JP2012238402A - Wire with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent corrosion of the core wire of a wire with a terminal, by sealing a portion of the core wire at the end of the wire while preventing the end, where a crimp terminal is provided, from becoming excessively thick.SOLUTION: In the wire 1 with a terminal, an anticorrosive agent 8 covers the tip 91A of a bare core wire 91 in a wire 9. Furthermore, in a state where a shrinkage force acts due to elasticity on an elastic tube 7 consisting of an elastic body, a protective area from a portion where a coated crimp part 20 is crimped at the end of the wire 9 to a part covered with the anticorrosive agent 8 is covered from the outside of a crimp terminal 10 and the anticorrosive agent 8.

Description

  The present invention relates to an electric wire with a terminal including an electric wire and a crimp terminal attached to an end portion of the electric wire.

  Generally, a metal crimp terminal is attached to an end portion of an electric wire in a wire harness. As shown in Patent Document 1, a crimp terminal often has a coated crimp portion, a core wire crimp portion, and a terminal connection portion. 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 terminal connecting portion is a portion connected to the mating terminal by fitting with the mating terminal.

  Then, a part of each of the coated crimping portion and the core wire crimping portion is bent and caulked against the insulating coating and the core wire, so that the coated crimping portion grips the insulation coating of the electric wire, and the core wire crimping portion removes the core wire of the electric wire. Hold it. As a result, the crimp terminal is fixed to the end of the electric wire. Hereinafter, an electric wire having a crimp terminal attached to the end portion is referred to as a terminal-attached electric wire.

  In the crimp terminal, the coated crimp portion plays a role of firmly holding the crimp terminal on the electric wire, and the core wire crimp portion mainly plays a role of electrically connecting the crimp terminal and the core wire of the wire. Note that the coated crimping portion, the core crimping portion, and the terminal connection portion are referred to as an insulation barrel, a wire barrel, and a contact, respectively. Generally, the crimp terminal is made of copper or a copper alloy.

  By the way, in the electric wire with a terminal, when the core wire of the electric wire is an aluminum wire, the aluminum wire which comes into contact with the crimp terminal made of copper or a copper alloy is easily corroded by different metal contact corrosion. In order to prevent contact corrosion of dissimilar metals in electric wires with terminals, it is effective to prevent moisture from entering the parts where dissimilar metals are in contact, that is, the parts where the core wire of the wire and the core wire crimping part of the crimp terminal are in contact. It is.

  In order to prevent dissimilar metal contact corrosion, the electric wire with terminal shown in Patent Document 1 includes a heat shrinkable tube with a thermoplastic adhesive, which is a heat shrinkable tube having a thermoplastic adhesive formed on the inner surface. In the electric wire with a terminal shown in Patent Literature 1, the heat shrinkable tube with a thermoplastic backing agent covers a region from the outer side of the electric wire and the crimp terminal to the end portion of the core wire from the portion where the insulation barrel of the electric wire is crimped.

JP 2011-29102 A

  However, the electric wire with terminal shown in Patent Document 1 has the following problems. The first problem is that a gap is easily generated between the tip of the core wire of the electric wire and the heat shrinkable tube with the thermoplastic adhesive. That is, the thermoplastic adhesive in the heat-shrinkable tube is melted by heating and flows out to the front end portion of the core wire, but it is difficult to reach the entire front end portion of the core wire and cover the entire front end portion of the core wire. If a gap is generated between the tip of the core wire and the heat shrinkable tube, a sufficient anticorrosion effect cannot be obtained.

  The second problem is that if the amount of the thermoplastic adhesive in the heat-shrinkable tube is increased so that no gap is formed between the tip of the core wire and the heat-shrinkable tube, The part is too thick. In general, if the end portion of the terminal-attached electric wire is too thick, it cannot be inserted into a mounting hole formed in a connector or the like, so that the thickness is limited.

  An object of the present invention is to seal a core wire portion at an end portion of an electric wire and prevent corrosion of the core wire while preventing an end portion where a crimp terminal is provided from becoming excessively thick in a terminal-attached electric wire.

The electric wire with a terminal concerning the present invention is provided with each component shown below.
(1) The first component is an electric wire.
(2) The second component includes a coated crimped portion crimped to the insulating coating at the end of the electric wire, a core crimped portion crimped to the core wire extending from the insulating coating at the end of the electric wire, and a counterpart terminal A crimp terminal having a terminal connection portion to be connected.
(3) A 3rd component is the 1st anticorrosive which covers the front-end | tip part of a core wire.
(4) The fourth component is a cylindrical member made of an elastic body, and the first anticorrosive agent from the portion where the covering crimping portion at the end of the electric wire is crimped in a state where the contraction force acts by elasticity. It is an elastic tube which covers the protection area covering the part covered with the outer side of the crimp terminal and the first anticorrosive and is in close contact with the protection area.

It is also conceivable that the terminal-attached electric wire according to the present invention further includes the following constituent elements.
(5) A 5th component is the 2nd anticorrosive which covers the core wire between the part by which the covering crimping part of the crimp terminal in the electric wire was crimped, and the part by which the core wire crimping part was crimped.

  Moreover, in the electric wire with a terminal which concerns on this invention, it is possible that the core wire and crimp terminal of an electric wire are comprised with the metal material of a different kind. More specifically, it is conceivable that the core wire of the electric wire is a metal wire whose main component is aluminum.

  In the terminal-attached electric wire according to the present invention, the anticorrosive agent covers the tip of the core wire at the end of the wire and fills the gap between the tip of the core and the elastic tube. Furthermore, the elastic tube in a state in which the contraction force acts by elasticity is a region (protective region) extending from the portion where the covering crimping portion at the end of the electric wire is crimped, that is, from the insulating coating portion to the portion covered with the anticorrosive agent. And close to the area. Therefore, the portion of the core wire at the end portion of the electric wire is sealed with the anticorrosive agent and the elastic tube, and the corrosion of the core wire is prevented. Further, it is not necessary to form a large amount of thermoplastic adhesive inside the elastic tube, and the end portion of the electric wire on which the crimp terminal is provided does not become excessively thick. Furthermore, unlike the heat-shrinkable tube, the elastic tube does not need to be heated, so that it can be easily attached to the electric wire.

  Moreover, in the electric wire with a terminal according to the present invention, if the portion of the core wire between the portion where the coated crimp portion of the crimp terminal of the electric wire is crimped and the portion where the core crimp portion is crimped is covered with an anticorrosive agent. It is preferable. Thereby, even if moisture enters the inside of the elastic tube, the moisture is prevented from reaching the core wire. Thereby, the anticorrosion effect of a core wire increases more.

  Moreover, the electric wire with a terminal according to the present invention has a case where the core wire of the electric wire and the crimp terminal are made of different kinds of metal materials, that is, when a higher waterproof structure is required to prevent contact corrosion of different metals. Especially effective. More specifically, when the core wire of the electric wire is a metal wire whose main component is aluminum, the anticorrosion effect of the electric wire with terminal according to the present invention is particularly remarkable.

It is a perspective view of electric wire 1 with a terminal concerning an embodiment of the present invention. It is a longitudinal cross-sectional view of the edge part of the electric wire 1 with a terminal. It is a perspective view of the 1st state of the edge part of the electric wire in the manufacture process of the electric wire 1 with a terminal. It is a perspective view of the 2nd state of the edge part of the electric wire in the manufacture process of the electric wire 1 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.

<Embodiment>
First, the structure of the terminal-attached electric wire 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. The terminal-attached electric wire 1 includes an electric wire 9, a crimp terminal 10 attached to an end portion thereof, an anticorrosive agent 8 formed on the end portion of the electric wire 9, and an elastic tube 7 covering the end portion of the electric wire 9. FIG. 2 is a cross-sectional view of the end portion of the terminal-attached electric wire 1 along the longitudinal center line of the electric wire 9 and the crimp terminal 10.

  Hereinafter, a direction from the center of the electric wire 9 toward the front end is referred to as an extending direction. That is, the extending direction is the longitudinal direction of the electric wire 9. The crimp terminal 10 and the elastic tube 7 are attached to the end portion of the electric wire 9 such that the longitudinal direction thereof is along the extending direction. The positive direction of the X axis in the coordinate axes shown in each figure is the stretching direction. Moreover, the broken line in FIG.1, FIG3 and FIG.4 is a hidden line. The term “near the center of the electric wire 9” means that the electric wire 9 is closer to the opposite side than the distal end side (terminal side).

<Wire>
The electric wire 9 to which the crimp terminal 10 is attached is an insulated wire having a core wire that is a long conductor and an insulating coating that is an insulator covering the periphery of the core wire. The end of the electric wire 9 to which the crimp terminal 10 is attached is in a state in which the insulation coating has been peeled off from the periphery of the core wire of a certain length in advance, that is, in a state where the core wire of a certain length has been extended from the insulation coating. Has been processed.

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

  In the terminal-attached electric wire 1, the core wire of the electric wire 9 is made of a metal material that is different from the metal material constituting the crimp terminal 10. The core wire of the electric wire 9 is, for example, a metal wire material mainly composed of aluminum.

<Crimp terminal>
As shown in FIG. 1 and FIG. 2, the crimp terminal 10 is formed in a line along the extending direction. The crimped crimp part 20, the first connecting part 30, the core crimping part 40, and the second connecting part 50. And a terminal connection portion 60.

  The crimp terminal 10 is made of a copper alloy such as copper or brass, or a tin alloy in which tin (Sn) plating or tin (Ag), copper (Cu), bismuth (Bi) or the like is added to these members. It is a conductor member plated.

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

  More specifically, the covering crimping portion 20 is formed to stand on the both sides of the bottom plate portion that supports the covering end portion 92 from one direction and from the bottom plate portion to the covering end portion 92. And an upright portion that is caulked. The Y-axis direction of the coordinate axes shown in each figure is a direction (width direction) in which a pair of upright portions oppose each other. Moreover, the Z-axis direction of the coordinate axes shown in each figure is a direction (height direction) orthogonal to the stretching direction and the width direction.

<Crimp terminal: Core wire crimping part>
The core wire crimping portion 40 is a plate-like portion formed by bending, and forms a groove into which the bare core wire 91 of the electric wire 9 is inserted before being crimped to the electric wire 9. The core wire crimping portion 40 is crimped to the bare core wire 91 by being caulked against the bare core wire 91 inserted inside the groove formed by the core wire crimping portion 40.

  More specifically, the core wire crimping portion 40 is a stand plate portion that supports the bare core wire 91 from one direction, and is erected from the bottom plate portion to both sides of the bare core wire 91 and is caulked against the bare core wire 91. Part. The pair of standing portions in the core wire crimping portion 40 are also formed to face each other in the width direction.

<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 covered end portion 92 and the bare core wire 91 is inserted.

<Crimp terminal: Second connection part>
The second connecting portion 50 is a portion that connects the core wire crimping portion 40 and the terminal connecting portion 60. The 2nd connection part 50 is the plate-shaped part formed by bending, and forms the groove | channel. The tip 91A of the bare core 91 may protrude from the core crimping part 40 into the groove formed by the second connecting part 50, but it may not be. In addition, the example shown by each figure is an example which the front-end | tip part 91A of the bare core wire 91 protrudes slightly from the core wire crimping part 40 to the 2nd connection part 50 side.

<Crimp terminal: Terminal connection>
The terminal connecting portion 60 is a portion that is directly connected to the mating terminal and connected to the mating terminal by fitting with a mating terminal (not shown) that is the mating terminal of the crimp terminal 10. The terminal connection part 60 shown by FIG. 1 is a cylindrical part in which the terminal insertion hole 61 which is a hole by which the other party terminal is inserted is formed. In addition, the terminal connection part 60 may be a rod-shaped conductor inserted in the terminal insertion hole of the counterpart terminal.

<Anti-corrosion structure>
In the terminal-attached electric wire 1, the core wire (bare core wire 91) of the electric wire 9 and the crimp terminal 10 are made of different metals. Specifically, the core wire is an aluminum wire, that is, a wire made of a metal (aluminum or aluminum alloy) containing aluminum as a main component. On the other hand, the crimp terminal 10 is a copper alloy member such as copper or brass, or tin (Sn) plating or tin added with silver (Ag), copper (Cu), bismuth (Bi) or the like. A member plated with an alloy. Therefore, the bare core wire 91 that comes into contact with the crimp terminal 10 is easily corroded by different metal contact corrosion.

  Therefore, an anticorrosion structure is provided at the end of the electric wire 9 in the terminal-equipped electric wire 1 to prevent corrosion of the bare core wire 91 by preventing intrusion of moisture and the like. The anticorrosion structure in the terminal-attached electric wire 1 includes an anticorrosive 8 and an elastic tube 7.

<Anti-corrosion structure: anti-corrosion agent>
The anticorrosive 8 is applied so as to cover the distal end portion 91 </ b> A of the bare core wire 91 at a portion straddling the core wire crimping portion 40 and the second connecting portion 50 in the crimp terminal 10. The anticorrosive 8 prevents moisture from entering the tip 91 </ b> A of the bare core 91 by sealing the tip 91 </ b> A of the bare core 91. The anticorrosive 8 can be, for example, a silicon-based, acrylic-based, urethane-based, polyamide-based, or epoxy-based resin.

  The anticorrosive 8 may be composed of a material obtained by curing a thermosetting resin such as an epoxy resin, a phenol resin, a melamine resin, or polyurethane by heating. It is also conceivable that the anticorrosive 8 is composed of a material obtained by curing a photocurable resin by exposure with light having a specific wavelength.

<Anti-corrosion structure: elastic tube>
The elastic tube 7 is a cylindrical member made of an elastic material, for example, a member made of rubber or an elastomer (elastic polymer) that is a rubber-based material. The elastomer includes vulcanized rubbers such as natural rubber and synthetic rubber, and thermosetting resin-based elastomers such as urethane rubber, silicone rubber and fluorine rubber.

  The elastic tube 7 covers a predetermined protective region at the end of the electric wire 9 from the outside of the crimp terminal 10 and the anticorrosive 8. The protection region is a region in the end portion of the electric wire 9 that extends from the portion where the coated crimp portion 20 is crimped to the portion covered with the anticorrosive agent 8. In the present embodiment, the protection region also includes a base portion 92A closer to the center than the portion where the covering crimping portion 20 is crimped. The root portion 92A is a part of the covering end portion 92.

  The inner diameter of the elastic tube 7 in the natural state is smaller than the minimum outer diameter of the end portion of the electric wire 9 and the crimp terminal 10 crimped to the end portion. However, the elastic tube 7 is elastically deformed by applying a force from the inside to the outside, and is expanded until the inner diameter becomes larger than the maximum outer diameter of the end portion of the electric wire 9 and the crimp terminal 10 crimped to the end portion. To do. Therefore, the elastic tube 7 covers the protection region of the electric wire 9 and is in close contact with the protection region in a state where the contraction force acts due to elasticity when the protection region of the electric wire 9 is passed through the elastic tube 7.

  More specifically, the elastic tube 7 is in close contact with at least the root portion 92 </ b> A of the covering end 92, the covering crimping portion 20, the core crimping portion 40, and the anticorrosive 8 in the protection region of the electric wire 9. Since the elastic tube 7 is made of an elastic material such as rubber having a large friction coefficient, the elastic tube 7 is difficult to slip with respect to the electric wire 9 and the crimp terminal 10. Therefore, the displacement of the elastic tube 7 with respect to the electric wire hardly occurs.

  Note that the elastic tube 7 shown in the present embodiment is a cylindrical member. However, the elastic tube 7 may be a cylindrical member that is not a cylinder, such as a rectangular tube, depending on the outer shape of the electric wire 9, the cover crimping portion 20, and the core wire crimping portion 40.

<Procedure for manufacturing electric wires with terminals>
Next, an example of a manufacturing procedure of the terminal-attached electric wire 1 will be described with reference to FIGS. 3 and 4. FIG.3 and FIG.4 is a perspective view of the 1st state of the edge part of an electric wire in the manufacture process of the electric wire 1 with a terminal, and a 2nd state, respectively.

  FIG. 3 is a perspective view of the electric wire 9 and the crimp terminal 10 before the application of the anticorrosive 8 and the attachment of the elastic tube 7 after the crimp terminal 10 is attached to the end of the electric wire 9. 4 is a perspective view of the electric wire 9 and the crimp terminal 10 before the elastic tube 7 is attached after the anticorrosive 8 is applied to the tip 91A of the bare core wire 91 in the electric wire 9. FIG. In addition, in FIG. 4, the elastic tube 7 in the natural state before the edge part of the electric wire 9 is passed is shown with the virtual line (two-dot chain line).

  In the manufacturing process of the terminal-attached electric wire 1, first, the crimp terminal 10 is crimped to the end of the electric wire 9.

  Next, as shown in FIG. 4, the anticorrosive 8 is applied to the distal end portion 91 </ b> A of the bare core wire 91 to which the core wire crimping portion 40 is crimped so as to cover the distal end portion 91 </ b> A. The anticorrosive 8 is a liquid having a relatively high viscosity when applied to the tip 91A of the bare core wire 91, and solidifies in a state of covering the tip 91A of the bare core 91 by receiving some action.

  For example, when the anticorrosive agent 8 is a thermosetting resin, the anticorrosive agent 8 applied to the end portion 91A of the bare core wire 91 is solidified by being heated. When the anticorrosive agent 8 is a photocurable resin, the anticorrosive agent 8 applied to the tip 91A of the bare core wire 91 is solidified by being exposed to light of a specific wavelength.

  After the anticorrosive agent 8 covering the distal end portion 91 </ b> A of the bare core wire 91 is solidified, the protection region at the end portion of the electric wire 9 is passed inside the elastic tube 7. As shown by the phantom line in FIG. 4, the elastic tube 7 in a natural state where no force is applied is smaller than the end portion of the electric wire 9 and the minimum outer diameter of the crimp terminal 10. However, the elastic tube 7 is elastically deformed by applying a force from the inside to the outside by a jig (not shown), and the inner diameter of the elastic tube 7 is the maximum outer diameter of the end portion of the electric wire 9 and the crimp terminal 10 that is crimped to the end portion. Expand until it becomes larger. As shown in FIG. 4, the end of the electric wire 9 is passed inside the elastic tube 7 expanded.

  And the jig | tool is removed from the inner side of the elastic tube 7 in the state which the protection area | region of the electric wire 9 is located inside the expanded elastic tube 7. FIG. Thereby, the elastic tube 7 is in a state where the contraction force acts due to elasticity, and the protective region at the end of the electric wire 9 is formed from the portion extending from the coated crimping portion 20 to the core crimping portion 40 in the crimp terminal 10 and from the outside of the anticorrosive 8. Cover and close to the protected area.

<Effect>
In the terminal-attached electric wire 1, the anticorrosive 8 covers the tip 91 </ b> A of the bare core 91 and fills the gap between the tip 91 </ b> A of the bare core 91 and the elastic tube 7. Further, the contracted elastic tube 7 covers the protection region from the base portion 92A closer to the center to the portion covered with the anticorrosive 8 than the portion where the covering crimping portion 20 is crimped on the covering end portion 92. Therefore, the bare core wire 91 at the end of the electric wire 9 is sealed by the anticorrosive 8 and the elastic tube 7, and corrosion of the bare core wire 91 is prevented. Further, it is not necessary to form a large amount of thermoplastic adhesive inside the elastic tube 7, and the end portion of the electric wire 9 on which the crimp terminal 10 is provided does not become excessively thick.

  In the case of the electric wire with terminal 1, when the core wire of the electric wire 9 and the crimping terminal 10 are made of different kinds of metal materials, that is, when a higher waterproof structure is required to prevent contact corrosion of different metals. It is particularly effective. More specifically, when the core wire of the electric wire 9 is a metal wire whose main component is aluminum, the anticorrosion effect of the electric wire with terminal 1 is particularly remarkable.

  In addition, unlike the heat-shrinkable tube, the elastic tube 7 does not need to be heated and thus can be easily attached to the electric wire 9.

<Others>
In the embodiment shown above, the anticorrosive 8 is provided only at the tip 91 </ b> A of the bare core wire 91. However, it is also conceivable that the anticorrosive 8 is applied to the bare core wire 91 between the portion of the electric wire 9 where the coated crimp portion 20 is crimped and the portion where the core wire crimp portion 40 is crimped. In this case, the first anticorrosive 8 covers the distal end portion 91 </ b> A of the bare core wire 91. The second anticorrosive 8 covers the portion of the bare core wire 91 between the portion of the electric wire 9 where the coated crimping portion 20 is crimped and the portion where the core wire crimping portion 40 is crimped.

  By forming the second anticorrosive agent 8 in addition to the first anticorrosive agent 8, even if water enters the inside of the elastic tube 7, it is prevented that the water reaches the bare core 91. It is. Thereby, the anticorrosion effect of the bare core wire 91 increases more.

  Moreover, in the electric wire 1 with a terminal, it is also considered that the adhesive tape is wound around the covering end portion 92 of the electric wire 9 and the end portion on the base portion 92A side of the elastic tube 7 so as to straddle them. Thereby, while the sealing performance of the edge part of the electric wire 9 by the elastic tube 7 improves more, the position shift of the elastic tube 7 with respect to the electric wire 9 is prevented more reliably.

DESCRIPTION OF SYMBOLS 1 Electric wire with a terminal 7 Elastic tube 8 Anticorrosive agent 9 Electric wire 10 Crimp terminal 20 Coating | bonding crimp part 30 1st connection part 40 Core wire crimping part 50 2nd connection part 60 Terminal connection part 61 Terminal insertion hole 91 Bare core wire (core wire)
91A Bare core wire tip 92 Covered end (insulation coating)
92A Root part of covering end

Claims (4)

Electric wires,
A sheath crimping portion crimped to an insulating coating at an end of the electric wire, a core crimping portion crimped to a core wire extending from the insulating coating at an end of the electric wire, and a terminal connection portion connected to a counterpart terminal A crimped terminal, and a terminal-attached electric wire comprising:
A first anticorrosive covering the tip of the core wire;
It is a cylindrical member made of an elastic body, and in a state where contraction force acts due to elasticity, it extends from a portion where the covering crimping portion at the end of the electric wire is crimped to a portion covered with the first anticorrosive agent. An electric wire with a terminal, comprising: an elastic tube that covers a protective region from outside the crimp terminal and the first anticorrosive agent and is in close contact with the protective region.   The terminal according to claim 1, further comprising a second anticorrosive agent that covers the core wire between a portion where the covering crimp portion of the crimp terminal of the electric wire is crimped and a portion where the core crimp portion is crimped. Attached wire.   The electric wire with a terminal according to claim 1 or 2, wherein the core wire of the electric wire and the crimp terminal are made of different kinds of metal materials.   The electric wire with a terminal according to claim 3, wherein the core wire of the electric wire is a metal wire mainly composed of aluminum.

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