JP2018045798A - Wire with terminal, and method of producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire with a terminal, having good electrical connection reliability while reduced in weight.SOLUTION: In a wire with a terminal, the terminal is connected to a core wire exposed portion of a covered wire. A core wire of the covered wire includes: a first conductor part which comprises a plurality of strands made of aluminum or an aluminum alloy and which is disposed on an outer peripheral side of the core wire; and a second conductor part which comprises a plurality of strands made of a material different from that of the first conductor part and which is disposed on an inner peripheral side of the core wire. The terminal includes: a crimped portion which is crimped to the core wire exposed portion and has a plurality of recessed portions formed on a core wire contact surface; and an embedded portion which is embedded into the core wire of the core wire exposed portion to be brought into contact with the second conductor part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric wire with a terminal in which a terminal is connected to a covered electric wire and a method for manufacturing the electric wire.

  In recent years, in order to reduce the weight, it is known that the core wire of the covered electric wire is made of a wire made of aluminum or an aluminum alloy. However, a strong oxide film is easily formed on the surface of the strand made of aluminum or an aluminum alloy. Therefore, in a terminal-attached electric wire in which a terminal is connected to a covered electric wire having a core wire composed of a plurality of strands made of aluminum or an aluminum alloy, a plurality of wires are attached to the core wire contact surface of the crimping portion to be crimped to the core wire exposed portion of the covered electric wire A terminal in which a recess is formed is used, and the oxide film on the surface of the element wire is broken at the opening edge of the recess to ensure the conductivity between the element wire and the terminal (for example, see JP2012-195298A). .

JP 2012-195298 A

  However, in the conventional electric wire with terminal, the oxide film of the strand arranged on the outer peripheral side of the core wire is destroyed by the plurality of concave portions formed on the core wire contact surface of the crimping portion, but arranged on the inner peripheral side of the core wire. The oxide film of the element wire thus formed was not broken, and each element wire arranged on the inner peripheral side of the core wire was not electrically connected to the terminal. That is, only the electrical connection between the wire arranged on the outer peripheral side of the core wire and the terminal can be ensured, and the electrical connection reliability between the core wire and the terminal is low.

  Then, an object of this invention is to provide the electric wire with a terminal which has favorable electrical connection reliability, aiming at weight reduction.

  The electric wire with a terminal of the present invention is an electric wire with a terminal in which a terminal is connected to a core wire exposed portion of the covered electric wire, and the core wire of the covered electric wire is composed of a plurality of strands made of aluminum or an aluminum alloy. A first conductor portion disposed on the outer peripheral side, and a second conductor portion configured by a plurality of strands made of a material different from the first conductor portion and disposed on the inner peripheral side of the core wire. The terminal is a crimping part to be crimped to the core wire exposed part, a crimping part having a plurality of recesses formed on a core wire contact surface, and the second conductor embedded in the core wire of the core wire exposed part And an embedding part in contact with the part.

According to the electric wire with terminal of the present invention, the core wire of the covered electric wire has the first conductor portion including a plurality of strands made of aluminum or an aluminum alloy. Thereby, weight reduction of the electric wire with a terminal can be achieved.
Moreover, according to the electric wire with a terminal of the present invention, the core wire of the covered electric wire has a second conductor portion that is configured by a plurality of strands made of a material different from that of the first conductor portion and is disposed on the inner peripheral side of the core wire. In addition, the first conductor portion is disposed on the outer peripheral side of the core wire. And the terminal connected to this covered electric wire is a crimping part that is crimped to the core wire exposed part, and a crimping part in which a plurality of recesses are formed on the core wire contact surface, and embedded in the core wire of the core wire exposed part And an embedded portion in contact with the second conductor portion. Thereby, the opening edge of the some recessed part formed in the core wire contact surface of a crimping | compression-bonding part with respect to the 1st conductor part comprised by the some strand which consists of aluminum or aluminum alloy, and is arrange | positioned on the outer peripheral side of a core wire. Bite. For this reason, the oxide film on the surface of the strand of the first conductor portion is destroyed, and the electrical conductivity between the first conductor portion and the terminal is ensured. Further, the embedded portion of the terminal embedded in the core wire is in contact with the second conductor portion which is composed of a plurality of strands made of a material different from aluminum or aluminum alloy and is arranged on the inner peripheral side of the core wire. For this reason, each strand of a 2nd conductor part also conduct | electrically_connects through a contact with an embedding part, and the electrical conductivity of a 2nd conductor part and a terminal is ensured.
By these, the electric wire with a terminal which has favorable electrical connection reliability can be provided, aiming at weight reduction of an electric wire.

  Here, the second conductor portion may include a plurality of strands made of copper or copper alloy. According to this, the copper or copper alloy which has favorable electroconductivity is arrange | positioned at the inner peripheral side of a core wire. For this reason, when the embedded portion of the terminal is embedded in the core wire and brought into contact with the second conductor portion, good electrical continuity between each of the strands constituting the second conductor portion and the terminal can be ensured. Thereby, the electrical connection reliability of a terminal and a core wire can further be improved.

  Moreover, the said crimping | compression-bonding part has a pair of crimping piece which crimps the said core wire exposure part, and the said embedding part may be formed in the front-end | tip part of the said crimping piece. According to this, the front-end | tip part of a crimping piece is embed | buried in a core wire, it comprises an embedding part, and this embedding part contacts a 2nd conductor part. For this reason, while being able to ensure the electrical conductivity of a 2nd conductor part and a terminal, the spring bag of a crimping piece is prevented and the crimping force of a core wire exposed part and a crimping | compression-bonding part is maintained, and a 1st conductor part and a terminal are connected. Good electrical conductivity can be secured. Thereby, the electrical connection reliability of a terminal and a core wire can further be improved.

  Furthermore, the manufacturing method of the electric wire with a terminal of the present invention is the manufacturing method of the electric wire with a terminal in which the terminal is connected to the exposed portion of the core wire of the covered electric wire, and is constituted by a plurality of strands made of aluminum or an aluminum alloy. A core wire having a first conductor portion disposed on the first conductor portion and a second conductor portion configured by a plurality of strands of a material different from the first conductor portion and disposed on an inner peripheral side of the core wire; A step of preparing a covered electric wire including an insulating coating covering an outer periphery of the core wire; a step of forming a core wire exposed portion on the covered electric wire; and a plurality of crimping portions to be crimped to the core wire exposed portion on the core wire contact surface A step of preparing a terminal having a crimping part formed with a recess and a buried part embedded in the core wire of the core wire exposed part, and the crimping part of the terminal on the core wire exposed part of the covered electric wire. The core wire is crimped It is embedded the implanting part in the core on the outlet portion, and a step of contacting the second conductor portion.

According to the method for manufacturing an electric wire with a terminal of the present invention, a covered electric wire including a core wire having a first conductor portion made of a plurality of strands made of aluminum or an aluminum alloy is used. Thereby, the electric wire with a terminal reduced in weight can be manufactured.
And the 1st conductor part arrange | positioned at the outer peripheral side of a core wire, and the 2nd conductor part comprised by the several strand of a different material from the 1st conductor part, and are arrange | positioned at the inner peripheral side of a core wire A covered electric wire having a core wire is prepared, and a crimping portion of a terminal is crimped to a core wire exposed portion of the covered electric wire, and an embedded portion is embedded in the core wire and brought into contact with a second conductor portion. Thereby, the opening edge of the some recessed part formed in the core wire contact surface of a crimping | compression-bonding part with respect to the 1st conductor part comprised by the some strand which consists of aluminum or aluminum alloy, and is arrange | positioned on the outer peripheral side of a core wire. Bite. For this reason, the oxide film on the surface of the strand of the first conductor portion is destroyed, and the electrical conductivity between the first conductor portion and the terminal is ensured. Further, the embedded portion of the terminal embedded in the core wire is in contact with the second conductor portion which is composed of a plurality of strands made of a material different from aluminum or aluminum alloy and is arranged on the inner peripheral side of the core wire. For this reason, each strand of a 2nd conductor part also conduct | electrically_connects through a contact with an embedding part, and the electrical conductivity of a 2nd conductor part and a terminal is ensured.
By these, the electric wire with a terminal which has favorable electrical connection reliability can be manufactured, aiming at weight reduction of an electric wire.

  Here, you may form the said core wire exposed part in the position spaced apart from the core wire end. That is, the core wire exposed portion is formed so as to be sandwiched between the portions covered with the insulating coating. Thereby, the crimping | compression-bonding part of a terminal can be crimped | bonded to a core wire exposure part, without destroying arrangement | positioning of the 1st conductor part and 2nd conductor part which comprise a core wire.

  ADVANTAGE OF THE INVENTION According to this invention, the electric wire with a terminal which has favorable electrical connection reliability can be provided, aiming at weight reduction.

It is a perspective view of the electric wire with a terminal concerning the embodiment of the present invention. It is an expansion | deployment perspective view of the terminal used for the electric wire with a terminal shown in FIG. It is sectional drawing of the electric wire with a terminal shown in FIG. 1, (a) is sectional drawing which follows the AA 'line shown in FIG. 1, (b) is along the BB' line shown in FIG. It is sectional drawing. It is a flowchart which shows the manufacturing method of the electric wire with a terminal which concerns on embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4. 1 to 4, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted. Moreover, in FIG. 1 to FIG. 4, the scale and dimensions of each component are exaggerated, and some components may be omitted.

  First, with reference to FIGS. 1-3, the electric wire 1 with a terminal which concerns on embodiment of this invention is demonstrated. FIG. 1 is a perspective view showing a terminal-attached electric wire 1 according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a terminal 30 used in the terminal-attached electric wire 1 shown in FIG. 3 is a cross-sectional view of the terminal-attached electric wire 1 shown in FIG. 1, (a) is a cross-sectional view taken along line AA ′ shown in FIG. 1, and (b) is a cross-sectional view of B It is sectional drawing which follows the -B 'line. 1 to 3, the X direction corresponds to the axial direction (front-rear direction) of the electric wire 1 with terminal, the Y direction corresponds to the width direction (left and right direction) of the electric wire 1 with terminal, and the Z direction is , Corresponding to the height direction (vertical direction).

  As shown in FIG. 1, the terminal-attached electric wire 1 according to the present embodiment has a core wire exposed portion 10 </ b> A where the core wire 10 is exposed at the terminal portion of the covered electric wire 100 whose outer periphery is covered with an insulating coating 20. The terminal 30 is connected to the core wire exposed portion 10A by crimping.

  The covered electric wire 100 has an electrical insulating property such as polyvinyl chloride (PVC) or polyethylene (PE) that covers the outer periphery of the core wire 10 and insulates and protects the core wire 10 from the outside. And an insulating coating 20 made of an insulating material. The insulating coating 20 can be formed by a known method such as extrusion molding so as to cover the outer periphery of the core wire 10.

  In the terminal portion on the distal end side (+ X direction side) of the covered electric wire 100, the insulating coating 20 covering the outer periphery of the core wire 10 is peeled off to form a core wire exposed portion 10A where the core wire 10 is exposed. And the crimping part 31 of the terminal 30 is crimped | bonded to this core wire exposed part 10A. The crimping part 31 to be crimped to the core wire exposed part 10A has a pair of crimping pieces 31B and 31C. The pair of caulking pieces 31B and 31C are caulked so as to embrace the core wire 10 of the core wire exposed portion 10A, and the distal ends of the caulking pieces 31B and 31C are within the core wire of the core wire exposed portion 10A. Embedded.

  As shown in FIG. 2, the terminal 30 of the present embodiment is made of a plate-like conductive material made of copper or a copper alloy, and has a connection portion 39 connected to a counterpart connector or device on one end side (+ X direction). And the other end side (-X direction) has the crimping | compression-bonding part 31 crimped | bonded to the terminal part of the covered electric wire 100.

The connection part 39 is formed in a substantially circular flat plate shape, and a bolt hole 39a is formed in the center for fastening to a counterpart device by bolt fastening.
The crimping part 31 has a bottom part 31A and a pair of crimping pieces 31B and 31C extending along the left and right direction (± Y direction) from both side parts of the bottom part 31A, and is formed on the upper surface (+ Z direction side). A plurality of concave portions 33 are formed in the core contact surface 32 of the surface.

  Then, the pair of crimping pieces 31B and 31C are bent so as to embrace the core wire exposed portion 10A of the covered electric wire 100 disposed on the upper surface of the bottom portion 31A, and the core wire exposed portion 10A is crimped to expose the core wire. The crimping part 31 is crimped to the part 10A (see FIG. 1). Thus, the terminal-attached electric wire 1 in which the terminal 30 is connected to the core wire exposed portion 10A of the covered electric wire 100 is configured. Further, the pair of crimping pieces 31B and 31C are bent so that the respective distal end portions 31Bα and 31Cα are embedded in the core wire 10 of the core wire exposed portion 10A, and the core wire exposed portion 10A is crimped.

  In the terminal-attached electric wire 1 of the present embodiment, only the crimping portion 31 that is crimped to the core wire exposed portion 10A (core wire 10) is provided on the other end side of the terminal 30, and the crimp portion 31 is crimped to the core wire exposed portion 10A. The terminal 30 is connected to the terminal portion of the covered electric wire 100, but is not limited thereto. That is, a crimping portion for crimping the covering portion of the insulating coating 20 may be further provided on the other end side of the terminal 30.

As shown in FIG. 3A, the covered electric wire 100 constituting the terminal-attached electric wire 1 has a substantially circular shape in a cross-sectional view, and the outer periphery of the core wire 10 composed of a plurality of strands is covered with an insulating coating 20. It has been broken.
The core wire 10 includes a first conductor portion 11 composed of a plurality of strands made of aluminum or an aluminum alloy, and a plurality of copper or copper alloys disposed on the inner peripheral side of the first conductor portion 11. And a second conductor portion 12 composed of a strand. When the core wire 10 includes the first conductor portion 11 including a plurality of strands made of aluminum or an aluminum alloy, the terminal-attached electric wire 1 can be reduced in weight.

  In addition, the material of the strand which comprises the 2nd conductor part 12 is not limited to copper or a copper alloy, What is necessary is just conductive materials other than aluminum or aluminum alloy in which a strong oxide film is easy to be formed on the surface. In the present embodiment, the core wire 10 has only the second conductor portion 12 arranged on the inner peripheral side of the first conductor portion 11. For example, the first conductor portion 11 and the second conductor portion 12 are arranged. Between these, the 3rd conductor part comprised by the some strand of a material different from these may be provided.

As shown in FIG. 3B, a crimp portion 31 of the terminal 30 is crimped to the core wire exposed portion 10 </ b> A formed at the terminal portion of the terminal-attached electric wire 1.
A plurality of recesses 33 are formed on the core wire contact surface 32 of the crimping portion 31, and the opening edges 33 a of the plurality of recesses 33 are formed on the first conductor portion 11 disposed on the outer peripheral side of the core wire 10. Biting in. That is, the opening edges 33a of the plurality of recesses 33 of the core wire contact surface 32 bite into the first conductor portion 11 that is arranged on the outer peripheral side of the core wire 10 and is composed of a plurality of strands made of aluminum or aluminum alloy. Thus, the crimping portion 31 is crimped. Thereby, the oxide film formed on the surface of each strand which comprises the 1st conductor part 11 is destroyed, and the electroconductivity with the 1st conductor part 11 and the terminal 30 can be ensured.

  In addition, the tip portions 31Bα and 31Cα of the pair of caulking pieces 31B and 31C constituting the crimping portion 31 are embedded in the core wire of the core wire exposed portion 10A and are arranged on the inner peripheral side of the core wire 10. An embedded portion 34 that contacts the conductor portion 12 is formed. That is, the embedded portion 34 that is disposed on the inner peripheral side of the core wire 10 and is embedded in the core wire of the core wire exposed portion 10 </ b> A with respect to the second conductor portion 12 constituted by a plurality of strands made of copper or copper alloy. Are in contact. Thereby, each strand which comprises the 2nd conductor part 12 arrange | positioned in the inner peripheral side rather than the 1st conductor part 11 is conduction | electrical_connection by the contact with the embedding part 34, and conduction | electrical_connection of adjacent strands. As a result, the terminal 30 is electrically connected, and the electrical conductivity between the second conductor portion 12 and the terminal 30 can be ensured.

  Further, the tip portions 31Bα and 31Cα of the pair of crimping pieces 31B and 31C constituting the crimping portion 31 are embedded in the core wire of the core wire exposed portion 10A, so that the tip portions 31Bα and 31Cα are held in the core wire 10. Thus, the spring bag of each crimping piece 31B, 31C is prevented. Thereby, the crimping | compression-bonding force of 10 A of core wire exposed parts and the crimping | compression-bonding part 31 is maintained, the favorable electrical connection of the 1st conductor part 11 and the terminal 30 can be ensured, and the electrical connection reliability of a terminal and a core wire is improved further. be able to.

  In addition, it is preferable to comprise the 2nd conductor part 12 with the strand which consists of a metal which has favorable electroconductivity like copper or a copper alloy. By configuring the second conductor portion 12 with a plurality of strands made of copper or a copper alloy, the strands can be made to conduct well by mutual contact between adjacent strands. For this reason, only by making the embedding part 34 of the terminal 30 contact a part of the strands constituting the second conductor portion 12, the terminal 30 and the respective strands constituting the second conductor portion 12 are excellent. Conductivity can be ensured, and the electrical connection reliability between the terminal and the core wire can be further improved.

  Then, with reference to FIG. 4, the manufacturing method of the electric wire 1 with a terminal which concerns on embodiment of this invention is demonstrated. In FIG. 4, the X direction corresponds to the axial direction (front-rear direction) of the electric wire 1 with terminal, the Y direction corresponds to the width direction (left and right direction) of the electric wire 1 with terminal, and the Z direction is the height. Corresponds to the direction (vertical direction).

  First, as shown in FIG. 4A, a covered electric wire 100 is prepared by covering a core wire 10 including a plurality of strands with an insulating coating 20. The core wire 10 of this covered electric wire 100 includes a first conductor portion 11 composed of a plurality of strands made of aluminum or an aluminum alloy, and a second conductor portion composed of a plurality of strands made of copper or a copper alloy. 12 and so on. And in the core wire 10 in which the some strand was bundled, it is comprised so that the 2nd conductor part 12 may be arrange | positioned at the inner peripheral side, and the 1st conductor part 11 may be arrange | positioned at the outer peripheral side.

  Next, as shown in FIG. 4B, slits S for dividing the insulating coating 20 are formed along the circumferential direction at a predetermined distance from the covered electric wire 100. Thereby, a separation portion 20 </ b> A separated from the main body of the insulation coating 20 is formed at the terminal portion of the covered electric wire 100.

Subsequently, as illustrated in FIG. 4C, the separation portion 20 </ b> A is slid along the core wire 10 to the tip side (+ X direction side) to expose the core wire 10, thereby forming the core wire exposure portion 10 </ b> A at the terminal portion. At this time, the separating portion 20A is not completely detached from the core wire 10, and the core wire exposed portion 10A is formed between the main body of the insulating coating 20 and the separating portion 20A while the tip of the core wire 10 is covered with the separating portion 20A.
That is, the core wire exposed portion 10A is formed at a position separated from the end of the core wire, and the tip of the core wire 10 is pressed while being covered with the separating portion 20A, thereby preventing the arrangement of the individual wires in the core wire exposed portion 10A from being disturbed. it can.

Thereafter, as shown in FIG. 4D, the crimp portion 31 of the terminal 30 is crimped to the core wire exposed portion 10 </ b> A, and the terminal 30 is connected to the terminal portion of the covered electric wire 100.
The core wire 10 to be crimped to the crimping portion 31 has the first conductor portion 11 disposed on the outer peripheral side and the second conductor portion 12 disposed on the inner peripheral side without breaking the arrangement of the strands. .
Therefore, the crimp portion 31 is crimped to the core wire exposed portion 10 </ b> A so that the opening edges 33 a of the plurality of recesses 33 of the core wire contact surface 32 bite into the first conductor portion 11 disposed on the outer peripheral side of the core wire 10. . Thereby, the oxide film formed on the surface of each strand which comprises the 1st conductor part 11 is destroyed, and the electroconductivity with the 1st conductor part 11 and the terminal 30 can be ensured.
Further, the embedded portion 34 embedded in the core wire of the core wire exposed portion 10 </ b> A contacts the second conductor portion 12 disposed on the inner peripheral side of the core wire 10. Thereby, it can conduct | electrically_connect with the terminal 30 by conduction | electrical_connection by the contact with the embedding part 34, and conduction | electrical_connection of adjacent strands, and can ensure the electrical conductivity of the 2nd conductor part 12 and the terminal 30. FIG.

Finally, as shown in FIG. 4 (e), the separating portion 20A is slid along the core wire 10 to the tip side (+ X direction side) to be detached from the core wire 10, and the separating portion 20A is removed.
Thereby, the electric wire 1 with a terminal in which the terminal 30 was connected to the terminal part of the covered electric wire 100 can be obtained.

  In the manufacturing method shown in FIG. 4, the core wire exposed portion 10 </ b> A is formed at a position separated from the end of the core wire by sliding the separation portion 20 </ b> A toward the distal end side, but the present invention is not limited to this. For example, the core wire exposed portion 10A may be formed at a position separated from the end of the core wire by peeling and removing the insulating coating 20 at a portion separated from the end of the covered electric wire 100 over a predetermined range.

  As mentioned above, although preferred embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Electric wire with a terminal 10 Core wire 10A Core wire exposure part 11 1st conductor part 12 2nd conductor part 20 Insulation coating 30 Terminal 31 Crimp part 31A Bottom part 31B, 31C Clamping piece 32 Core wire contact surface 33 Recess 33a Opening edge 34 Embedding part 100 Covered wire

Claims (5)

In the electric wire with a terminal in which the terminal is connected to the core wire exposed part of the covered electric wire
The core wire of the covered electric wire is composed of a plurality of strands made of aluminum or an aluminum alloy, and a first conductor portion disposed on the outer peripheral side of the core wire, and a plurality of strands made of a material different from the first conductor portion A second conductor portion configured by a wire and disposed on the inner peripheral side of the core wire,
The terminal is a crimping portion that is crimped to the core wire exposed portion, a crimping portion having a plurality of recesses formed on a core wire contact surface, and the second conductor portion embedded in the core wire of the core wire exposed portion An electric wire with a terminal characterized by having an embedding part which contacts.   The said 2nd conductor part is comprised with the some strand which consists of copper or a copper alloy, The electric wire with a terminal of Claim 1 characterized by the above-mentioned.   The said crimping | compression-bonding part has a pair of crimping piece which crimps the said core wire exposed part, The said embedding part is formed in the front-end | tip of the said crimping piece, The Claim 1 or 2 characterized by the above-mentioned. Electric wire with terminal. In the manufacturing method of the electric wire with a terminal in which the terminal is connected to the core wire exposed portion of the covered electric wire,
A first conductor portion made of a plurality of strands made of aluminum or an aluminum alloy and disposed on the outer peripheral side of the core wire, and a plurality of strands made of a material different from the first conductor portion, Preparing a covered electric wire comprising a core wire having a second conductor portion disposed on the inner peripheral side, and an insulating coating covering the outer periphery of the core wire;
Forming a core wire exposed portion on the covered electric wire;
A step of preparing a terminal having a crimping portion to be crimped to the core wire exposed portion and having a plurality of concave portions formed on a core wire contact surface and an embedded portion to be embedded in the core wire of the core wire exposed portion. When,
The crimping portion of the terminal is crimped to the core wire exposed portion of the covered electric wire, the embedded portion is embedded in the core wire in the core wire exposed portion, and the second conductor portion is contacted.
The manufacturing method of the electric wire with a terminal characterized by including.   The manufacturing method of the electric wire with a terminal according to claim 4, wherein the exposed portion of the core wire is formed at a position separated from an end of the core wire.

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