JP6034029B2 - Connection structure - Google Patents

Description

  The present invention relates to, for example, a connection structure as an electric wire with a connection terminal that is attached to a connector or the like for connecting an automobile wire harness. For example, a wire harness made of an aluminum-based conductor and an aluminum-based material are made of different materials. The present invention relates to a connection structure in which connection terminals are connected.

  In the fields of automobiles, office automation equipment, and home appliances, copper wires having a core wire made of a copper-based material having excellent conductivity have been used as signal lines and power lines. In particular, in the automobile field, since the high performance and high functionality of vehicles are being promoted rapidly, the amount of electric wires used tends to increase with the increase in various on-vehicle electric devices and control devices. There is the present situation.

  On the other hand, demands for improving fuel efficiency by reducing the weight of vehicles are rapidly increasing, and aluminum wires that are lighter than copper wires are attracting particular attention in the automotive field.

However, when aluminum wires are actually used for automobiles, there arises a problem that electrolytic corrosion such as contact corrosion of different metals occurs.
For example, when the metal material constituting each of the terminal of the external electrical device and the conductor of the electric wire is a different metal material, the insulating coating on the tip side is peeled off and exposed in the coated electric wire covering the conductor with the insulating coating. When the tip of the wire is connected to a connection terminal composed of a metal material different from the conductor of the wire, and connected to the terminal of the external electrical device via the connection terminal, the connection portion is eroded due to the presence of water or moisture. There's a problem.

  In this case, when the connection part of different metals gets wet by running, car washing, or condensation in rainy weather, ionization of the aluminum base terminal which is electrically base proceeds and corrosion is promoted. As a result, the contact state of the terminal part deteriorates and the electrical characteristics become unstable, the electrical resistance increases due to the increase in contact resistance and the wire diameter decreases due to corrosion, and further the disconnection causes malfunction of the electrical components, It is also possible to stop functioning.

  In particular, when aluminum-based terminals and copper-based terminals are connected among different types of metal terminals, the difference in standard electrode potential between the terminals increases, so that electric corrosion tends to occur.

As a conventional method for preventing such electric corrosion, Patent Document 1 below proposes an aluminum wire terminal.
In the terminal for an aluminum electric wire in Patent Document 1, the terminal rear end portion is formed of an aluminum-based material, the terminal tip end portion is formed of a copper-based material, the terminal rear end portion and the terminal tip end portion are joined, It is the connection terminal comprised by sealing a part with an insulator.

  According to Patent Document 1, with such a configuration, an aluminum electric wire is connected to a terminal rear end portion formed of an aluminum-based material, and a copper terminal of a connection counterpart is connected to a terminal tip portion formed of a copper-based material. In addition, it is disclosed that, by resin-sealing the connecting portion between the terminal front end portion and the terminal rear end portion, water corrosion does not adhere to the connecting portion and electrolytic corrosion can be prevented.

However, the aluminum wire terminal in Patent Document 1 has the following problems.
In the case of a configuration in which the connection portion between the terminal front end portion and the terminal rear end portion is sealed (molded) with resin as in the case of the aluminum electric wire terminal in Patent Document 1, when sealing the connection portion with resin, resin is used. Due to variations in the amount of application applied to the connection portion, the resin may be sealed to the connection portion in a manner that protrudes from an orthogonal cross section orthogonal to the longitudinal direction of the aluminum wire terminal.

Then, when inserting the aluminum wire terminal into the insertion hole provided in the connection counterpart terminal, it is not possible to insert the aluminum wire terminal, or even if it can be inserted, provided on the back side of the insertion hole, There has been a problem that the aluminum wire terminal cannot be completely inserted into the insertion hole without being engaged with the engagement stopper that allows the engagement of the aluminum wire terminal.
In order to avoid such a situation, when the application amount of the resin to be sealed to the connection portion is suppressed, there is a problem that water enters the connection portion and electric corrosion cannot be prevented. .

  As described above, in order to suppress variation in the amount of resin applied to the connection portion, applying with high accuracy while adjusting the amount of application causes a problem that the manufacturing cost increases in terms of time and equipment.

  In addition, in the case where a resin is used for the connection portion, there is a problem that it takes time and effort to manage the resin so as not to deteriorate.

JP 2004-111058 A

  Therefore, an object of the present invention is to provide a connection structure and a manufacturing method of the connection structure that suppress corrosion such as dissimilar metal contact corrosion that occurs between different metals and have stable electrical characteristics over time.

This invention, conductor made of wires of the plurality book consists covered with an insulating coating Rutotomoni, wire tip having a conductive tip the insulating coating on the distal end side is removed of the conductor on the distal end side composed of a covered electric wire provided, Rutotomoni formed of a metal from the noble metal constituting the conductor, the connecting terminal wire connection allowance portion is provided with said conductor connection permission unit conductor tip Ru is connected In the connection structure, in the connection terminal, a transition is provided in front of the conductor connection permission portion of the wire connection permission portion, and at the wire tip portion, at least with respect to the conductor connection permission portion. conductor guide means is provided to the wire with respect to a predetermined arrangement position placing the conductor exposed portion where the conductive tip is exposed for guiding the conductor exposed portion so as not to disperse, before The conductor guide means includes an exposed conductor support that guides the tip of the conductor tip at the bottom of the transition, and the exposed conductor support includes a base projecting upward with respect to the bottom of the transition, The bottom surface for placing the exposed conductor portion with respect to the base and a support projecting piece protruding substantially horizontally, the conductor exposed to the exposed conductor portion at the end of the conductor guided by the exposed conductor support portion. wherein the melting fixing portion which is fixed to each other the wires of the plurality of is melted to integrate the structure is formed.

The present invention, conductor made of wires of the plurality book consists covered with an insulating coating Rutotomoni, wire tip provided on the distal end side having the conductor tip insulating coating has been removed on the front end side of the conductor a covered electric wire is, the conductor is composed of a metal nobler than the metal constituting the Rutotomoni, wire connection permitting portion where the conductor tip has a conductor connection allowing portion that will be connected is constituted by a connection terminal provided In the connection terminal, in the connection terminal, a first transition is provided in front of the conductor connection permission portion of the wire connection permission portion, and a second transition is provided in the rear, and at least at the wire tip portion, Guide the exposed conductor portion so that the wire does not disperse at a predetermined location where the exposed conductor portion where the conductor tip is exposed with respect to the conductor connection allowable portion is disposed. Conductor guide means is provided for the conductor guide means includes a first transition and, formed in the second transition, configuration laterally guide pieces for guiding laterally the exposed conductor portion disposed in the conductor connection permission unit The conductor exposed portion guided by the conductor guide means is formed with a fusion fixing portion in which a plurality of the strands constituting the conductor are melted so as to be integrated and fixed to each other. And

  As described above, since the exposed conductor portion is exposed without being covered with the conductor connection allowing portion, the electrolytic solution easily adheres to the exposed conductor portion. By forming the portion, it is possible to integrate each of the plurality of strands constituting the conductor, and to reduce the surface area of the exposed conductor portion.

  Furthermore, by forming the melt-adhered portion in the exposed conductor portion where the electrolytic solution easily adheres, the gap where the electrolytic solution enters can be blocked through the gap between the plurality of strands.

  Thereby, it is possible to greatly suppress the occurrence of contact corrosion of dissimilar metals (hereinafter referred to as “electric corrosion”) due to the electrolytic solution interposing between the conductor made of the dissimilar metal and the connection terminal.

  Furthermore, the surface of the wire connection portion can be suppressed because the conductor exposed portion can be prevented from contacting the connection terminal without sealing the surface of the wire connection portion connected to the wire tip with the wire connection allowance portion with resin. Defects caused by sealing with resin can be prevented.

  Specifically, unlike the configuration in which the surface of the wire connection portion is sealed with resin, the resin does not become bulky in the width direction or height direction of the connection terminal, so the resin provided in the connection terminal is attached to the housing for the connection terminal. There is no interference when inserting.

  Also, when connecting the connection terminal and the connection partner terminal, the resin provided in the connection terminal does not interfere with the housing of the connection partner terminal, and the connection terminal is smoothly inserted into the connection partner terminal for connection. can do.

  Furthermore, when the insertion of the connection terminal into the connection counterpart terminal is completed, the connection terminal can be securely connected to the engagement piece provided on the connection counterpart terminal side without being hindered by the resin provided in the connection terminal. Can be engaged.

  Therefore, it is possible to maintain the state where the connection terminal inserted into the connection counterpart terminal is firmly inserted to the insertion completion depth without unexpectedly coming out of the connection counterpart terminal.

  Further, by forming conductor guide means on the connection terminal so as to guide the conductor exposed portion so that the strands are not dispersed with respect to a predetermined arrangement position where the conductor exposed portion is arranged in the connection terminal, The conductor exposed portion can be guided by the conductor guide means so that the conductor exposed portion is arranged at a predetermined arrangement location.

  Thereby, when forming the melt-fixed portion on the conductor exposed portion, when applying heat for melting the conductor exposed portion, all the plurality of strands constituting the conductor exposed portion are free from spots. Heat can be applied.

  Therefore, the electrolytic corrosion of the exposed conductor portion can be further suppressed by efficiently and reliably forming the melt-fixed portion with respect to the exposed conductor portion.

  Here, the conductor guide means is not limited to a configuration in which the conductor exposed portion is guided by the conductor guide means in the width direction of the wire connection allowance portion, for example, the conductor exposure with respect to the bottom surface of the wire connection allowance portion. The structure may be such that the portion is guided so as to be held at a predetermined height, and the guiding direction and position are not particularly limited.

  The conductor guide means is not limited to guide by simply contacting the conductor exposed portion, but may be guided in a state where the conductor exposed portion is held by being crimped.

Further, as an aspect of the present invention, a conductor connection portion in which the conductor tip portion is connected to the conductor connection allowance portion is provided, and the conductor exposed portion is further to the conductor connection allowance portion on the tip side than the conductor connection portion. provided with a distal end side conductor exposed portion where the conductive tip is exposed, the melting fixation portion may be formed on the distal end side conductor exposed portion.

  According to the above configuration, the conductor is likely to be exposed from the leading end side of the conductor with respect to the conductor connection allowing portion in a state of being connected to the conductor connection allowing portion. By forming the melt-fixed portion, it is possible to effectively prevent the electrolytic corrosion of the exposed portion of the conductor.

  In addition, by forming the melting and fixing portion in the tip-side conductor exposed portion, the electrolyte enters the conductor portion connected by the conductor connection allowing portion through the gaps of the plurality of strands in the tip-side conductor exposed portion. It is possible to prevent the electrolytic corrosion from spreading to the conductor portion through the conductor exposed portion.

In an embodiment of the present invention, it may be resin layer is formed on the surface of the conductor connection section.

  As described above, since the fusion-bonded portion is formed in the conductor exposed portion, even when a resin layer is formed on the surface of the conductor connection portion, the thickness of the resin layer is reduced. However, the electric corrosion of the conductor can be securely prevented.

  Therefore, by forming a resin layer on the surface of the conductor connecting portion, it is possible to further prevent electrical corrosion of the conductor and to reduce the amount of resin sealing. It can be smoothly inserted into the side connection terminal and firmly inserted.

  In addition, the present invention is configured by covering a conductor composed of a plurality of strands with an insulation coating, and further including a wire tip portion having a conductor tip portion from which the insulation coating on the tip side of the conductor is removed on the tip side. A connection structure composed of a covered electric wire and a connection terminal having a wire connection allowance portion having a conductor connection allowance portion that allows connection of the conductor tip portion while being made of a metal that is nobler than the metal constituting the conductor In the wire tip portion, at least a conductor exposed portion where the conductor tip portion is exposed with respect to the conductor connection allowing portion is melted so that a plurality of the strands constituting the conductor are integrated. A melt-adhered portion fixed to each other is formed, a transition is provided in front of the conductor connection allowable portion of the wire connection allowable portion, and the conductor exposed portion is disposed in the connection terminal. Conductor guide means for guiding the exposed conductor portion is formed so as not to disperse the wire to a predetermined arrangement position, and the conductor guide means guides the tip end portion of the conductor tip at the bottom of the transition. It is characterized by comprising a conductor tip guide protruding piece protruding upward.

  Further, as an aspect of the present invention, the conductor connection allowance portion is formed by a conductor crimping allowance portion that crimps and connects the conductor tip end portion, and the conductor guide means is located on the tip end side of the conductor crimping allowance portion in the connection terminal. In addition, it is possible to configure a conductor guide crimping allowable portion that guides the tip-side conductor exposed portion in a crimped state.

  As described above, when the conductor connection allowing portion is constituted by the conductor crimping allowing portion, the conductor can be firmly crimped and connected by a strong crimping force by the conductor crimping allowing portion. However, on the other hand, the strong crimping force by the conductor crimping allowable portion may cause a plurality of strands constituting the tip-side conductor exposed portion where the conductor is exposed to the conductor crimping allowable portion to be dispersed.

  Accordingly, the conductor tip end portion is crimped and connected by the conductor crimping allowable portion, and the tip end conductor exposed portion is crimped and connected by the conductor guide crimping allowable portion, thereby forming a plurality of elements constituting the tip end conductor exposed portion. It is possible to guide it while holding it firmly so that the lines do not disperse.

  As described above, since the fusion-bonding portion can be formed without unevenness by forming the fusion-bonding portion with respect to the exposed end portion of the conductor in the state guided by the conductor guide crimping allowable portion, the dissimilar metal It is possible to further suppress the occurrence of electrolytic corrosion due to the presence of the electrolytic solution between the conductor constituted by and the connection terminal.

  Further, as an aspect of the present invention, between the conductor crimping allowance part and the conductor guide crimping allowance part, the irradiation of the laser that melts the conductor to the conductor exposed part from which the conductor tip is exposed Can be formed.

  As described above, by forming the laser irradiation permission portion between the conductor crimping permission portion and the conductor guide crimping permission portion, the conductor crimping permission portion and the conductor guide crimping permission portion are separated from each other. It can be in the form.

  Then, the conductor guide crimping allowable portion can crimp-connect the tip side conductor exposed portion independently of the conductor crimping allowable portion, and thus the conductor crimping allowable portion and the conductor guide crimping allowable portion are continuously connected. As in the case where the conductor crimping allowable part and the conductor guide crimping allowable part are formed integrally, the conductor crimping allowable part is free from deformation such as distortion due to the biasing force being biased in one of the conductor guide crimping allowable part and the conductor guide crimping allowable part. The conductor can be firmly crimped by each of the conductor guide crimping allowable portions.

  In addition, by forming the laser irradiation allowable portion between the conductor pressure bonding allowable portion and the conductor guide pressure bonding allowable portion, a laser is irradiated to the conductor exposed portion exposed from the laser irradiation allowable portion. Thus, the melt-fixed portion can be formed on the conductor exposed portion.

  Accordingly, it is possible to reliably prevent the exposed portion of the conductor exposed from the laser irradiation allowable portion from being electrolytically eroded and the electrolyte from entering the gap between the strands through the exposed portion of the conductor.

  In addition, the present invention is configured by covering a conductor composed of a plurality of strands with an insulating coating, and further including an electric wire distal end portion on the distal end side having a conductor distal end portion from which the insulating coating on the distal end side of the conductor is removed. A connection structure composed of a covered electric wire and a connection terminal having a wire connection allowance portion having a conductor connection allowance portion that allows connection of the conductor tip portion while being made of a metal that is nobler than the metal constituting the conductor In the manufacturing method of the above, a plurality of the strands are fixed to each other by irradiating at least the conductor exposed portion where the conductor tip is exposed with respect to the conductor connection allowable portion at the wire tip. Until the conductor is melted.

  As described above, by melting the conductor by laser irradiation, for example, it is possible to accurately focus on a desired portion as compared with the case where the conductor is melted using other heating means such as a burner. High heat can be imparted.

  Therefore, since the entire exposed conductor portion can be accurately and efficiently melted to reduce the surface area, electrolytic corrosion can be further suppressed.

  According to the present invention, it is possible to provide a connection structure and a method for manufacturing the connection structure, which have electric characteristics that are stable over time by suppressing electrolytic corrosion that occurs between different metals.

Structure explanatory drawing of the electric wire with a crimp terminal of a 1st embodiment. Structure explanatory drawing of the electric wire with a crimp terminal of a 1st embodiment. Explanatory drawing which shows a part of manufacturing process of the electric wire with a crimp terminal of 1st Embodiment. Structure explanatory drawing of the electric wire with a crimp terminal of a 2nd embodiment. Structure explanatory drawing of the electric wire with a crimp terminal of 3rd Embodiment. Structure explanatory drawing of the electric wire with a crimp terminal of 4th Embodiment. Structure explanatory drawing of the electric wire with a crimp terminal of 5th Embodiment. Structure explanatory drawing of the electric wire with a crimp terminal of other embodiments. Structure explanatory drawing of the electric wire with a crimp terminal of other embodiments.

An embodiment of the present invention will be described below with reference to the drawings.
(First embodiment)
As shown in FIG. 1 and FIG. 2, the electric wire 1 with a crimp terminal in the first embodiment includes a covered electric wire 100 and a crimp terminal 20 that is crimp-connected to the tip end portion of the covered electric wire 100.

  Fig.1 (a) is an external view which shows a part of crimp terminal part of the electric wire 1 with a crimp terminal of this embodiment, FIG.1 (b) shows the crimp terminal 20 and electric wire front-end | tip part 100T in 1st Embodiment. FIG.

  FIG. 2A is a plan view showing a part of the crimp terminal portion of the electric wire with crimp terminal 1 of the present embodiment, and FIG. 2B is a cross-sectional view taken along the line AA in FIG. FIG. 2C is a longitudinal sectional view of the crimp terminal portion of the electric wire 1 with the crimp terminal cut at the middle portion in the width direction Y. FIG.

  As shown in FIG. 1 and FIG. 2, the covered electric wire 100 includes a conductor 101 composed of a plurality of aluminum strands 101 a (core wires) and an insulating resin. It is constituted by covering with an insulating coating 150 formed in the above.

  The wire tip portion 100T on the tip side of the covered wire 100 is composed of a conductor tip portion 101T from which the insulation coating 150 on the tip side of the covered wire 100 has been peeled off, and an insulation coating tip portion 150T on the tip side of the insulation coating 150. Yes.

  The crimp terminal 20 is a female terminal and is a metal that is nobler than the metal constituting the conductor 101. For example, a copper alloy strip is used as a metal substrate, and a metal substrate having a thickness of 0.25 mm and a width of 31 mm is subjected to bending processing. It is composed. As shown in FIG. 2C, the crimping terminal 20 is a crimping of a box portion 21 that allows insertion of a male terminal male tab (not shown) from the front to the rear in the longitudinal direction X, and the wire tip 100T. An electric wire crimping permissible portion 29 that permits connection according to is arranged in series.

  The box portion 21 is a female connection portion composed of an inverted hollow square column body, and includes a space 21A that allows insertion of a male terminal male tab therein, and contacts the male terminal male tab to be inserted. Contact piece 21a is provided.

  The wire crimping allowable portion 29 is arranged via a wire barrel portion 25 arranged via a first transition 22 provided behind the box portion 21 and a second transition 24 having a predetermined length behind the wire barrel portion 25. It is comprised with the insulation barrel part 23 made.

As shown in FIG. 1 (b), the wire barrel portion 25 before crimping is composed of a barrel bottom portion 25a and wire barrel pieces 25b extending obliquely outward and upward from both sides in the width direction Y. It is formed in a U shape. The insulation barrel part 23 before press-bonding is also composed of a barrel bottom part 23a and an insulation barrel piece 23b extending obliquely outward from both sides in the width direction Y, and is formed in a substantially U shape in rear view.
The first transition 22 includes a transition bottom portion 22a and a transition protrusion piece 22b that protrudes upward on both sides in the width direction with respect to the transition bottom portion 22a. The second transition 24 includes a transition bottom portion 24a and a transition bottom portion 24a. , And a transition projecting piece 24b projecting upward on both sides in the width direction with respect to the transition bottom 24a.

  The electric wire 1 with a crimp terminal constitutes an electric wire crimping portion 10 in which an electric wire tip portion 100T is crimped to an electric wire crimping allowable portion 29 in the crimp terminal 20. The electric wire crimping portion 10 includes an insulating coating crimping portion 12 and a conductor crimping portion 11 in order from the rear side in the longitudinal direction X to the distal end side.

  The insulation coating crimping part 12 is a crimping part obtained by crimping the insulation coating tip 150T disposed on the barrel bottom 23a in the insulation barrel part 23 with the insulation barrel piece 23b.

The conductor crimping portion 11 is a crimped portion obtained by crimping the conductor tip portion 101T disposed on the barrel bottom portion 25b in the wire barrel portion 25 with the wire barrel piece 25b.
Moreover, the conductor exposed part 102 is suitably comprised in the peripheral part of the electric wire crimping | compression-bonding part 10. FIG. The conductor exposed portion 102 is a portion where the conductor tip portion 101T is exposed with respect to the insulation barrel portion 23, and includes a tip side conductor exposed portion 103 and a rear side conductor exposed portion 104.

As shown in FIG. 2, the tip-side conductor exposed portion 103 is a portion where the conductor 101 is exposed on the tip side with respect to the wire barrel portion 25, and the conductor-exposed portion arrangement portion 110 </ b> F in the transition bottom portion 22 a of the first transition 22. Has been placed.
The rear conductor exposed portion 104 is a portion where the conductor 101 is exposed on the rear side with respect to the wire barrel portion 25, and is disposed at the conductor exposed portion arrangement portion 110 </ b> R in the transition bottom portion 24 a of the second transition 24.

At least the tip-side conductor exposed portion 103 in the conductor exposed portion 102 is formed with a melt-fixed portion 107 in which a plurality of the strands 101 a are fixed to each other by melting the conductor 101 by the laser L.
The melted and fixed portion 107 is melted and fixed so that the plurality of strands 101a constituting the tip-side conductor exposed portion 103 are integrated in the tip-side conductor exposed portion 103, and is formed into an uneven shape by the plurality of strands 101a. The exposed part shows the part which became a smooth curved surface shape so that a surface area may become small.

  As shown in FIG. 2 (b), the melt-fixed portion 107 is formed on the entire surface of the tip-side conductor exposed portion 103 and melts to the extent that it reaches the bottom 22 a of the first transition 22. A gap between the bottom and the tip-side conductor exposed portion 103 is removed.

  Further, when forming the melt-fixed portion 107 on the tip-side conductor exposed portion 103, the YAG laser L generated by the laser oscillator is applied from the laser irradiation head 171 to the tip-side conductor exposed portion 103 as shown in FIG. By irradiating, as shown in FIGS. 3 (a1) and (b1) to FIGS. 3 (a2) and (b2), it is possible to form the melt-fixed portion 107 on the tip side conductor exposed portion 103, and the tip side The surface area of the conductor exposed portion 103 can be reduced.

  FIG. 3 is an explanatory view of a part of the manufacturing process of the electric wire 1 with a crimp terminal according to the present embodiment. Specifically, FIGS. 3 (a1) and 3 (b1) are respectively melted in the tip-side conductor exposed portion 103. 2A and 2B are a plan view and a longitudinal sectional view of a part of the crimp terminal portion in the middle of forming the fixing portion 107. FIGS. 2A2 and 2B2 illustrate the fusion fixing portion 107 on the tip-side conductor exposed portion 103. FIG. The top view and longitudinal cross-sectional view of a part of crimp terminal part in the state after formation are shown.

The electric wire 1 with a crimp terminal described above can obtain the following operations and effects.
In the state where the conductor tip portion 101T is crimped by the wire barrel portion 25, the tip side portion is exposed without being crimped to the wire barrel portion 25, but such a tip side conductor exposed portion 103 is exposed. On the other hand, by forming the melt-fixed portion 107, it is possible to effectively prevent the electrolytic corrosion of the tip-side conductor exposed portion 103.

Furthermore, by forming the melted and fixed portion 107 in the leading-end-side conductor exposed portion 103 where water easily adheres, the gap through which water enters through the gap between the plurality of strands 101a can be closed.
Thereby, it can suppress significantly that electrolytic corrosion generate | occur | produces by electrolyte solution interposing in the contact part of the conductor 101 and the crimp terminal 20 which were comprised with the dissimilar metal.

  Furthermore, since the conductor exposed portion 102 can be prevented from coming into contact with the connection terminal 20 without sealing the surface of the conductor crimping portion 11 including the tip side conductor exposed portion 103 with resin, the tip side conductor exposed portion It is possible to prevent adverse effects caused by sealing the surface of the conductor crimping part 11 including 103 with resin.

  Specifically, in order to prevent electrolytic corrosion when the surface of the conductor crimping portion 11 including the tip-side conductor exposed portion 103 is sealed with resin without forming the melt-fixed portion 107 on the tip-side conductor exposed portion 103. It is necessary to securely seal with resin. On the other hand, by sealing the surface of the conductor crimping portion 11 including the tip side conductor exposed portion 103 in which the fusion fixing portion 107 is formed with a resin, the connection terminal 20 becomes bulky in the width direction and the height direction by the resin. Therefore, the connection terminal 20 can be reliably mounted in the mounting hole of the housing for mounting the connection terminal.

  Moreover, according to the manufacturing method of the electric wire 1 with a crimp terminal, when forming the fusion fixing portion 107 at least at the distal end side conductor exposed portion 103 in the electric wire distal end portion 100T, the conductor 101 is melted by laser irradiation, for example, In addition, it is easy to adjust to a desired irradiation intensity using a laser oscillator or the like, and it is possible to accurately apply high heat by focusing on a desired portion as compared with other heating means such as a burner.

  Therefore, since the plurality of strands 101a constituting the conductor exposed portion 102 can be melted efficiently and the surface area of the conductor exposed portion 102 can be reduced, electric corrosion can be further suppressed. it can.

  In particular, by adopting a YAG laser as the laser L, the conductor 101 can be melted in a short irradiation time with high energy, so that it is possible to suppress deformation, distortion, and cracking due to thermal effects on the surface after melting. it can.

  That is, since there is almost no nest or the like in the melt-fixed portion 107 obtained by melting the conductor 101, the electrolytic solution does not enter through the melt-fixed portion 107, and excellent electric corrosion resistance can be obtained.

  Further, by adopting a YAG laser as the laser L, the laser L can be irradiated with an appropriate irradiation amount in a small irradiation range because it is particularly easy to focus and adjust the irradiation amount. In addition, many unmelted portions that are not melted remain, and conversely, the plurality of strands 101a are not melted and dispersed, and the entire exposed conductor 101 portion can be reliably melted. Further, it is possible to prevent the crimp terminal 20 from being damaged by accidentally irradiating the crimp terminal 20 with the laser L.

Subsequently, electric wires with crimp terminals 1A, 1A ′, 1B, 1C, 1D, 1E, 1F, and 1G in other embodiments will be described.
However, among the configurations of the crimped terminal-equipped electric wires 1A, 1A ′, 1B, 1C, 1D, 1E, 1F, and 1G described below, for the same configuration as the crimped terminal-equipped electric wire 1 in the first embodiment described above, The same reference numerals are given and description thereof is omitted.

(Second Embodiment)
The structure of the electric wire 1A with a crimp terminal in the second embodiment will be described with reference to FIGS. 4 (a) and 4 (b).
4A is an external view showing the crimp terminal 20A and the wire tip 100T in the second embodiment, and FIG. 4B is a crimp terminal of the crimp terminal-equipped electric wire 1A in the second embodiment. It is an external view of a part.

  As shown in FIG. 4A, the crimp terminal 20 </ b> A in the electric wire with crimp terminal 1 </ b> A according to the second embodiment has a conductor guide crimping allowable protrusion 27 on the distal end side of the wire barrel portion 25, and the distal end side of the wire barrel portion 25. Further, it is configured via a laser irradiation allowance portion 26.

  The conductor guide crimping allowable protrusion 27 is arranged such that the plurality of strands 101a constituting the tip-side conductor exposed portion 103 are not dispersed from the state in which the plurality of wires 101a are arranged at the tip-side exposed portion placement location 110F of the first transition 22. Is formed in a protruding piece shape on the outer side in the width direction on the distal end side of the wire barrel portion 25 so that it can be guided in a crimped state.

  Further, as shown in FIG. 4A, the laser irradiation allowable portion 26 is formed in a portion between the conductor guide crimping allowable protrusion 27 and the wire barrel portion 25 in the longitudinal direction, and the conductor guide pressure allowable protrusion. 27 and a concave shape recessed inward with respect to the wire barrel portion 25.

  As shown in FIG. 4B, a conductor guide crimping portion 161 is configured by crimping a part of the tip-side conductor exposed portion 103 with a conductor guide crimping allowable protrusion piece 27.

  At the same time, a part of the tip-side conductor exposed portion 103 is crimped by the conductor guide crimping allowable projecting piece 27, thereby allowing a pair of concave laser irradiation tolerances on both outer sides in the width direction as shown in FIG. The laser communication hole portion 180 can be formed between the conductor guide crimping portion 161 and the conductor crimping portion 11 by the portions 26 facing each other in the intermediate portion in the width direction.

  A part of the tip-side conductor exposed portion 103 is exposed through the laser communication hole portion 180. By irradiating the laser communication hole portion 180 with the laser L, the conductor portion exposed from the laser communication hole portion 180 is melted and fixed. A portion 107 is formed.

  With the above-described configuration, the crimp terminal-equipped electric wire 1 </ b> A can exhibit the following operational effects.

  According to the electric wire 1A with the crimp terminal described above, the tip-side conductor exposed portion 103 is configured by configuring the conductor guide crimp portion 161 in which a part of the tip-side conductor exposed portion 103 is crimped by the conductor guide crimp-tolerant protrusion 27. It is possible to guide (hold) the plurality of strands 101a to be dispersed.

  Thereby, when forming the fusion | melting fixation part 107 in the front end side conductor exposure part 103, when providing the heat | fever for melt | dissolving the strand 101a with respect to the front end side conductor exposure part 103, the front end side conductor exposure part 103 It is possible to apply heat to all of the plurality of strands 101a constituting the surface without unevenness.

  Accordingly, it is possible to efficiently form the melt-fixed portion 107 over the entire conductor exposed portion 102 and to surely melt each of the plurality of strands 101a. Electric corrosion can be further suppressed.

  In particular, as described above, a conductor guide crimping allowable protrusion 27 as a barrel piece is formed separately from the wire barrel piece 25b of the wire barrel portion 25, and the wire barrel portion 25 is formed by the conductor guide crimping allowable protrusion 27. It is possible to crimp a part of the tip-side conductor exposed portion 103 independently of each other. Thereby, the crimping load when crimping the conductor tip 101T by the wire barrel portion 25 is transmitted to the conductor guide crimping portion 161, so that the conductor guide crimping portion 161 is not affected.

  That is, since the conductor guide crimping allowable protrusion 27 can be bent and deformed independently of the bending deformation accompanying the crimping of the wire barrel piece 25b, the leading end conductor exposed portion 103 is firmly fixed by the conductor guide crimping portion 161 alone. And can be guided in a pressure-bonded state.

  Further, according to the above-described configuration, the laser communication hole portion 180 can be formed between the conductor crimping portion 11 and the conductor guide crimping portion 161, so that the conductor exposed portion 102 exposed through the laser communication hole portion 180 can be prevented. Then, the laser L can be irradiated, and the fusion fixing portion 107 can be formed on the conductor exposed portion 102.

  Therefore, it is possible to reliably prevent the conductor exposed portion 102 exposed from the laser communication hole portion 180 from being eroded and the electrolyte from entering the gap between the strands 101a through the conductor exposed portion 102.

(Third embodiment)
The structure of the electric wire 1C with a crimp terminal in the third embodiment will be described with reference to FIG.
5A is an external view showing the crimp terminal 20C in the third embodiment and the wire tip portion 100T of the covered wire 100. FIGS. 5B and 5C show the tip-side conductor exposure, respectively. 5A and 5B are a plan view and a longitudinal sectional view of a part of the crimp terminal in the middle of forming the melted and fixed portion 107 in the portion 103, and FIGS. The top view and longitudinal cross-sectional view of a part of crimp terminal part in the state after forming the adhering part 107 are shown.

In the electric wire with crimp terminal 1 </ b> C in the third embodiment, an exposed conductor support portion 170 is formed on the bottom portion 22 a of the first transition 22 in the crimp terminal 20. The exposed conductor support portion 170 includes a base portion that protrudes upward with respect to the bottom portion 22a of the first transition 22, and a support protrusion piece that protrudes substantially horizontally with respect to the bottom surface so that the tip-side conductor exposed portion 103 can be placed on the base portion. 172.
The exposed conductor support part 170 is configured by folding back a part of the bottom part 22a of the first transition 22 to the rear side.

The tip-side exposed conductor 101 is disposed in a state where it is supported by the exposed conductor support portion 170. As described above, by disposing the tip-side exposed conductor 101 on the exposed conductor support portion 170, a plurality of strands constituting the tip-side exposed conductor 101 are compared with the case where the tip-side exposed conductor 101 is directly disposed on the bottom 22a of the first transition 22. 101a is guided to be pushed up from below by the support protrusion 172. Then, as shown in FIG. 5 (b1), the plurality of strands 101a are spread in the width direction in the support protrusion 172, and the plurality of strands 101a overlapped in the vertical direction of the tip-side exposed conductor 101. Overlapping can be suppressed.
That is, it is possible to suppress the vertical arrangement of the plurality of strands 101a in the tip-side exposed conductor 101 from being varied in the vertical direction.

  When the laser irradiation head 171 is arranged above the tip-side exposed conductor 101 supported by the support protrusion 172 in this way, the height (interval) between the tip of the laser irradiation head 171 and each of the plurality of strands 101a. ) Can be substantially matched.

  Therefore, when the laser L is irradiated from the tip of the laser irradiation head 171 to the tip-side exposed conductor 101 in such a state, the laser beam is focused on each of the plurality of strands 101a, and The laser can be irradiated under an appropriate laser irradiation intensity.

  Specifically, when the tip-side exposed conductor 101 is not supported by the support protrusion 172, the plurality of strands 101a often overlap each other and are arranged in a bulky state in the vertical direction.

  In such a case, for example, when the laser beam is focused on the element wire 101a disposed on either the upper side or the lower side of the exposed conductor 101 on the distal end side, the other one that is not in focus is irradiated. The strand 101a arranged on the side is irradiated with a laser beam weaker than a desired intensity, and these strands 101a remain without melting. As a result, the tip-side exposed conductor 101 The surface area cannot be reduced and the desired electric corrosion resistance cannot be obtained.

  Alternatively, when the laser is irradiated in order in a state where each of the plurality of strands 101a is focused on the entire tip-side exposed conductor 101, there is a problem that it takes a laser L irradiation time.

  On the other hand, when the laser irradiation intensity is set higher than the desired irradiation intensity and the laser beam L is irradiated at once to the plurality of strands 101a in the tip-side exposed conductor 101, the strand 101a melted on the entire bottom portion 22a of the first transition 22 is melted. Is diffused and the tip-side exposed conductor 101 is deformed.

  In contrast to the configuration in which the tip-side exposed conductor 101 is not supported by the support protrusion 172, the tip-side exposed conductor 101 is supported by the support protrusion 172, so that the plurality of strands 101a in the tip-side exposed conductor 101 are vertically moved. Variation in the position of the laser beam can be suppressed, and the laser beam can be irradiated with the laser beam being focused on each of the plurality of strands 101a and under an appropriate laser irradiation intensity.

  Therefore, the melt-fixed portion 107 can be appropriately formed on the tip-side exposed conductor 101 without the tip-side exposed conductor 101 being deformed, and the corrosion resistance performance of the tip-side exposed conductor 101 can be improved. .

(Fourth embodiment)
The configuration of the crimp terminal-attached electric wire 1C according to the fourth embodiment will be described with reference to FIG.
6A is an external view showing the crimp terminal 20C and the wire tip portion 100T in the fourth embodiment, and FIG. 6B is a diagram showing the wire tip portion 100T crimped to the wire crimp portion 10. It is action | operation explanatory drawing of 1 C of electric wires with a crimp terminal in 4th Embodiment which shows a mode that the laser L is irradiated to the front end side conductor exposed part 103 in the state, and the fusion | melting fixation part 107 is formed.

  As shown in FIG. 6A, the crimp terminal 20C in the fourth embodiment is configured such that the tip end portion of the tip-side exposed conductor 101 can be guided to the conductor exposed portion placement location 110F on the bottom 22a of the first transition 22. A conductor tip guide protrusion 178 that protrudes upward from the bottom 22a of one transition 22 is formed.

  According to the above configuration, when the tip-side exposed conductor 101 is arranged at the tip-side exposed conductor exposed portion placement location 110F, the tip portions of the plurality of strands 101a constituting the tip-side exposed conductor 101 are used as the conductor tip guide protruding pieces 178. It can arrange | position in the state contact | abutted.

  Thereby, as shown in FIG.6 (b1), the position of the longitudinal direction of the front-end | tip part of the some strand 101a can be arrange | equalized. Therefore, the fusion | bonding part 107 can be smoothly formed by irradiating the laser L with respect to the front end side exposed conductor 101 in the state where the position of the front end part of the some strand 101a was equal.

  Furthermore, by irradiating the tip-side exposed conductor 101 with the laser L, as shown in FIG. 6 (b2), the melted wire 101a flows out to the box portion 21 side and is diffused unexpectedly. The effect that it can block | prevent with the protrusion 178 can also be show | played.

(Fifth embodiment)
The configuration of the crimp terminal-attached electric wire 1D in the fifth embodiment will be described with reference to FIG.
FIG. 7 is an external view showing the crimp terminal 20D and the wire tip portion 100T in the fifth embodiment.

  The crimp terminal 20D in the fifth embodiment is a conductor tip disposed in the wire barrel portion 25 on both side portions in the length direction of the wire barrel portion 25 of the crimp terminal 20D, that is, the first transition 22 and the second transition 24. A side guide piece 179 that guides the portion 101T from the side is formed. The side guide piece 179 includes a first side guide piece 179a that guides the front end side conductor exposed portion 103 from the side, and a second side guide piece 179b that guides the rear side conductor exposed portion 104 from the side. doing.

  The first side guide piece 179a is provided in the first transition 22, and the second transition 24 is provided in the second transition 24. Both of the protruding portions protruding outward in the width direction are bent inward in the width direction. It is formed in a bent shape.

  According to the above configuration, the front-end-side conductor exposed portion 103 is guided from both sides in the width direction so as not to spread in the width direction by the first side guide piece 179a, and the rear-side conductor exposed portion 104 is guided by the second side guide piece 179b. By guiding from both sides in the width direction so as not to spread in the width direction, the tip-side conductor exposed portion 103 and the rear-side conductor exposed portion 104 can be held at the intermediate portion in the width direction of the wire barrel portion 25. it can.

  Therefore, it is easy to irradiate the laser beam L to the tip-side conductor exposed portion 103 in a state where each of the plurality of strands 101a constituting the tip-side conductor exposed portion 103 is not unnecessarily diffused in the width direction and smoothly melt and fix. The portion 107 can be formed.

  Furthermore, the melt-fixed portion 107 is attached to the tip-side conductor exposed portion 103 or the rear-side conductor exposed portion 104 without the tip-side conductor exposed portion 103 or the rear-side conductor exposed portion 104 diffusing in the width direction. Can be formed.

The connector terminal connection structure of the present invention corresponds to the electric wire with crimp terminal 1, 1A, 1B, 1C, 1D of this embodiment.
The wire connection portion corresponds to the wire crimping portion 10,
The conductor connection portion corresponds to the conductor crimping portion 11,
The insulation coating connecting portion corresponds to the insulation coating crimping portion 12,
The connection terminal 20 corresponds to the crimp terminal 20,
The wire connection allowable portion corresponds to the wire crimping allowable portion 29,
The conductor connection allowing portion corresponds to the wire barrel portion 25,
The insulating coating connection permission portion corresponds to the insulation barrel portion 23,
The conductor exposed portion 102 (the tip side conductor exposed portion 103 or the rear side conductor exposed portion 104) corresponds to the conductor exposed portion,
The predetermined arrangement location corresponds to the conductor exposed portion arrangement location 110,
The guide means corresponds to the conductor guide crimping portion 161, the exposed conductor support portion 170, the conductor tip guide protrusion 178, or the side guide piece 179,
Although the laser communication portion corresponds to the laser communication hole portion 180, the present invention is not limited to the above-described embodiment, and can be formed in various other embodiments.

  For example, the laser communication hole 180 in the electric wire 1A with a crimp terminal according to the second embodiment has the above-described size as long as the exposed tip end conductor exposed portion 103 is opened with a size that allows laser L irradiation. It is not limited to the shape, and can be formed in various sizes, shapes, and positions, and the number of formation is not limited to one, and a plurality of them can be formed.

  Specifically, as the wire 1A ′ with crimp terminal according to another embodiment, the laser irradiation allowing portion 26 ′, as shown in FIG. 8A, the conductor guide crimping allowing protrusion 27 and the wire barrel portion 25 are used. In contrast, it is formed in a concave shape recessed in a semicircular arc shape on the inside.

  With the above configuration, a part of the tip-side conductor exposed portion 103 is crimped by the conductor guide crimping allowable projecting piece 27, whereby the laser irradiation allowing portion 26 ′ positioned on both sides in the width direction as shown in FIG. 8B. Can be formed at the intermediate portion in the width direction, and a laser communication hole portion 180 ′ opened in a substantially circular shape in plan view with a part of the tip-side conductor exposed portion 103 exposed.

Moreover, as another embodiment, the connection structure of the present invention can be configured by a wire 1E with a crimp terminal as shown in FIG. 9 (a).
The electric wire 1E with a crimp terminal irradiates a portion where a pair of wire barrel portions 25 facing each other at the intermediate portion in the width direction of the conductor crimp portion 11 is in contact with the laser L, and between the pair of wire barrel portions 25 The structure may be such that the conductor tip 101T exposed from the slight gap is melted, and the fusion fixing part 107 is formed between the pair of wire barrels 25.

  According to the configuration described above, the electrolytic solution enters the inside of the wire barrel portion 25 through a slight gap between the pair of wire barrel portions 25 facing each other, and prevents corrosion of the conductor tip portion 101T that is crimped by the wire barrel portion 25. be able to.

  As another embodiment, as shown in FIG. 9B, the connection structure according to the present invention has the melt-adhered portion 107 formed not only on the tip-side conductor exposed portion 103 but also on the rear-side conductor exposed portion 104. It can be comprised with the electric wire 1F with a crimp terminal.

  Alternatively, in the connection structure of the present invention, as shown in FIG. 9C, the resin layer 185 is formed on the surface of the tip-side conductor exposed portion 103, the rear-side conductor exposed portion 104, and the conductor crimping portion 11. It can comprise with the electric wire 1G with a crimp terminal.

  With the configuration of the electric wire with crimp terminal 1F and the electric wire with crimp terminal 1G described above, the corrosion resistance against water can be further improved.

  In particular, since the melt-adhered portion 107 is formed in the tip-side conductor exposed portion 103 and the rear-side conductor exposed portion 104, a resin layer is formed against the tip-side conductor exposed portion 103 and the rear-side conductor exposed portion 104. In configuring 185, the amount of resin can be greatly reduced as compared with the prior art.

  Therefore, the crimp terminal-equipped electric wire 1G can obtain excellent corrosion resistance against water, and the thickness of the resin layer 185 can be reduced as shown in FIG.

  Therefore, the electric wire 1G with a crimp terminal can be securely attached to the terminal attachment hole in the housing, and can be smoothly and firmly inserted into the mating terminal.

  Further, the fusion fixing portion 107 formed on the conductor exposed portion 102 (the tip side conductor exposed portion 103, the rear side conductor exposed portion 104) is not limited to being formed only on the surface side of the conductor exposed portion 102, and It may be formed on the entire surface including the inside or only a part of the surface.

  Furthermore, the conductor guide crimping part 161, the exposed conductor support part 170, the conductor tip guide projection piece 178, or the side guide piece 179 as the guide means described above is a predetermined crimp terminal in any combination of two or more of them. 20 may be formed.

  Further, as a method of forming the melt-fixed portion 107 on the conductor exposed portion 102, for example, while manually moving the laser L irradiation head 171 while holding it, the laser L is placed at an appropriate position in the conductor exposed portion 102. Irradiation can form the melt-fixed portion 107, but the present invention is not limited to such a laser irradiation method. For example, the head 171 is automatically moved using a drive source such as a motor or a drive transmission mechanism such as a guide rail. Other laser irradiation methods such as driving may be employed.

  Further, the position where the melted and fixed portion 107 is formed with respect to the tip-side conductor exposed portion 103 may be detected visually, but in addition, the position is detected based on image data detected by a camera or the like. May be.

  The type of the laser L is not particularly limited, such as a diode laser or a CO2 (carbon dioxide gas) laser, but is preferably a YAG laser such as an Nd-YAG laser or an Er-YAG laser.

  As described above, the present invention is not limited to the above-described embodiment, and can be configured in various embodiments.

1, 1A, 1A ', 1B, 1C, 1D, 1E, 1F, 1G ... Electric wire with crimp terminal 11 ... Conductor crimp part 20, 20A, 20B, 20C, 20D ... Crimp terminal 25 ... Wire barrel part 100 ... Coated wire 100T ... Electric wire tip 101 ... Conductor 101a ... Wire 101T ... Conductor tip 102 ... Conductor exposed part 103 ... Leader side conductor exposed part 107 ... Melting and fixing part 110 ... Conductor exposed part arrangement place 150 ... Insulation coating 161 ... Conductor guide crimping part 170 ... Exposed conductor support part 178 ... Conductor tip guide protrusion 179 ... Side guide piece 180 ... Laser communication hole 185 ... Resin layer L ... Laser

Claims (4)

Conductor made of wires of the plurality book consists covered with an insulating coating Rutotomoni, covered electric wire wire tip having the conductor tip insulation covering is removed at the tip end of the conductor is provided in the distal end side When,
Consists of a metal nobler than metal constituting the conductor Rutotomoni, there configuration connection structure between the connection terminal to the electric wire connection allowance portion is provided with said conductor connection permission unit conductor tip Ru is connected And
In the connection terminal,
While a transition is provided in front of the conductor connection permission portion of the wire connection permission portion,
A conductor that guides the exposed portion of the conductor so that the element wire does not disperse at a predetermined location where the exposed portion of the conductor is exposed at least with respect to the conductor connection allowable portion at the leading end of the wire. Guide means are provided ,
The conductor guide means includes
Consists of an exposed conductor support that guides the tip of the conductor tip at the bottom of the transition,
The exposed conductor support portion includes a base portion that protrudes upward with respect to the bottom portion of the transition, and a support protrusion that protrudes substantially horizontally with the bottom surface on which the conductor exposed portion is placed with respect to the base portion.
At the conductor exposed portion of the conductor tip portion guided by the exposed conductor support portion, a fusion fixing portion is formed in which a plurality of the strands constituting the conductor are melted so as to be integrated and fixed to each other. The connection structure. Conductor made of wires of the plurality book consists covered with an insulating coating Rutotomoni, covered electric wire wire tip having the conductor tip insulation covering is removed at the tip end of the conductor is provided in the distal end side When,
Consists of a metal nobler than metal constituting the conductor Rutotomoni, there configuration connection structure between the connection terminal to the electric wire connection allowance portion is provided with said conductor connection permission unit conductor tip Ru is connected And
In the connection terminal,
A first transition is provided in front of the conductor connection permission portion of the wire connection permission portion, and a second transition is provided in the rear, and
A conductor that guides the exposed portion of the conductor so that the element wire does not disperse at a predetermined location where the exposed portion of the conductor is exposed at least with respect to the conductor connection allowable portion at the leading end of the wire. Guide means are provided ,
The conductor guide means includes
It is formed of a side guide piece that is formed in the first transition and the second transition and guides the exposed conductor portion arranged in the conductor connection allowing portion from the side,
A fusion fixing portion in which a plurality of the strands constituting the conductor are fused and fixed to each other is formed in the conductor exposed portion guided by the conductor guide means. Structure. The conductor connecting portion the conductor tip connected to said conductor connection allowing portion is provided,
Wherein the conductor exposed portion, the distal end side conductor exposed portion where the conductive tip is exposed to the conductor connection allowing portion in the distal end side of the conductor connecting part is provided,
The connection structure according to claim 1 or 2 , wherein the melt-fixed portion is formed in the exposed portion of the distal end side conductor. The connection structure according to claim 3, wherein a resin layer is formed on a surface of the conductor connection portion.

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