JP2013122870A - Terminal-equipped electric wire and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal-equipped electric wire having improved connection reliability between a terminal and an electric wire, and also to provide a manufacturing method of the terminal-equipped electric wire.SOLUTION: A terminal-equipped electric wire 10 comprises: an electric wire 11 having a conductor 12 made of aluminum or an aluminum alloy, and an insulation coating 13 covering the conductor 12; and a terminal 20 electrically connected to an exposed conductor 12 which is exposed at a terminal 11A of the electric wire 11. The terminal 20 has a cylindrical portion 22 through which the electric wire 11 is inserted. The cylindrical portion 22 includes: a crimped portion 24 which is formed by crimping the cylindrical portion 22 with the electric wire 11 inserted therethrough; and an electric wire connection 23 which is formed by crimping, while heating, a conductor arrangement region 22A, located closer to the terminal 11A of the electric wire 11 than the crimped portion 24, where the exposed conductor 12 of the cylindrical portion 22 is arranged, and which electrically connects the electric wire 11 and the terminal 20 to each other.

Description

  The present invention relates to an electric wire with a terminal and a method for manufacturing the same.

  As an electric wire with a terminal provided with a conductor consisting of a stranded wire obtained by twisting a plurality of metal strands with an insulating coating, and an electric wire where the conductor is exposed at the terminal and a terminal connected to the terminal of the electric wire For example, the thing of patent document 1 etc. are known.

  In the electric wire with a terminal described in Patent Document 1, a wire barrel of a terminal is crimped to an exposed conductor exposed at the end of the electric wire so as to be electrically connected.

Japanese Utility Model Publication No. 5-72053

  In the electric wire with terminal of the type described in Patent Document 1, the terminal and the electric wire are electrically connected by contacting the exposed conductor and the inner surface (terminal) of the wire barrel. Therefore, it is conceivable to increase the contact portion between the conductor and the wire barrel by lowering the connection resistance by crimping the wire barrel to the conductor with high pressure bonding.

  However, when a wire barrel is connected to a conductor with high pressure bonding, stress is applied to the connection portion between the conductor and the wire barrel due to wire stress such as vibration of the wire or bending of the wire, and the electrical connection state of the connection portion is reduced. May get worse.

  This invention is completed based on the above situations, Comprising: It aims at providing the electric wire with a terminal which improved the connection reliability of a terminal and an electric wire, and its manufacturing method.

  In order to solve the above problems, the present invention provides an electric wire having a conductor made of aluminum or aluminum alloy and an insulating coating covering the conductor, and a terminal electrically connected to an exposed conductor exposed at an end of the electric wire. An electric wire with a terminal provided, wherein the terminal has a cylindrical portion through which the electric wire can be inserted, and the cylindrical portion in a state where the electric wire is inserted is crimped to the cylindrical portion. The formed crimping part and the region where the exposed conductor of the cylindrical part is arranged, and formed by crimping while heating the conductor arrangement region closer to the end of the electric wire than the crimping part, It is an electric wire with a terminal provided with the electric wire connection part which connects the said electric wire and the said terminal electrically.

  In addition, the present invention provides an electric wire with a terminal provided with an electric wire having an aluminum or aluminum alloy conductor and an insulating coating covering the electric conductor, and a terminal electrically connected to an exposed conductor exposed at an end of the electric wire. The crimping part is formed by crimping the cylindrical part after the electric wire is inserted into the cylindrical part through which the electric wire provided in the terminal can be inserted, and the cylinder A method of manufacturing a terminal-attached electric wire that forms an electric wire connecting portion by heating and crimping a conductor arrangement region closer to the end of the electric wire than the crimping portion, in the region where the exposed conductor is arranged It is.

  In the present invention, the terminal has a crimped part formed by crimping the cylindrical part, and a wire connecting part formed by crimping while heating a region closer to the end of the electric wire than the crimped part of the cylindrical part, As a result, the electric wires are fixed and connected. Here, the wire connecting portion is formed by crimping while heating, with the exposed conductor inserted through the cylindrical portion provided in the terminal, so that it is in a highly crimped state rather than crimping without heating. be able to. Therefore, according to the present invention, in the wire connection portion, the contact area between the terminal and the exposed conductor is increased, and the destruction of the oxide film of the exposed conductor is promoted, so that the electrical connection between the terminal and the wire is good. Can be.

  Further, in the present invention, the stress generated by the wire stress such as the vibration of the wire or the bending of the wire is applied to the crimping portion, so that it is difficult to be transmitted to the wire connecting portion formed in the region near the end of the wire. Deterioration of the electrical connection state between the electric wire and the terminal is prevented. Furthermore, in the present invention, since the crimping part can be formed simply by crimping the cylindrical part, the cost is lower than covering the terminal with a covering member which is a separate member. As mentioned above, according to this invention, the electric wire with a terminal which improved the connection reliability of a terminal and an electric wire, and its manufacturing method can be provided.

The present invention preferably has the following configuration.
The crimping part is formed by crimping a covering part arrangement region of the cylindrical part in which the covering part covered with the insulating coating of the electric wire is arranged. With such a configuration, since the boundary portion between the covering portion of the electric wire and the exposed conductor is covered with the cylindrical portion, it is possible to prevent the boundary portion from being bent and the like and to prevent intrusion of water or the like from the boundary portion. Therefore, it is preferable.

In the electric wire with terminal of the present invention, the electric wire connecting portion is provided so as to form a shape along a cross-sectional shape of the exposed conductor.
Or in the manufacturing method of the electric wire with a terminal of the present invention, the electric wire connecting part is formed by crimping the cylindrical part while energizing and heating the crimping die having a shape along the cross-sectional shape of the exposed conductor.

  The above configuration is preferable because the cylindrical body of the terminal is deformed into a shape along the cross-sectional shape of the exposed conductor and thermocompression-bonded, so that a large force does not act on the crimping die. In addition, it is particularly preferable that the wire connection portion is formed by a method in which pressure bonding is performed while energizing and heating because the wire connection portion can be formed by a method having excellent thermal efficiency.

  ADVANTAGE OF THE INVENTION According to this invention, the electric wire with a terminal which improved the connection reliability of a terminal and an electric wire, and its manufacturing method can be provided.

The perspective view of the electric wire with a terminal of Embodiment 1 Plan view of electric wire with terminal Sectional drawing in the AA line of FIG. Terminal perspective view The perspective view which shows a mode that the electric wire was inserted in the cylindrical part of the terminal The perspective view which shows the procedure which arrange | positions the terminal which let the electric wire of FIG. 5 penetrated to a crimping | compression-bonding metal mold | die. Side view in the state of FIG. The perspective view which shows a mode that the terminal which let the electric wire of FIG. Side view in the state of FIG. The perspective view which shows the procedure which arrange | positions the electric wire with a terminal in which the crimp part was formed in a crimping die The perspective view which shows a mode that the electric wire with a terminal in which the crimp part was formed was pinched with the crimping die. The perspective view of the electric wire with a terminal of Embodiment 2 Plan view of electric wire with terminal Sectional drawing in the BB line of FIG.

<Embodiment 1>
The electric wire 10 with a terminal of Embodiment 1 is demonstrated with reference to FIG. The electric wire 10 with a terminal of Embodiment 1 consists of the electric wire 11 and the terminal 20 connected to the terminal 11A of the electric wire 11, as shown in FIG. In the following description, the upper and lower directions will be described with reference to FIG. 3, and the front and rear directions will be described with the left side of FIG. 2 as the front and the right side as the rear.

  As shown in FIG. 1, the conductor 11 is covered with a synthetic resin insulating coating 13 around the conductor 12. As shown in FIG. 3, at the terminal 11 </ b> A of the electric wire 11, the insulating coating 13 is stripped and the conductor 12 is exposed (an example of “exposed conductor 12”).

  The conductor 12 is a stranded wire in which many (plural) metal strands are twisted together. The conductor 12 (metal strand) is made of aluminum or aluminum alloy.

  The cross-sectional shape of the electric wire 11 and the cross-sectional shape of the conductor 12 are each substantially circular, and in the terminal 11A connected to the terminal 20, a part of the exposed conductor 12 is deformed into a circular shape having a smaller diameter than other parts. doing.

  The terminal 20 includes a flat-plate-shaped terminal connection portion 21 connected to a counterpart terminal (not shown), and a cylindrical portion 22 connected to the rear of the terminal connection portion 21. A terminal connection hole 21 </ b> A for connecting a counterpart terminal is provided at a substantially central portion of the terminal connection portion 21.

  The cylindrical portion 22 has a cylindrical shape in which the terminal 11A of the electric wire 11 can be inserted. In the present embodiment, the cylindrical portion 22 is formed by deforming a portion continuous from the flat terminal connecting portion 21 to the rear side into a cylindrical shape.

  In the cylindrical portion 22, as shown in FIG. 3, there is a portion from the exposed conductor 12 where the conductor 12 is exposed at the terminal 11 </ b> A of the electric wire 11 to the covering portion 14 which is continuous from the exposed conductor 12 and is covered with the insulating coating 13. Has been placed. That is, in the present embodiment, the front end portion of the covering portion 14 of the electric wire 11 (the boundary portion 15 between the covering portion 14 of the electric wire 11 and the exposed conductor 12) is also disposed in the cylindrical portion 22.

  Now, as shown in FIGS. 2 and 3, the cylindrical portion 22 is provided with two portions 23 and 24 that are compressed more than the other portions. The compression-shaped portion 23 located on the front side of the cylindrical portion 22 is an electric wire connection portion 23 formed by pressure-bonding (heating and pressing) the exposed conductor 12 while heating the cylindrical portion 22. The compression-shaped portion 24 located on the rear side of the tubular portion 22 is a crimp portion 24 formed by crimping the tubular portion 22 to the electric wire 11 in a non-heated state. The wire connecting portion 23 is crimped to the wire 11 with a higher crimping force than the crimping portion 24.

  Specifically, the wire connecting portion 23 of the tubular portion 22 is a region where the exposed conductor 12 is disposed, and is formed by thermocompression bonding of a conductor placement region 22A closer to the terminal 11A of the wire 11 than the crimping portion 24. ing. In the wire connection portion 23, the inner wall surface of the terminal 20 and the exposed conductor 12 are in contact with each other over the entire area, and the cross-sectional area of the conductor 12 is cut in a direction perpendicular to the longitudinal direction of the conductor 12 before crimping. The cross-sectional area is smaller than the cross-sectional area) (for example, about 30 to 70% of the cross-sectional area before pressure bonding).

  The crimping portion 24 of the cylindrical portion 22 is formed by crimping a region 22B (covering portion arrangement region 22B) where the covering portion 14 of the electric wire 11 covered with the insulating coating 13 is disposed behind the exposed conductor 12. ing. In the crimping portion 24, the inner wall surface of the terminal 20 and the outer surface of the covering portion 14 of the electric wire 11 are in contact with each other over the entire area. The cross-sectional area of the electric wire 11 in the crimping part 24 (the area of the cross section cut in the direction orthogonal to the longitudinal direction) is substantially the same before and after crimping, or slightly smaller after crimping than before crimping.

  Examples of the metal material constituting the terminal 20 include copper, a copper alloy, aluminum, an aluminum alloy, and the like, and an appropriate metal material is selected as necessary. In addition, the plating layer is formed in the surface of the metal plate material which comprises the terminal 20 of this embodiment. Examples of the metal constituting the plating layer include tin, nickel, and the like, and are appropriately selected from arbitrary metal materials as necessary.

Next, although an example of the manufacturing method of the electric wire 10 with a terminal of this embodiment is demonstrated, this invention is not limited to this.
A terminal 20 having the shape shown in FIG. 4 is prepared, and the insulating coating 13 of the terminal 11A of the electric wire 11 is peeled and removed to expose the conductor 12. Next, as shown in FIG. 5, a region from the exposed conductor 12 exposed at the front end (terminal 11 </ b> A) of the electric wire 11 to the front end portion of the covering portion 14 covered with the insulating coating 13 is a cylindrical portion 22 of the terminal 20. Insert into.

  The cylindrical portion 22 of the terminal 20 into which the terminal 11A of the electric wire 11 is inserted is crimped to the electric wire 11 by using the crimping die 30 shown in FIGS. When the crimping portion 24 is formed, the cylindrical portion 22 of the terminal 20 is sandwiched between the crimping die 32 disposed on the lower side and the crimping die 31 disposed on the upper side (FIG. 8). And see FIG. 9). Although the cylindrical part 22 after crimping | transformation is deform | transformed into the shape along the outer surface of the coating | coated part 14 of the electric wire 11, as shown in FIG.7 and FIG.9, the cross-sectional area of the electric wire 11 is substantially the same. Here, in FIG. 7 and FIG. 9, a cross section of the electric wire 11 viewed from the rear end side is shown.

  Next, the conductor connecting region 22A in which the conductor 12 is disposed is formed in the region in front of the crimping portion 24 of the cylindrical portion 22 (the region near the terminal 11A of the electric wire 11), and the wire connecting portion 23 is formed. To do. At the time of thermocompression bonding, a pressure-bonding die 40 different from the case where the pressure-bonding portion 24 is formed, which includes an electrode (electrically-conductive portion 43) capable of being heated by energization is used. When thermocompression bonding is performed, the cylindrical portion 22 of the terminal 20 is sandwiched between a crimping mold 42 disposed on the lower side and a crimping mold 41 disposed on the upper side (see FIG. 10 and FIG. 10). (See FIG. 11). After the state shown in FIG. 11, current is passed through the energizing portion 43 of the crimping die 40 to crimp the cylindrical portion 22 to the exposed conductor 12 while energizing and heating. As the crimping die 40, one that can deform the cylindrical portion 22 into a shape along the sectional shape of the exposed conductor 12 (that is, the sectional shape is substantially circular) is used.

  By crimping the conductor arrangement region 22A of the cylindrical portion 22 while energizing and heating, a part of the cylindrical portion 22 of the terminal 20 is crimped to form the wire connecting portion 23 having a circular cross section, and the terminal shown in FIG. The attached electric wire 10 is obtained.

  Here, if the heating temperature at the time of energization heating of the cylindrical portion 22 is too high, there are concerns about problems such as damage to the insulating coating 13 of the electric wire 11, deformation of the terminal 20, and melting and thinning of the conductor 12. . Therefore, in the present embodiment, the temperature during energization heating (temperature measured using a radiation thermometer) is set to 300 ° C. or more and 500 ° C. or less. If the heating temperature is set in such a range, the cylindrical portion 22 can be heated and softened at a temperature lower than the melting point of aluminum which is the material of the conductor 12, so that the conductor 12 is not thinned, and the electric wire 11 The oxide film of the conductor 12 is easily broken. The heating temperature is particularly preferably 400 ° C. or lower. The pressure-bonding force when the cylindrical portion 22 is heat-bonded is preferably, for example, 980 N (100 kgf) to 1960 N (200 kgf).

Next, the effect of this embodiment is demonstrated.
In the present embodiment, the terminal 20 is heated by a crimping part 24 formed by crimping the cylindrical part 22 and a conductor arrangement region 22A closer to the terminal 11A of the electric wire 11 than the crimping part 24 of the cylindrical part 22. The electric wire 11 is fixed and connected by the electric wire connecting portion 23 formed by pressure bonding. In this embodiment, since the electric wire connection part 23 is formed by being crimped in a state where the cylindrical portion 22 of the terminal 20 is softened by heating, it is in a highly crimped state rather than crimping without heating (crimping) The ratio of the cross-sectional area after crimping to the previous cross-sectional area can be reduced). As a result, according to the present embodiment, the contact area between the terminal 20 and the exposed conductor 12 can be increased in the wire connecting portion 23 and the destruction of the oxide film of the exposed conductor 12 can be promoted. Can be made good.

  Moreover, in this embodiment, the stress which generate | occur | produces by electric wire stress, such as a vibration of the electric wire 11, and the bending of the electric wire 11, is applied to the crimping | compression-bonding part 24, and the electric wire connection part 23 formed in the area | region near the terminal 11A of the electric wire 11 is applied. Since it becomes difficult to transmit, the electrical connection state between the electric wire 11 and the terminal 20 is prevented from deteriorating. Furthermore, in this embodiment, since the crimping | compression-bonding part 24 can be formed only by crimping | bonding the cylindrical part 22, it is cheaper than attaching a crimping | compression-bonding member (not shown) to the terminal 20 separately. As mentioned above, according to this embodiment, the electric wire 10 with a terminal which improved the connection reliability of the terminal 20 and the electric wire 11, and its manufacturing method can be provided.

  Moreover, according to this embodiment, since the crimping part 24 is formed by crimping the coating part arrangement | positioning area | region 22B of the cylindrical part 22, the boundary part 15 of the coating | coated part 14 of the electric wire 11 and the exposed conductor 12 is shown. Is covered with the cylindrical portion 22, so that the boundary portion 15 can be prevented from being bent and the like, and intrusion of water or the like from the boundary portion 15 can be prevented.

  In addition, according to the present embodiment, the wire connecting portion 23 is provided so as to form a shape along the cross-sectional shape of the exposed conductor 12, so that the tube of the terminal 20 has a shape along the cross-sectional shape of the exposed conductor 12. The shape portion 22 is deformed and thermocompression bonded, and a large force does not act on the pressure-bonding die 40.

  Moreover, according to this embodiment, since the wire connection part 23 is formed by the method of crimping while energizing and heating, the wire connection part 23 can be formed by a method having excellent thermal efficiency.

<Embodiment 2>
The electric wire 50 with a terminal of Embodiment 2 is demonstrated with reference to FIG. 12 thru | or FIG.
The electric wire with terminal 50 of the present embodiment is different from that of the first embodiment in that the cylindrical portion 62 is arranged so as to cover only the exposed conductor 12 portion of the electric wire 11. The same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In the present embodiment, the exposed conductor 12 of the electric wire 11 is disposed on the cylindrical portion 62 of the terminal 60 and is covered with the exposed conductor 12 of the electric wire 11 and the insulating coating 13 as shown in FIGS. 12 and 13. A boundary portion 15 with the covering portion 14 is exposed.

  In the present embodiment, the crimping portion 64 of the cylindrical portion 62 is crimped to the exposed conductor 12 as shown in FIG. 14, and the wire connecting portion 63 is located in a region in front of the crimping portion 64 (near the terminal 11A of the wire 11). Region). In the figure, reference numeral 61 denotes a terminal connection portion connected to the counterpart terminal, and 61A denotes a terminal connection hole 61A.

  Also in this embodiment, the electric wire connection part 63 is crimped to the exposed conductor 12 of the electric wire 11 with a higher crimping force than the crimping part 64 (see FIG. 14). Other configurations are substantially the same as those of the electric wire with terminal 10 of the first embodiment.

  Also in the present embodiment, as in the first embodiment, the contact area between the terminal 60 and the exposed conductor 12 can be increased in the wire connection portion 63 that is crimped by a high crimping force, and the oxide film of the exposed conductor 12 can be increased. Since the destruction is promoted, the electrical connection can be improved.

  Also in the present embodiment, the stress generated by the wire stress such as the vibration of the wire 11 and the bending of the wire 11 is applied to the crimping portion 64 and the wire connecting portion 63 formed in the region near the terminal 11A of the wire 11. Since stress is difficult to be transmitted to the wire, deterioration of the electrical connection state between the electric wire 11 and the terminal 60 is prevented. Furthermore, in this embodiment, since the crimping | compression-bonding part 64 can be formed only by crimping | bonding the cylindrical part 62, it is cheaper than attaching a crimping | compression-bonding member (not shown) to the terminal 60 separately. Therefore, also by this embodiment, the electric wire 50 with a terminal which improved the connection reliability of the terminal 60 and the electric wire 11, and its manufacturing method can be provided.

  Also in this embodiment, since the wire connection portion 63 is provided so as to form a shape along the cross-sectional shape of the exposed conductor 12, the cylindrical shape of the terminal 60 is formed along the cross-sectional shape of the exposed conductor 12. The portion 62 is deformed and thermocompression bonded, and a large force does not act on the crimping die 40.

  Moreover, since the electric wire connection part 63 is formed by the method of crimping while being energized and heated also according to this embodiment, the electric wire connection part 63 can be formed by a method having excellent thermal efficiency.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the manufacturing method described in the above embodiment, the method of forming the wire connecting portion 23 after forming the crimping portion 24 is shown. However, the crimping portion 24 and the wire connecting portion 23 may be formed simultaneously. .
(2) In the above embodiment, the wire connecting portion 23 is formed by crimping the cylindrical portion 22 while energizing and heating. However, the cylindrical portion 22 may be crimped while being heated by another heating method.
(3) In the above embodiment, only one crimping part 24 is formed, but two or more crimping parts may be formed.
(4) In the above embodiment, the crimping portion 24 and the wire connecting portion 23 are formed so as to have a shape along the cross-sectional shape of the electric wire 11 or the conductor 12, but the shape is different from the cross-sectional shape of the electric wire 11 or the conductor 12. You may form the crimping | compression-bonding part and electric wire connection part.

DESCRIPTION OF SYMBOLS 10,50 ... Electric wire with a terminal 11 ... Electric wire 11A ... Terminal 12 ... Exposed conductor 13 ... Insulation coating 14 ... Covering part 15 ... Boundary part 20, 60 ... Terminal 21, 61 ... Terminal connection part 22, 62 ... Cylindrical part 22A, 62A: Conductor arrangement region 22B: Covering portion arrangement region 23, 63 ... Electric wire connection portion 24, 64 ... Crimping portion 30, 40 ... Crimp fitting 31, 41 ... Upper crimp fitting 32, 42 ... Lower crimp fitting 43 ... Energization Part

Claims (6)

An electric wire with a terminal including a conductor made of aluminum or an aluminum alloy and an insulating coating covering the conductor, and a terminal electrically connected to an exposed conductor exposed at an end of the electric wire,
The terminal has a cylindrical portion through which the electric wire can be inserted,
In the tubular part, a crimp part formed by crimping the tubular part in a state where the electric wire is inserted, and
It is a region where the exposed conductor of the cylindrical portion is arranged, and is formed by crimping while heating a conductor arrangement region closer to the end of the electric wire than the crimping portion, and the electric wire and the terminal The electric wire with a terminal provided with the electric wire connection part connected electrically. The said crimping | compression-bonding part is an electric wire with a terminal of Claim 1 formed by crimping | bonding the coating | coated part arrangement | positioning area | region where the coating | coated part covered with the said insulation coating of the said electric wire of the said cylindrical part is arrange | positioned. The said electric wire connection part is an electric wire with a terminal of Claim 1 or Claim 2 provided so that the shape along the cross-sectional shape of the said exposed conductor may be made | formed. An electric wire having a conductor made of aluminum or an aluminum alloy and an insulating coating covering the conductor, and a method of manufacturing an electric wire with a terminal provided with a terminal electrically connected to an exposed conductor exposed at an end of the electric wire, ,
After inserting the electric wire into the cylindrical part through which the electric wire provided in the terminal can be inserted,
While forming the pressure-bonding part by pressure-bonding the cylindrical part,
A region of the tubular portion in which the exposed conductor is disposed, and a conductor placement region closer to the end of the wire than the crimp portion is formed by heating and crimping while forming a wire connection portion. Production method. The manufacturing method of the electric wire with a terminal of Claim 4 which forms the said crimping part by crimping the coating | coated part arrangement | positioning area | region where the coating | coated part covered with the said insulation coating of the said electric wire of the said cylindrical part is arrange | positioned. . 6. The terminal-attached electric wire according to claim 4, wherein the wire connecting portion is formed by crimping the cylindrical portion while energizing and heating a crimping die having a shape along a cross-sectional shape of the exposed conductor. Production method.

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