QA of the core wire 13 of the electric wire 12 while avoiding the outer surface of the bottom 20a of the terminal 20, and the adhesive 18 is provided with a film adhered to the upper surface exposed portion QU facing away from the bottom portion 20a of the terminal 20 among the exposed portions of the core wire while avoiding the outer surface of the bottom portion 20a. Therefore, adhesion of the adhesive 18B and the film 19 to the outer surface of the bottom 20a of the terminal 20 is suppressed, and the exposed portion QA of the core wire 13 is covered with the adhesive 18B. Further, since the upper surface exposed portion QU is covered with the film 19, the amount of the adhesive 18 sandwiched between the upper surface exposed portion QU and the film 19 can be reduced while suppressing the exposure of the upper surface exposed portion QU to the outside. . Thereby, the increase in the thickness of the electric wire with a terminal can be suppressed, preventing corrosion of the exposed portion QA of the core wire 13.

  In addition, according to the terminal-attached electric wire according to the present embodiment configured as described above, the adhesive 18 has the film 19 and the upper surface exposed portion so that the film 19 has a shape along the upper surface exposed portion QU of the core wire 13. QUI is bonded. Therefore, the amount of the adhesive 18 sandwiched between the upper surface exposed portion QU and the film 19 can be further reduced.

  In addition, according to the terminal-attached electric wire according to the present embodiment configured as described above, the tip end portion of the core wire 13 protrudes from the core wire crimping piece 24b of the terminal 20 to the side opposite to the coating 14, and the film 19 A part protrudes from the front end portion of the core wire 13 to the side opposite to the coating 14, and a portion of the adhesive 18 that covers the front end surface S <b> 1 of the core wire 13 is also bonded to the part of the film 19. Accordingly, since the adhesive 18B is in contact with both the film 19 and the front end surface S1 of the core wire 13 at the front end of the core wire 13, the adhesive 18B is stably held and adhered to the front end surface S1 of the core wire 13. Can be suppressed. Thereby, the anticorrosion effect of the front-end | tip of the core wire 13 can be improved.

  Moreover, according to the electric wire with a terminal according to the present embodiment configured as described above, a part of the film 19 protrudes from the tip portion of the core wire 13 to the side opposite to the coating 14. The part of the film 19 is bent toward the front end surface S1 side of the core wire 13. Accordingly, since the adhesive 18 is sandwiched between both the bent portion of the film 19 and the tip surface S1 of the core wire 13 at the tip of the core wire 13, the adhesive 18 is held more stably. A decrease in the adhesive adhering to S1 can be further suppressed. Thereby, the anticorrosion effect of the front-end | tip of the core wire 13 can further be improved.

  Moreover, according to the manufacturing method of the electric wire with a terminal concerning this embodiment as mentioned above, the adhesive 18B is apply | coated to the exposed part QA so that the exposed part QA of the core wire 13 may be covered, and the outer surface of the bottom part 20a of the terminal 20 The film 19 having a size that can be adhered to the upper surface exposed portion QU so as to cover the upper surface exposed portion QU facing away from the bottom portion 20a of the exposed portion QA of the core wire 13 is formed on the adhesive 18B. Is placed in an arrangement capable of bonding. Then, the amount of the adhesive 18B existing between the upper surface exposed portion QU of the core wire 13 and the film 19 and the amount of the adhesive 18B adhering to the outer surface 20c of the bottom portion 20a of the terminal 20 are reduced. Therefore, adhesion of the adhesive 18B and the film 19 to the outer surface of the bottom 20a of the terminal 20 is suppressed, and the exposed portion QA of the core wire 13 is covered with the adhesive 18B. Further, the film thickness of the adhesive 18B sandwiched between the upper surface exposed portion QU and the film 19 can be suppressed. Thereby, the increase in the thickness of the electric wire with a terminal can be suppressed, preventing corrosion of the exposed part QA of the core wire 13 of the electric wire with a terminal to be manufactured.

  Moreover, according to the manufacturing method of the electric wire with a terminal concerning this embodiment as mentioned above, the front-end | tip part of the core wire 13 has protruded on the opposite side to the coating | cover 14, and a part of film 19 has the front-end | tip part of the core wire 13 Is placed on the adhesive 18B so as to protrude from the side opposite to the coating 14. Accordingly, since the adhesive 18B is in contact with both the part of the film 19 and the tip surface S1 of the core wire 13 at the tip of the core wire 13, it is stably held and adheres to the tip surface S1 of the core wire 13. It is possible to suppress the decrease in the adhesive. Thereby, the anticorrosion effect of the front-end | tip of the core wire 13 can be improved.

  Moreover, according to the manufacturing method of the electric wire with a terminal which concerns on the above this embodiment, the atmosphere around the film 19 is attracted | sucked from the opposite side to the exposed part QA of the core wire 13 with respect to the bottom part 20a of the terminal 20. Thus, the amount of the adhesive 18B existing between the upper surface exposed part QU and the film 19 is reduced by pressing the film 19 against the upper surface exposed part QU of the core wire 13. Therefore, the film thickness of the adhesive 18B between the exposed portion QA of the core wire 13 and the film 19 can be reduced more efficiently.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

10, 10A Electric wire with terminal 12 Electric wire 13 Core wire 13a End portion 14 Insulation (insulation coating)
20 terminal 20a bottom 24 core wire crimping part 24b core wire crimping piece 18, 18B adhesive QA exposed part QU upper surface exposed part 19 film (adhesive film)
70 Suction device

Claims (7)

An electric wire including a core wire and an insulating coating that covers an outer periphery of the core wire while avoiding an end of the core wire;
A terminal including a bottom part and a core wire crimping piece protruding from a part of the bottom part, wherein the core wire crimping part is crimped to the end of the core wire;
An adhesive covering an exposed portion of the end portion of the core wire while avoiding an outer surface of the bottom portion of the terminal; and
Adhesion bonded to the upper surface exposed portion by avoiding the outer surface of the bottom portion of the terminal by the adhesive covering the upper surface exposed portion facing away from the bottom portion of the exposed portion of the core wire. A membrane,
An electric wire with a terminal. It is an electric wire with a terminal according to claim 1,
The adhesive covering the upper surface exposed portion of the core wire,
The electric wire with a terminal, wherein the adhesive film and the upper surface exposed portion are bonded so that the adhesive film has a shape along the upper surface exposed portion of the core wire. It is an electric wire with a terminal according to claim 1 or 2,
The tip portion of the core wire protrudes from the core wire crimping piece of the terminal to the side opposite to the insulating coating,
A part of the adhesive film protrudes from the tip portion of the core wire to the side opposite to the insulating coating,
The electric wire with a terminal, wherein the adhesive covering the tip surface of the core wire in the exposed portion of the core wire is also bonded to the part of the adhesive film. It is an electric wire with a terminal according to claim 3,
A part of the adhesive film protrudes from the tip portion of the core wire to the side opposite to the insulating coating,
The electric wire with a terminal, wherein the part of the adhesive film is bent toward the distal end side of the core wire. The core wire crimping piece protruding from a part of the bottom of the terminal is crimped to the end portion exposed from the insulating coating of the core wire of the electric wire, and the exposed portion of the end portion of the core wire is subjected to anticorrosion treatment. A method of manufacturing a wire with a terminal,
An adhesive application step of applying an adhesive to the exposed portion so as to cover the exposed portion of the core wire;
An adhesive film of a size that can be adhered to the upper surface exposed portion so as to cover the upper surface exposed portion facing away from the bottom portion of the exposed portion of the core wire while avoiding the outer surface of the bottom portion of the terminal An adhesive film placing step of placing the adhesive on the adhesive applied so as to cover the exposed portion of the core wire in an arrangement capable of adhesion;
An adhesive reduction step of reducing the amount of the adhesive existing between the exposed upper surface portion of the core wire and the adhesive film and the amount of the adhesive adhering to the outer surface of the bottom portion of the terminal. When,
The manufacturing method of the electric wire with a terminal provided with. It is a manufacturing method of the electric wire with a terminal according to claim 5,
The tip portion of the core wire protrudes from the core wire crimping piece of the terminal to the side opposite to the insulating coating,
The adhesive film placing step includes
The adhesive film is placed on the adhesive applied so as to cover the exposed portion of the core wire so that a part of the adhesive film protrudes from the tip portion of the core wire to the side opposite to the insulating coating. The manufacturing method of the electric wire with a terminal which is a process. It is a manufacturing method of the electric wire with a terminal according to claim 5 or claim 6,
The adhesive reducing step
The upper surface exposed portion is formed by sucking an atmosphere around the adhesive film from the opposite side of the exposed portion of the core wire to the bottom portion of the terminal and pressing the adhesive film against the upper surface exposed portion of the core wire. The manufacturing method of the electric wire with a terminal including the process of reducing the quantity of the said adhesive agent which exists between the said adhesive films.

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