JP5869978B2 - Electric wire with terminal - Google Patents

Description

  The present invention relates to an electric wire with a terminal. More specifically, the present invention relates to a terminal-attached electric wire in which a corrosion-proof material is provided around the connection portion between the electric wire conductor and the crimp terminal.

  In recent years, from the viewpoint of improving fuel efficiency by reducing the weight of vehicles, examples of using aluminum for covered electric wires constituting a wire harness are increasing. And as a terminal metal fitting connected to such a covered electric wire, generally copper or a copper alloy excellent in electric characteristics is used. However, if the material of the conductor of the covered electric wire is different from that of the terminal fitting, corrosion tends to occur at the contact portion between the conductor and the terminal fitting. Therefore, an anticorrosive material that can prevent corrosion of the contact portion is required.

  Conventionally, there has been disclosed a crimp connection structure in which a hot melt molding portion is formed by sealing an entire connection portion between a terminal fitting and a core wire of a battery cable with a thermoplastic polymer (see, for example, Patent Document 1). And as the said thermoplastic polymer, hot-melt materials, such as a thermoplastic polyamide type, a polypropylene type, and a moisture hardening type urethane type, are mentioned. Further, the hot melt molding part is formed by inserting the connecting part into a cavity of an injection mold and injecting a thermoplastic polymer into the mold.

JP 2006-286385 A

  However, conventionally, when trying to increase the adhesive strength between the thermoplastic polymer and the terminal metal fitting, the adhesive strength to the mold also increases, so a mold release treatment is required to facilitate the release from the mold. there were. Specifically, it was necessary to apply a release material to the mold before injection molding, or to treat the surface of the mold with silicon or fluorine. Furthermore, when the adhesiveness of the thermoplastic polymer is high, there is a problem that even if such a mold release treatment is performed, it is difficult to release the mold from the mold and productivity is lowered. In addition, since the durability of the mold release treatment is usually low, there is a risk that defects may occur in the quality after molding.

  The present invention has been made in view of the problems of such conventional techniques. An object of the present invention is to provide a terminal-attached electric wire that can be easily released from a mold and can improve productivity while preventing corrosion at the connection portion between the electric wire and the crimp terminal over a long period of time. It is to provide.

  The electric wire with a terminal according to the first aspect of the present invention includes an electric wire having a conductor and a wire covering material covering the conductor, a crimp terminal connected to the conductor of the electric wire, a periphery of a connection portion between the conductor and the crimp terminal, and a connection And an anticorrosion material integrally formed around the wire covering material adjacent to the portion. Moreover, the anticorrosive material has a thermoplastic polyamide resin as a main component. Furthermore, the peel adhesion strength between the anticorrosion material and the terminal material of the crimp terminal is 0.1 N / mm or more and 0.74 N / mm or less, and the peel adhesion strength between the corrosion protection material and the wire coating material is 0.5 N / mm. That's it. And the embrittlement temperature of an anticorrosion material is 0 degrees C or less, and the melt flow rate of an anticorrosion material is 26 g / 10min or more.

  The electric wire with a terminal according to the second aspect of the present invention is the electric wire with a terminal according to the first aspect, wherein the conductor is made of aluminum or an aluminum alloy. The terminal material of the crimp terminal is made of at least one of copper, copper alloy, stainless steel, tin-plated copper, tin-plated copper alloy, and tin-plated stainless steel. Furthermore, the wire covering material is made of at least one of polyethylene, polypropylene, ethylene copolymer, propylene copolymer, and polyvinyl chloride.

  The wire harness which concerns on the 3rd aspect of this invention contains the electric wire with a terminal of the 1st or 2nd aspect.

  The method of manufacturing a terminal-attached electric wire according to the fourth aspect of the present invention includes a step of connecting a conductor and an electric wire having a wire covering material covering the conductor, a crimp terminal connected to the conductor of the electric wire, and the conductor and the crimp terminal. A step of forming an anticorrosive material by injection molding around the connection portion and around the wire covering material adjacent to the connection portion. Moreover, the anticorrosive material has a thermoplastic polyamide resin as a main component. Furthermore, the peel adhesion strength between the anticorrosion material and the terminal material of the crimp terminal is 0.1 N / mm or more and 0.74 N / mm or less, and the peel adhesion strength between the corrosion protection material and the wire coating material is 0.5 N / mm. That's it. And the embrittlement temperature of an anticorrosion material is 0 degrees C or less, and the melt flow rate of an anticorrosion material is 26 g / 10min or more.

  The electric wire with a terminal of the present invention can prevent the corrosion-causing substance from entering from the contact interface between the anticorrosive material, the crimp terminal, and the electric wire covering material. Therefore, even when the conductor of the electric wire and the crimp terminal are made of different metal materials, corrosion at the connection portion between the conductor and the crimp terminal can be prevented over a long period of time. Furthermore, the mold release property of the anticorrosive material from the mold can be improved, and the productivity can be increased.

FIG. 1 shows an electric wire with a terminal according to an embodiment of the present invention. Fig.1 (a) is a perspective view which shows the said electric wire with a terminal, FIG.1 (b) is a side view which shows a part of the said electric wire with a terminal. FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a schematic view showing a state before connecting the electric wire to the crimp terminal in the electric wire with terminal according to the embodiment of the present invention. FIG. 4 is a schematic diagram illustrating a state where the electric wire is connected to the crimp terminal in the electric wire with terminal according to the embodiment of the present invention. FIG. 5 is a perspective view showing the wire harness according to the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the dimension ratio of drawing is exaggerated on account of description, and may differ from an actual ratio.

[Wire with terminal]
As shown in FIGS. 1 to 4, the electric wire with terminal 1 of the present embodiment includes an electric wire 10 having a conductor 11 and an electric wire covering material 12 covering the conductor 11, and a crimp terminal 20 connected to the conductor 11 of the electric wire 10. Prepare. Furthermore, the terminal-attached electric wire 1 includes an anticorrosion material 30 integrally formed around the connection portion between the conductor 11 and the crimp terminal 20 and around the electric wire covering material 12 adjacent to the connection portion.

  The crimp terminal 20 in the terminal-attached electric wire 1 is of a female type, and has an electrical connection portion 21 connected to a counterpart terminal (not shown) at the front thereof. The electrical connecting portion 21 incorporates a spring piece that engages with the counterpart terminal, and has a box-like shape. Furthermore, at the rear part of the crimp terminal 20, there is an electric wire connecting part 22 that is connected by crimping to the terminal part of the electric wire 10 via the connecting part 23.

  The electric wire connecting portion 22 includes a conductor crimping portion 24 located on the front side and a covering material crimping portion 25 located on the rear side.

  The front conductor crimping portion 24 is in direct contact with the conductor 11 exposed by removing the wire covering material 12 at the end of the electric wire 10, and has a bottom plate portion 26 and a pair of conductor crimping pieces 27. The pair of conductor crimping pieces 27 extends upward from both side edges of the bottom plate portion 26 and is bent inward so as to wrap the conductor 11 of the electric wire 10, thereby bringing the conductor 11 into close contact with the upper surface of the bottom plate portion 26. Tighten like so. By the bottom plate portion 26 and the pair of conductor crimping pieces 27, the conductor crimping portion 24 is formed in a substantially U shape in a sectional view.

  The rear covering material crimping portion 25 is in direct contact with the wire covering material 12 at the terminal portion of the electric wire 10 and has a bottom plate portion 28 and a pair of covering material crimping pieces 29. The pair of covering material crimping pieces 29 extends upward from both side edges of the bottom plate portion 28 and is bent inward so as to wrap the portion with the wire covering material 12 at the terminal portion of the electric wire 10. 12 is crimped so as to be in close contact with the upper surface of the bottom plate 28. By the bottom plate portion 28 and the pair of covering material crimping pieces 29, the covering material crimping portion 25 is formed in a substantially U shape in a sectional view. Here, the bottom plate portion 26 of the conductor crimping portion 24 to the bottom plate portion 28 of the covering material crimping portion 25 are continuously formed as a common bottom plate portion.

  In this embodiment, as shown in FIG.3 and FIG.4, the terminal part of the electric wire 10 is inserted in the electric wire connection part 22 of the crimp terminal 20 of the said structure. As a result, the conductor 11 of the electric wire 10 is placed on the upper surface of the bottom plate portion 26 of the conductor crimping portion 24, and the portion of the electric wire 10 with the electric wire covering material 12 attached to the upper surface of the bottom plate portion 28 of the covering material crimping portion 25. Place. And the conductor crimping | compression-bonding part 24 and the coating | covering material crimping part 25 are deformed by pressing the electric wire connection part 22 and the terminal part of the electric wire 10. FIG. That is, the pair of conductor crimping pieces 27 of the conductor crimping portion 24 are bent inward so as to wrap the conductor 11, so that the conductor 11 is crimped so as to be in close contact with the upper surface of the bottom plate portion 26. Further, the pair of covering material crimping pieces 29 of the covering material crimping portion 25 is bent inward so as to wrap the portion with the wire covering material 12 so that the wire covering material 12 is in close contact with the upper surface of the bottom plate portion 28. Clamp it so that By doing so, the crimp terminal 20 and the electric wire 10 can be crimped and connected.

  And in this embodiment, as shown in FIG. 1, the circumference | surroundings of the conductor 11 covered by the connection part 23, the electric wire connection part 22, the electric wire connection part 22, and the electric wire coating | covering material 12 are coat | covered with the anticorrosion material 30. That is, the anticorrosion material 30 covers the boundary between the conductor crimping portion 24 and the tip of the conductor 11 of the electric wire 10 up to a part of the connecting portion 23, and also covers the boundary between the coating material crimping portion 25 and the wire coating material 12. It covers even part of the wire covering material 12 across the bridge. And the anticorrosion material 30 is formed in the terminal connection part of the electric wire 10 by integrally molding the material which adhere | attaches both the crimp terminal 20 and the electric wire coating | covering material 12. FIG. As described above, the conductor 11 and the wire covering material 12 covered with the wire connecting portion 22 are completely covered with the anticorrosive material 30, thereby ensuring the anticorrosion performance at the contact portion between the conductor 11 and the wire connecting portion 22. Can be secured.

  As shown in FIG. 1, the anticorrosion material 30 has a substantially rectangular parallelepiped first anticorrosion portion 31 covering the periphery of the connecting portion 23 and the conductor crimping portion 24, and a substantially rectangular parallelepiped shape covering the periphery of the covering material crimping portion 25. And a second anticorrosion part 32. A chamfered portion 34 is formed at the corners of the first anticorrosion portion 31 and the second anticorrosion portion 32 in order to facilitate insertion of a connector to be described later into a cavity.

  And as shown in FIG.1 (b), the lower surface of the 1st anticorrosion part 31 and the lower surface of the 2nd anticorrosion part 32 are formed flush | planar. However, the upper surface of the second anticorrosion part 32 is formed higher than the upper surface of the first anticorrosion part 31 in order to cover the entire wire 10 and the covering material crimping piece 29. Therefore, an inclined surface 33 is provided between the upper surface of the first anticorrosion part 31 and the upper surface of the second anticorrosion part 32.

  Moreover, the anticorrosion material 30 is formed in the cross-sectional substantially rectangular shape, as shown in FIG. In the present embodiment, the widths of the first anticorrosion part 31 and the second anticorrosion part 32 are the same, but in order to form the anticorrosion material 30 having a sufficient thickness around the covering material crimping part 25. The width of the second anticorrosion part 32 may be larger than the width of the first anticorrosion part 31.

  Here, it is preferable that the anticorrosion material 30 has a thermoplastic polyamide resin as a main component. By using such a material as the anticorrosion material 30, the anticorrosion material 30 can be in close contact with the crimp terminal 20 and the wire coating material 12. Therefore, it is possible to prevent chloride ions and moisture that are the cause of corrosion from entering the contact interface between the anticorrosive material 30, the crimp terminal 20, and the wire coating material 12. As a result, corrosion at the connection portion between the wire connection portion 22 and the conductor 11 can be effectively prevented. In addition, in this specification, a main component means the 50 weight% or more component of the whole anticorrosion material.

  As a thermoplastic polyamide resin which comprises the anticorrosion material 30, it can obtain by making a dimer acid and a diamine compound react, for example. Specifically, the thermoplastic polyamide resin has thermoplasticity, has an amide bond (—NH—C (═O) —) in the repeating structure of the polymer main chain, and further has a peel adhesion strength described later. Various things can be used if the conditions are satisfied.

  Specific examples of the thermoplastic polyamide resin used in the present embodiment include, for example, polyamide 6, polyamide 6,6, polyamide 4,6, polyamide 11, polyamide 12, polyamide 6,10, polyamide 6,12, polyamide. 6 / 6,6, polyamide 6 / 6,12 aliphatic polyamides, and mixtures thereof.

  The method for producing the polyamide resin used in the present embodiment is not particularly limited, and examples thereof include ring-opening polymerization of lactams, polycondensation of diamine and dicarboxylic acid, and polycondensation of aminocarboxylic acid. . Examples of other production methods include a method in which lactams, diamines, and / or dicarboxylic acids are polymerized in a polymerization reactor to a low molecular weight oligomer stage, and then further polymerized to obtain a polyamide by an extruder or the like.

  Examples of lactams include ε-caprolactam, enantolactam, and ω-laurolactam.

  Examples of diamines include aliphatic diamines, alicyclic diamines, and aromatic diamines. Specific examples thereof include tetramethylenediamine, hexamethylenediamine, undecamethylenediamine, dodecamethylenediamine, tridecamethylenediamine, 1,9-nonamethylenediamine, 2-methyl-1,8-octamethylenediamine, 2, 2,4-trimethylhexamethylenediamine, 2,4,4-trimethylhexamethylenediamine, 5-methylnonamethylenediamine, 1,3-bisaminomethylcyclohexane, 1,4-bisaminomethylcyclohexane, m-phenylenediamine, Examples include p-phenylenediamine, m-xylylenediamine, and p-xylylenediamine.

  Dicarboxylic acids include aliphatic dicarboxylic acids, alicyclic dicarboxylic acids, and aromatic dicarboxylic acids. Specific examples include adipic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, 1,1,3-tridecanedioic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, terephthalic acid. , Isophthalic acid, naphthalenedicarboxylic acid, and dimer acid.

  In addition, the anticorrosion material 30 may be comprised with the single thermoplastic polyamide resin, and the 2 or more types of thermoplastic polyamide resin may be mixed. Furthermore, additives, other polymers, etc. may be mixed as long as the physical properties are not impaired. The additive is not particularly limited as long as it is generally used for resin molding materials. Specific examples include inorganic fillers, antioxidants, metal deactivators, ultraviolet absorbers, flame retardant aids, processing aids (such as lubricants and waxes), carbon, and other coloring pigments. it can.

  Furthermore, in order to prevent the entry of chloride ions and moisture as corrosion-causing substances, the anti-corrosion material 30 and the terminal material of the crimp terminal 20 have a peel adhesion strength of 0.1 N / mm or more. It is necessary that the peel adhesive strength with 12 be 0.5 N / mm or more. Here, “peeling adhesive strength” in the present specification is determined by the measurement method defined in Japanese Industrial Standard JIS K6854-3 (Adhesive—Peeling peel strength test method—Part 3: T-type peel). Value. The above-mentioned material is used as a main component as the anticorrosion material 30, and the terminal material of the crimp terminal 20 and the peel adhesion strength between the wire coating material 12 and the anticorrosion material 30 are equal to or higher than the above values. High adhesion at the contact interface between the material 12 and the anticorrosion material 30 is obtained. As a result, it is possible to sufficiently ensure the sealing property at the contact interface, and to prevent the entry of the corrosion-causing substance.

  Further, from the viewpoint of further improving the sealing performance between the anticorrosive material 30 and the crimp terminal 20, the peel adhesion strength between the anticorrosive material 30 and the terminal material of the crimp terminal 20 is preferably 0.2 N / mm or more. From the same viewpoint, the peel adhesion strength between the anticorrosion material 30 and the wire covering material 12 is preferably 2.0 N / mm or more.

  However, the peel adhesion strength between the anticorrosion material 30 and the terminal material of the crimp terminal 20 is preferably 0.74 N / mm or less. When the peel adhesion strength between the anticorrosion material 30 and the terminal material of the crimp terminal 20 exceeds 0.74 N / mm, the adhesion at the contact interface between the crimp terminal 20 and the anticorrosion material 30 is high, and thus high corrosion resistance is obtained. Can do. However, the higher the adhesion between the anticorrosive 30 and the crimp terminal 20, the higher the adhesion between the anticorrosive 30 and the injection mold. Therefore, after the injection molding, the anticorrosion material 30 is firmly bonded to the mold, and it becomes difficult to release the mold, resulting in a decrease in productivity.

  Therefore, from the viewpoint of improving the releasability from the mold while ensuring high adhesion at the contact interface between the crimp terminal 20 and the anticorrosion material 30, the peel adhesion strength between the anticorrosion material 30 and the terminal material of the crimp terminal 20 is high. The thickness is preferably 0.1 N / mm or more and 0.74 N / mm or less. In addition, from the viewpoint of further improving the releasability from the mold, the peel adhesion strength between the anticorrosive material 30 and the terminal material of the crimp terminal 20 is more preferably 0.50 N / mm or less.

  The upper limit of the peel adhesion strength between the anticorrosion material 30 and the wire covering material 12 is not particularly limited. However, when the strength of the wire covering material 12 is lower than the peel adhesion strength between the anticorrosive material 30 and the wire covering material 12, the wire covering material 12 may be damaged and the conductor 11 may be exposed. Therefore, the peel adhesion strength between the anticorrosion material 30 and the wire coating material 12 is preferably lower than the strength of the wire coating material 12.

  Furthermore, in order to improve the durability of the anticorrosion material 30 in a low temperature environment, the embrittlement temperature of the anticorrosion material 30 needs to be 0 ° C. or less. Here, “embrittlement temperature” in the present specification is a value obtained by a measurement method specified in Japanese Industrial Standard JIS K7216 (Plastic embrittlement temperature test method). When the embrittlement temperature of the anticorrosive material exceeds 0 ° C., a crack occurs in the anticorrosive material, and a corrosion-causing substance enters from the crack, so that the connection portion between the crimp terminal 20 and the conductor 11 is easily corroded. In addition, it is preferable that the embrittlement temperature of the anticorrosion material 30 is -20 degrees C or less from a viewpoint of suppressing generation | occurrence | production of a crack more.

  Moreover, in order to make the moldability of the anticorrosive material 30 good, it is necessary that the melt flow rate of the anticorrosive material is 26 g / 10 min or more. Here, the “melt flow rate” in the present specification is determined by a measurement method defined in the American Society for Testing and Materials standard ASTM D1238 (Standard Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plasmameter). The melt flow rate is measured at a measurement temperature of 230 ° C. and a load of 2.16 kg. When the melt flow rate of the anticorrosive material is less than 26 g / 10 min, the fluidity of the molten resin is lowered when the anticorrosive material is injection-molded, and there is a possibility that the molding may be defective and sufficient anticorrosion performance cannot be ensured. In addition, from the viewpoint of further improving the moldability of the anticorrosive material, the melt flow rate of the anticorrosive material is preferably 50 g / 10 min or more.

  Here, although the metal with high electroconductivity can be used as the material of the conductor 11 of the electric wire 10, for example, copper, copper alloy, aluminum, aluminum alloy, etc. can be used. Moreover, what plated the surface of the conductor 11 with tin can also be used. However, it is preferable to use lightweight aluminum or aluminum alloy as the conductor 11 from the viewpoint of reducing the weight of the wire harness in recent years.

  Moreover, as a material of the electric wire covering material 12 which covers the conductor 11, resin which can ensure electrical insulation can be used, for example, olefin resin can be used. Specifically, at least one of polyethylene (PE), polypropylene (PP), ethylene copolymer, and propylene copolymer can be the main component. Moreover, as a material of the electric wire covering material 12, polyvinyl chloride (PVC) can be made into a main component. Among these, the wire covering material 12 is preferably made of polypropylene or polyvinyl chloride. Since polypropylene and polyvinyl chloride have high adhesive strength with the thermoplastic polyamide resin, the adhesive strength of the contact interface between the wire covering material 12 and the anticorrosive material 30 can be increased. In addition, a main component here means the 50 weight% or more component of the whole electric wire coating | covering material.

  Furthermore, as the material (terminal material) of the crimp terminal 20, a metal having high conductivity can be used. For example, copper, copper alloy, stainless steel, tin-plated copper, tin-plated copper alloy, and tin-plating At least one of the stainless steel made can be used. Further, at least one of gold plated copper, copper alloy and stainless steel may be used, and at least one of silver plated copper, copper alloy and stainless steel may be used. Among these, it is preferable to use copper, copper alloy and stainless steel whose surface is plated with tin. Since the thermoplastic polyamide resin has high adhesive strength with tin, the adhesive strength at the contact interface between the crimp terminal 20 and the anticorrosive material 30 can be increased.

  Here, as shown in FIG. 2, the thickness t of the anticorrosion material 30 when integrally formed around the connection portion between the conductor 11 and the crimp terminal 20 and around the wire covering material 12 adjacent to the connection portion. Is preferably at least 0.01 mm. When sufficient sealing performance between the crimp terminal 20 and the wire covering material 12 and the anticorrosion material 30 can be ensured, the thickness of the anticorrosion material 30 may be less than 0.01 mm. However, when the thickness t of the thinnest part of the anticorrosion material 30 is 0.01 mm or more, sufficient strength against the internal pressure of the anticorrosion material 30 can be ensured. Therefore, it is possible to suppress the entry of the causative substance over a long period of time and prevent corrosion at the connection portion between the conductor 11 and the crimp terminal 20.

  Thus, in the electric wire with a terminal according to the present embodiment, the anticorrosion material is integrally formed around the connection portion between the conductor and the crimp terminal and around the wire covering material adjacent to the connection portion. Furthermore, the anticorrosive material has a thermoplastic polyamide resin as a main component. Further, the peel adhesion strength between the anticorrosion material and the terminal material of the crimp terminal is 0.1 to 0.74 N / mm, and the peel adhesion strength between the corrosion protection material and the wire coating material is 0.5 N / mm or more. . Furthermore, the embrittlement temperature of the anticorrosive material is 0 ° C. or lower, and the melt flow rate of the anticorrosive material is 26 g / 10 min or higher. Thereby, since it can prevent that a corrosion causative substance permeates from the contact interface of a corrosion-proof material, a crimp terminal, and a wire coating material, it can prevent the corrosion in the connection part of a conductor and a crimp terminal for a long term. . Moreover, since the material and adhesiveness of the anticorrosion material are controlled and the release property from the mold after injection molding is improved, higher productivity than the conventional one can be obtained. In addition, it is possible to ensure high formability while suppressing the occurrence of cracks in the anticorrosive material.

[Method of manufacturing electric wire with terminal]
Next, the manufacturing method of the electric wire with a terminal of this embodiment is explained. First, as shown in FIGS. 3 and 4, the terminal-attached electric wire 1 inserts the terminal portion of the electric wire 10 into the electric wire connecting portion 22 of the crimp terminal 20. As a result, the conductor 11 of the electric wire 10 is placed on the upper surface of the bottom plate portion 26 of the conductor crimping portion 24, and the portion of the electric wire 10 with the electric wire covering material 12 attached to the upper surface of the bottom plate portion 28 of the covering material crimping portion 25. Place. Then, the conductor 11 is crimped so as to be in close contact with the upper surface of the bottom plate portion 26 by bending the pair of conductor crimping pieces 27 of the conductor crimping portion 24 inward. Further, by bending the pair of covering material crimping pieces 29 of the covering material crimping portion 25 inward, the wire coating material 12 is crimped so as to be in close contact with the upper surface of the bottom plate portion 28. Thereby, the crimp terminal 20 and the electric wire 10 can be connected.

  Next, the connection portion between the crimp terminal 20 and the electric wire 10 is placed on a mold. Thereafter, the mold is filled with the resin of the anticorrosive material heated and melted, and the molten resin of the anticorrosive material is solidified by cooling the mold. And the electric wire with a terminal by which the connection part of the crimp terminal 20 and the electric wire 10 was coat | covered with the anticorrosion material 30 can be obtained by taking out from a metal mold | die. That is, the anticorrosion material 30 can be formed by placing the connecting portion of the crimp terminal 20 and the electric wire 10 on a mold and performing injection molding.

  Thus, the electric wire with a terminal of this embodiment forms the anticorrosive material by injection molding. Therefore, since the shape and thickness of the anticorrosion material are stabilized, it is possible to ensure sufficient strength even if the thickness of the anticorrosion material is thin. Moreover, since the thickness of the anticorrosive material can be reduced, it is not necessary to change the pitch dimension of the connector described later, and therefore the electric wire with terminal of the present embodiment can be inserted into a connector of a conventional size. Therefore, it is not necessary to change the design of the connector for the electric wire with terminal according to the present embodiment.

[Wire Harness]
The wire harness of this embodiment includes the above-described electric wire with a terminal. Specifically, the wire harness 2 of this embodiment is provided with the connector 40 and the above-mentioned electric wire 1 with a terminal, as shown in FIG.

  On the surface side of the connector 40, a plurality of mating terminal mounting portions (not shown) on which mating terminals (not shown) are mounted are provided. A plurality of cavities 41 are provided on the back side of the connector 40. Each cavity 41 is provided with a substantially rectangular opening so that the crimp terminal 20 and the anticorrosion material 30 in the terminal-attached electric wire 1 are respectively attached. Furthermore, the opening of each cavity 41 is formed slightly larger than the cross section of the crimp terminal 20 and the anticorrosion material 30. Then, the crimp terminal 20 is attached to the connector 40, and the electric wire 10 is pulled out from the back side of the connector 40.

  Thus, the terminal-attached electric wire of this embodiment has a peel adhesion strength between the anticorrosive material and the terminal material of the crimp terminal of 0.1 N / mm or more, and a peel adhesion strength between the anticorrosive material and the wire coating material. It is 0.5 N / mm or more. Therefore, it is possible to prevent the corrosion-causing substance from entering from the contact interface between the anticorrosive material, the crimp terminal, and the wire coating material. Therefore, even when the conductor of the electric wire and the crimp terminal are made of different metal materials, corrosion at the connection portion between the conductor and the crimp terminal can be prevented over a long period of time.

  Furthermore, the peel adhesion strength between the anticorrosive material and the terminal material of the crimp terminal is 0.74 N / mm or less. Thereby, it becomes possible to improve the mold release property of the anticorrosive material from the mold.

  Moreover, the anticorrosion material provided in the connection part of an electric wire and a crimp terminal is requested | required that it can follow the change of the electric wire derived | led-out from a connector flexibly while ensuring anticorrosion performance. And since the electric wire with a terminal of this embodiment has as a main component the thermoplastic polyamide resin excellent in the softness as a main component, even if an electric wire fluctuates, it is hard to produce a crack and corrosion is suppressed over a long term.

  Furthermore, the anticorrosive material according to this embodiment is characterized in that the melt flow rate is 26 g / 10 min or more. If the fluidity of the resin that constitutes the anticorrosive material is low, the moldability deteriorates, so the anticorrosive material must be enlarged. In this case, the external dimensions of the anticorrosive material increase the dimensions of the crimp terminal and the outer diameter of the wire. It will exceed. For this reason, when the crimp terminal is accommodated in the connector, the anticorrosive material may not be inserted into the cavity. If it does so, the opening dimension of a cavity must be enlarged and there exists a possibility that the existing connector cannot be used. However, in this embodiment, since resin with high fluidity is used as the anticorrosive material, the moldability is improved, and the outer dimensions of the anticorrosive material can be minimized. As a result, it is possible to obtain a terminal-attached electric wire that can be inserted into an existing connector while ensuring high corrosion resistance.

  In addition, the anticorrosive material according to this embodiment is characterized in that the embrittlement temperature is 0 ° C. or lower. Since the electric wire with a terminal of this embodiment is mainly used for a vehicle, the anticorrosion material is required to have impact resistance. However, when the embrittlement temperature exceeds 0 ° C., sufficient impact resistance may not be obtained unless the anticorrosive material is made thick. Further, when the anticorrosion material is made thick, the opening size of the connector cavity must be increased, and the existing connector cannot be used. However, since the anticorrosive material of this embodiment has an embrittlement temperature of 0 ° C. or less, high impact resistance can be obtained even when the thickness is reduced.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to these Examples.

[Examples 1 and 2]
In Examples 1 and 2, first, the resins shown in Table 1 were prepared as the anticorrosive resin. In addition, what used aluminum as a conductor and polyvinyl chloride (PVC) as an electric wire coating material was prepared as an electric wire. Furthermore, what used tin-plated copper as a terminal material was prepared as a crimp terminal.

  Next, the electric wire and the crimp terminal were connected, and then the connection portion between the crimp terminal and the electric wire was placed on the mold. Furthermore, the resin of the anticorrosive material of each Example which was heated and melted inside the mold was filled, and the melted resin was solidified by cooling the mold. And the electric wire with a terminal of each Example was obtained by taking out from a metal mold | die. Table 1 shows the peel adhesion strength between the anticorrosive material used in each example and the terminal material (Sn) of the crimp terminal, and the peel adhesion strength between the corrosion preventive material and the wire covering material (PVC).

[Comparative Examples 1 and 2]
In Comparative Examples 1 and 2, a terminal-attached electric wire of each comparative example was obtained in the same manner as in Examples 1 and 2 except that the materials shown in Table 1 were used as the material of the anticorrosive material.

[Anti-corrosion performance evaluation]
The anticorrosion performance of Examples 1 and 2 and Comparative Examples 1 and 2 was evaluated based on the measurement method defined in Japanese Industrial Standard JIS C60068-2-11 (environmental test method (electrical / electronic) salt spray test method). . That is, the salt spray test was done to the connection part of the conductor of the electric wire with a terminal of each example, and a crimp terminal. More specifically, the test was conducted under the conditions of a temperature of 35 ± 2 ° C., a relative humidity (RH) of 85% or more, a salt water concentration of 5 ± 1%, and an implementation period of 4 days. Thereafter, it was visually determined whether or not rust was generated at the connecting portions in each example. In addition, the thing in which rust was not recognized was evaluated as "(circle)", the thing in which rust was recognized was evaluated as "*", and the evaluation result of each example was combined with Table 2, and was shown.

[Crack evaluation]
About the test piece after performing the said anti-corrosion performance evaluation, it was determined visually whether the crack had generate | occur | produced. And the thing in which the crack was not recognized was evaluated as "(circle)", the thing in which the crack was recognized was evaluated as "*", and the evaluation result of each example was shown in Table 2.

[Evaluation of mold releasability]
As a mold, an injection mold in which a base film and an amorphous fluororesin film with a uniform thickness were provided on the base film was prepared. And the anticorrosion material was injection-molded using this metal mold | die, and the mold release test was done. Specifically, when releasing the runner and spool formed with the terminal-formed electric wire and the terminal-equipped electric wire from the mold, the number of successful mold release is evaluated as a mold releasability evaluation method. It was. Molding was carried out 100 times each, and the number of releasable acceptable products in which the electric wire with terminal, the runner and the spool were not damaged or deformed is shown in Table 2.

  As shown in Table 1 and Table 2, the terminal-attached electric wires of Examples 1 and 2 according to the present embodiment did not show rust and cracks after the anticorrosion evaluation test. Therefore, it can be seen that the adhesion strength between the crimp terminal and the wire coating material and the anticorrosion material is high, and the anticorrosion performance is excellent. In Examples 1 and 2, breakage and deformation did not occur when releasing from the mold, and the release property was good.

  On the other hand, in Comparative Examples 1 and 2, although the anticorrosion performance was excellent, the peel adhesion strength was too high, and thus the release property was inferior. That is, in Comparative Example 1, the peel adhesion strength was 1.15 N / mm, so that the adhesive strength with the mold was too strong, and more than half were damaged during release. In Comparative Example 2, the peel adhesive strength was 0.75 N / mm, so that a product that was damaged upon release was produced.

  As mentioned above, although this invention was demonstrated by the Example, this invention is not limited to these, A various deformation | transformation is possible within the range of the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Electric wire with a terminal 2 Wire harness 10 Electric wire 11 Conductor 12 Electric wire coating material 20 Crimp terminal 30 Corrosion prevention material

Claims (4)

An electric wire having a conductor and an electric wire covering material covering the conductor;
A crimp terminal connected to the conductor of the wire;
An anticorrosion material integrally formed around the connection portion between the conductor and the crimp terminal, and around the wire covering material adjacent to the connection portion,
With
The anticorrosive material is mainly composed of a thermoplastic polyamide resin,
The peel adhesion strength between the anticorrosive material and the terminal material of the crimp terminal is 0.1 N / mm or more and 0.74 N / mm or less,
The peel adhesion strength between the anticorrosive material and the wire coating material is 0.5 N / mm or more,
The embrittlement temperature of the anticorrosive material is 0 ° C. or less,
An electric wire with a terminal, wherein a melt flow rate of the anticorrosive material is 26 g / 10 min or more. The conductor is made of aluminum or an aluminum alloy,
The terminal material of the crimp terminal comprises at least one of copper, copper alloy, stainless steel, tin-plated copper, tin-plated copper alloy, tin-plated stainless steel,
The said electric wire coating | covering material consists of at least one of polyethylene, a polypropylene, an ethylene copolymer, a propylene copolymer, and a polyvinyl chloride, The electric wire with a terminal of Claim 1 characterized by the above-mentioned.   A wire harness comprising the terminal-attached electric wire according to claim 1. Connecting an electric wire having a conductor and a wire covering material covering the conductor, and a crimp terminal connected to the conductor of the electric wire;
Forming an anticorrosive material by injection molding around the connection portion between the conductor and the crimp terminal and around the wire covering material adjacent to the connection portion;
Have
The anticorrosive material is mainly composed of a thermoplastic polyamide resin,
The peel adhesion strength between the anticorrosive material and the terminal material of the crimp terminal is 0.1 N / mm or more and 0.74 N / mm or less,
The peel adhesion strength between the anticorrosive material and the wire coating material is 0.5 N / mm or more,
The embrittlement temperature of the anticorrosive material is 0 ° C. or less,
The melt flow rate of the anticorrosive material is 26 g / 10 min or more.

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