JP2022113850A - Connection structure and connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure with good electrical continuity and stable electrical performance.

SOLUTION: A connection structure 100 is configured to establish electrical continuity between a conductor 11 of a wire/cable 10 and a connector 20, in which at least an inner portion of a cylindrical conductor insertion portion 21 of the connector from which an insulating layer 13 covering the surface is removed and into which a conductor made of aluminum or aluminum alloy is inserted from an opening is made of a material having a hardness lower than that of the conductor, and at least an inner portion of the conductor insertion portion is made of aluminum or aluminum alloy, and the inner portion of the crimped conductor insertion portion is deformed according to the outer peripheral shape of each wire of the conductor on the outermost side of 19 or more wires with a total cross-sectional area of 38 mm² or more and each having an outer diameter of 2 mm or less of a conductor, and penetrates into the gap between the wires.

SELECTED DRAWING: Figure 7

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a connection structure and connection method for connecting electric wires and cables to connectors.

When connecting conductors of electric wires and cables to equipment in the board such as terminal blocks and breakers, it is common practice to connect terminals after attaching terminals to the tip of the conductor (for example, Patent Documents 1 to 3, Non-Patent Documents 1 to 4 reference). Similarly, a conductor connecting tube (see, for example, Non-Patent Document 5) is used to extend an electric wire/cable, and a branch connector is used to branch (see, for example, Patent Document 4). Terminals, conductor connecting tubes and branch connectors are hereinafter collectively referred to as connectors.

Japanese Utility Model Laid-Open No. 62-5483 Japanese Utility Model Laid-Open No. 7-22466 JP 2012-243705 A Japanese Patent No. 6087016

Fuji Terminal Industry crimp terminal <URL: https://www.fujiterminal.co.jp/products/terminal/crimp/19/> Furukawa Electric Power Systems Copper Tube Crimp Terminal Catalog <URL: http://www.feps.co.jp/products/power/pdf/support/jcaa_028.pdf> Furukawa Electric Power Systems Compression terminal <URL: http://www.feps.co.jp/products/power/pdf/support/jis_2804.pdf> Furukawa Electric Power Systems Thick copper plated aluminum compression terminal <URL: http://www.feps.co.jp/products/power/pdf/support/jis_2804.pdf> Furukawa Electric Power Systems Conductor connecting tube <URL: http://www.feps.co.jp/products/power/pdf/support/accessory_connectube.pdf>

When attaching a connector to a conductor, insert the conductor of the wire/cable into the conductor insertion hole and caulk it with a special tool. This allows the connector to be electrically and mechanically connected to the conductor.
The connection between the connector and the conductor of the electric wire/cable is required to achieve more rigorous conduction between the conductor and the connector and to obtain stable electrical performance.

Moreover, in recent years, the use of aluminum for conductors and connectors of electric wires and cables is increasing. Aluminum is a good conductor, but an insulating oxide film forms on its surface as soon as it comes into contact with oxygen.
When aluminum is used for electric wire/cable conductors and connectors, it is possible to destroy the oxide film by brushing the surface of the conductor, but it is difficult to brush the inner surface of the conductor insertion part of the terminal or conductor connection tube. .
In addition, tin-plating the surfaces of conductors and connectors made of aluminum can prevent the formation of oxide films, but it has been difficult to apply tin-plating to the inside of the conductors and connectors.
In these cases, incomplete conduction and unstable electrical performance may become particularly noticeable.

SUMMARY OF THE INVENTION An object of the present invention is to provide a connection structure and connection method in which good electrical continuity is obtained and electrical performance is stable.

The invention according to claim 1 is a connection structure for achieving electrical continuity between a conductor of an electric wire/cable and a connector,
At least an inner portion of a cylindrical conductor inserting portion of the connector into which the conductor made of aluminum or an aluminum alloy is inserted through the opening from which the insulating layer covering the surface is removed is made of a material having a hardness lower than that of the conductor. and
At least the inner portion of the conductor insertion portion is made of aluminum or an aluminum alloy,
The inner part of the crimped conductor insertion part is the outermost outermost part of 19 or more of the conductors with a total cross-sectional area of 38 mm ² or more and an outer diameter of 2 mm or less. It is characterized in that it deforms in accordance with the outer peripheral shape of the wires, penetrates into gaps between the wires, and destroys the oxide film.

Moreover, the invention according to claim 2 is the connection structure according to claim 1, wherein the conductor insertion portion is crimped by compression.

Further, the invention according to claim 3 is a connection structure for achieving electrical continuity between a conductor of an electric wire/cable and a connector,
At least an inner portion of a cylindrical conductor inserting portion of the connector into which the conductor made of aluminum or an aluminum alloy is inserted through the opening from which the insulating layer covering the surface is removed is made of a material having a hardness lower than that of the conductor. and
At least the inner portion of the conductor insertion portion is made of aluminum or an aluminum alloy,
The inner portion of the conductor insertion portion crimped by crimping is deformed according to the outer peripheral shape of each strand of the conductor at the outermost side of the plurality of strands of the conductor, and each of the strands of the conductor is deformed. It is characterized by penetrating into gaps between wires and destroying the oxide film.

Further, the invention according to claim 4 is the connection structure according to any one of claims 1 to 3, wherein the inner part of the conductor insertion part is formed on the outer peripheral surface of each of the wires. It is characterized by intruding into the gaps between the respective wires while sliding against each other.

The invention according to claim 5 is the connection structure according to any one of claims 1 to 4, wherein the connector is a terminal or a conductor connection tube.

Further, the invention according to claim 6 is a connection method for achieving electrical continuity between a conductor of an electric wire/cable and a connector,
At least an inner portion of a cylindrical conductor insertion portion of the connector into which the conductor made of aluminum or an aluminum alloy is inserted from the opening, from which the insulating layer covering the surface is removed, is made of a material having a hardness lower than that of the conductor. ,
At least the inner portion of the conductor insertion portion is made of aluminum or an aluminum alloy,
With the conductor inserted, the conductor insertion portion of the connector is crimped with a die for connection,
The inner part of the crimped conductor insertion part is the outermost outermost part of 19 or more of the conductors with a total cross-sectional area of 38 mm ² or more and an outer diameter of 2 mm or less. It is characterized in that it deforms according to the shape of the outer circumference of the wires, enters the gaps between the wires, and destroys the oxide film.

The invention according to claim 7 is the connection method according to claim 6, wherein the conductor insertion portion is crimped by compression.

Further, the invention according to claim 8 is a connection method for achieving electrical continuity between a conductor of an electric wire/cable and a connector,
At least an inner portion of a cylindrical conductor insertion portion of the connector into which the conductor made of aluminum or an aluminum alloy is inserted from the opening, from which the insulating layer covering the surface is removed, is made of a material having a hardness lower than that of the conductor. ,
At least the inner portion of the conductor insertion portion is made of aluminum or an aluminum alloy,
With the conductor inserted, the conductor insertion portion of the connector is crimped with a die for connection,
The inner portion of the conductor insertion portion crimped by crimping is deformed according to the outer peripheral shape of each strand of the conductor at the outermost side of the plurality of strands of the conductor, and each of the strands of the conductor is deformed. It is characterized by penetrating into gaps between wires and destroying the oxide film.
Further, the invention according to claim 9 is the connection method according to claim 8,
As the dies, the first die is inserted into the second die for crimping.
Further, the invention according to claim 10 is the connection method according to claim 9,
The first die is characterized in that it has a protrusion at its tip.
Further, the invention according to claim 11 is the connection method according to any one of claims 6 to 10,
The inner portion of the conductor insertion portion is inserted into the gap between the wires while sliding against the outer peripheral surface of each wire.
Further, the invention according to claim 12 is the connection method according to any one of claims 6 to 11,
The connector is characterized by being a terminal or a conductor connecting tube.

According to the present invention, since at least the inner portion of the conductor inserting portion of the connector is made of a material having a hardness lower than that of the conductor, good connection is achieved between the connector and the conductor of the electric wire/cable, good conduction can be obtained, and electrical It is possible to provide a connection structure and connection method with stable performance.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing of the connection structure of the electric wire/cable which is embodiment of invention. 1 is a cross-sectional view of a conductor of an electric wire/cable; FIG. It is a top view of a terminal. FIG. 4 is a cross-sectional view of a state in which a conductor is inserted into a conductor insertion portion; It is a cross-sectional view of a connection structure between a die used for compression and an electric wire/cable. It is an explanatory view showing first and second dies used for crimping. FIG. 7A is a cross-sectional view of a state in which a conductor is inserted and compressed and connected to the conductor insertion portion, FIG. 7B is a partially enlarged cross-sectional view when the hardness of the conductor insertion portion is large, and FIG. 7C is a conductor FIG. 4 is a partially enlarged cross-sectional view when the hardness of the insertion portion is low; 1 is a cross-sectional view of an electric wire/cable connection structure using a conductor connecting tube for a connector; FIG. FIG. 2 is a cross-sectional view of an electric wire/cable connection structure using a branch connector as a connector; FIG. 3 is a cross-sectional view of a conductor of an electric wire/cable with an increased number of strands; FIG. 10 is a list view showing an example in which conductor cross-sectional areas are made equal and the number of strands is increased.

[Overview of Embodiments of the Invention]
Embodiments of the drawings according to the present invention will be described in detail below with reference to the drawings. However, although various technically preferable limitations are attached to the embodiments described below in order to carry out the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples.
It should be noted that the technology related to wires and cables described below is a technology that can be applied to both wires and cables.

A wire/cable connection structure 100 includes a wire/cable 10 and a terminal 20 as a connector for connecting a conductor 11 of the wire/cable 10 to a terminal block or the like.
1 is a sectional view of a wire/cable connection structure 100, FIG. 2 is a sectional view of a conductor 11 of the wire/cable 10, and FIG. 3 is a plan view of a terminal 20. FIG.

[Electric wire/cable]
Copper or a copper alloy, or aluminum or an aluminum alloy is used as the material of the conductor 11 of the electric wire/cable 10 .
The conductor 11 is formed by twisting a plurality of wires 12 together. As shown in FIG. 2, the conductor 11 is a conductor in which 19 wires 12 less than φ2.0 [mm] are twisted together. The conductor 11 is covered with an insulating layer 13 as a conductor covering layer made of an insulating material (eg, crosslinked polyethylene, ethylene propylene rubber, polyvinyl chloride).
The outer periphery of the insulating layer 13 may be covered with a sheath (not shown).
Moreover, the above numerical values of each part are examples, and the dimensions can be changed arbitrarily.

[Terminal]
A terminal 20 as a connector includes a cylindrical conductor insertion portion 21 into which the conductor 11 of the electric wire/cable 10 can be inserted, and a plate-like connection portion 22 .
The terminal 20 has a plate-like portion at one end of a cylindrical body made of copper, a copper alloy, aluminum, or an aluminum alloy. FIG. 1 exemplifies the case where the terminal 20 is formed into a plate-like portion by crushing one end of a pipe. Alternatively, the terminal 20 may be formed by fixing the cylindrical conductor inserting portion 21 and the plate-like connecting portion 22 which are separate bodies.
The connection portion 22 is formed with a through hole 221 for connection to a terminal block or the like, and can be fixed with a screw.
The conductor insertion portion 21 is closed at the end on the side of the connection portion 22 and is open at the opposite end so that the conductor 11 can be inserted therein.

The terminal 20 is made of copper or a copper alloy, or aluminum or an aluminum alloy like the conductor 11 of the wire/cable 10, but the material having a lower hardness than the conductor 11 of the wire/cable 10 is used. .
In particular, the terminal 20 is made of copper or a copper alloy with a Vickers hardness of 80 or less, more preferably 65 or less (however, the lower limit is 40), or aluminum or an aluminum alloy with a Vickers hardness of 50 or less, more preferably 35 or less (however, with a lower limit of 15).

[Connection of terminal and conductor]
The connection of the conductor 11 of the electric wire/cable 10 to the conductor insertion portion 21 of the terminal 20 will be described.
The connection of the conductor 11 to the conductor insertion portion 21 is performed by crimping the conductor insertion portion 21 from the outside while the conductor 11 is inserted into the conductor insertion portion 21 .
There are two types of crimping: a compression method and a crimping method.

The compression is performed once or more depending on the diameter of the conductor 11 inserted into the conductor inserting portion 21 shown in FIG. to mechanically and electrically connect the conductor inserting portion 21 and the conductor 11 by compressing and deforming them so that the cross-sectional shape becomes a polygon (for example, a hexagon).

For crimping, as shown in FIG. 6, connection is made using a tool that inserts the first die 201 into the second die 203 .
The second die 203 has a recess 204 that accommodates the conductor insertion portion 21 with the conductor 11 inserted therein. A first die 201 has a convex portion 202 at its tip and can be pushed into a concave portion 204 . The pressing pressure of the first die 201 can be obtained from human power, a motor, hydraulic pressure, or the like, and crimping is performed by a single pressing operation.

7A is a cross-sectional view showing a state in which the conductor 11 is connected to the conductor insertion portion 21 by hexagonal compression, and FIG. 7B is a region where the conductor insertion portion 21 has a higher hardness than the conductor 11. FIG. 7(C) is an enlarged cross-sectional view of the region P when the hardness of the conductor insertion portion 21 is lower than that of the conductor 11. FIG.
When the hardness of the conductor insertion portion is higher than that of the conductor, the inner peripheral surface of the conductor insertion portion 21 does not sufficiently enter the gap between the wires 12 as shown in FIG. 7(B). On the other hand, when the hardness of the conductor insertion portion 21 is lower than that of the conductor 11, the inner peripheral surface of the conductor insertion portion 21 of the terminal 20, which is the inner portion of the conductor insertion portion 21, is deformed when a strong external pressure is applied by caulking. Deformation occurs according to the outer peripheral shape of the wire 12, and the deformed portion of the inner peripheral surface of the conductor insertion portion 21 slides on the outer peripheral surface of each wire 12 as indicated by the arrow in FIG. 7(C). while intruding into the gaps between the wires 12 .
By inserting the inner peripheral surface of the conductor insertion portion 21 into the gap between the strands 12, the number of contacts with the surface of the strands increases, and good electrical conduction can be achieved.

Aluminum or an aluminum alloy immediately forms an insulating oxide film when its surface comes into contact with oxygen. However, since this oxide film is fragile, it can be destroyed relatively easily by deformation of the material or sliding between materials.
Therefore, even when aluminum or an aluminum alloy is used for the terminal 20 and the conductor 11, the inner portion of the conductor insertion portion 21 deforms and slides into the gaps between the wires 12, It is possible to effectively destroy the mutual oxide film and achieve good electrical conduction.
In addition, since the inner portion of the conductor inserting portion 21 is deformed and penetrates into the gaps between the strands 12, a wider contact area can be ensured, and from this aspect as well, good electrical conduction can be achieved. It is possible to plan

In addition, in order to achieve good electrical conduction with aluminum or aluminum alloy, conductive metal fine particles (for example, zinc fine particles) and viscous grease (mineral oil grease, silicone grease and other greases in general or mineral oil ) can be applied to the surface to prevent destruction and regeneration of the oxide film and to prevent moisture from entering.
In the connection structure 100 composed of the terminal 20 and the wire/cable 10 , good conduction between the conductor insertion portion 21 and the conductor 11 can be achieved by the effect of the deformation of the inner portion of the conductor insertion portion 21 .
However, the above conductive compound is used in order to realize a better conduction state between the conductor insertion portion 21 and the conductor 11 and to maintain a better conduction state between the conductor insertion portion 21 and the conductor 11 for a longer period of time. You can
In that case, it is possible to enclose or apply a conductive compound inside the conductor insertion portion 21 of the terminal 20 before inserting the conductor 11 of the electric wire/cable 10, or to apply a conductive compound to the conductor 11. desirable.

In the wire/cable connection structure 100, the entire terminal 20 is made of aluminum or an aluminum alloy having a Vickers hardness of 50 or less (more preferably 35 or less), or of a Vickers hardness of 80 or less (more preferably 65 or less). Although the case where it is formed from copper or a copper alloy has been exemplified, only the conductor insertion portion 21 of the terminal 20 or only the inner portion of the conductor insertion portion 21 is made of aluminum or aluminum alloy having the above hardness or copper or copper alloy having the above hardness. It may be partially formed from
When only the inner portion of the conductor insertion portion 21 is made of aluminum or aluminum alloy having the above hardness or copper or copper alloy having the above hardness, as shown by the two-dot chain line in FIG. , for example, the thickness of the wire/cable 10, which is about the radius of the strand 12 of the conductor 11, or more.

Further, in the connection structure 100, if at least the inner portion of the conductor insertion portion 21 of the terminal 20 has a lower hardness than the conductor 11 of the electric wire/cable 10, the conductor insertion portion 21 and the conductor 11 may be made of a metal other than aluminum or an aluminum alloy. You may form with material.
For example, the conductor 11 of the electric wire/cable 10 may be made of copper or a copper alloy.
Further, the terminal 20 as a whole, only the conductor inserting portion 21, or only the inner portion of the conductor inserting portion 21 may be made of a metal material other than aluminum or an aluminum alloy.
If a portion of the terminal 20 is made of aluminum or an aluminum alloy and the other portion is made of a metal material other than aluminum or an aluminum alloy, the respective parts can be joined by a method that is unlikely to cause the problem of dissimilar metal corrosion. desirable.
Further, when at least one of the inner portion of the conductor insertion portion 21 and the conductor 11 is made of aluminum or an aluminum alloy, the conductor insertion portion 21 may be Preferably, the inside of 21 or conductor 11 is encapsulated or coated with the aforementioned compound.

[Other examples of connectors (1)]
In the electric wire/cable connection structure 100, the terminal 20 is used as a connector, but the present invention can also be applied to an electric wire/cable connection structure using a connector as a conductor connecting tube. FIG. 8 is a cross-sectional view of a wire/cable connection structure using a connector as a conductor connection tube 30 .
The conductor connection tube 30 is a connector that connects the conductors 11 of the two wires/cables 10 to each other.
As shown in the figure, the conductor connection tube 30 is a cylindrical body with both ends open, and conductor inserting portions 31 at both ends. Note that the central portion may be closed.

This conductor connecting tube 30 also has a Vickers hardness of 80 or less, more preferably 65 or less (the lower limit is 40), which is lower than the hardness of the conductor 11 in the whole, or only the conductor insertion portion 31, or only the inner portion of the conductor insertion portion 31. It is made of copper or a copper alloy, or aluminum or an aluminum alloy having a Vickers hardness of 50 or less, more preferably 35 or less (the lower limit is 15).
The conductor 11 of each electric wire/cable 10 is inserted into each conductor inserting portion 31 of the conductor connecting tube 30, and the conductor connecting tube 30 and the conductor 11 are connected by caulking.

In the case of the electric wire/cable connection structure of FIG. 8 as well, regarding the change of the metal material in the conductor 11, the entire conductor connection tube 30, the conductor insertion portion 31, or the inner portion of the conductor insertion portion 31, the above electric wire/cable connection structure Same as 100.
In addition, the use of a conductive compound is the same as in the wire/cable connection structure 100 described above.

[Other examples of connectors (2)]
In the electric wire/cable connection structure 100, the terminal 20 is used as a connector, but the present invention can also be applied to an electric wire/cable connection structure in which the connector is a branch connector. FIG. 9 is a cross-sectional view of an electric wire/cable connection structure using a branch connector 40 as a connector.
The branch connector 40 is a connector that connects one end of the second wire/cable 60 in the middle of the first wire/cable 50 .

The first electric wire/cable 50 includes a conductor 51 and an insulating layer 53 covering the conductor 51, and the structures and forming materials thereof are the same as those of the electric wire/cable 10 described above.
The second electric wire/cable 60 includes a conductor 61 and an insulating layer 63 covering the conductor 61, and these structures and forming materials are the same as those of the electric wire/cable 10 described above.

The first electric wire/cable 50 has the insulating layer 53 partially removed in the middle to expose the conductor 51, and the second electric wire/cable 60 has the insulating layer 63 removed at the connection end. Conductor 61 is exposed.
The branch connector 40 is formed with conductor insertion portions 41 and 42 consisting of two U-shaped or C-shaped grooves in cross section, and one of the conductor insertion portions 41 accommodates the exposed conductor 51 of the first wire/cable 50 . is inserted, and the exposed conductor 61 of the second wire/cable 60 is inserted into the other conductor insertion portion 42 .

This branch connector 40 as a whole or only the inner portions of the conductor insertion portions 41 and 42 is made of copper or copper having a Vickers hardness of 80 or less, more preferably 65 or less (the lower limit is 40), which is lower than the hardness of the conductors 51 and 61. It is formed from an alloy, or aluminum or an aluminum alloy having a Vickers hardness of 50 or less, more preferably 35 or less (the lower limit is 15).
Then, the conductor insertion portions 41 and 42 of the branch connector 40 are crimped so that the grooves contract inward, and the branch connector 40 and the first electric wire/conductor 51 of the cable 50 and the second electric wire/ The connection of the conductors 61 of the cable 60 is made.

In the case of the electric wire/cable connection structure of FIG. 9 as well, the metal materials of the conductors 51 and 61, the entire branch connector 40, and the inner portions of the conductor insertion portions 41 and 42 are the same as those of the electric wire/cable connection structure 100 described above. are the same.
In addition, the use of a conductive compound is the same as in the wire/cable connection structure 100 described above.

[Regarding the outer diameter and number of strands of wires and cables]
When the conductor 11 of the electric wire/cable 10 is configured by twisting the strands 12 of the same outer diameter, six strands are arranged around one strand 12 because of the good fit of the circular cross-sectional shape. 12 (when the conductor 11 is composed of seven wires 12 in total), and when twelve wires 12 are arranged outside the seven wires 12 (total 19 strands 12 constitute the conductor 11), and 18 strands 12 are arranged outside the 19 strands 12 (a total of 37 strands If the conductor 11 is composed of the strands 12, see FIG. When the conductor 11 is composed of a single wire 12).
On the other hand, the conductivity or electrical resistance of the conductor 11 is determined by the total cross-sectional area of each wire 12, so the total cross-sectional area is gradually increased to 38 [mm ² ], 60 [mm ² ], 100 [mm ² ]. ] and 150 [mm ² ].

In FIG. 11, for each value of the stepwise total cross-sectional area, the number of strands and the outer diameter (expressed as number/outer diameter) of the conventionally determined number of strands are described in the "Normal" column, More appropriate examples of the number of strands and their outer diameters are described in the column "Examples of Strand Configuration".
As described here, in the case of a total cross-sectional area of 38 [mm ² ], seven wires 12 with an outer diameter of 2.6 [mm] were conventionally used to constitute the conductor 11, but the conductor 11 has an outer diameter of 1.65 [mm]. It is desirable to configure the conductor 11 with 19 strands of wire 12 of [mm] increased by one step.
Further, in the case of a total cross-sectional area of 60 [mm ² ], the conductor 11 was conventionally constructed using 19 wires 12 with an outer diameter of 2.0 [mm], but the conductor 11 with an outer diameter of 1.45 [mm] It is desirable to increase the number of strands 12 by one level to form the conductor 11 with 37 strands.
Further, in the case of a total cross-sectional area of 100 [mm ² ], the conductor 11 was conventionally configured using 19 wires 12 with an outer diameter of 2.6 [mm], but the conductor 11 with an outer diameter of 1.85 [mm] It is desirable to increase the number of strands 12 by one level to form the conductor 11 with 37 strands.
Also, in the case of a total cross-sectional area of 150 [mm ² ], the conductor 11 was previously constructed using 37 wires 12 with an outer diameter of 2.3 [mm], but the outer diameter is 1.92 [mm]. It is desirable to increase the number of strands 12 by one stage to form the conductor 11 with 61 strands.
For each cross-sectional area, the case where the number of wires 12 is increased by one step from the conventional example is illustrated, but wires 12 with a smaller outer diameter may be used by increasing the number by one step.
In any case, it is desirable that the outer diameter of the wire 12 is less than 2 [mm].
The relationship between the number of wire strands and the outer diameter illustrated in FIG.

[Technical effect of the embodiment of the invention]
In the wire/cable connection structure 100 , at least the inner portion of the conductor insertion portion 21 of the terminal 20 is made of a material having a lower hardness than the conductor 11 of the wire/cable 10 .
Further, these are connected by crimping with dies 201, 203 or 301, 302 in a state where the conductor 11 is inserted into the conductor insertion portion 21. FIG.
Therefore, in connection between the terminal 20 and the conductor 11, the inner portion of the conductor inserting portion 21 is deformed while sliding according to the outer peripheral shape of the conductor 11, and the contact between them is increased in a wider range, thereby increasing the number of contacts. can. Therefore, it is possible to improve the conduction between the conductor 11 and the terminal 20 and obtain stable electrical performance.
In particular, at least the inner portion of the conductor insertion portion 21 is made to have a Vickers hardness of 80 or less in the case of copper or a copper alloy, and a Vickers hardness of 50 or less in the case of aluminum or an aluminum alloy, thereby preventing deformation of the inner portion of the conductor insertion portion 21. This can be done more smoothly, the conduction between the conductor 11 and the terminal 20 can be further improved, and more stable electrical performance can be obtained.

In addition, when at least the inner portion of the conductor insertion portion 21 is made of aluminum or aluminum alloy, aluminum or aluminum alloy is a good conductor and lightweight, and is soft, so that it can easily obtain an appropriate Vickers hardness. Therefore, it is possible to obtain the electric wire/cable connection structure 100 having good conduction and stable electric performance.
Further, in connection between the terminal 20 and the conductor 11, the inner portion of the conductor insertion portion 21 is deformed while sliding according to the outer peripheral shape of the conductor 11, so if an oxide film is formed on the inner portion of the conductor insertion portion 21 However, the sliding and deformation effectively destroy the oxide film, and it is possible to achieve good conduction with the conductor 11 and obtain stable electrical performance.

In addition, by forming the conductor 11 by twisting the wires 12 having an outer diameter of less than 2 [mm], the number of twisted wires can be increased, and the contact area with the inner part of the conductor insertion portion 21 can be expanded. becomes possible. Furthermore, since each element wire 12 can effectively deform the inner portion of the conductor insertion portion 21 and can be brought into proper contact, the conduction between the conductor 11 and the terminal 20 can be further improved, and more stable electrical performance can be obtained. becomes possible.
When at least the inner portion of the conductor insertion portion 21 is made of aluminum or an aluminum alloy, even if an oxide film is formed on the inner surface of the conductor insertion portion 21 or the surface of the conductor 11, the conductor 11 and the inner portion of the conductor insertion portion 21 Mutual oxide films are effectively destroyed by sliding against each other, and good conduction is achieved, making it possible to obtain stable electrical performance. In particular, it is possible to easily destroy the inner surface of the conductor inserting portion 21, which is difficult to remove the oxide film.
In addition, when the conductor 11 made up of a larger number of strands 12 is used by using strands 12 having a smaller outer diameter, the number of irregularities on the outer circumference of the conductor 11 increases, so that the conductor inserting portion can be more effectively used. It becomes possible to destroy the oxide film on the inner surface of 21 .

The technical effects described above can be similarly obtained when the connector is the conductor connection tube 30 or the branch connector 40, or when the wires/cables 50 and 60 are used instead of the wires/cables 10. be.

It goes without saying that in each of the above-described embodiments, specific detailed structures and the like can be changed as appropriate.

10 Electric wire/cable 11 Conductor 12 Wire 13 Insulating layer 20 Terminal (connector)
21 conductor insertion portion 22 connection portion 30 conductor connection tube (connector)
31 conductor insertion portion 40 branch connector (connector)
41, 42 conductor insertion portion 50 first electric wire/cable 51 conductor 53 insulating layer 60 second electric wire/cable 61 conductor 63 insulating layer 100 connection structure

Claims (12)

A connection structure for achieving electrical continuity between a conductor of an electric wire/cable and a connector,
At least an inner portion of a cylindrical conductor inserting portion of the connector into which the conductor made of aluminum or an aluminum alloy is inserted through the opening from which the insulating layer covering the surface is removed is made of a material having a hardness lower than that of the conductor. and
At least the inner portion of the conductor insertion portion is made of aluminum or an aluminum alloy,
The inner part of the crimped conductor insertion part is the outermost outermost part of 19 or more of the conductors with a total cross-sectional area of 38 mm ² or more and an outer diameter of 2 mm or less. A connecting structure characterized in that deformation occurs in accordance with the outer peripheral shape of the strands of wire and penetrates into gaps between the strands of wire to destroy the oxide film. 2. The connection structure according to claim 1, wherein said conductor insertion portion is crimped by compression. A connection structure for achieving electrical continuity between a conductor of an electric wire/cable and a connector,
At least an inner portion of a cylindrical conductor inserting portion of the connector into which the conductor made of aluminum or an aluminum alloy is inserted through the opening from which the insulating layer covering the surface is removed is made of a material having a hardness lower than that of the conductor. and
At least the inner portion of the conductor insertion portion is made of aluminum or an aluminum alloy,
The inner portion of the conductor insertion portion crimped by crimping is deformed according to the outer peripheral shape of each strand of the conductor at the outermost side of the plurality of strands of the conductor, and each of the strands of the conductor is deformed. A connection structure characterized by penetrating into gaps between wires and destroying an oxide film. 4. The inner portion of the conductor inserting portion enters into the gap between the wires while sliding against the outer peripheral surface of each wire. or the connection structure according to item 1. The connection structure according to any one of claims 1 to 4, wherein the connector is a terminal or a conductor connection tube. A connection method for establishing electrical continuity between a conductor of an electric wire/cable and a connector,
At least an inner portion of a cylindrical conductor insertion portion of the connector into which the conductor made of aluminum or an aluminum alloy is inserted from the opening, from which the insulating layer covering the surface is removed, is made of a material having a hardness lower than that of the conductor. ,
At least the inner portion of the conductor insertion portion is made of aluminum or an aluminum alloy,
With the conductor inserted, the conductor insertion portion of the connector is crimped with a die for connection,
The inner part of the crimped conductor insertion part is the outermost outermost side of 19 or more of the conductors with a total cross-sectional area of 38 mm ² or more and an outer diameter of 2 mm or less. A connection method characterized in that deformation is generated according to the outer peripheral shape of the wires, and the oxide film is destroyed by entering the gaps between the wires. 7. The connection method according to claim 6, wherein said conductor insertion portion is crimped by compression. A connection method for establishing electrical continuity between a conductor of an electric wire/cable and a connector,
At least an inner portion of a cylindrical conductor insertion portion of the connector into which the conductor made of aluminum or an aluminum alloy is inserted from the opening, from which the insulating layer covering the surface is removed, is made of a material having a hardness lower than that of the conductor. ,
At least the inner portion of the conductor insertion portion is made of aluminum or an aluminum alloy,
With the conductor inserted, the conductor insertion portion of the connector is crimped with a die for connection,
The inner portion of the conductor insertion portion crimped by crimping is deformed according to the outer peripheral shape of each strand of the conductor at the outermost side of the plurality of strands of the conductor, and each of the strands of the conductor is deformed. A connection method characterized by penetrating into gaps between wires to destroy the oxide film. 9. The connection method according to claim 8, wherein a first die is inserted into a second die as said die for crimping. 10. The connection method according to claim 9, wherein said first die has a projection at its tip. 11. The inner portion of the conductor inserting portion is inserted into the gap between the wires while sliding against the outer peripheral surface of each wire. The connection method described in the section. 12. The connection method according to any one of claims 6 to 11, wherein the connector is a terminal or a conductor connection tube.

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