JP2012059595A - Electric wire with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric wire with terminal which allows easy confirmation of that a predetermined area on an outer face of a terminal, requiring minimum application of an anticorrosive agent thereto, is thoroughly covered with the anticorrosive agent, and which is excellent in corrosion resistance.SOLUTION: An electric wire with terminal 1 is formed by crimping a wire 10 at a wire crimping portion 111 of a terminal 20. A border line 8a is provided on outer faces of a sidewall portion 7a and a crimping pawl 64a of the wire crimping portion 111, and a border line 8b is provided on outer faces of a sidewall portion 7b and a crimping pawl 64b of the wire crimping portion 111. The border lines 8a, 8b define an anticorrosive area 800 where an anticorrosive agent 99 must be minimally applied to. The anticorrosive agent 99 contains thermoplastic polyamide resin as a main component, and has: a tensile shear strength of 6 N/mmor higher when one aluminum is laid on another, measured in accordance with JIS K6850; an elongation percentage of 100% or greater measured in accordance with ASTM D-1708; and a water absorption rate of 1.0% or lower measured in accordance with JIS K7209.

Description

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

  In general, when a terminal-attached electric wire is manufactured, first, the covering of the tip end portion of the covered electric wire is peeled off to expose a core wire composed of a plurality of strands that are conductors. And the electric wire with a terminal is obtained by crimping the crimp terminal which consists of materials, such as copper, to the exposed core wire.

  When such a terminal-attached electric wire is left as it is with the crimp terminal crimped to the core wire, moisture such as salt water adheres to the contact portion between the core wire and the crimp terminal, which is caused by capillary action. There is a risk of moisture entering the inside of the covered wire. Patent Document 1 discloses a technique for preventing moisture from entering the inside of a covered electric wire. Specifically, there is a molding die composed of an upper die and a lower die, and a molding cavity mold portion is provided on the internal mating surfaces of these upper and lower dies. When the molten mold resin is injected and injected into the mold portion, the core wire crimped by the terminals is covered with the mold resin and protected from moisture.

Japanese Patent No. 3776657

  Conventionally, copper or copper alloy has been used for the core wire of such a terminal-attached electric wire, but in recent years, in order to reduce the weight of the electric wire with a terminal, the development of an electric wire with a terminal using aluminum as the core wire has been developed. It is being advanced. However, in the case of an electric wire with a terminal in which copper is used for the terminal and aluminum is used for the core wire, if an aqueous electrolyte solution such as salt water adheres to the contact portion between the terminal and the core wire, the core wire is corroded by an electrochemical reaction. . Specifically, since the terminal and the core wire are dissimilar metals, a difference occurs in the standard electrode potential, and corrosion occurs in a metal having a small standard electrode potential, in this case, aluminum. The technique of Patent Document 1 is only related to waterproofing and cannot prevent corrosion. Therefore, in order to prevent corrosion, it is necessary to attach the anticorrosive agent excellent in anticorrosion performance to the contact part of a terminal and a core wire.

  At this time, the anticorrosive agent needs to be adhered to a certain range not only on the contact portion between the terminal and the core wire but also on the outer surface of the terminal. This is because the aqueous electrolyte solution may enter from the outside of the terminal toward the inside of the terminal. When the aqueous electrolyte solution enters the inside of the terminal, the aqueous electrolyte solution may adhere to the contact portion between the core wire inside the terminal and the terminal.

  As a technique for attaching the anticorrosive to the terminal, spraying, dripping, dipping, and the like are considered. Regardless of which technique is used, since the terminal is small, the adhesion range of the anticorrosive agent on the outer surface of the terminal cannot be made constant every time. Generally, the adhesion range of the anticorrosive agent on the terminal can be made constant by using the above technique after the terminal is masked. However, since the terminal is small and has a three-dimensional structure, it is difficult to perform a masking process on a certain range of the terminal every time.

  Therefore, after attaching the anticorrosive agent to the terminal, confirm that the anticorrosive agent is properly attached to the outside surface of the terminal within the range where the anticorrosive agent needs to be attached at least to prevent the electrolyte aqueous solution from entering. There is a need to. However, it is difficult to distinguish a range where such an anticorrosive agent needs to be adhered from other regions in the terminal. For this reason, it is very difficult to confirm whether the anticorrosive completely covers the range where the anticorrosive on the outer surface of the terminal needs to be attached to the minimum.

  The present invention has been made in view of the above problems, and it is easy to confirm that a certain range on the outer surface of the terminal, to which an anticorrosive agent is required to be attached at a minimum, is completely covered with the anticorrosive agent. An object of the present invention is to provide a terminal-attached electric wire that can be made and has excellent corrosion resistance.

In order to solve the above-described problems, an electric wire with a terminal according to the present invention includes an electric wire, a wire crimping portion that holds an end portion of the electric wire, and a terminal integrally formed with a terminal fitting portion connected to a mating terminal. The wire crimping portion of the terminal includes two side wall portions facing from both sides sandwiching an end portion of the electric wire, a bottom portion connecting the two side wall portions, and the two side wall portions. A first crimping portion extending from each of the portions and crimped to a covering portion at an end of the electric wire; and a second crimping portion formed from each of the two side wall portions and crimped to a core wire extending from the covering portion. A position on the terminal fitting portion side from the first crimping portion to the second crimping portion on the outer surface of the first crimping portion and the two side wall portions in the wire crimping portion. The second crimping part and the core wire part over the range up to A boundary line that specifies a predetermined determination region that surrounds in three directions is written, and an anticorrosive that covers the second crimping portion and the core wire is applied over at least the region including the determination region that is specified by the boundary line. The anticorrosive has a thermoplastic polyamide resin as a main component, and an aluminum-to-aluminum tensile tensile shear strength measured in accordance with JIS K6850 is 6 N / mm ² or more, measured in accordance with ASTM D-1708. The elongation percentage is 100% or more and the water absorption measured in accordance with JIS K7209 is 1.0% or less.

  Here, the thermoplastic polyamide resin is preferably composed of a combination of dimer acid and / or dicarboxylic acid and diamine.

  Moreover, it is preferable that the said core wire consists of a different kind of metal from the said terminal.

  Moreover, it is preferable that the said core wire consists of a metal which has aluminum as a main component, and the said terminal consists of a metal which has copper as a main component.

  According to the terminal-attached electric wire according to the present invention, the boundary line for specifying the predetermined determination region is provided on the outer surfaces of the first crimping portion and the two side wall portions in the wire crimping portion. Therefore, it can be easily confirmed by using the boundary line that the anticorrosive is applied to the determination region. And since the said anticorrosive agent has thermoplastic polyamide resin as a main component and each physical property of superposition tensile shear strength of aluminum, elongation rate, and water absorption is in a specific range, it has high corrosion resistance also from the material aspect. Sex is guaranteed. Therefore, the connection reliability in the wire crimping portion is excellent.

  At this time, when the thermoplastic polyamide resin is composed of a combination of dimer acid and / or dicarboxylic acid and diamine, the balance of physical properties such as superposition tensile shear strength, elongation, water absorption, melt viscosity, etc. It is good, and it is excellent in the balance between the coating property when the anticorrosive agent is applied to the terminal and the anticorrosion performance after application.

  Further, when the core wire is made of a metal different from the terminal, particularly when the core wire is made of a metal containing aluminum as a main component and the terminal is made of a metal containing copper as a main component, Since it becomes a metal connection, the effect of this invention can fully be exhibited.

It is a perspective view of the terminal concerning the embodiment of the present invention. It is a side view of the electric wire with a terminal to which the anticorrosive agent concerning the embodiment of the present invention is not applied. It is a top view of the electric wire with a terminal to which the anticorrosive agent concerning the embodiment of the present invention is not applied. It is a side view of the electric wire with a terminal concerning the embodiment of the present invention. It is a side view of the electric wire with a terminal concerning the embodiment of the present invention. It is the flowchart which showed the flow of implementation which concerns on embodiment of this invention. It is a figure for demonstrating typically the corrosion test method in an Example.

  The electric wire with terminal 1 includes an electric wire 10, a terminal 20, and an anticorrosion part 90 to which an anticorrosive agent 99 is attached.

  The electric wire 10 includes a core wire 12 composed of a plurality of strands 11 and a covering portion 13 that covers the core wire 12. Specifically, the electric wire 10 is configured by covering the periphery of the core wire 12 with a covering portion 13 made of an insulator such as a resin. At one end portion of the electric wire 10, the core wire 12 (hereinafter sometimes referred to as “core wire end portion 14”) exposed by peeling off the covering portion 13, and the end portion of the covering portion 13 on the core wire end portion 14 side ( Hereinafter, the terminal 1 may be referred to as “covered end 15”), and the terminal 20 is crimped to obtain the terminal-attached electric wire 1. In FIG. 1, the terminal 20 before being crimped to the electric wire 10 is shown.

  Next, the terminal 20 will be described. The terminal 20 is formed in a long shape. In the present embodiment, the side on which the electric wire 10 is crimped along the longitudinal direction of the terminal 20 is referred to as the other side, and the side opposite to the side on which the electric wire 10 is crimped is referred to as one side. The terminal 20 includes a terminal fitting portion 21 and a wire crimping portion 111, and the wire crimping portion 111 further includes a first connecting portion 32, a core wire crimping portion 42, a second connecting portion 52, and a covering crimping portion 62. . The terminal 20 includes a terminal fitting portion 21, a first connecting portion 32, a core wire crimping portion 42, a second connecting portion 52, and a covering crimping portion 62 in order from one side in the longitudinal direction to the other side. The terminal fitting portion 21, the core wire crimping portion 42, and the covering crimping portion 62 are formed apart from each other. The 1st connection part 32 connects the terminal fitting part 21 and the core wire crimping part 42 integrally. The second connecting portion 52 integrally connects the core wire crimping portion 42 and the covering crimping portion 62.

  The terminal 20 is formed by punching and then bending a flat metal plate having conductivity (hereinafter sometimes referred to as “conductive metal plate”). As the conductive metal plate, for example, a copper alloy plate such as a copper plate or brass, or a tin plating plate thereof is used. In the present embodiment, a case where the terminal 20 is a female terminal will be described.

  The terminal fitting portion 21 is a portion that is fitted to the connection counterpart terminal 200 that is a terminal to be connected and is electrically connected to the connection counterpart terminal 200. In the present embodiment, the connection partner terminal 200 is a male terminal, and the male terminal is inserted into and connected to the terminal fitting portion 21. In the present embodiment, the terminal fitting portion 21 is formed in a cylindrical shape that penetrates along the longitudinal direction of the terminal 20, specifically, a rectangular cylindrical shape. The terminal fitting portion 21 is formed with a protruding portion 24 that protrudes outward from the bottom portion 26. The protruding portion 24 is used for positioning when the terminal fitting portion 21 is connected to the connection partner terminal 200.

  A contact piece 25 that contacts the connection partner terminal 200 is provided inside the terminal fitting portion 21. The contact piece 25 folds a plate material extending in the longitudinal direction from the bottom portion 26 toward the bottom portion 26 side, bends the tip portion so that the folded portion becomes U-shaped, and the folded portion contacts the bottom portion 26. It is configured to touch. Therefore, the contact piece 25 can be elastically deformed with the folded portion being a fulcrum.

  The ceiling portion 27 facing the bottom portion 26 of the terminal fitting portion 21 is formed by overlapping the two canopies, that is, the first canopy 27a and the second canopy 27b. A locking claw 23 is formed in the first canopy 27a, and a locking hole 22 is formed in the second canopy 27b. The locking claw 23 is locked in the locking hole 22. Thereby, the deformation of the terminal fitting portion 21 is prevented, and the mechanical strength of the terminal fitting portion 21 is increased.

  Of the two canopies 27 a and 27 b, the first canopy 27 a on the bottom 26 side has a convex portion 27 c that protrudes toward the bottom 26. The convex portion 27c of the first canopy 27a and the contact piece 25 cooperate to elastically narrow the connection partner terminal 200 with a predetermined contact pressure. Thereby, the fitting force between the connection partner terminal 200 and the terminal 20 is increased.

  The first connecting portion 32 includes a bottom portion 36 that is continuous with the bottom portion 26 of the terminal fitting portion 21, and a pair of side wall portions 37 a and 37 b that rise from the bottom portion 36 and face each other.

  The core wire crimping portion 42 includes a bottom portion 46 and a pair of crimping pieces 43 a and 43 b that are crimped to the core wire end portion 14 of the electric wire 10 together with the bottom portion 46. And the crimping | compression-bonding pieces 43a and 43b are comprised by the crimping claws 44a and 44b crimped | bonded to a core wire, and side wall part 47a, 47b. The crimping claws 44a and 44b are connected to the side wall portions 47a and 47b and are formed to extend upward from the side wall portions 47a and 47b. The bottom 46 is connected to the bottom 36 of the first connecting part 32, the side wall 47 a is connected to the side wall 37 a of the first connecting part 32, and the side wall 47 b is connected to the side wall 37 b of the first connecting part 32. . In a stage before being crimped to the core wire end portion 14, the core wire crimping portion 42 is formed in an open barrel shape. In other words, the pair of crimping pieces 43a and 43b of the core wire crimping part 42 are opposed to each other and are in a state of rising from the bottom part 46 so as to protrude in one direction. In the following description, the direction in which the crimping pieces 43a and 43b are raised may be referred to as a “height direction”. The crimping claws 44a and 44b are examples of the “second crimping part” in the present invention.

  The second connecting portion 52 includes a bottom portion 56 and a pair of side wall portions 57a and 57b that rise from the bottom portion 56 and face each other. The bottom part 56 is connected to the bottom part 46 of the core wire crimping part 42, the side wall part 57 a is connected to the side wall part 47 a of the core wire crimping part 42, and the side wall part 57 b is connected to the side wall part 47 b of the core wire crimping part 42.

  The covering crimping part 62 includes a bottom 66 and a pair of crimping pieces 63 a and 63 b that are crimped to the covering end 15 of the electric wire 10 together with the bottom 66. The crimping pieces 63a and 63b are composed of crimping claws 64a and 64b that are crimped to the core wire 12, and side wall portions 67a and 67b. The crimping claws 64a and 64b are connected to the side wall portions 67a and 67b, and are formed to extend upward from the side wall portions 67a and 67b. The bottom 66 is connected to the bottom 56 of the second connecting part 52, the side wall 67a is connected to the side wall 57a of the second connecting part 52, and the side wall 67b is connected to the side wall 57b of the second connecting part 52. . The coated crimping part 62 is formed in an open barrel shape before being crimped to the coated end 15. In other words, the pair of crimping pieces 63a and 63b of the covering crimping portion 62 are opposed to each other, and are standing up so as to protrude from the bottom 66 in one direction. The crimping claws 64a and 64b are an example of the “first crimping part” in the present invention.

  In the following description, the bottom 36, the bottom 46, the bottom 56, and the bottom 66 may be collectively referred to as “bottom 6”. Further, the side wall 37a, the side wall 47a, the side wall 57a, and the side wall 67a may be collectively referred to as “side wall 7a”, and the side wall 37b, the side wall 47b, the side wall 57b, and the side wall 67b may be collectively referred to as “side wall 7b”. is there. That is, the bottom part 6 is a bottom part in the electric wire crimping part 111, and the side wall parts 7 a and 7 b are side wall parts in the electric wire crimping part 111. Therefore, the side wall portions 7a and 7b, the crimping claws 44a and 44b, and the crimping claws 64a and 64b form the side surfaces of the wire crimping portion 111 in the terminal 20 before being crimped to the electric wire 10.

  In the present embodiment, the boundary line 8a is formed on the outer side surface (hereinafter may be simply referred to as “side surface”) of the side wall portion 7a and the crimping claws 64a of the wire crimping portion 111 provided in the terminal 20 before crimping. Boundary lines 8b are shown on the outer side surfaces of the side wall 7b and the crimping claws 64b, respectively. For ease of explanation, only the boundary line 8a will be described in the following description, but the boundary line 8b is shown in the side wall portion 7b and the crimping claw 64b in the same manner as the boundary line 8a.

  The boundary line 8a includes the outer side surface of the side wall portion 37a in the first connecting portion 32, the outer side surface of the side wall portion 47a in the core wire crimping portion 42, the outer side surface of the side wall portion 57a in the second connecting portion 52, and the covering crimping portion. It is shown as a continuous line on the outer side surface of the crimping piece 63 a at 62. And the boundary line 8a is the edge part on the opposite side to the bottom part 6 in the height direction among the side walls 7a, the crimping claws 44a and the crimping claws 64a in the electric wire crimping part 111, that is, the side wall part 37a, the crimping claws. 44a, the side wall portion 57a, and the upper end of the side surface of the crimping claw 64a (hereinafter, may be referred to as “side upper end portion”). In the following, the side surface upper ends of the side wall portion 37a, the crimping claw 44a, the side wall portion 57a, and the crimping claw 64a may be collectively referred to as a series of “side surface upper end portions 71a”.

  In the present embodiment, as shown in FIG. 1, the boundary line 8a is composed of three boundary lines 81a, 82a, 83a. The first boundary line 81a is shown along the height direction at one end portion of the side wall portion 37a constituting the first connecting portion 32, that is, at the end portion of the side wall portion 37a connected to the terminal fitting portion 21. Has been. One end portion of the first boundary line 81a is a side surface upper end portion 371a of the first connecting portion 32, and the other end portion of the first boundary line 81a is a bottom portion 36 and a side surface upper end portion 371a of the outer side surfaces of the side wall portion 37a. Shown in a position between. The second boundary line 82 a is shown along the height direction on the outer side surface of the crimping piece 63 a in the covering crimping part 62. One end portion of the second boundary line 82a is a side surface upper end portion 641a of the crimping claw 64a, and the other end portion of the second boundary line 82a is shown on the outer side surface of the side wall portion 67a. At this time, the distance in the height direction from the other end portion of the first boundary line 81a to the bottom portion 36 is substantially equal to the distance in the height direction from the other end portion of the second boundary line 82a to the bottom portion 66. A third boundary line 83a is shown connecting the end portion on the bottom 36 side of the first boundary line 81a and the end portion on the bottom 66 side of the second boundary line 82a. That is, the 3rd boundary line 83a is shown ranging over each side surface of the side wall part 37a, the side wall part 47a, the side wall part 57a, and the side wall part 67a. Such a boundary line 8a is grooved and recessed with a predetermined depth on the outer side surface of the wire crimping portion 111.

  Thus, by showing the boundary line 8a, the boundary line 8a and the side surface upper end portion 71a partially surround the outer side surfaces of the side wall portion 7a, the crimping claws 44a, and the crimping claws 64a. An area is identified. This region represents a range (hereinafter, also referred to as “corrosion-preventing range 800”) in which the anticorrosive 99 needs to be attached to the outer side surface of the terminal 20 at a minimum. The anticorrosion range 800 is an example of the “determination area” in the present invention. The anticorrosion range 800 can be easily confirmed visually.

  On the other hand, the boundary line 8b is shown on the outer side surfaces of the side wall portion 7b and the crimping claws 64b in the same manner as the boundary line 8a (indicated by a dotted line in FIG. 1). Thus, the anticorrosion range 800 is specified by showing the boundary lines 8a and 8b.

  The core wire end portion 14 of the electric wire 10 is disposed between a pair of crimping pieces 43a and 43b opposed to the core wire crimping portion 42 (see FIG. 3). And the core wire crimping part 42 is crimped | bonded so that the outer periphery of a part in the longitudinal direction of the core wire edge part 14 may be covered. Specifically, the crimping claws 44 a and 44 b are crimped so as to embrace the core end 14 by crimping the tips of the crimping claws 44 a and 44 b toward the bottom 46.

  In the present embodiment, of the core wire end portion 14, an intermediate portion in the extending direction of the core wire 12 is crimped to the core wire crimping portion 42. Of the core wire end portion 14, a portion that is not crimped by the core wire crimping portion 42, that is, one side end portion and the other side end portion in the extending direction of the core wire end portion 14 are exposed from the terminal 20. Hereinafter, the part exposed from the terminal 20 among the strands 11 constituting the core wire end portion 14 is referred to as a “strand exposed portion 16”. In the present embodiment, the strand exposed portion 16 is a portion of the strand 11 constituting the core end 14 that is exposed from both longitudinal sides of the core crimping portion 42.

  The covering end 15 of the electric wire 10 is disposed between a pair of facing crimping pieces 63a and 63b of the covering crimping portion 62 (see FIG. 3). And the covering crimping | compression-bonding part 62 is crimped | bonded so that the outer periphery of a part in the longitudinal direction of the covering edge part 15 may be covered. Specifically, the ends of the crimping claws 64 a and 64 b are crimped toward the bottom 66, so that the crimping claws 64 a and 64 b are crimped so as to embrace the coated crimping part 62.

  Thus, the crimping claws 44a and 44b and the crimping claws 64a and 64b are crimped to obtain the terminal-attached electric wire 1 in which the terminal 20 and the electric wire 10 are connected. In the electric wire with terminal 1, the crimped crimping claws 44 a and 44 b are opposed to the bottom portion 46. The crimped claws 64a and 64b and the bottom 66 are also opposed. Second boundary lines 82a and 82b are shown on the outer side surfaces of the crimping claws 64a and 64b before crimping. For this reason, by crimping the crimping claws 64a and 64b, the second boundary lines 82a and 82b are shown on the outer surfaces of the crimping claws 64a and 64b facing the bottom 66. That is, when the terminal 20 is viewed from the side facing the bottom portion 6 in the height direction, the second boundary lines 82a and 82b are confirmed on the outer surfaces of the crimping claws 64a and 64b after crimping. In the terminal 20 before crimping, the boundary lines 8a and 8b are shown only on the outer side surface of the wire crimping portion 111. However, in the electric wire with terminal 1, boundary lines 8 a and 8 b are also shown on the outer upper surface of the electric wire crimping part 111 by crimping the crimping claws 64 a and 64 b. In this way, on the outer surfaces in the three directions of the terminal-attached electric wire 1 such as the side wall 7a, the side wall 7b, and the crimping claws 64a and 64b so as to surround the crimping claws 44a and 44b and the core wire end portion 14. The boundary lines 8a and 8b that specify the range 800 are shown.

  In the wire crimping portion 111 of the terminal-attached electric wire 1, the boundary line 8 a, the upper ends (side surface upper end portions 371 a and 571 a) of the first connecting portion 32 and the second connecting portion 52, and the first connecting portion 32 and the second connecting portion. The side wall portion 7a is composed of an end portion of the crimping claw 44a that is continuous with the upper end of 52 (a side upper end portion 441a of the crimping claw 44a before crimping) and an end portion of the crimping claw 64a (a side upper end portion 641a of the crimping claw 64a before crimping). An anticorrosion range 800 is provided to partially surround the outer surfaces of the crimping claws 44a and the crimping claws 64a. Similarly to the boundary line 8a, the boundary line 8b is also provided with an anticorrosion area 800 that partially surrounds the outer surfaces of the side wall portion 7b, the crimping claws 44b, and the crimping claws 64b.

  Further, in the bare wire exposed portion 16, a portion closer to the terminal fitting portion 21 than the core wire crimping portion 42 is referred to as “fitting side exposed portion 16 a”, and a portion closer to the covering crimping portion 62 than the core wire crimping portion 42 is referred to. This is referred to as “covered exposed portion 16b”. In the wire crimping portion 111 of the terminal 20, the portion closer to the terminal fitting portion 21 than the core wire crimping portion 42 is the first connecting portion 32. The fitting-side exposed portion 16 a is a portion of the strand 11 that is placed on the bottom portion 36 of the first connecting portion 32. In a state in which the terminal 20 is crimped to the electric wire 10, the terminal fitting portion 21 of the terminal 20 and the fitting-side exposed portion 16 a of the electric wire 10 are not in contact with each other and are spaced apart in the longitudinal direction of the terminal 20. ing.

  In this Embodiment, the strand 11 of the electric wire 10 and the terminal 20 are comprised with the dissimilar metal. Specifically, the strand 11 of the electric wire 10 is made of aluminum or an aluminum alloy, and the terminal 20 is made of a copper alloy plate such as a copper plate or brass, or a tin plating plate thereof. Comparing the metal material constituting the strand 11 of the electric wire 10 and the metal material constituting the terminal 20, the metal material constituting the strand 11 is more standard electrode potential than the metal material constituting the terminal 20. Is in a low relationship. Under this relationship, if an aqueous electrolyte solution such as salt water adheres to the contact portion between the wire crimping portion 111 of the terminal 20 and the core wire end portion 14 of the wire 10, electrolytic corrosion, which is a type of corrosion, is applied to the core wire end portion 14. appear. In the terminal-attached electric wire 1, the anticorrosive 99 is applied to prevent the occurrence of electrolytic corrosion (corrosion) on the core wire end portion 14, thereby forming the anticorrosion portion 90.

  Here, the anticorrosive 99 has a thermoplastic polyamide resin as a main component. The thermoplastic polyamide resin is preferably composed of a combination of dimer acid and / or dicarboxylic acid and diamine. This is because the balance of physical properties such as superposition tensile shear strength, elongation rate, water absorption rate, melt viscosity, etc. is good, and the balance between coating properties and anticorrosion performance is excellent.

  The anticorrosive 99 may be composed of a thermoplastic polyamide resin alone, or two or more thermoplastic polyamide resins may be mixed. Furthermore, if necessary, additives, other polymers, and the like may be mixed as long as the physical properties are not impaired.

  The additive is not particularly limited as long as it is an additive generally used for resin molding materials. Specifically, for example, inorganic fillers, antioxidants, metal deactivators (copper damage inhibitors), UV absorbers, UV masking agents, flame retardant aids, processing aids (lubricants, waxes, etc.), Examples thereof include carbon and other coloring pigments.

  The anticorrosive 99 can be crosslinked as necessary for the purpose of increasing heat resistance and mechanical strength. There are no particular limitations on the means of crosslinking, such as thermal crosslinking, chemical crosslinking, silane crosslinking, electron beam crosslinking, and ultraviolet crosslinking. The crosslinking treatment of the anticorrosive 99 may be performed after the anticorrosive 99 is applied.

The anticorrosive 99 has an overlap tensile shear strength between aluminum measured in accordance with JIS K6850 of 6 N / mm ² or more. Note that JIS K6850 (“Adhesive—Test Method for Tensile Shear Adhesive Strength of Rigid Adherents”) uses a standard test piece and is an adhesive bonded product between rigid adherends under specified adjustment and test conditions. Defines the method of measuring the tensile tensile shear strength of In the present application, an Al plate is used as the rigid adherend, and the above-described anticorrosive agent 99 is used as the adhesive layer sandwiched between the Al plates to produce a test piece.

When the superposition tensile shear strength is less than 6 N / mm ² , it is difficult to sufficiently adhere to the anticorrosion range 800 even if the anticorrosive 99 is melted. Therefore, it becomes difficult to obtain a high anticorrosion effect. The overlapping tensile shear strength is preferably 7 N / mm ² or more, more preferably 8 N / mm ² or more. In addition, since it is desirable to have sufficient adhesiveness, the upper limit of the said overlap tensile shear strength is not specifically limited.

  Moreover, the corrosion inhibitor 99 has an elongation percentage (at room temperature of 24 ° C.) measured in accordance with ASTM D-1708 of 100% or more.

  When the elongation percentage is less than 100%, shrinkage cracking is likely to occur when the coating is cooled and solidified after being melt coated in the anticorrosion range 800. For this reason, moisture enters from the cracked portion, and it is difficult to obtain a high anticorrosive effect. The elongation is preferably 150% or more, and more preferably 200% or more. In addition, since it is desirable to have sufficient elongation, the upper limit of the elongation rate is not particularly limited.

  Further, the anticorrosive 99 has a water absorption rate of 1.0% or less as measured in accordance with JIS K7209. In addition, the said water absorption is a value measured by A method on the conditions of immersion period: 7 days, test piece shape: sheet shape.

  When the water absorption rate exceeds 1.0%, the anticorrosive 99 is likely to absorb water depending on the use environment such as in a vehicle environment, and it is difficult to obtain a high anticorrosive effect. The water absorption rate is preferably 0.8% or less, and more preferably 0.5% or less. In addition, since it is so desirable that there is little water absorption, the minimum of the said water absorption is not specifically limited.

  The anticorrosive 99 of the above-described material is applied to the wire crimping portion 111 so as to cover the core wire end portion 14 from the opposite side of the bottom 6 constituting the wire crimping portion 111. In the present embodiment, the anticorrosive 99 is applied from the central portion of the first connecting portion 32 in the longitudinal direction of the terminal 20 to the central portion of the cover crimping portion 62 in the longitudinal direction of the terminal 20. Thereby, the anticorrosive 99 is applied to the exposed wire portion 16 of the electric wire 10, the first connecting portion 32 of the terminal 20, the core wire crimping portion 42, the second connecting portion 52, the covering crimping portion 62, and the covering end portion 15 of the electric wire 10. Is done.

  On the crimped claws 44a and 44b, the crimp claws 64a and 64b, the outer side surfaces of the side wall portions 47a and 47b, and the outer side surfaces of the side wall portions 67a and 67b, the core wire crimp portion 42 and the covering crimp portion 62 The applied anticorrosive 99 is solidified. Part of the anticorrosive 99 applied to the exposed wire portion 16 and the covering end portion 15 is solidified on the outer side surfaces of the side wall portions 37a and 37b and the side wall portions 57a and 57b, but mainly the side wall portions 37a and 37b. Further, it penetrates into the inner side of the electric wire crimping portion 111 along the inner side surfaces of the side wall portions 57a and 57b. When the anticorrosive 99 penetrates into the terminals 20, gaps formed between the wires 11 and between the wires 11 and the terminals 20 are filled with the anticorrosive 99.

  Thus, by applying the anticorrosive 99, the wire crimping portion 111 is covered with the anticorrosive 99. At this time, there is a partial region where the anticorrosive 99 is not attached to the outer side surfaces of the side walls 7a and 7b, even though the anticorrosive 99 is required to be attached to the minimum. In this case, an aqueous electrolyte solution such as salt water may enter the terminal 20 from the region where the anticorrosive 99 is not attached. In particular, a fitting-side exposed portion 16 a is disposed inside the first connecting portion 32, and a covering-side exposed portion 16 b is disposed inside the second connecting portion 52. Therefore, there is a risk that the aqueous electrolyte solution that has entered the inside of the terminal 20 adheres to the contact portion between the core wire 12 and the wire crimping portion 111 in the fitting-side exposed portion 16a and the covering-side exposed portion 16b, and the core wire 12 is corroded. There is.

  In the present embodiment, boundary line 8a is shown on the outer surface of side wall 7a and crimping claw 64a of electric wire 1 with terminal, and boundary line 8b is shown on the outer surface of side wall 7b and crimping claw 64b. Yes. By these boundary lines 8a and 8b, the anticorrosion range 800 to which the anticorrosive 99 needs to be attached at the minimum is specified on the outer surface of the wire crimping portion 111. Therefore, the anticorrosion range 800 can be easily confirmed on the outer surface of the wire crimping portion 111.

  In the present embodiment, the boundary line 8a that specifies the anticorrosion range 800 is configured by a first boundary line 81a, a second boundary line 82a, and a third boundary line 83a. The boundary line 8b includes a first boundary line 81b, a second boundary line 82b, and a third boundary line 83b. The adhesion range of the anticorrosive 99 for preventing the electrolyte aqueous solution from entering the inside of the terminal 20 along the outer side surface of the side wall portions 7a and 7b from the bottom 6 side is indicated by the third boundary lines 83a and 83b. Moreover, the adhesion range of the anticorrosive 99 for preventing the electrolyte aqueous solution from entering the inside of the terminal 20 from one side to the other side of the wire crimping portion 111 is indicated by the first boundary lines 81a and 81b. Further, the adhesion range of the anticorrosive 99 for preventing the electrolyte aqueous solution from entering the inside of the terminal 20 from the other side of the terminal 20 toward the one side is indicated by the second boundary lines 82a and 82b. The second boundary lines 82a and 82b are shown not only in the side wall portions 67a and 67b which are the side surfaces of the coated crimp portion 62 in the wire crimp portion 111 but also in the crimp claws 64a and 64b on the upper surface. For this reason, it can be determined whether or not the anticorrosive 99 is properly attached to the outer upper surface of the wire crimping portion 111.

  In FIG. 4, a region 500 and a region 550, which are regions where the anticorrosive agent 99 does not exist, are provided by being surrounded by the boundary line 8 a and the outer edge 991 of the anticorrosive agent 99. That is, the anticorrosive 99 covers a part of the anticorrosion range 800, but the outer edge 991 of the anticorrosive 99 does not partially exceed the boundary 8 a, and is partially covered with the anticorrosive 99 in the anticorrosion range 800. Regions (region 500, region 550) that are not provided are provided. Thus, since the anticorrosion agent 99 does not completely cover the anticorrosion range 800, the anticorrosive agent 99 adheres to the outer surface of the terminal 20, but there is a possibility that the aqueous electrolyte solution may enter the inside of the terminal 20.

  In FIG. 5, the anticorrosive 99 covers the anticorrosion range 800, and the outer edge 991 of the anticorrosive 99 is located beyond the boundary line 8a or on the boundary line 8a. The anticorrosive 99 completely covers the anticorrosion range 800.

  Thus, in the present embodiment, the boundary of the anticorrosion range 800 which is the outer surface of the terminal 20 and to which the anticorrosion material 99 needs to be attached at a minimum is specified by the boundary lines 8a and 8b. Therefore, the anticorrosion range 800 can be easily distinguished from other regions of the terminal 20, and the anticorrosion agent 99 covers the anticorrosion range 800 and the outer edge 991 exceeds the boundary lines 8a and 8b. It can be easily confirmed that the anticorrosive 99 completely covers the range 800. Furthermore, since the anticorrosive 99 is mainly composed of a thermoplastic polyamide resin, and the physical properties of the overlap tensile shear strength, elongation rate, and water absorption rate of aluminum are in a specific range, the corrosion resistance is also high from the material aspect. Sex is guaranteed. Therefore, the connection reliability in the wire crimping portion 111 is excellent.

  Such a terminal-attached electric wire 1 is suitable for an electric wire of an automobile wire harness. In an automobile, an aqueous electrolyte solution such as salt water can easily enter from the outside, and the infiltrated moisture tends to adhere to the contact portion between the terminal 20 and the core wire 12 of the electric wire 10. In the electric wire with terminal 1 in the present embodiment, since the boundary lines 8a and 8b are shown on the outer surface of the wire crimping portion 111 in order to specify the corrosion prevention range 800, the corrosion prevention range 800 can be easily confirmed. it can. For this reason, the terminal-attached electric wire 1 to which the anticorrosive 99 having excellent anticorrosive performance in terms of material is appropriately attached within the range where the anticorrosive 99 is required to be attached to the terminal 20 at a minimum, which is high quality in terms of corrosion prevention. Only can be used for the wire harness for automobiles.

  The above-described terminal-attached electric wire 1 is manufactured as follows, and it is determined whether the anticorrosive 99 completely covers the anticorrosion range 800 provided in the electric wire crimping portion 111.

  FIG. 6 is a flowchart showing the flow of implementation of the present invention. In the preparation step, the terminal 20 shown in FIG. 1 is prepared (step S1). The terminal 20 is obtained by processing a conductive metal plate. For example, the conductive metal plate is formed by stamping and pressing, and then bent by bending to produce the terminal 20. At this time, boundary lines 8a and 8b are shown by performing serration processing on the conductive metal plate.

  In the crimping process, the electric wire 10 is crimped to the terminal 20 (step S2). The covering portion 13 at one end of the electric wire 10 is peeled off to expose the core wire 12. Next, the electric wires are arranged such that the core wire end portion 14 is positioned between the crimping pieces 43a and 43b of the core wire crimping portion 42 and the covering end portion 15 is positioned between the crimping pieces 63a and 63b of the covering crimping portion 62. 10 is placed on the bottom 26. And the electric wire 10 and the terminal 20 are crimped | bonded by crimping the core wire crimping part 42 and the covering crimping part 62. FIG. Thus, after the electric wire 10 is fixed to the terminal 20, the process proceeds to the anticorrosive coating step.

  In the anticorrosive agent application step, the anticorrosive agent 99 is applied to the wire crimping portion 111 from the opposite side of the bottom portion 6 so as to cover the core wire end portion 14 to form the anticorrosion portion 90 (step S3). In the present embodiment, the anticorrosive 99 is applied from the first connecting portion 32 to the covering crimping portion 62 in the electric wire with terminal 1. The anticorrosive 99 is applied in a liquid state melted by heating. After application, the anticorrosive part 90 is formed by cooling and solidifying the anticorrosive 99. The terminal-attached electric wire 1 is manufactured as described above.

  Subsequently, it is determined whether or not the anticorrosive agent 99 completely covers the anticorrosion range 800 provided in the electric wire crimping portion 111 (step S4).

  Specifically, if the anticorrosive 99 covers the anticorrosive range 800 and the outer edge 991 of the anticorrosive 99 exceeds the boundary lines 8a and 8b, the anticorrosive 99 completely covers the anticorrosive range 800. . Further, when the outer edge 991 of the anticorrosive 99 does not partially exceed the boundary lines 8a and 8b, the anticorrosive 99 does not completely cover the anticorrosion range 800. Thus, by showing the boundary lines 8a and 8b, it can be easily determined whether the outer edge 991 of the anticorrosive 99 exceeds the boundary of the anticorrosion range 800. Therefore, it can be easily confirmed whether the anticorrosive 99 completely covers the range where the anticorrosive 99 needs to be adhered at a minimum.

  As described above, in the present embodiment, the boundary lines 8a and 8b are shown on the electric wire crimping portion 111, whereby the anticorrosion range 800 where the anticorrosive 99 needs to be attached to the terminal 20 at a minimum can be specified. . Therefore, the anticorrosive 99 completely covers the anticorrosive range 800 by confirming that the anticorrosive 99 covers the anticorrosive range 800 and that the outer edge 991 of the anticorrosive 99 exceeds the boundary lines 8a and 8b. This can be easily confirmed. Therefore, since the application | coating defect of the anticorrosive 99 in the electric wire 1 with a terminal can be found easily, it can prevent beforehand that an electric wire with a defective terminal distribute | circulates to a market.

  Note that the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the boundary lines 8a and 8b are configured by the first boundary lines 81a and 81b, the second boundary lines 82a and 82b, and the third boundary lines 83a and 83b. Is not limited. If the boundary lines 8a and 8b are shown on the outer surface of the wire crimping part 111 so as to surround the end opposite to the bottom 6 along the height direction, how are the boundary lines 8a and 8b It may be shown.

  Further, the color of the anticorrosive 99 and the color of the terminal 20 may be different. Since visibility improves by this, it becomes easier to determine whether the outer edge 991 of the anticorrosive 99 exceeds the boundary lines 8a and 8b that specify the anticorrosion range 800.

  Moreover, in the said embodiment, although the boundary lines 8a and 8b were recessedly provided in the outer surface in the electric wire crimping part 111, it is not restricted to such a form. For example, the form shown by protrudingly provided on the outer surface of the wire crimping portion 111 may be used.

  Moreover, in the said embodiment, although the strand 11 which comprises the core wire 12 of the electric wire 10 was aluminum or aluminum alloy, it is not limited to this, You may be comprised with another metal material. Absent. Moreover, although the electroconductive metal plate which comprises the terminal 20 is a copper plate, a copper alloy plate, or these tin plating plates, it is not limited to this, You may be comprised with another metal material. The terminal 20 and the electric wire 1 with a terminal of the present invention are suitable when the metal material constituting the wire 11 is lower in the standard electrode potential than the metal material constituting the terminal 20.

  Moreover, in the said embodiment, although the terminal 20 was a female terminal, it is not restricted to such a form. In the male terminal, the present invention may be used.

  Hereinafter, the present invention will be described in detail with reference to examples. In addition, as for the electric wire with a terminal demonstrated below, the anticorrosion agent has completely covered the anticorrosion range. Therefore, the following examples investigate the difference in anticorrosion performance due to the difference in the material of the anticorrosive.

1. Electric wire production 100 parts by weight of polyvinyl chloride (degree of polymerization 1300), 40 parts by weight of diisononyl phthalate as plasticizer, 20 parts by weight of calcium bicarbonate as filler, 5 parts by weight of calcium zinc stabilizer as stabilizer A polyvinyl chloride composition was prepared by mixing at 180 ° C. with a roll and forming into a pellet with a pelletizer.

  Next, using a 50 mm extruder, the polyvinyl chloride composition obtained above was 0.28 mm thick around a core wire (cross-sectional area 0.75 mm) made of an aluminum alloy twisted wire in which seven aluminum alloy wires were twisted together. And extrusion coated. This produced the electric wire (PVC electric wire).

2. Electric wire with terminal After peeling off the end of the produced electric wire and exposing the core wire, a male terminal made of brass (tab width 0.64 mm, electric wire) with a boundary line written on the electric wire crimping part as defined in the present invention A first crimping portion for crimping the covering portion and a second crimping portion for crimping the core wire) were crimped and crimped to the end of the electric wire.

  Next, the following various anticorrosive agents were applied so as to exceed the boundary of the anticorrosion range of the electric wire crimping portion, and an electric wire with a terminal in which the anticorrosion range was completely covered with the anticorrosive agent was produced. Various anticorrosives were heated to 230 ° C. to form a liquid, applied at a thickness of 0.05 mm, and solidified.

Example 1
Thermoplastic polyamide resin (A) [manufactured by Henkel Japan KK, "Macromelt (registered trademark) 6801"]
(Example 2)
Thermoplastic polyamide resin (B) [manufactured by Henkel Japan KK, "Macromelt (registered trademark) JP116"]
Example 3
Thermoplastic polyamide resin (C) [manufactured by Henkel Japan KK, "Macromelt (registered trademark) 6301"]
(Comparative Example 1)
Thermoplastic polyamide resin (a) [manufactured by Henkel Japan KK, “Macromelt (registered trademark) 6217”]
(Comparative Example 2)
Thermoplastic polyamide resin (b) [manufactured by Henkel Japan KK, “Macromelt (registered trademark) 6030”]
(Comparative Example 3)
Thermoplastic polyamide resin (c) [manufactured by Henkel Japan KK, "Macromelt (registered trademark) 6880"]

3. Evaluation Method Using a terminal-attached electric wire coated with various anticorrosive agents, the presence or absence of cracks and the evaluation of anticorrosion performance were performed as follows.

(crack)
After applying each anticorrosive agent, it was left in the air for 1 day, and the cracks were visually observed using a microscope. A case where no crack was observed was marked with ◯, and a case where crack was seen was marked with ×.

(Anti-corrosion performance)
As shown in FIG. 7, the manufactured terminal-attached electric wire 100 is connected to the + pole of the 12V power supply 200, and a pure copper plate 300 (width 1 cm × length 2 cm × thickness 1 mm) is connected to the −pole of the 12V power supply 200, with a terminal. The wire crimping portion between the core wire and the terminal of the wire 100 and the pure copper plate 300 were immersed in 300 cc NaCl 5% aqueous solution 400 and energized at 12 V for 2 minutes. After energization, ICP emission analysis of NaCl 5% aqueous solution 400 was performed, and the elution amount of aluminum ions from the core wire of the terminal-attached electric wire 100 was measured. The case where the elution amount was less than 0.1 ppm was designated as “◯”, and the case where the elution amount was 0.1 ppm or more was designated as “x”.

  Measured in accordance with JIS K7209, the overlapping tensile shear strength of aluminum measured in accordance with JIS K6850 of each anticorrosive, the elongation measured in accordance with ASTM D-1708 (normal temperature 24 ° C.), The water absorption rate (Method A, immersion period: 7 days, test piece shape: sheet shape) and evaluation results are shown together in Table 1.

  According to Table 1, the following can be understood. That is, in Comparative Example 1, the superposition tensile shear strength and water absorption rate of the anticorrosive agent are outside the scope of the present invention. Therefore, the adhesiveness is poor, water is easily absorbed, and the anticorrosion performance is inferior.

  Comparative Example 2 is that the anti-corrosive overlay tensile shear strength and elongation are outside the scope of the present invention. Therefore, the adhesiveness is poor and the anticorrosion performance is inferior due to water immersion due to cracking.

  In Comparative Example 3, all of the anti-corrosive overlay tensile shear strength, elongation rate and water absorption rate are outside the scope of the present invention. Therefore, the adhesiveness is poor, it is easy to absorb water, there is also water immersion due to cracking, and the anticorrosion performance is inferior.

  On the other hand, the examples all use an anticorrosive agent within the ranges of the overlap tensile shear strength, elongation rate and water absorption rate specified in the present invention. Therefore, it can be sufficiently adhered to the wire crimping portion and water absorption can be prevented. In addition, the coating property is excellent compared to grease and the like, and cracking or the like hardly occurs due to shrinkage due to cooling after the application of the anticorrosive agent. As a result, excellent anticorrosion performance can be exhibited.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Electric wire with a terminal 8a, 8b Boundary line 10 Electric wire 20 Terminal 21 Terminal fitting part 32 1st connection part 42 Core wire crimping part 52 2nd connection part 62 Covering crimping part 90 Corrosion prevention part 99 Anticorrosive 71a Side upper end part 111 Electric wire crimping part 800 corrosion protection range

Claims (4)

A terminal-equipped electric wire comprising: an electric wire; and a terminal in which a terminal fitting portion connected to an electric wire crimping portion and a counterpart terminal that holds an end portion of the electric wire is integrally formed,
The wire crimping portion of the terminal is
Two side wall portions facing from both sides sandwiching the end portion of the electric wire;
A bottom portion connecting the two side wall portions;
A first crimping portion formed extending from each of the two side wall portions and crimped to a covering portion at an end of the electric wire;
A second crimping portion that is formed extending from each of the two side wall portions and is crimped to a core wire extending from the covering portion;
With
Over the range from the first crimping part to the terminal fitting part side of the second crimping part on the outer surfaces of the first crimping part and the two side wall parts in the wire crimping part, A boundary line that specifies a predetermined determination region surrounding the second crimping portion and the core wire portion in three directions is described,
The anticorrosive covering the second crimping part and the core wire is applied over a region including at least the determination region specified by the boundary line,
The anticorrosive is
The main component is thermoplastic polyamide resin,
Overlap tensile shear strength between aluminum measured in accordance with JIS K6850 is 6 N / mm ² or more,
100% or more elongation measured in accordance with ASTM D-1708,
A terminal-attached electric wire characterized by having a water absorption rate of 1.0% or less measured in accordance with JIS K7209.   The said thermoplastic polyamide resin is comprised from the combination of dimer acid and / or dicarboxylic acid, and diamine, The electric wire with a terminal of Claim 1 characterized by the above-mentioned.   The said core wire consists of a different kind of metal from the said terminal, The electric wire with a terminal of Claim 1 or 2 characterized by the above-mentioned.   The said core wire consists of a metal which has aluminum as a main component, and the said terminal consists of a metal which has copper as a main component, The electric wire with a terminal of Claim 3 characterized by the above-mentioned.

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