JP2016213059A - Terminal-equipped electric wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal-equipped electric wire having sufficient strength by relaxing stress concentration applied to a boundary between a terminal part in which a fastening hole is formed and a conductor.SOLUTION: A terminal-equipped electric wire 11 includes: an electric wire body 13 in which a conductor 15 is covered by a coat 21; an annular terminal part 17 at which a fastening hole 23 is formed by pressuring, heating, melting, then solidifying and molding the conductor 15 exposed by removing the coat 21 of the electric wire body 13; and a reinforcement member 30 covering at least a boundary 40 between the annular terminal part 17 and the conductor 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a terminalized electric wire.

In order to electrically connect the electric wire to another member, the coating of the end of the electric wire may be removed, the exposed conductor may be crimped to the terminal fitting, and the connection may be made via this terminal fitting. In this case, since a terminal metal fitting is required, the component cost increases. On the other hand, the terminal-ized electric wire which welds a conductor (core wire) without using a terminal metal fitting and forms an annular terminal part is proposed (for example, refer to patent documents 1).
When manufacturing such a terminalized electric wire, as shown in FIG. 5A, an annular conductor in which the tip end side of the conductor 515 from which the coating 513 of the electric wire 511 is removed is bent into an annular shape and is in contact with the root portion 517. It is said. Then, the conductor 515 bent in an annular shape is melted by resistance welding or the like to form an annular terminal portion (terminal portion) 520 having a desired shape. Thereby, the terminalized electric wire 521 provided with the bolt fastening hole (fastening hole) 519 in the annular terminal portion 520 is obtained.

Further, like the terminalized electric wire 531 shown in FIG. 5B, the tip end side of the annularly bent conductor 515 is overlapped with the root portion 517 in the vertical direction, thereby preventing a gap from being generated in the annular conductor. In some cases, the molten conductor does not spread sufficiently to the terminal portion that forms the annular terminal portion 520, and the molded product is prevented from having a sinkhole or shrinkage.
According to these terminalized electric wires 521 and 531, since only the conductor 515 is used without using another member such as a terminal fitting, the component cost can be reduced. Moreover, since the annular terminal portion 520 in which the fastening hole is formed is formed by bending and melting the conductor 515 in an annular shape, the tensile strength can be increased.

JP 2011-150841 A

  However, since the terminalized electric wires 521 and 531 described above are continuously connected from the annular terminal portion 520 in which the bolt fastening hole 519 is formed to the conductor 515 (there is no connection portion such as a crimp portion in the crimp terminal) A tensile load or bending stress acting on the electric wire 511 or a rotational torque force at the time of screw tightening that acts when the annular terminal portion 520 is bolted is easily transmitted to the conductor 515. Therefore, when these tensile load, bending stress, rotational torque force, and the like are applied to the annular terminal portion 520, the connection portion 530 solidified in a state where the tip portion of the conductor 515 and the root portion 517 are in contact with each other, There is a possibility that stress concentrates on the boundary portion 540 between the annular terminal portion 520 and the conductor 515 formed in this way, and the conductor 515 near the boundary portion 540 is bent or cut.

  The present invention has been made in view of the above situation, and an object thereof is to provide a terminalized electric wire having sufficient strength by relaxing stress concentration applied to a boundary portion between a terminal portion in which a fastening hole is formed and a conductor. There is.

The above object of the present invention is achieved by the following configuration.
(1) The electric wire main body part in which the conductor is covered with the covering, and the conductor exposed by removing the covering of the electric wire main body part is pressed and heated and melted to be solidified and molded, and the fastening member is inserted. A terminalized electric wire comprising: a terminal portion in which a fastening hole is formed; and a reinforcing member that covers at least a boundary portion between the terminal portion and the conductor.

  According to the terminalized electric wire having the above configuration (1), the boundary between the terminal portion and the conductor formed with a fastening hole such as a bolt is formed by solidifying after the conductor is melted, and the reinforcing member is a boundary portion between the terminal portion and the conductor. Covered by. Therefore, when a tensile load or bending stress acting on the electric wire or a rotational torque force at the time of screw tightening that acts when fixing the fastening hole of the terminal part is applied to the terminalized electric wire, cover the boundary part. The reinforcing member that receives the force can relax the stress concentration at the boundary between the terminal portion and the conductor. Therefore, the conductor near the boundary can be prevented from being bent or cut.

(2) A terminalized electric wire configured as described in (1) above, wherein the reinforcing member covers an outer peripheral portion of the terminal portion.

  According to the terminalized electric wire having the configuration of (2) above, the rotational torque force at the time of screw tightening that the reinforcing member covering the outer peripheral portion of the terminal portion in which the fastening hole is formed acts when the terminal portion is bolted. The stress concentration at the boundary between the terminal portion and the conductor can be further relaxed.

(3) A terminalized electric wire configured as described in (1) or (2) above, wherein the reinforcing member covers the tip of the covering.

  According to the terminalized electric wire having the configuration (3), the reinforcing member covers the tip of the covering, so that the exposed conductor is completely covered by removing the covering. Therefore, the reinforcing member can effectively receive the rotational torque force at the time of screw tightening that acts when the terminal portion is bolted, and can further reduce the stress concentration at the boundary between the terminal portion and the conductor. it can.

  According to the terminalized electric wire according to the present invention, it is possible to relax the stress concentration applied to the boundary portion between the terminal portion in which the fastening hole is formed and the conductor, and to provide a terminalized electric wire having sufficient strength.

  The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

(A) is a principal part perspective view of the terminalized electric wire which concerns on 1st Embodiment of this invention, (b) is a longitudinal cross-section of the terminalized electric wire shown to (a). (A)-(c) is a schematic perspective view for demonstrating the manufacturing method of the terminal-ized electric wire shown in FIG. (A)-(c) is a top view explaining the modification of the terminalized electric wire shown in FIG. (A) is a principal part perspective view of the terminalized electric wire which concerns on 2nd Embodiment of this invention, (b) is a longitudinal cross-section of the terminalized electric wire shown to (a). It is explanatory drawing explaining the conventional terminal-ized electric wire, (a) is explanatory drawing in case a cyclic | annular terminal part is formed from the cyclic | annular conductor which bent the front end side of the conductor cyclically | annularly and contacted the root part, (b) It is explanatory drawing in the case where a cyclic | annular terminal part is formed from the cyclic | annular conductor with which the front end side of the conductor bent in cyclic | annular form was piled up on the root part in the up-down direction.

Embodiments according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the terminalized electric wire 11 according to the first embodiment of the present invention includes an electric wire main body portion 13, a conductor 15, an annular terminal portion (terminal portion) 17, and a reinforcing member 30.

  The electric wire main body 13 is an electric wire in which the conductor 15 is covered with an insulating coating 21. At least one end side of the electric wire main body 13 is formed with an annular terminal portion 17 by pressurizing and heating the conductor 15. In addition, although this embodiment demonstrates to the example the case where the electric wire main-body part 13 is one, the electric wire main-body part 13 may be multiple. In this case, the plurality of conductors 15 are collectively collected and formed.

  The conductor 15 exposed by removing the coating 21 of the electric wire main body 13 may be a single wire or a stranded wire in which a plurality of strands are twisted. Examples of the material of the conductor 15 include an aluminum alloy and a copper alloy. In this embodiment, the covering 21 at the end of the electric wire main body 13 is removed, and the stranded wire conductor 15 made of an aluminum alloy is exposed. In addition, the conductor 15 may be exposed by removing the covering 21 in the middle of the electric wire main body 13. In this case, the conductor 15 is bundled so that the electric wire main body parts 13 on both sides covered by the covering 21 are in the same direction and bent into an annular shape.

  The annular terminal portion 17 is formed by pressurizing and heating the conductor 15 exposed after the covering 21 is removed. That is, as shown in FIG. 2A, the exposed terminal 15 of the annular terminal portion 17 is first bent into an annular shape. At this time, the conductor 15 is overlapped with the root portion 19 in the vertical direction on the tip side. The conductor 15 bent in an annular shape is heated under pressure in a state where it is sandwiched between upper and lower molds of a terminalized electric wire mold (not shown). The conductor 15 is solidified after being melted and formed as an annular terminal portion 17 shown in FIG.

  The annular terminal portion 17 is formed as a flat round terminal having a central hole formed with a fastening hole 23 through which a fastening member such as a bolt is inserted. As described above, the annular terminal portion 17 and the non-formed conductor 15 are solidified after melting the portion where the tip side of the conductor 15 and the root portion 19 overlap as described above, so that the annular terminal portion 17 has an annular shape. The terminal base portion 25 is formed in a trapezoidal shape in which the distance between the side edges gradually decreases from the portion toward the non-shaped conductor 15. In addition, the terminal portion in which the fastening hole is formed is not limited to one in which a conductor bent in an annular shape is melted and solidified by being pressed and heated in a state of being held by a terminal wire mold, and a bundle of conductors may be formed. It may be formed in a predetermined shape having a fastening hole by cold compression molding with a press machine.

  The reinforcing member 30 integrally covers from the terminal root portion 25 of the annular terminal portion 17 to the tip end portion 21 a of the covering 21. The reinforcing member 30 is shown in FIG. 2C by, for example, arranging one end side of the electric wire main body 13 in which the annular terminal portion 17 is formed in a mold and filling the cavity with a molten resin. Thus, it is molded so as to cover from the terminal root portion 25 to the tip end portion 21 a of the covering 21.

The reinforcing member 30 is not limited to the above-described molding, but can be formed by shrinking and curing the heat-shrinkable tube. Further, the material of the reinforcing member 30 is preferably a material that has a predetermined rigidity or more after curing and that has good adhesion to the material of the conductor 15.
Further, in the terminalized electric wire 11 of the first embodiment, the reinforcing member 30 integrally covers from the terminal root portion 25 to the tip end portion 21a of the covering 21, but the present invention is not limited to this. The boundary portion 40 between the annular terminal portion 17 and the conductor 15 formed by melting and solidifying only needs to be covered with at least the reinforcing member 30.

Next, the effect | action of the terminal-ized electric wire 11 which has said structure is demonstrated.
In the terminalized electric wire 11 according to the first embodiment, the boundary portion 40 between the annular terminal portion 17 and the conductor 15 formed by solidifying after the conductor 15 is melted is covered with the reinforcing member 30. Therefore, when a tensile load or bending stress acting on the electric wire main body 13 or a rotational torque force at the time of screw tightening that acts when the annular terminal portion 17 is bolted is applied to the terminalized electric wire 11, The reinforcing member 30 covering 40 receives a force and can relieve stress concentration on the boundary 40 between the annular terminal portion 17 and the conductor 15. Therefore, it is possible to prevent the conductor 15 in the vicinity of the boundary 40 from being bent or cut.

  In addition, according to the terminalized electric wire 11 according to the first embodiment, the reinforcing member 30 covers the tip portion 21a of the covering 21, so that the exposed conductor 15 is completely covered by removing the covering 21. Therefore, the reinforcing member 30 can effectively receive the rotational torque force at the time of screw tightening that acts when the terminal portion 17 is fixed with bolts, and further reduces the stress concentration at the boundary between the terminal portion and the conductor. be able to. Further, by selecting a resin having good adhesion to the metal material of the conductor 15 as the resin material of the reinforcing member 30, it is possible to prevent fluid such as water from entering the coating 21 of the electric wire main body 13. Is possible.

  Therefore, according to the terminalized electric wire 11 according to the first embodiment, the stress concentration applied to the boundary portion 40 between the annular terminal portion 17 in which the fastening hole 23 is formed and the conductor 15 is reduced, and the terminal has sufficient strength. An electric wire 11 can be provided.

Next, a modification of the terminalized electric wire 11 according to the first embodiment of the present invention will be described with reference to FIG.
In the terminalized electric wire 11A shown in FIG. 3A, the space between the annular terminal portion 17A and the non-shaped conductor 15 is the distance between both side edges from the annular portion of the annular terminal portion 17A toward the non-shaped conductor 15. Is a terminal root portion 25A formed in substantially the same rectangular shape. The reinforcing member 30A integrally covers from the terminal base portion 25A of the annular terminal portion 17A to the tip end portion 21a of the covering 21.
According to such a terminalized electric wire 11A, the boundary portion 40 between the annular terminal portion 17A and the conductor 15 formed by solidifying after the conductor 15 is melted is covered with the reinforcing member 30A. When a tensile load or bending stress is applied to the terminalized electric wire 11A, the reinforcing member 30A covering the boundary portion 40 receives a force and concentrates stress on the boundary portion 40 between the annular terminal portion 17A and the conductor 15. Can be relaxed. However, in the reinforcing member 30A that integrally covers the rectangular terminal base portion 25A to the tip end portion 21a of the covering 21, when a rotational torque force at the time of screw tightening is applied to the annular terminal portion 17A, an excessive bending force is generated. It is difficult to prevent the rotational torque force from being transmitted to the boundary portion 40 by acting on the reinforcing member 30A.

  Therefore, like the terminalized electric wire 11B shown in FIG. 3 (b), the reinforcing member 30B integrally covers from the annular portion end of the annular terminal portion 17A including the terminal root portion 25A to the distal end portion 21a of the covering 21. If it comprises, it can prevent the rotational torque force at the time of screw fastening being transmitted to the boundary part 40. FIG. However, in this case, the reinforcing member 30B must cover a wider area than the reinforcing member 30A, and the terminalized electric wire 11B becomes large.

  On the other hand, as shown in FIG. 3C, the terminalized electric wire 11 described above is not formed from the annular portion of the annular terminal portion 17 between the annular terminal portion 17 and the non-formed conductor 15. A terminal root portion 25 is formed in a trapezoidal shape in which the distance between both side edges gradually narrows toward the conductor 15. Therefore, when a rotational torque force during screw tightening is applied to the annular terminal portion 17, the rotational torque force acts on the reinforcing member 30 via the trapezoidal terminal root portion 25, and an excessive bending force is applied to the reinforcing member 30. Since it does not act, it is not necessary for the reinforcing member 30 to cover a wide range, and the terminalized electric wire 11 does not increase in size.

Next, a terminalized electric wire 51 according to a second embodiment of the present invention will be described with reference to FIG. In addition, in the terminalized electric wire 51 which concerns on this 2nd Embodiment, about the same structural member as the terminalized electric wire 11 which concerns on the said 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
The annular terminal portion 17B is formed as a flat round terminal by solidifying after the conductor 15 exposed by removing the coating 21 is pressurized and heated to melt. Between the annular terminal portion 17B and the non-molded conductor 15, a terminal root portion 25A formed in a rectangular shape having substantially the same distance between both side edges from the annular portion of the annular terminal portion 17B toward the non-molded conductor 15; It has become.

As shown in FIG. 4A, the reinforcing member 55 of the second embodiment includes an annular portion 54 that covers the outer peripheral portion of the annular terminal portion 17B in which the fastening holes 23 are formed, and a covering 21 from the terminal root portion 25A. A rectangular portion 52 that covers up to the tip portion 21a is molded integrally.
As shown in FIG. 4B, the annular portion 54 of the reinforcing member 55 covers the outer surface of the annular terminal portion 17 </ b> B excluding the bottom surface 17 a serving as a mounting seat surface when bolted, and the annular portion 54. An opening 56 having a diameter D that allows a nut rotating jig to be inserted together with a nut used for bolt fixing is formed on the upper surface.

Next, the effect | action of the terminalized electric wire 51 which has said structure is demonstrated.
In the terminalized electric wire 51 according to the second embodiment, the outer peripheral portion of the annular terminal portion 17B in which the conductor 15 is solidified after being melted and formed and the fastening hole 23 is formed, and the boundary portion 40 are formed by the reinforcing member 55. Covered together. Therefore, the reinforcing member 55 can effectively receive the rotational torque force at the time of screw tightening that acts when the annular terminal portion 17B is bolted, and the stress on the boundary portion 40 between the annular terminal portion 17B and the conductor 15 Concentration can be eased more.
Therefore, according to the terminalized electric wire 51 according to the second embodiment, in particular, the stress concentration applied to the boundary 40 between the annular terminal portion 17B and the conductor 15 is effectively reduced by the rotational torque force at the time of screw tightening, The terminalized electric wire 51 which is small and has sufficient strength can be provided.

Here, the characteristics of the embodiment of the terminalized electric wire according to the present invention described above are briefly summarized and listed below.
[1] An electric wire main body (13) in which the conductor (15) is covered with a covering (21) and the conductor (15) exposed by removing the covering (21) of the electric wire main body (13) are added. A terminal portion (annular terminal portion 17) formed with a fastening hole (23) through which a fastening member (bolt) is inserted, and solidified after being pressed and heated and melted; and the terminal portion (annular terminal portion 17); A terminalized electric wire (11) comprising: a reinforcing member (30) covering at least a boundary (40) with the conductor (15).
[2] A terminalized electric wire configured as described in [1] above,
The terminalized electric wire (51), wherein the reinforcing member (55) covers an outer peripheral portion of the terminal portion (annular terminal portion 17B).
[3] A terminalized electric wire configured as described in [1] or [2] above,
The terminalized electric wire (11, 51), wherein the reinforcing member (30, 55) covers the tip (21a) of the covering (21).

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

DESCRIPTION OF SYMBOLS 11 ... Terminalized electric wire 13 ... Electric wire main-body part 15 ... Conductor 17 ... Ring terminal part (terminal part)
23 ... Fastening hole 30 ... Reinforcing member

Claims (3)

  An electric wire main body covered with a coating, and a fastening hole through which a fastening member is inserted after the conductor covered with the electric wire main body is removed and exposed to be solidified after being pressurized and heated and melted. A terminalized electric wire comprising: a formed terminal portion; and a reinforcing member that covers at least a boundary portion between the terminal portion and the conductor.   The terminalized electric wire according to claim 1, wherein the reinforcing member covers an outer peripheral portion of the terminal portion.   The terminalized electric wire according to claim 1 or 2, wherein the reinforcing member covers up to the tip of the covering.