JPH08115756A - Connecting structure and connecting method of wire - Google Patents

Abstract

PURPOSE: To provide a connecting structure for wire in which the conductor of a wire can be easily and surely connected to a terminal to improve the reliability and reduce the cost in the manufacturing process. CONSTITUTION: A conductor 9 exposed by pushing a wire 8 into a pressure contact edge formed into reversed V-shape, thereby cutting a covering 10 is connected to the pressure contact edge 22 in such a manner as to be capable of carrying a current. A contact projection 23 provided on the base part of the pressure contact edge 22 is brought into contact with the exposed conductor 9, and the contact projection 23 is, for example, laser-welded to the conductor 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire connection structure suitable for applying a covered electric wire to a connection terminal or a bus bar so as to be electrically conductive.

[0002]

2. Description of the Related Art Taking an automobile as an example, sensors and electronic devices are mounted for various controls, and the sensors and the electronic devices are interconnected or branched by a wire harness. . Therefore, connection terminals and the like are often used for connecting electronic devices and electric wires. There are various types of connection terminals such as crimp terminals and pressure contact terminals,
An example of the conventional connection terminal disclosed in Japanese Patent Laid-Open No. 2-310876 will be described below with reference to FIGS.

The crimp terminal 1 disclosed in the above publication is provided by bending and punching a thin plate of brass or the like, has an electric connecting portion 2 at one end, and an electric wire crimping portion 3 at the other end. It is configured to have. Furthermore, the wire crimping portion 3 is composed of a conductor crimping portion 4 and a coating crimping portion 5 for insulating coating. The conductor crimping portion 4 includes a pair of caulking portions 4a and a bottom plate portion 4
and b, it is formed in a transverse U-shape, and a pair of caulking portions 4a are provided with exposed welding portions 6 in a streak pattern. The conductor crimping portion 4 crimps the conductor 9 of the electric wire 8 so that it can be energized,
Holds the electric wire 8 integrally by crimping the outer surface of the covering 10 of the electric wire 8.

An electric wire 8 is connected to the crimp terminal 1 having the above structure by the crimping method described below. That is, the electric wire 8 is positioned in the electric wire crimping portion 3 with the conductor 9 exposed after the coating 10 is peeled off at the end portion. Next, pressure is applied from the vertical direction indicated by the arrow by the crimp jigs 11 and 12, and the crimp portion 4a and the cover crimp portion 5 are crimped. Further, the crimp terminal 1 has a pair of caulking portions 4 as shown in FIG.
Laser light generated from the laser generator 13, for example, is emitted from the exposed welding portion 6 opened between a and 4b.
As a result, the conductor 9 and the terminal 1 were partially melted at the laser-irradiated portion, so that the electric wire 8 could be connected to the terminal 1 while being mechanically and electrically reinforced together with the pressure-bonding action.

Further, as the connection terminal, an electric wire (not shown) is pressed into the U-shaped slot A formed in, for example, two sets of pressure contact blades 18 and 19 as shown in FIG. Then, there is a so-called pressure contact terminal 17, which cuts the coating of the electric wire and connects the conductor and the pressure contact blades 18 and 19 so as to be able to conduct electricity. In particular, in such a pressure contact terminal 17, peeling work and caulking work of the electric wire coating can be made unnecessary and the working process can be reduced, but on the other hand, since the holding force against the pulling out of the electric wire is weak, various means have been taken. As a means,
There is one in which the conductor portion divided by the slot A and the surface of the slot A are welded. However, when the present inventor examined the connection structure of each electric wire in detail, it was found that there were the following problems.

[0006]

That is, in the former crimp terminal structure, as described above, it is necessary to remove the coating, which complicates automation or diversification, and especially when laser irradiation is performed. As shown by the broken line in FIG. 10, electric discharge was generated between the plural twisted wires forming the conductor, and the irradiated part was melted and disappeared, and the electric wire connection became unstable. In the latter case, the connection between the conductor and the pressure contact terminal is made only by the thin end face of the pressure contact blade, which naturally causes high contact resistance, which is not preferable. Furthermore, when attempting to weld between the conductor and the slot surface, the exposed conductor and slot surface are so small that the work may become unstable and even the coating of the connection point may be melted. .

An object of the present invention is to provide a simple and reliable connection between a covered electric wire and a terminal or the like, which has high reliability, and
An object of the present invention is to provide an electric wire connection structure and a connection method capable of achieving cost reduction due to high productivity.

[0008]

In order to achieve the above object, an electric wire connection structure according to the present invention is provided with a vertical portion provided with a substantially U-shaped slot and a continuous portion connected to the vertical portion and press-fitted into the slot. The pressure-contact blades having a pair of inclined surface portions that are open in the opposite directions to expose the conductor by spreading the coatings of the covered electric wires away from each other, and projecting upward from the end of the slot and located between the inclined surface portions. And a contact protrusion with which the exposed conductor of the covered electric wire abuts, and the conductor is welded to the contact protrusion. Further, the contact protrusion may be provided with a cut or a through hole, and the conductor of the covered electric wire and the contact protrusion and the pressure contact blade are soldered through the cut or the through hole. Further, a method of connecting an electric wire according to the present invention to achieve the above object is to provide a vertical portion provided with a substantially U-shaped slot and a coating of a coated electric wire which is continuous with the vertical portion and press-fitted into the slot. A pair of pressure contact blades having a pair of inclined surface portions that open in the opposite direction to expose the conductor by spreading in a separating direction, and the covered electric wire that is located between the inclined surface portions and projects upward from the end of the slot. A contact projection with which the conductor abuts, the covered electric wire is press-fitted into the slot to bring the exposed conductor into contact with the contact projection, and welding is performed by laser irradiation from the back surface side of the contact projection. To do.

[0009]

When the electric wire is pushed into the press contact blade by introducing the press contact terminal, the coating is split by the slot of the press contact blade so that the conductor and the terminal can be electrically connected. Further, by bringing a conductor composed of a plurality of core wires into contact with a contact protrusion provided at a position corresponding to the base of the slot, the conductor is distributed so as to be separated, and contacted with the inclined outer surface of the contact protrusion. . In such a state, when the non-contact welding is performed by irradiating the laser from the back side which is the inner side of the contact protrusion, the conductor is welded to the contact protrusion and the terminal to realize the electrical connection under low resistance. . Further, even if a cut or a through hole is formed in the contact protrusion, solder is introduced through the cut or through hole, and the conductor and the contact protrusion are soldered, the same electrical connection can be realized.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of an electric wire connection structure to which the present invention is applied will be described below with reference to FIGS. In the description of the embodiments, the structure of the connection structure will be described with reference to FIGS. 1 and 2, and the electric wire connection method will be described with reference to FIGS. 3 to 5. The erroneous insertion preventing action will be described with reference to FIGS. The terminal structure to which the present embodiment is applied, that is, the structure of the electric connecting portion in the crimp terminal in the conventional example is not particularly limited, and the structure of the electric connecting portion may be directly used. You may apply the male terminal or female terminal called among traders. It can also be applied to a bus bar or the like that is applied when it is inserted into a connector to form, for example, a shunt circuit. Therefore, in the embodiments described below, the illustration and description of the electrical connection portion are omitted.

To summarize the structure of the connection structure 21, as shown in FIG. 1, an inverted Y-shaped pressure contact blade 22 formed by closely adhering two metal plates and a contact formed at the base of the pressure contact blade 22. And the projection 23. It should be noted that the shape of the press-contact blade 22 in the assembled state looks as if it was formed by closely adhering two metal plates, but in reality, as shown in FIG. Since it is formed by bending, it is one conductor when viewed from the point of energization.

For convenience of description, the configuration at the time of development will be described below with reference to FIG. 2. One metal plate A is, for example, a brass plate die-cut, and has a strip-shaped base 25.
A set of molds 26 that become pressure contact blades 22 by bending on both sides of the
Are formed in point symmetry around the base 25.
Each die 26 is continuously provided via a bending margin 26a formed between the die 26 and the base portion 25, and each die 26 has a slot 26 having a press-contact width substantially matching the wire diameter of the covered electric wire 8 to be covered.
c is provided. In addition, the slot 26 introduction portion,
Guide part 2 opened to the outside to facilitate fitting of the electric wire 8
6b are formed. In addition, each mold 26 on the base 25
When the press contact blade 22 is formed by bending the press contact blade 22, the press contact blade 22 is pressed at a base position corresponding to the lower part of the press contact blade 22.
A conical contact protrusion 23 protruding to the side is formed. Note that the electrical connection portion described in the conventional structure is, for example, the base portion 25.
To the left, and the wire crimping portion carrying the wire is formed, for example, to the right.

The pressure contact blade 22 is formed by bending the mold 26. Returning to FIG. 1, the pressure contact blade 22 formed by bending the mold 26 will be further described.
2 is a vertical portion 2 vertically provided with the slot 26c.
2a and a pair of sloping surface portions 22b which are open in the vertical direction 22a and act to spread the coating 10 of the coated electric wire 8 press-fitted into the slot 26c in the direction away from each other. Have. Further, at the central position between the pair of slope portions 22b, the conductor 9 of the electric wire 8 protruding upward from the end of the slot 26c extending downward from above and press-fitted into the slot 26c is struck. The contact protrusion 23 is provided.

Next, a method of connecting the electric wire 8 will be described. When connecting the electric wire 8, the press contact blade 22 is positioned at a predetermined position below the press contact jig 31, and the electric wire 8 is positioned below the press contact jig 31, as shown in FIG. Pressure welding jig 3
1 presses the electric wire 8 from both sides of the press contact blade 22 to press the press contact blade 2
It is configured to be inserted into the two slots 26c. The mode at this point will be described in more detail. As shown in FIGS. 3 and 4, the electric wire 8 is positioned so as to be inserted into the slot 26c, and when the pressure welding jig 31 is lowered in this state, FIGS. As shown in FIG.
It is press-fitted into the second slot 26c. Since the width of the slot 26c of the press contact blade 22 is set so as to cut the coating 10 of the electric wire 8, the slot 26c comes into close contact with the conductor 9 on both side surfaces of the electric wire 8, and the electric wire 8 and the press contact blade 22 are separated from each other. Connected so that it can be energized.

In addition to the above-mentioned connection, the press contact blade 22 in this embodiment has the following noteworthy actions. That is, the press contact blade 22 has a vertical portion 22a, and then a sloped portion 22b.
Are formed. Therefore, when the electric wire 8 is pushed into the press contact blade 22, first, the vertical portion 22a cuts into the coating 10 and comes into contact with the conductor 9, and when the electric wire 8 is pushed further, the cut portions of the coating 10 are widened in the direction in which the cut portions of the coating 10 are separated from each other due to the spread of the inclined surface portion 22b. The conductor 9 is cut at a position corresponding to the contact protrusion 23.
Is exposed. Further, as shown in FIGS. 5 and 6, when the electric wire 8 is pushed into the arc-shaped end surface which is the end of the slot 26c, the top of the contact protrusion 23 has the arc-shaped shape as described with reference to FIG. Since the conductor 9 is formed so as to project upward from the end face, the conductor 9 exposed by the inclined surface portion 22b is distributed to the left and right sides of the protrusion 23 by being struck by the collision with the contact protrusion 23. Intimate contact with the contact protrusions 23.

In comparison with the conventional pressure contact blade, the structure of the conventional pressure contact blade only contacts both sides of the electric wire with the pressure contact blade. However, in the structure of this embodiment, the conductor 9
The press contact blade 22 and the press contact blade 22 come into contact with each other at the vertical portion 22a, the inclined surface portion 22b, and the contact protrusion 23, so that the contact resistance can be significantly reduced. In addition, in the present embodiment, as shown in FIG. 6, laser is irradiated from the back surface side, which is the outside of the contact protrusion 23, as indicated by the arrow X, and the contact protrusion 23 and the conductor 9 in contact with this are welded. To do. Therefore, the conductor 9 and the press contact blade 22 are integrally connected, the contact resistance is further reduced, and contact failure due to undesired pulling or the like can be completely prevented.

As is clear from the above description, in the electric wire connection structure according to the present embodiment, it is not necessary to remove the coating 10 of the electric wire 8 in advance, and it is as simple as the conventional pressure contact terminal, and moreover than the conventional crimp terminal. Moreover, the contact resistance can be reduced.

Next, a second embodiment of the present invention will be described with reference to FIG. The difference between this embodiment and the first embodiment is that a hole or a cut is formed at the top of the contact protrusion 23 so that the conductor 9 can be soldered.
Therefore, the members having the same functions as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. That is, the contact protrusion 23
At the position corresponding to the top of the
a is formed. Therefore, as described in the first embodiment, when the electric wire 8 is pushed deeply into the press contact blade 22, the conductor 9 comes into contact with the contact protrusion 23 and a part of the conductor 9 is exposed from the cut 23a. Become.

In this embodiment, melted solder (not shown) is poured from this cut 23a as indicated by the arrow to solder the contact protrusion 23 and the conductor 9 together. Needless to say, since the contact protrusion 23, the press contact blade 22, and the entire terminal are integrated, the terminal 9 and the conductor 9 are soldered by soldering the contact protrusion 23 to the conductor 9. Therefore,
Also in this embodiment, the pressure contact blade 22 can be easily and reliably connected to the exposed conductor 9 without the coating 10 as in the case of the first embodiment, and can be connected with low resistance.

[0020]

As described above, according to the electric wire connection structure of the present invention, the electric wire is pushed into the crimping blade formed in the inverted Y shape, so that the crimping blade and the conductor are cut into the covering. In a conductive manner, and the conductor exposed by the contact protrusion is brought into close contact with the protrusion, and the contact protrusion and the conductor are melted and connected by, for example, a laser.
Alternatively, a cut or a hole is formed in the contact projection, and the conductor and the contact projection are soldered through the cut or the like. This makes it possible to omit the troublesome work such as peeling off the coating of the electric wire and crimping the pressure contact portion, which is suitable for automation, and the electric wire and the connection terminal provided with the pressure contact blade can be reliably connected with low contact resistance. Therefore, the reliability of the device using the connection terminal can be significantly improved. Further, the efficiency of the work of connecting the electric wires can be improved, and the production cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a connection structure that is a first embodiment of the present invention.

FIG. 2 is a development view showing the structure of a pressure contact blade.

FIG. 3 is a front view of the main part of the terminal showing a state before the electric wire pressure contact.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a front view of a main part of the terminal showing a state when the electric wire is pressure-welded.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is a side view of an essential part showing a connection structure showing a second embodiment of the present invention.

FIG. 8 is a perspective view showing a conventional electric wire connection structure.

FIG. 9 is a perspective view showing welding by laser.

FIG. 10 is a cross-sectional view showing a welding state.

FIG. 11 is a perspective view showing another example of conventional terminal processing.

[Explanation of symbols]

 8 wire 9 conductor 10 coating 21 wire connection structure 22 pressure contact blade 22a vertical portion 22b slope portion 23 contact protrusion 25 base 26 type 26a bending margin 26b guide portion 26c slot 31 pressure welding jig

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[Procedure amendment]

[Submission date] January 26, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

That is, in the former crimp terminal structure, as described above, it is necessary to remove the coating, which complicates automation or diversification, and especially when laser irradiation is performed. As shown by the broken line in FIG. 10, irregular reflection occurs between the plural twisted wires forming the conductor, and the irradiated portion melts and disappears, resulting in unstable electric wire connection. In the latter case, the connection between the conductor and the pressure contact terminal is made only by the thin end face of the pressure contact blade, which naturally causes high contact resistance, which is not preferable. Furthermore, when attempting to weld between the conductor and the slot surface, the exposed conductor and slot surface are so small that the work may become unstable and even the coating of the connection point may be melted. .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of an electric wire connection structure to which the present invention is applied will be described below with reference to FIGS. In the description of the embodiments, the structure of the connection structure will be described with reference to FIGS. 1 and 2, and the electric wire connection method will be described with reference to FIGS. 3 to 5. The erroneous insertion preventing action will be described with reference to FIGS. The terminal structure to which this embodiment is applied, that is, the structure of the electrical connecting portion in the crimp terminal in the conventional example is not particularly limited, and the configuration of this electrical connecting portion may be used as it is. You may apply the male terminal or female terminal called among traders. It can also be applied to a bus bar or the like that is applied when it is inserted into a connector to form a branch circuit or the like . Therefore, in the embodiments described below, the illustration and description of the electrical connection portion are omitted.

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

Claims (3)

[Claims] 1. A pair of phase directions in which a vertical portion provided with a substantially U-shaped slot and a coating of a coated electric wire which is continuously provided in the vertical portion and press-fitted into the slot are spread apart in a separating direction to expose a conductor. A pressure contact blade having an inclined surface portion open to the front, and a contact protrusion located between the inclined surface portions and protruding upward from the end of the slot to contact the exposed conductor of the covered electric wire. An electric wire connection structure characterized by being welded to a contact protrusion. 2. The method according to claim 1, wherein the contact projection has a cut or a through hole, and the conductor of the covered electric wire and the contact projection and the pressure contact blade are soldered through the cut or the through hole. The electric wire connection structure shown. 3. A pair of phase directions in which a vertical portion provided with a substantially U-shaped slot and a coating of a covered electric wire which is continuously provided in the vertical portion and press-fitted into the slot are spread apart in the separating direction to expose the conductor. A pressure contact blade having an inclined surface portion open to the front and a contact protrusion located between the inclined surface portions and protruding upward from the end of the slot to contact the exposed conductor of the covered electric wire; A method of connecting an electric wire, comprising: pressing the conductor into the slot to expose the conductor to the contact protrusion and performing welding by laser irradiation from the back surface side of the contact protrusion.