JP2012069449A - Crimp terminal, connection structure, and connector - Google Patents

Abstract

An object of the present invention is to provide a crimp terminal, a connection structure, and a connector capable of preventing the occurrence of electrolytic corrosion while ensuring conductivity even if the wire conductor is crimped by a barrel piece even if it is made of a different metal. And
A crimping terminal 10 is provided with barrel pieces 32 on both sides in the width direction that constitute a crimping portion 30 that surrounds and crimps an exposed portion of an aluminum core wire 201. The barrel piece 32 is connected to the aluminum core wire 201. It is made of different conductive dissimilar metals, is formed longer than the length of the exposed portion of the aluminum core wire 201, and includes an insulating coating portion 37 on the surrounding surface 30A of the crimp portion 30. The crimp portion 30 includes the aluminum core wire. The barrel piece 32 is configured to be pressure-bonded so as to integrally surround from the tip side of the tip of 201 to the tip side covered portion of the covered electric wire 200.
[Selection] Figure 1

Description

  For example, the present invention relates to a crimp terminal that is mounted on a connector or the like that bears a connection between wire harnesses for automobiles, a connection structure using the crimp terminal, and a connector that is mounted with the connection structure.

  2. Description of the Related Art In recent years, automobiles are equipped with various electrical devices with the trend toward higher performance and higher grades, and their electrical circuits are becoming more and more complex, and a stable power supply to each electrical device is indispensable.

  An automobile equipped with the above-described electrical equipment is wired with a wire harness in which covered electric wires are bundled, and the wire harnesses are connected with a connector to form an electric circuit. Further, these connectors have a crimp terminal that is crimped and connected to a covered electric wire, and are configured to fit a female connector and a male connector that are connected corresponding to the unevenness.

  However, when moisture enters from the crimped part where the crimped terminals installed inside these connectors are crimped and connected to the covered wire, the surface of the wire conductor exposed from the tip of the covered wire is corroded, and this corrosion makes the conductive There was a problem that decreased.

  This kind of problem is caused by the gap between the crimping surface of each barrel between the insulation barrel that crimps the coated portion of the sheath of the coated wire and the wire barrel that crimps the exposed portion of the wire conductor that is exposed on the distal side of the sheath. It is thought that corrosion occurs because there is a gap in the wire and the wire conductor is exposed.

Therefore, by sealing the wire conductor from the tip of the wire conductor to the tip of the sheath with a crimp terminal that integrates the wire barrel and the insulation barrel, there is sufficient sealing to prevent moisture from entering. There has been proposed a terminal mounting method for an aluminum electric wire which is supposed to be obtained (see, for example, Patent Document 1).
However, in the recent complicated electric circuits, it is necessary to ensure more stable conductivity, and the crimp terminal cannot sufficiently secure conductivity.

  In addition, at the present time when reduction of carbon dioxide emissions emitted by automobiles is required, demand for electric vehicles and hybrid vehicles in which wire harnesses are used more frequently than gasoline vehicles is increasing.

  Under these circumstances, the weight reduction of vehicles including gasoline cars has a great impact on fuel efficiency. Therefore, not only copper (or copper alloy) but also light aluminum (or copper) is used for wire harnesses and battery cables. Aluminum alloy) is used to reduce weight.

  In addition, when an aluminum wire made of aluminum or an aluminum alloy is crimped and connected to a crimp terminal made of copper or a copper alloy, if moisture such as dew condensation or seawater intervenes between the contact portions, Electrochemical reaction occurs between different metals as electrolyte.

  As a result, the phenomenon that base aluminum and aluminum alloys are corroded by noble metal species such as tin plating, gold plating, and copper alloys of terminal materials, that is, the problem of corrosion between different metals (hereinafter referred to as electrolytic corrosion) occurs. There is.

  When this electric corrosion occurs, the crimped aluminum wire is corroded and dissolved and disappears at the crimping portion of the crimping terminal, and eventually there is a risk that the electrical resistance increases and the sufficient conductive function cannot be performed. Therefore, when using an aluminum wire, there is a need for an electrolytic corrosion prevention technique that reliably prevents moisture from entering.

In Patent Document 1, it is also described that an epoxy paint is applied at the time of pressure bonding for the purpose of improving water-stopping as an example of an electric corrosion prevention technique.
However, applying an epoxy paint at the time of pressure bonding is not preferable for mass production because it takes time for the application process. In addition, it is very difficult to accurately determine the application position and application amount of the epoxy paint at the time of pressure bonding, which makes it difficult to realize a highly reliable electric corrosion prevention technique.
As described above, the method of applying the epoxy paint at the time of pressure bonding is not satisfactory because of many technical problems.

Japanese Patent Laid-Open No. 56-13685

  Therefore, the present invention provides a crimp terminal, a connection structure, and a connector that can prevent the occurrence of electrolytic corrosion while ensuring conductivity even when the wire conductor is crimped with a barrel piece even if it is made of a different metal. With the goal.

  The present invention relates to a barrel that constitutes a crimping portion that surrounds and crimps an exposed portion of the wire conductor that is exposed for a predetermined length from the tip of the covering body in a covered wire in which the outer periphery of the wire conductor is covered with an insulating covering body. Crimp terminals provided on both sides in the width direction, wherein the barrel piece is made of a different kind of conductive metal different from the wire conductor, and is longer in the longitudinal direction than the length of the exposed portion of the wire conductor And at least a part of the surrounding surface of the crimping portion is provided with an electrolytic corrosion prevention means, and the crimping portion is integrated continuously from the tip side of the wire conductor to the tip side covering portion of the covering body. The barrel piece is pressure-bonded so as to be surrounded by

The said crimping | compression-bonding part can be made into the crimp part of an open barrel type comprised by the crimping | compression-bonding part bottom face, and the barrel piece provided in the width direction both sides, or a closed barrel type crimping part.
The said surrounding surface can be made into the inner surface side of the crimping | compression-bonding part bottom surface provided with the inner surface side of the barrel piece provided in the crimping | compression-bonding part, and also the barrel piece in the width direction both sides.

The dissimilar metal is a conductive dissimilar metal different from the material of the wire conductor, and can be a barrel piece made of copper or copper alloy, for example, with respect to the wire conductor made of aluminum or aluminum alloy.
The said at least one part is a part used as the inner peripheral contact surface of the barrel piece which press-fits and contacts a covered electric wire and an electric wire conductor.

  The electrolytic corrosion preventing means is a means for preventing the occurrence of electrolytic corrosion by maintaining non-conduction between dissimilar metals regardless of the presence of moisture by interposing an insulating material between the electric wire conductor and the crimping portion, or an electric wire By sealing with a sealing material or a water-stopping medium such as a sealing liquid interposed between the conductor and the crimping portion, it is possible to prevent moisture from entering and prevent the occurrence of electrolytic corrosion. Furthermore, it is possible to configure the electrolytic corrosion preventing means by means of sharing both of these.

According to the present invention, when the barrel piece for crimping the electric wire conductor is made of a different metal different from the electric wire conductor, even if the crimp terminal has a crimp portion made of the different metal, electric conductivity is ensured while ensuring conductivity. Occurrence can be prevented.
That is, since the electrolytic corrosion preventing means is provided on at least a part of the surrounding surface of the crimping portion, the electrolytic corrosion preventing means on the surrounding surface surrounds and crimps the electric wire conductor only by crimping at the crimping portion. For this reason, reliable electrolytic corrosion prevention at the crimping part can be ensured by the electrolytic corrosion preventing means provided on the surrounding surface.
Further, since the electric wire conductor is integrally surrounded by the barrel piece, it is possible to prevent the intrusion of moisture from the outside, and to reliably prevent electrolytic corrosion.

As an aspect of the present invention, the electrolytic corrosion preventing means is interposed between the surrounding surface and the wire conductor at least at a part of the front end side of the surrounding surface of the crimping portion surrounding the tip portion of the wire conductor. It can be constituted by an insulating means in the width direction.
The said at least one part is a part used as the inner peripheral contact surface of the barrel piece which crimps | contacts and contacts a wire conductor.
The insulating means includes a coating portion in which the surrounding surface is coated with a non-conductive material (insulating material) suitable for electrical insulation, and a sheet in which the insulating material is configured in a seal shape and interposed between the barrel piece and the wire conductor. It can be a body.

  If the insulating means is used, the insulating material is interposed between the different types of metals, so that the insulation works between the different types of metals regardless of the presence of moisture, that is, the different types of metals are not electrically connected. Occurrence can be prevented. For this reason, even if the front end side of the electric wire conductor is open, an electrolytic corrosion preventing function can be obtained. As a result, it is no longer necessary to seal the tip end side of the wire conductor, and crimping to the circular opening portion on the tip end surface side of the wire conductor can be omitted to reduce the number of crimping steps.

As an aspect of the present invention, a drain hole can be formed in the vicinity of the bottom surface of the barrel piece provided with the insulating means.
The vicinity of the bottom surface is a bottom surface position of the barrel piece to which the insulating means is applied, or a bottom surface position on the front side from the formation position of the insulating means.

  According to the present invention, for example, even when water enters between the box portion and the crimping portion of the crimp terminal, the entered moisture is discharged to the outside through the drain hole. For this reason, it becomes the crimping | compression-bonding structure between the dissimilar metals which do not receive the bad influence of a water | moisture content, and can implement | achieve the stable electrolytic corrosion prevention structure.

Further, as an aspect of the present invention, the electrolytic corrosion preventing means is a water stopping means that forms a water stopping medium in the width direction on at least a part of the longitudinal end of the surrounding surface of the crimping portion to stop the water. Can be configured.
The said at least one part is a part used as the inner peripheral contact surface of the barrel piece which crimps | contacts and contacts a covered electric wire.

  The water stop means may be made of resin or rubber, and further, a resin or rubber sheet having adhesion to the material itself is directly attached to the metal substrate, or a resin or rubber sheet. It can be obtained by adhering to a metal substrate via an adhesive, or by applying a resin or rubber having an uncured fluidity on the metal substrate and curing it. In addition, the hardening effect | action can be based on systems, such as a heat | fever, an ultraviolet-ray, 2 liquids, anaerobic, and moisture.

  According to the present invention, it is possible to reliably prevent the intrusion of moisture into the inside of the crimping portion that continuously and integrally surrounds from the tip of the electric wire conductor to the tip side covering portion of the covering. Specifically, since the rear end side end of the pressure-bonding portion that integrally surrounds can be stopped by the water-stop means in the width direction, the boundary surface between the pressure-bonding portion and the cover, the bottom surface of the pressure-bonding portion and the barrel piece in the pressure-bonding portion It is possible to reliably prevent moisture from entering from the boundary surface.

  Further, as an aspect of the present invention, in the pressure-bonding portion in a pressure-bonded state, the width direction end portion on the surrounding surface side of one barrel piece and the width direction end portion on the surrounding surface side of the other barrel piece are opposed from both sides, It can be set as the structure which makes the opposing part of this barrel piece planarly oppose over a longitudinal direction, and is crimped | bonded.

According to the present invention, the barrel pieces on both sides can be pressure-bonded so as to face each other toward the center in the width direction so as to be pressed against each other and brought into surface contact with each other. At this time, since the planes face each other in a state where the planes are in contact with each other in the circumferential direction, the crimping part is pulled toward the end of the barrel piece as the base of the planar crimping part facing the plane is strongly crimped. The degree of narrowing down can be strengthened. That is, it is possible to increase the pressure bonding strength.
Further, since it is a flat crimping means, it is only necessary to press from the left and right in the crimping direction, and the crimping operation can be simplified and the crimping process can be shortened.

As an aspect of the present invention, the water stopping means can be formed on at least one plane facing side of the barrel piece.
According to the present invention, it is possible to stop the water only by providing the water stopping means at the plane facing portion. Moreover, since it is a plane part, a sheet-like water stop member etc. can be interposed stably stably. Moreover, since it pressurizes uniformly when it pressurizes between crimping surfaces from right and left, it can stop water stably.

  Further, as an aspect of the present invention, in the crimping portion in a crimped state, an end portion of one barrel piece covers an outer end portion of an end portion of the other barrel piece, and an overlapping portion in a longitudinal direction where the end portions overlap each other. Can be formed.

  According to the present invention, in the open barrel-type crimping portion, it is possible to suppress the intrusion of moisture from the overlapping portion, which is the mating portion in the longitudinal direction where the barrel pieces in the crimped state are joined together. Therefore, it is possible to more reliably prevent moisture from entering the inside of the crimping portion that integrally surrounds the tip of the wire conductor to the tip of the covering.

  Moreover, as an aspect of the present invention, the water stop means can be formed on at least one of the opposing portions in the vicinity of the end of the barrel piece forming the overlapping portion.

Each facing portion in the vicinity of the end of the barrel piece forming the overlapping portion is an inner surface of the other barrel piece with respect to the outer surface of the one barrel piece.
According to the present invention, it is possible to more reliably prevent moisture from entering from the overlapped portion, which is a longitudinally aligned portion where the barrel pieces in the crimped state are combined.

Moreover, as an aspect of this invention, it can be set as the structure which the width direction end surfaces of both barrel pieces face each other in the said crimping | compression-bonding part of a crimping | compression-bonding state.
According to the present invention, in the open barrel-type crimping portion, it is possible to suppress the intrusion of moisture from the portion where the end surfaces in the width direction of the barrel pieces in the crimped state abut each other in the longitudinal direction. Therefore, it is possible to further reliably prevent moisture from entering the inside of the crimping portion that integrally surrounds the tip of the wire conductor to the tip of the covering body.

As an aspect of the present invention, the water stop means can be formed on at least one of the width direction end faces of the barrels.
According to the present invention, it is possible to more reliably prevent moisture from entering from the abutting portion in the longitudinal direction where the end surfaces in the longitudinal direction of the barrel pieces in the crimped state abut each other.

Moreover, this invention is the connection structure which connected the said covered electric wire and the said crimp terminal by the crimp part in the above-mentioned crimp terminal.
According to the present invention, it is possible to configure a connection structure that can ensure reliable water-stopping only by crimping at the crimping portion of the crimping terminal. Therefore, stable conductivity can be ensured.

As an aspect of this invention, it can arrange | position and connect so that the front-end | tip of the said electric wire conductor may become the longitudinal direction intermediate position in the said crimping | compression-bonding part.
The said longitudinal direction intermediate position is a position including the whole area | region of the longitudinal direction of a crimping | compression-bonding part.
According to this invention, the tip of the electric wire conductor to the tip of the covering body are continuously and integrally surrounded by the crimping portion, and moisture can be prevented more reliably from entering the inside of the crimping portion.

  Moreover, as an aspect of the present invention, the electric wire conductor in the covered electric wire can be composed of an aluminum electric wire conductor.

  The said aluminum electric wire conductor can be used as the electric wire conductor comprised with an aluminum strand or an aluminum alloy strand.

  According to the present invention, for example, even when the crimp terminal is made of a copper alloy plated with tin, etc., the electrolytic corrosion that corrodes the aluminum wire conductor, which is a base metal, compared to the copper alloy constituting the crimp terminal. Can be prevented. Therefore, it is possible to configure a connection state in which stable conductivity is ensured regardless of the metal type constituting the crimp terminal and the wire conductor.

In addition, the present invention is a connector in which the crimp terminal in the connection structure described above is disposed in a connector housing.
By this invention, the fitting state which ensured the stable electroconductivity can be comprised irrespective of the metal seed | species which comprises a crimp terminal and an electric wire conductor.

  According to the present invention, there are provided a crimp terminal, a connection structure, and a connector capable of preventing the occurrence of electrolytic corrosion while ensuring conductivity even when the wire conductor is crimped with a barrel piece even if it is made of a different metal. be able to.

The perspective view which shows the crimp terminal and electric wire conductor of Example 1. FIG. The perspective view which shows the state which the crimp terminal of Example 1 crimped | bonded the electric wire conductor. Explanatory drawing about the chain terminal stamped and formed by the press of Example 1. FIG. Explanatory drawing which shows in part a cross section the internal state which crimped | bonded the crimp terminal of Example 1. FIG. The perspective view which shows the other electrolytic corrosion prevention structure of the crimp terminal of Example 1. FIG. The perspective view which shows the connection corresponding state of the male connector and female connector of Example 1. FIG. The perspective view which shows the crimp terminal and electric wire conductor of Example 2. FIG. Explanatory drawing which shows the state before crimping of the crimp terminal of Example 2, and the state after crimping partially in cross section. Explanatory drawing about the chain terminal stamped and formed by the press of Example 2. FIG. The perspective view which shows the state which the crimp terminal of Example 2 crimped | bonded the electric wire conductor. The perspective view which shows the state before crimping of the crimp terminal of Example 3, and the state after crimping. Explanatory drawing which shows the state before crimping of the crimp terminal of Example 3, and the state after crimping partially in cross section.

  An embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a perspective view of a corresponding state of the female crimp terminal 10 and the covered electric wire 200 before crimping. FIG. 2 shows a perspective view of the state after the female crimp terminal 10 crimps the coated electric wire 200. FIG. 3 is an explanatory view of the chain terminal 110 constituting the female crimp terminal 10. Specifically, FIG. 3A shows a plan view of the copper alloy strip 100 when the chain terminal 110 constituting the female crimp terminal 10 is formed by punching, and FIG. 3B shows the female crimp terminal 10. The bottom view of the copper alloy strip 100 which carries out the punching formation of the chain terminal 110 to perform is shown.

  FIG. 4 is an explanatory view of the female crimp terminal 10. Specifically, FIG. 4A shows a longitudinal sectional view in the center in the width direction of the female crimp terminal 10, and FIG. 4B shows a rear view of the female crimp terminal 10 on the side to which the covered electric wire 200 is connected. 4 (c) shows a longitudinal sectional view at the center in the width direction of the crimped connection structure 1, FIG. 4 (d) shows an enlarged sectional view taken along line AA in FIG. 4 (c), and FIG. (E) has shown the principal part expansion perspective view by the side of the front-end opening part of the crimping | compression-bonding part 30 in the crimping connection structure 1. FIG.

  First, the female crimp terminal 10 will be described. The female crimp terminal 10 includes a box portion 20 that allows insertion of an insertion tab provided in a male connector (not shown) from the front, which is the front end side in the longitudinal direction X, to the rear. At the rear, the crimping part 30 disposed via a transition part 20a having a predetermined length is integrally formed. The longitudinal direction X is a direction that coincides with the longitudinal direction of the covered electric wire 200.

The covered electric wire 200 to be crimped and connected to the female crimp terminal 10 is configured by covering an aluminum core wire 201 in which aluminum strands are bundled with an insulating covering portion 202.
The female crimp terminal 10 is an open barrel type terminal that is three-dimensionally configured by punching a copper alloy strip 100 (see FIG. 3) such as brass whose surface is tin-plated (Sn-plated) and then bending it. In addition, the crimping | compression-bonding part of the male crimping terminal provided with the insertion tab inserted in the box part 20 is also comprised by the same structure.

  The box portion 20 is formed of a hollow quadrangular prism, and as shown in FIG. 4 (a), an insertion tab (not shown) of a male connector that is bent and inserted rearward in the longitudinal direction X. The elastic contact piece 21 which has the dimple 21a which contacts is provided.

Furthermore, the ceiling part 22 (22a, 22b) of the box part 20 which is a hollow quadrangular prism body is formed by bending the extended part of the side surface part 23 (23a, 23b) so as to overlap.
Furthermore, as shown in FIGS. 4A and 4B, the ceiling portion 22b on the inner surface side has a sliding guide protrusion 22c having a semicircular cross section that protrudes in parallel with the longitudinal direction. Thereby, the contact resistance with the insertion tab of the male connector is reduced to smoothly guide the insertion.

As shown in FIG. 4B, the shape of the crimping portion 30 before crimping extends from the both sides of the crimping bottom surface 31 in the width direction Y obliquely outward and upward, and is a barrel piece 32 (32a, 32b) having a substantially rectangular shape in side view. And is formed in a substantially U-shaped rear view.
The length Xb of the barrel piece 32 in the longitudinal direction (FIG. 1) is the longitudinal direction of the exposed wire portion 201a exposed forward in the longitudinal direction X from the coating tip 202a which is the tip of the insulating coating portion 202 on the front side in the longitudinal direction X. It is formed longer than the exposed length Xw of X. Thereby, the electric wire exposed part 201a is covered with the barrel piece 32.

  Further, when the crimping portion 30 surrounds and crimps the bundle of aluminum core wires 201 in a circular cross section, the surrounding surface 30A that is the inner surface of the crimping portion 30 is surrounded by the wire crimping range 30a that surrounds and crimps the wire exposed portion 201a. The insulation coating portion 202 is set to a coating portion crimping range 30b that surrounds and crimps the insulation coating portion 202.

  And since the electric wire crimping range 30a and the covering portion crimping range 30b are formed in U-shapes corresponding to the outer diameters of the aluminum core wire 201 and the insulating covering portion 202 to be crimped, respectively, the insulating covering portion 202 is formed. The barrel piece 32 in the cover crimping range 30b to be crimped is formed longer than the barrel piece 32 in the wire crimping range 30a to crimp the aluminum core wire 201.

  Further, the wire crimping range 30 a of the crimping portion 30 includes a strip-like insulating coating portion 37 having a predetermined width at the front end portion in the longitudinal direction X and the width direction Y. The insulating coating portion 37 can be configured by coating an insulating material on the surrounding surface 30 </ b> A of the crimping portion 30 with a certain thickness that provides insulation.

  That is, after crimping, an insulating coating portion 37 that surrounds the tip end portion of the aluminum core wire 201 with a predetermined width length is interposed in a facing portion between the aluminum core wire 201 and the female crimp terminal 10, and the intervening insulating coating portion 37 is different. It is possible to insulate the metal so as not to be electrically connected.

  Specifically, an insulating coating portion 37 is provided at a position where the tip of the aluminum core wire 201 and the female crimp terminal 10 are in direct contact with each other so that moisture that causes electric corrosion does not adhere. . As a result, since different metals are separated from each other by a distance, even if moisture adheres to the portion as water droplets, the adhered water droplets adhere as “aluminum core wire 201, water droplets, insulating coating portion 37” or “female type” Attached as the crimp terminal 10, water droplets, insulating coating portion 37 ".

  For this reason, since moisture does not come into contact with the other, the electrical conduction between the aluminum core wire 201 and the female crimp terminal 10 is partitioned by the insulating coating portion 37, and the non-conductive state is established between the dissimilar metals 201 and 10. it dose not connect. Thereby, the fundamental cause of electrolytic corrosion can be eliminated and electrolytic corrosion can be reliably prevented.

  In addition, since the other crimp connection parts are crimped, moisture does not enter. Further, behind the position where the insulating coating portion 37 having a predetermined width and length is applied, since the insulating coating portion 37 is not interposed, the dissimilar metals 201 and 10 on the rear side are in direct contact with each other to conduct electricity. Enables electrical communication.

  For this reason, the cause of inducing the occurrence of electrolytic corrosion between dissimilar metals can be eliminated at the tip of the aluminum core wire 201 regardless of the presence of moisture. That is, an electrolytic corrosion preventing function for preventing the occurrence of electrolytic corrosion due to the insulating action is obtained.

  Furthermore, in order to ensure the function of preventing electric corrosion, the insulating coating portion 37 on the front side of the crimping portion 30 is attached from the viewpoint of the workability of crimping at the crimping portion 30 and the ease of attachment to the copper alloy strip 100 described later. What is necessary is just to select the thickness of the insulation coating part 37 suitably in the range which can ensure the insulation for preventing an electric corrosion.

  Insulation can be made of a resin insulating material, insulating paint, or the like. For example, an insulating material having a rubber property capable of obtaining an insulating layer having a constant thickness is preferable. Among them, as a result of repeated studies from the viewpoint of alkali resistance and heat resistance, silicon rubber, fluorine rubber, butyl rubber, butadiene rubber, ethylene Propyl rubber, nitrile rubber, etc. are suitable.

Thus, by providing the insulating coating part 37, even if the front end side of the aluminum core wire 201 is open, an electrolytic corrosion preventing function can be obtained.
For this reason, as shown in FIG. 4 (e), it is not necessary to seal the front end side of the aluminum core wire 201, and the front end of the aluminum core wire 201 that is continuous with the transition portion 20a that is the joint portion between the box portion 20 and the crimping portion 30 is eliminated. A crimping process that requires sealing of the circular opening portion on the front end side of the aluminum core wire 201 can be omitted with respect to the circular opening portion on the surface side. That is, it is not necessary to crush the tip of the barrel piece 32 that continues to the transition portion 20a.

As shown in FIG. 3, the female crimp terminal 10 is a chain terminal formed by punching a copper alloy strip 100 having a predetermined width provided with an insulating coating portion 37 on the surrounding surface 30A on the front end side of the crimp portion 30 into a terminal shape. 110 can be configured to be bent.
Specifically, an insulating coating portion 37 is provided at a predetermined position on the inner surface of the female crimp terminal 10 in the reflow tin-plated copper alloy strip 100.

  In this way, the female crimp terminal 10 is formed from the copper alloy strip 100 on which the insulating coating portion 37 is formed, and the coated electric wire 200 is crimped by the crimp section 30 of the female crimp terminal 10 to thereby form the crimp connection structure 1. Configure (FIG. 2).

  Specifically, with respect to the aluminum core wire 201 exposed on the front end side of the insulating coating portion 202 of the covered electric wire 200, the position in the longitudinal direction X of the tip 201b of the electric wire exposed portion 201a is the region of the insulating coating portion 37 in the crimping portion 30. The covered electric wire 200 is arranged in the crimping part 30 so as to correspond to the above.

And from the front-end | tip 201b of the electric wire exposure part 201a to the front-end | tip covering part of the insulation coating part 202 is crimped | bonded by the crimping | compression-bonding part 30, and it surrounds integrally.
At this time, as shown in FIG. 2, the upper end in the width direction of one barrel piece 32a and the upper end in the width direction of the other barrel piece 32b are opposed from both sides, and the opposite portions of the barrel pieces 32a and 32b are in the longitudinal direction. It is set as the structure made to carry out pressure bonding by making a plane opposition over.

At this time, the plane facing portion has a rectangular shape along the longitudinal direction, and the rectangular plane 33 of the left barrel piece 32a and the rectangular plane 33 of the right barrel piece 32b are exposed to the electric wire by a crimper jig (not shown). Crimping is performed in a state of being in plane contact immediately above the portion 201a and the insulating coating portion 202.
In this state, as shown in FIG. 2, the rectangular flat surface 33 of the left barrel piece 32a and the rectangular flat surface 33 of the right barrel piece 32b are in close contact with each other.

  In addition, since the planes face each other in a state where the planes are abutted with each other at the top in the circumferential direction, the more the base portion 33a (see FIG. 4C) of the rectangular plane 33 that faces the plane is strongly crimped, The peripheral surface portion is pulled and crimped to the top side of the barrel piece 32. As a result, as the root portion 33a of the rectangular flat surface 33 is more strongly crimped, it becomes possible to increase the crimping strength by increasing the degree of narrowing in the radial direction. Further, when the rectangular planes 33 are pressed from the left and right sides, they are pressed uniformly across the plane.

  When crimping in this manner, crimping is performed so as to wrap the covered electric wire 200 on the surrounding surface 30A of the crimping portion 30 and, at the top portion, planar crimping is performed in which the flat surfaces are brought into contact with each other. It is only necessary to squeeze, and a crimping operation in which the covered electric wire 200 is wrapped and crimped in a circular shape from the left and right, and a simplified crimping operation by a simple crimping process in which pressure is planarly applied from the left and right directions are possible.

  Further, as shown in FIG. 4E, a drain hole 34 is formed in the vicinity of the bottom surface of the barrel piece 32 to which the insulating coating portion 37 is applied. The drain hole 34 has such a size that even if water temporarily enters the transition part 20a, the drained water can be drained and drained naturally below the drain hole 34 at the bottom. is doing.

  As a result, even if moisture enters the transition portion 20a of the crimping portion 30, the moisture that has entered here is discharged to the outside through the drain hole 34, so that the moisture does not accumulate and is hardly affected by moisture. Yes.

Next, the crimp connection structure 1 configured by crimping the female crimp terminal 10 thus configured and the covered electric wire 200 will be described.
First, the chain terminal 110 is punched out from the copper alloy strip 100 on which the insulating coating portion 37 is applied, and further bent to form the female crimp terminal 10.

  When the covered electric wire 200 is arranged to correspond to the crimping portion 30 of the female crimp terminal 10, the female crimp terminal 10 and the covered electric wire 200 are arranged so that the tip 201 b of the aluminum core wire 201 corresponds to the insulating coating portion 37. Adjust and arrange the position in the longitudinal direction.

  In this arrangement state, crimping is performed so that the tip 201b of the wire exposed portion 201a to the tip-side covering portion of the insulating coating portion 202 is wrapped by the surrounding surface 30A of the crimping portion 30. At this time, as shown in FIG. 2, the rectangular flat surface 33 of one barrel piece 32a and the rectangular flat surface 33 of the other barrel piece 32b are pressed against each other at the central top portion in the width direction so as to face each other. .

  As a result, the covered electric wire 200 is crimped by the female crimp terminal 10 so as to be wrapped in the surrounding surface 30A, and at the same time, the rectangular planes 33, 33 on both sides at the tops of the barrel pieces 32a, 32b on both sides opposed from the left and right. They are pressurized. Therefore, the covered electric wire 200 that has received the applied pressure from the left and right directions is narrowed in such a manner that the circumferential direction is pulled toward the top, and the degree of narrowing in the radial direction is increased, so that sufficient crimping strength is obtained. In this way, the crimped connection structure 1 that is firmly crimped is configured.

In particular, when the problem of the electrolytic corrosion prevention technology is considered, when the female crimp terminal 10 and the aluminum core wire 201 are crimped and connected, the two are mechanically crimped and connected, and at the same time, the two are electrically connected. It is possible to achieve the original connection purpose of making contact and conducting.
On the other hand, as a technique for preventing electric corrosion, a water-stopping material such as epoxy paint is interposed so as to eliminate a slight facing gap between surrounding facing surfaces where the female crimp terminal 10 surrounds and crimps the aluminum core wire 201 during crimping. It is possible to stop the water.

  However, this water-stopping material not only eliminates the gap, but also the water-stopping material makes both non-contact and hinders conductivity. For this reason, there is a contradiction between the conduction performance of bringing different metals into contact with each other at the crimping part and the water-stopping performance of separating the different metals with a water-stopping material and eliminating the gap, but it is necessary to make them compatible. is there.

  However, in order to achieve both of these, the crimping portion is formed so as to obtain a conduction performance for bringing the female crimp terminal 10 and the aluminum core wire 201 into contact with each other and a water-stopping performance for making the contact non-contact, respectively. Since it is necessary to form locally in a site | part, it is difficult to make compatible performance compatible.

  Further, since the aluminum core wire 201 has a smaller diameter than the insulating coating portion 202 between the exposed outer peripheral surface of the aluminum core wire 201 and the inner peripheral surface of the female crimp terminal 10, the aluminum core wire 201 side is a barrel. The facing gap with the piece 32 is large. On the other hand, the gap facing the barrel piece 32 is small on the covering side.

  For this reason, the facing gap is different in the crimping portion 30 in the longitudinal direction from the tip portion of the aluminum core wire 201 to the tip side coated portion of the covered electric wire 200, and the water stoppage at the tip portion of the aluminum core wire 201 where the facing gap becomes the largest. It is necessary to increase it sufficiently.

  Therefore, the tip portion of the aluminum core wire 201 requires a water-stopping material capable of obtaining a high water-stopping function, and further surrounds the outer periphery of the aluminum core wire 201 without gaps so as to prevent moisture from entering from the outside. It is also necessary to stop the water on the front end side of the aluminum core wire 201 that is provided.

As a water stop means on the tip side of the aluminum core wire 201, the barrel piece 32 corresponding to the tip side of the aluminum core wire 201 is further crushed so as to close the circular opening space on the tip side of the aluminum core wire 201. It is conceivable to seal and eliminate the room for moisture to enter.
However, in order to ensure water-stopping, a process of sufficiently crushing the tip of the barrel piece 32 is required.

  From this point of view, when the crimped connection structure 1 is configured, an insulating coating portion 37 is provided on the surrounding surface 30A on the front end side of the crimping portion 30 in order to ensure electric corrosion prevention. For this reason, after crimping, an insulating coating portion 37 surrounding the tip portion of the aluminum core wire 201 with a predetermined width length is interposed in the facing portion between the aluminum core wire 201 and the female crimp terminal 10, and the interposed insulating coating portion 37 Different metals can be insulated so that they are not electrically connected.

  As a result, even if moisture adheres to one of the different metals as water droplets, moisture does not contact the other, so the electrical conduction between the aluminum core wire 201 and the female crimp terminal 10 is partitioned by the insulating coating portion 37, and the electrical conduction is lost. In this state, the dissimilar metals 201 and 10 are not electrically connected. Thereby, the fundamental cause of electrolytic corrosion can be eliminated and electrolytic corrosion can be reliably prevented.

  In addition, since the crimping | compression-bonding part other than that is crimped | bonded firmly without gap so that the aluminum core wire 201 may be wrapped with the barrel piece 32, sufficient water stop is obtained and there is no room for moisture to enter. Further, behind the position where the insulating coating portion 37 having a predetermined width and length is applied, since the insulating coating portion 37 is not interposed, the dissimilar metals 201 and 10 on the rear side are in direct contact with each other to conduct electricity. Enables electrical communication. For this reason, the cause of inducing the occurrence of electrolytic corrosion between dissimilar metals can be eliminated at the tip of the aluminum core wire 201 regardless of the presence of moisture. Owing to this insulating action, the occurrence of electrolytic corrosion can be prevented.

  Therefore, even if the front end side of the aluminum core wire 201 is open, an electrolytic corrosion preventing function can be obtained. Therefore, as shown in FIG. 4 (e), it is not necessary to seal the front end side of the aluminum core wire 201. A crimping step of crushing the barrel piece 32 surrounding the distal end surface side and sealing the distal end side of the aluminum core wire 201 can be omitted.

  Thereby, the water stop at the front end side of the aluminum core wire 201 is not required, and the water stop structure can be omitted. For this reason, the local crimping | compression-bonding process which crushes and seals the edge part of the barrel piece 32 after the whole crimping | compression-bonding with respect to the outer peripheral surface of the covered electric wire 200 can be abbreviate | omitted. Therefore, it is possible to ensure highly reliable electrolytic corrosion prevention that is not affected by the degree of deformation caused by crushing the barrel piece 32 and is not affected by the water stop performance.

  Further, since a space for crimping (crushing portion) on the tip side of the barrel piece of the crimping portion 30 is not required between the box portion 20 and the crimping portion 30 of the female crimp terminal 10, It is also possible to adopt a configuration in which the transition portion 20 a is not provided between the crimp portion 30. In this case, since the open space by the transition part 20a is not formed, it becomes difficult for moisture to enter the tip side of the aluminum core wire 201 from the outside.

  Further, even if moisture enters the tip side of the aluminum core wire 201 continuous with the transition portion 20a, it can be discharged to the outside through the drain hole 34 opened at the bottom thereof, so that an excessive water blocking measure against moisture is required. The production is simplified.

Therefore, in the crimped connection structure 1 having such a function, the front end surface side of the aluminum core wire 201 is exposed, but the front end portion of the aluminum core wire 201 is surrounded by the insulating coating portion 37 to prevent electric corrosion. Therefore, the cause of the occurrence of electrolytic corrosion that corrodes the surface on the front end side of the aluminum core wire 201 can be fundamentally solved.
In addition, the insulating coating portion 37 formed on the tip side of the crimping portion 30 not only has an insulating function, but also intervenes between different kinds of metals in the circumferential direction, and at the same time provides water-stopping properties. Moisture does not enter the side.

On the other hand, since the insulating coating portion 37 is not formed on the rear side of the insulating coating portion 37, the dissimilar metal surfaces of the female crimp terminal 10 and the aluminum core wire 201 are pressure-bonded and reliably contacted to provide stable conductivity. Sex is obtained.
As a result, in the crimping part 30, the electrical corrosion prevention performance on the front side that insulates between the female crimp terminal 10 and the aluminum core wire 201 and makes the two metal surfaces non-contact, and the female crimp terminal 10 and the aluminum core wire The performance which contradicts with the conduction performance in the back side which contacts 201 can be made compatible.

  In particular, in the crimping portion 30 in the longitudinal direction from the distal end portion of the aluminum core wire 201 to the distal end side covering portion, the facing gap with the barrel piece 32 is different. Adjustment is also unnecessary.

In the above description, the aluminum core wire 201 is used as the wire conductor, but a copper alloy core wire made of a general copper alloy wire may be used.
Furthermore, a plurality of serrations in the width direction Y (see Example 2) may be formed in parallel on the inner surface of the surrounding surface 30A corresponding to the wire crimping range 30a. In this case, when the aluminum core wire 201 is pressure-bonded, the aluminum core wire 201 bites into the serration and can improve the pressure-bonding property.

  Further, as shown in FIG. 5A, as the female crimp terminal 10 of another pattern, not only the insulating coating portion 37 is provided on the surrounding surface 30A of the female crimp terminal 10, but also the rectangular planes 33 on both sides, A longitudinal seal 35 for water stop formed in a strip shape may be provided in at least one longitudinal direction of 33.

In this case, in addition to the electrolytic corrosion preventing function by the insulating coating portion 37, the water stoppage between the rectangular flat surfaces 33 facing each other at the central top portion in the width direction of the crimping portion 30 can be increased.
Further, since the position where the longitudinal seal 35 is interposed is a flat portion, it is easy to intervene uniformly. For example, a sheet-like water-stopping member can press the space between the crimping surfaces more uniformly from the left and right. Sealability is obtained.

  Furthermore, as shown in FIG. 5B, as the female crimp terminal 10 of another pattern, not only is the insulating coating portion 37 provided on the surrounding surface 30A of the female crimp terminal 10, but also the longitudinal direction of the surrounding surface 30A. A water stop rear width direction seal 36 formed in a strip shape in the width direction on the rear end side may be provided.

In this case, in addition to the electric corrosion prevention function by the insulating coating portion 37, the front end side covering portion is sealed and crimped without gaps by the rear width direction seal 36, so that the water stoppage at the rear side of the crimp portion 30 is further improved. It can certainly be increased.
Furthermore, a seal for water stop may be provided so as to wrap the longitudinal direction seal 35 shown in FIG. 5A and the rear width direction seal 36 shown in FIG.

  Further, the length, width, shape, thickness, etc. of the longitudinal seal 35 and the rear width seal 36 may be appropriately set according to the diameter and material of the female crimp terminal 10 and the covered electric wire 200. Further, the material of the longitudinal seal 35 and the rear width direction seal 36 may be appropriately set according to the diameter and material of the female crimp terminal 10 and the covered electric wire 200.

A connector 3 (3a, 3b) having reliable conductivity and electrolytic corrosion resistance can be configured by mounting the crimp connection structure 1 using the female crimp terminal 10 to the connector housing 300. it can.
In the following description, an example in which both connectors 3 (3a, 3b) are connectors of a wire harness is shown, but one may be a connector of a wire harness and the other may be a connector of an auxiliary machine such as a board or a component.

  Specifically, as shown in FIG. 6, as shown in the perspective view of the connector 3 to which the crimp connection structure 1 is attached, the crimp connection structure 1 constituted by the crimp terminals 10 is attached to the female connector housing 300. The wire harness 301a provided with the female connector 3a is comprised.

  And the crimping connection structure 1 comprised with the male crimp terminal which is not shown in figure is mounted | worn with the male connector housing 300, and the wire harness 301b provided with the male connector 3b is comprised. And the wire harness 301a and the wire harness 301b can be connected by fitting the female connector 3a and the male connector 3b.

  At this time, since the crimp connection structure 1 in which the crimp terminal and the covered electric wire 200 are connected is mounted on the connector housing 300, connection of the wire harness 301 (301a, 301b) having reliable conductivity is realized. can do.

Next, the second pattern female crimp terminal 10a will be described.
7 shows a perspective view of the second pattern female crimp terminal 10a, and FIG. 8 shows an explanatory view of the second pattern female crimp terminal 10a. Specifically, FIG. 8 (a) shows a side view of the female crimp terminal 10a, FIG. 8 (b) shows a longitudinal sectional view at the center in the width direction of the female crimp terminal 10a, and FIG. 8 (c) shows the female mold. The rear view of the crimp terminal 10a is shown. Moreover, FIG.8 (d) shows the longitudinal cross-sectional view in the width direction center of the crimping | bonding connection structure 1a, FIG.8 (e) has shown the AA arrow directional cross-sectional view of FIG.8 (d).

  FIG. 9 shows an explanatory view of the chain terminal 110 constituting the female crimp terminal 10a of the second pattern. Specifically, FIG. 9A shows a plan view of the copper alloy strip 100 forming the chain terminal 110 when the inner surface of the female crimp terminal 10a is arranged on the front side, and FIG. The top view of the copper alloy strip 100 which forms the chain terminal 110 at the time of arrange | positioning so that the outer surface of the type | mold crimp terminal 10a may become a back side is shown.

  10A and 10B are perspective views for explaining the crimping of the covered electric wire 200 by the crimping portion 30 in the crimping connection structure 1a. FIG. 11A is a perspective view showing a state before the crimping, and FIG. The perspective view of the comprised crimped connection structure 1a is shown.

  The female crimp terminal 10a has the same configuration as the female crimp terminal 10 described in the first embodiment. Therefore, only a different point from the female crimp terminal 10 of Example 1 is demonstrated, the part of the same structure attaches | subjects the same code | symbol, and abbreviate | omits the description.

First, four serrations 73 that are grooves in the width direction Y that the aluminum core wire 201 bites into the inner surface of the wire crimping range 30a of the surrounding surface 30A in a state where the aluminum core wire 201 is crimped are parallel to the longitudinal direction X. Forming.
In addition, the serration 73 is formed in the groove | channel shape which continues from the crimping | compression-bonding bottom face 31 and the upper part of the barrel piece 32 extended diagonally outward upwards from the both sides of the width direction Y of the crimping | compression-bonding bottom face 31.

  Further, the surrounding surface 30A has a width direction seal 71 formed in a band shape in the width direction Y at the rear end portion in the longitudinal direction X, and an end portion in the width direction Y on the inner surface of the left barrel piece 32a and the outer surface of the right barrel piece 32b. And a belt-like longitudinal seal 72 (72a, 72b) in the longitudinal direction X.

  Also in this case, since the surrounding coating 30A is covered with the insulating coating portion 37, after the crimping, the enclosed insulating coating portion 37 is interposed between the dissimilar metals of the aluminum core wire 201 and the female crimp terminal 10, and between the two. Insulating function is obtained. By this insulating action, an electrolytic corrosion preventing function for preventing electrolytic corrosion is obtained as in the first embodiment.

  Thus, by providing the insulating coating part 37, even if the front end side of the aluminum core wire 201 is open, an electrolytic corrosion preventing function can be obtained. For this reason, as shown in FIG. 10, it is not necessary to seal the tip end side of the aluminum core wire 201, and the tip end side of the aluminum core wire 201 continuous with the transition portion 20 a that is a joint portion between the box portion 20 and the crimping portion 30. A crimping process that requires sealing of the circular opening portion on the distal end side of the aluminum core wire 201 can be omitted with respect to the circular opening portion. That is, it is not necessary to crush the tip of the barrel piece 32 that continues to the transition portion 20a.

  Further, the rear width direction seal 71 is in close contact with the outer peripheral surface of the insulating coating portion 202 to ensure water-stopping, and the rear width direction seal 71 is preferably made of a material having rubber properties, and among them, alkali resistance As a result of repeated studies from the viewpoint of heat resistance, silicon rubber, fluorine rubber, butyl rubber, butadiene rubber, ethylene propyl rubber, nitrile rubber, and the like are suitable.

Further, the rear width direction seal 71 is preferably made of a material having low hardness and elasticity. Also, from the viewpoint of the workability of crimping at the crimping portion 30 and the ease of attachment to the copper alloy strip 100 described later, the thickness of the rear width direction seal 71 is a female crimping in the state before the crimping by the crimping portion 30. It is desirable that the thickness of the copper alloy strip 100 (FIG. 9) constituting the terminal 10a is about the plate thickness, and it should be 1/3 or more and 3 times the plate thickness.
In each figure, for convenience, the thickness of the female crimp terminal 10a is increased, and the width direction seal 71 and the longitudinal direction seal 72 are shown without thickness.

  Moreover, since the longitudinal direction seal | sticker 72 (72a, 72b) is formed in the part of the superimposition part D which the barrel pieces 32 contact, as mentioned later, it is comprised with the back width direction seal | sticker 71 and the same material. .

  As shown in FIG. 9, the female crimp terminal 10a having such a configuration has a water-stop seal 70 (70a, 70) that forms a width direction seal 71 and a longitudinal direction seal 72 (FIGS. 7 and 8) on the front and back surfaces, respectively. 70b), and further, the chain terminal 110 formed by punching a copper alloy strip 100 having a predetermined width provided with an insulating coating portion 37 on the surface 100a into a terminal shape is subjected to a bending process.

  Specifically, a water-stop seal 70a is provided on the surface 100a constituting the inner surface of the female crimp terminal 10a in the reflow tin-plated copper alloy strip 100 at locations corresponding to the width direction seal 71 and the inner surface side longitudinal seal 72a. The water stop seal 70b is applied to the corresponding portion of the outer surface side longitudinal seal 72b on the back surface 100b that is provided and constitutes the outer surface of the female crimp terminal 10a.

  In this way, the chain terminal 110 is punched out from the copper alloy strip 100 on which the insulating coating portion 37 and the water-stop seal 70 are formed, and bent to form the female crimp terminal 10a. The crimping connection structure 1a is configured by crimping 200 (FIGS. 7 and 8). Specifically, the electric wire exposed portion 201a of the aluminum core wire 201 exposed on the front end side of the insulating coating portion 202 of the covered electric wire 200, the position in the longitudinal direction X of the front end 201b of the electric wire exposed portion 201a is from the insulating coating portion 37 in the crimping portion 30. The covered electric wire 200 is arranged in the crimping part 30 so as to be behind.

And from the front-end | tip 201b of the electric wire exposure part 201a to the back from the coating | coated front-end | tip 202a of the insulation coating part 202, as shown in FIG.
At this time, the end portion in the width direction Y of the left barrel piece 32a is overlapped on the end portion in the width direction Y of the right barrel piece 32b by the first crimper jig (not shown) so as to form the overlapping portion D. Next, the barrel piece 32 is wound around the wire exposed portion 201a of the aluminum core wire 201 and the insulation coating portion 202 and is crimped.

  Furthermore, the front end portion of the barrel piece 32 is in close contact with the crimping bottom surface 31 via the insulating coating portion 37, the wire crimping range 30a is in close contact with the wire exposed portion 201a, and the covering portion crimping range 30b is the covering tip 202a. The second crimper jig (not shown) is used so as to tightly contact the outer periphery of the insulating coating part 202 via the rear width direction seal 71, and the crimping of the barrel piece 32 is strengthened, and the female crimping by the crimping part 30 is performed. The terminal 10a and the covered electric wire 200 are connected to form the crimp connection structure 1a.

  In this case, the electric corrosion prevention function is enhanced by using both the insulating property by the insulating coating portion 37 and the water-stopping property by the rear width direction seal 71, the inner surface side longitudinal seal 72a, and the outer surface side longitudinal seal 72b. Yes. That is, after crimping, an insulating coating portion 37 that surrounds the tip end portion of the aluminum core wire 201 with a predetermined width length is interposed in a facing portion between the aluminum core wire 201 and the female crimp terminal 10, and the intervening insulating coating portion 37 is different. It is possible to insulate the metal so as not to be electrically connected.

  Specifically, an insulating coating portion 37 is provided at a position where the tip of the aluminum core wire 201 and the female crimp terminal 10 are in direct contact with each other so that moisture that causes electric corrosion does not adhere. . As a result, since different metals are separated from each other by a distance, even if moisture adheres to the portion as water droplets, the adhered water droplets adhere as “aluminum core wire 201, water droplets, insulating coating portion 37” or “female type” Attached as the crimp terminal 10, water droplets, insulating coating portion 37 ".

  For this reason, since moisture does not come into contact with the other, the electrical conduction between the aluminum core wire 201 and the female crimp terminal 10 is partitioned by the insulating coating portion 37, and the non-conductive state is established between the dissimilar metals 201 and 10. it dose not connect. Thereby, the fundamental cause of electrolytic corrosion can be eliminated and electrolytic corrosion can be reliably prevented.

  In addition, since the other crimp connection parts are crimped, moisture does not enter. Further, behind the position on the front end side where the insulating coating portion 37 having a predetermined width and length is annularly formed, since the insulating coating portion 37 is not interposed, the dissimilar metals 201 and 10 at the rear are in direct contact with each other. And conducting electrical communication. For this reason, the cause which induces the generation | occurrence | production of the electrolytic corrosion between the dissimilar metals 201 and 10 can be eliminated in the front-end | tip part of the aluminum core wire 201 irrespective of presence of moisture. That is, the occurrence of electrolytic corrosion can be reliably prevented by the insulating action.

  Therefore, even if the front end side of the aluminum core wire 201 is open, an electric corrosion prevention function can be obtained. Therefore, as shown in FIG. 10, it is not necessary to seal the front end side of the aluminum core wire 201. It is possible to omit a crimping step that requires sealing of the opening portion continuous with the transition portion 20a. As a result, it is possible to reduce the manufacturing cost of the crimped connection structure 1a and reduce the cost.

  Thereby, the water stop in the transition part 20a is no longer required, and the water stop structure can be omitted. For this reason, the transition part 20a may remain open after crimping, and the process of further crushing and sealing the end of the barrel piece 32 with respect to the opening part of the transition part 20a after crimping can be omitted. For this reason, it is not affected by the degree of deformation caused by crushing the barrel piece 32, and it is possible to ensure highly reliable electrolytic corrosion prevention that is not affected by the water stop performance.

  Further, depending on the direction in which the crimp connection structure 1a is attached, the water that has entered the transition portion 20a is provided with a drain hole 34 so that the water does not collect at the bottom thereof, so that the water can be naturally discharged to the outside. .

  Further, as shown in FIG. 8E, the overlapping portion D is formed so that the end in the width direction Y of the left barrel piece 32a overlaps the end in the width direction Y of the right barrel piece 32b. The inner surface side longitudinal seal 72a formed on the inner surface of the end portion in the width direction Y of the left barrel piece 32a and the outer surface side longitudinal seal 72b formed on the outer surface of the end portion in the width direction Y of the right barrel piece 32b are in close contact with each other. To do. Accordingly, it is possible to ensure the water-stopping property of the overlapping portion D in the longitudinal direction in the crimping portion 30.

  Further, as shown in FIGS. 8D and 8E, since the covering portion crimping range 30 b is in close contact with the outer periphery of the insulating covering portion 202 via the rear width direction seal 71, the rear width direction seal 71 causes the crimp portion 30. It is possible to ensure the water stoppage on the rear end side.

  Therefore, when the crimp connection structure 1 a having such a function is used, the insulating coating portion 37 is applied to the front end side of the crimp portion 30. That is, an electrolytic corrosion prevention structure that reduces the number of crimping steps can be obtained by securing an insulating means that can eliminate the need for a water stop means. Thereby, manufacture of the crimp connection structure 1a becomes easy. Moreover, if the seal | sticker 71, 72a, 72 is given with respect to the rear-end side in the crimping | compression-bonding part 30, a water-stopping property will be raised further and the electrolytic corrosion prevention effect will increase more.

  Furthermore, although the opposing gap between different metals is large on the front end side of the crimping portion 30, a function of preventing electrolytic corrosion due to the intervening insulating coating portion 37 that is not affected by the size of the opposing gap can be obtained. Moreover, since the opposing gap between dissimilar metals is small on the rear end side of the crimping part 30 and water can be stopped efficiently by the rear width direction seal 71, a stable electrolytic corrosion preventing function can be obtained. Thus, electric corrosion prevention suitable for the opposing gap between different kinds of metals on the front and rear end sides of the crimping portion 30 is performed.

  In particular, when crimping with the barrel piece 32, it is possible to perform crimping corresponding to the stepped shape of the covered electric wire 200 having different sizes in the radial direction between the aluminum core wire 201 and the insulating coating portion 202. Correspondingly, it is configured so that prevention of electrolytic corrosion can be obtained. Moreover, in the intermediate part of the crimping | compression-bonding part 30 in the longitudinal direction X, the stable contact between dissimilar metals can be ensured, and since there is no fear of electrolytic corrosion, it can prevent that electroconductivity falls.

  By the way, the aluminum core wire 201 is made of aluminum which is a base metal compared to the copper alloy strip 100 constituting the female crimp terminal 10a, and moisture is present at the contact portion between the female crimp terminal 10a and the aluminum core wire 201. It is possible to prevent the occurrence of electrolytic corrosion caused by the adhesion.

  Therefore, it is possible to configure the crimp connection structure 1a having a connection state in which stable conductivity is ensured in the female crimp terminal 10a and the aluminum core wire 201. And also in the case of the crimp connection structure 1a comprised using the female crimp terminal 10a in this way, the same electric corrosion prevention effect as the crimp connection structure 1 using the female crimp terminal 10 is obtained. Can do.

In the above description, the aluminum core wire 201 is used as the wire conductor, but a copper alloy core wire made of a general copper alloy wire may be used.
Further, the inner surface side longitudinal seal 72a and the outer surface side longitudinal seal 72b are formed at the respective width direction end portions of the left barrel piece 32a and the right barrel piece 32b constituting the overlapping portion D, but the inner surface side longitudinal seal 72a. And at least one of the outer surface side longitudinal seals 72b.

  Next, the third pattern female crimp terminal 10b will be described. The female crimp terminal 10b of the third pattern has the same configuration as the female crimp terminal 10 described in the first embodiment and the female crimp terminal 10a described in the second embodiment. Therefore, only different points will be described, the same components are denoted by the same reference numerals, and the description thereof is omitted.

  In the third pattern female crimp terminal 10b, as shown in FIG. 11A, the barrel piece 32 of the crimp part 30 is formed to have substantially the same length as the outer periphery of the wire exposed part 201a and the outer periphery of the insulating coating part 202. Has been. In addition to the rear width direction seal 111 in the female crimp terminal 10 described above, a side end face seal 112 is provided on the side end face 38 in the width direction Y of the barrel piece 32. The side end face seal 112 is made of the same material as the rear width direction seal 111.

  11A is a perspective view of the third pattern female crimp terminal 10b, and FIG. 11B is a perspective view of a crimp connection structure 1b configured by caulking the wire exposed portion 201a at the crimp portion 30. FIG. Is shown. FIG. 12 is an explanatory view of the third pattern female crimp terminal 10b. 12A shows a side view of the female crimp terminal 10b, FIG. 12B shows a longitudinal sectional view at the center in the width direction of the female crimp terminal 10b, and FIG. 12C shows the female crimp terminal 10b. FIG. Moreover, FIG.12 (d) shows the longitudinal cross-sectional view in the width direction center of the crimping | bonding connection structure 1b, FIG.12 (e) has shown the AA arrow directional cross-sectional view of FIG.12 (d).

  The female crimp terminal 10b having such a configuration is similar to the description in FIG. 9, in which a copper alloy strip 100 having a predetermined width provided with an insulating coating portion 37 and a water stop seal 70 on the surface is punched into a terminal shape to form a chain terminal 110. , A bending process, and a cutting process.

  Thus, the chain terminal 110 is punched out from the copper alloy strip 100 on which the insulating coating portion 37 and the water stop seal 70 are formed, and bent to form the female crimp terminal 10b. The covered electric wire 200 is disposed in the crimping portion 30 so that the position in the longitudinal direction X of the tip 201b of the exposed portion 201a is behind the insulating coating portion 37 in the crimping portion 30, and the covered electric wire 200 is crimped by the crimping portion 30. Thus, the crimp connection structure 1b is configured.

  At this time, the side end surface 38 of the left barrel piece 32a and the side end surface 38 (FIG. 11A) of the right barrel piece 32b are connected to the electric wire exposed portion 201a and the insulating coating portion 202 by a crimper not shown. Crimp in a state of being in contact with each other.

In this state, since the end portion on the front side of the barrel piece 32 is in close contact with the crimping bottom surface 31 via the insulating coating portion 37, the insulating coating portion 37 ensures the electric corrosion prevention property on the tip side of the crimping portion 30. Can do.
Further, as shown in FIG. 12 (e), the side end face 38 of the left barrel piece 32a and the side end face 38 of the right barrel piece 32b are brought into contact with each other to be in close contact with each other. It can be ensured by the side end face seal 112.

Furthermore, as shown in FIGS. 12D and 12E, the covering portion crimping range 30 b is in close contact with the outer periphery of the insulating covering portion 202 via the rear width direction seal 111. It is possible to ensure the water stoppage on the rear end side.
Therefore, the crimp connection structure 1b configured using the female crimp terminal 10b in this way has the same effect of preventing electric corrosion as the crimp connection structure 1 and 1a using the female crimp terminals 10 and 10a. Obtainable.

In addition, although the side end surface seal | sticker 112 was formed in the both-sides end surface 38 of the left barrel piece 32a and the right barrel piece 32b, you may form only in any one.
In addition to the rear width direction seal 111, as a female crimp terminal 10b of another pattern, on the outer surface of the pressure bonding portion 30, the length between the longitudinal direction X of the insulating coating portion 37 and the rear width direction seal 111 is longer. A water stop seal may be provided so as to wrap in the direction X.

Furthermore, the length, width, shape, thickness, etc. of the width direction seal, the longitudinal direction seal, or the water seal attached to the outer surface of the crimping portion 30 are the diameter and material of the female crimp terminal 10b and the covered electric wire 200. What is necessary is just to set suitably according to.
Further, the material of the water stop seal attached to the outer surface of the rear width direction seal 111, the side end face seal 112, or the crimping portion 30 is also set as appropriate according to the diameter and the material of the female crimp terminal 10b and the covered electric wire 200. do it.

The crimp connection structure 1b using the female crimp terminal 10b described in the third embodiment uses the crimp connection structure 1 configured in the first embodiment and the female crimp terminal 10a described in the second embodiment. It is used with the same electric corrosion prevention function as the crimped connection structure 1a.
That is, by mounting these crimp connection structures 1, 1a (1b) on the connector housing 300 as shown in FIG. 6, the connector 3 (3a, 3b) having reliable conductivity can be configured. it can.

  As mentioned above, when crimping with a barrel piece, it can be crimped according to the stepped shape of the covered wire with different sizes in the radial direction between the aluminum core wire and the insulation coating part, so it corresponds to both material and shape Thus, the electric corrosion prevention is obtained. For this reason, the electric corrosion prevention structure which aimed at reduction of the crimping man-hour is obtained, and manufacture of a crimping connection structure becomes easy. Further, if sealing is performed not only on the insulating coating portion but also on the rear end side of the barrel piece, the water-stopping property is further enhanced, and the effect of preventing electrolytic corrosion is further enhanced.

In the correspondence between the configuration of the present invention and the above-described embodiment, the wire conductor and the aluminum wire conductor of the present invention correspond to the aluminum core wire 201,
Similarly,
The covering corresponds to the insulating covering portion 202,
The tip of the covering corresponds to the covering tip 202a,
The predetermined length corresponds to the exposure length Xw,
The exposed portion of the wire conductor corresponds to the wire exposed portion 201a,
Crimp terminals correspond to female crimp terminals 10, 10a, 10b,
The electrolytic corrosion preventing means corresponds to at least one of the insulating means and the water stopping means,
The insulating means corresponds to the insulating coating portion 37,
The water stop means corresponds to the width direction seal 71, the longitudinal direction seals 35 and 72, the inner surface side longitudinal direction seal 72a, the outer surface side longitudinal direction seal 72b, the rear width direction seals 36 and 111, and the side end surface seal 112,
The overlapping portion corresponds to the overlapping portion D,
The width direction end surface corresponds to the side end surface 38,
The connection structure corresponds to the crimp connection structure 1, 1a, 1b,
The connectors correspond to connector 3, female connector 3a and male connector 3b.
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

For example, in the above-described embodiment, the drain hole 34 is provided near the bottom of the insulating coating portion 37. However, the drain hole 34 is not limited to this, and the drain hole is taken into account in consideration of the use and installation environment of the crimped connection structure 1, 1a, 1b. You may comprise without providing 34. FIG.
Furthermore, although water has been shown as an example of an electrolytic solution between different metals, the same applies to a liquid that is an electrolytic solution such as seawater and oil.

DESCRIPTION OF SYMBOLS 1, 1a, 1b ... Crimp connection structure 3 ... Connector 3a ... Female connector 3b ... Male connector 10, 10a, 10b ... Female crimp terminal 30 ... Crimp part 30A ... Surrounding surface 32 ... Barrel piece 34 ... Drain hole 35, 72, 72a, 72b ... Longitudinal seals 36, 71, 111 ... Width direction seal 37 ... Insulating coating portion 38 ... Side end surface 112 ... Side end surface seal 201 ... Aluminum core wire 201a ... Electric wire exposed portion 202 ... Insulating coating portion 300 ... Connector housing D ... Overlapping portion Xw ... Exposure length X ... Longitudinal direction Y ... Width direction

Claims (14)

A barrel piece constituting a crimping portion that surrounds and crimps an exposed portion of the wire conductor that is exposed for a predetermined length from the tip of the covering body in a covered electric wire in which the outer periphery of the wire conductor is covered with an insulating covering body, Crimp terminals provided on both sides of the direction,
The barrel piece,
It is composed of a different kind of conductive different metal from the wire conductor, and is formed longer in the longitudinal direction than the length of the exposed portion of the wire conductor,
An electrolytic corrosion preventing means is provided on at least a part of the surrounding surface in the crimping part,
The crimping part is
A crimp terminal that is crimped by the barrel piece so as to continuously and integrally surround from the tip side of the wire conductor to the tip side covering portion of the covering body. The electric corrosion prevention means,
The at least one part of the front end side in the surrounding surface of the said crimping | compression-bonding part surrounding the front-end | tip part of the said electric wire conductor is comprised by the insulation means of the width direction interposed between this surrounding surface and the said electric wire conductor. Crimp terminal. The crimp terminal according to claim 2, wherein a drain hole is formed in the vicinity of the bottom surface of the barrel piece to which the insulating means is applied. The electric corrosion prevention means,
The crimp terminal according to any one of claims 1 to 3, wherein the crimp terminal includes a water stop means for stopping the width direction at least at a part of the rear end side in the longitudinal direction of the surrounding surface. In the pressure-bonding portion in the crimped state, the width direction end portion on the surrounding surface side of one barrel piece and the width direction end portion on the surrounding surface side of the other barrel piece are opposed from both sides, and the facing portion of the barrel piece is elongated. The crimp terminal according to any one of claims 1 to 4, wherein the crimp terminal is configured to be crimped so as to face each other across a direction. The crimp terminal according to claim 5, wherein the water stop means is formed on at least one plane facing side of the barrel piece. In the pressure-bonding portion in a pressure-bonded state, a width direction end portion of one barrel piece covers an outer end portion of the width direction end portion of the other barrel piece, and a longitudinal overlapping portion where the end portions overlap each other is formed. The crimp terminal according to any one of 1 to 4. The crimp terminal according to claim 7, wherein the water stop means is formed on at least one of the opposing portions in the vicinity of the end portion in the width direction of the barrel piece forming the overlapping portion. The crimp terminal according to any one of claims 1 to 4, wherein in the crimped portion in a crimped state, the end surfaces in the width direction of both barrel pieces abut each other. The crimp terminal according to claim 9, wherein the water stop means is formed on at least one width direction end face of the width direction end faces of the barrel pieces. The connection structure which connected the said covered electric wire and the said crimp terminal by the crimp part in the crimp terminal of any one of Claims 1 thru | or 10. The connection structure according to claim 11, wherein the wire conductor is arranged and connected so that a tip end of the wire conductor is located at an intermediate position in the longitudinal direction of the crimping portion. The connection structure according to claim 11 or 12, wherein the electric wire conductor in the covered electric wire is composed of an aluminum electric wire conductor. The connector which has arrange | positioned the crimp terminal in the connection structure of any one of Claim 11 thru | or 13 in the connector housing.

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