JP2016001571A - Terminal connection structure of conductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal connection structure of a conductor in which bonding is made easier than a conventional structure even if the conductor becomes thick, a hole of the terminal is not required for corresponding to the diameter of the conductor, and furthermore the joint is likely to be facilitated even if both metals are dissimilar to each other.SOLUTION: A terminal connection structure of a conductor includes: a terminal 13 which is made of a plate-shaped conductive metal and into which a joint through-hole 23 is drilled; and an electric wire 17 in which a pair of split conductors 19 is formed by removing a covering 15 and dividing the exposed conductor into two from the tip, the pair of these split conductors 19 are joined to the terminal 13 in a state where the terminal 13 is held from the front and rear surfaces 25 and the split conductors 19 are joined to each other in the joint through-hole 23.

Description

  The present invention relates to a conductor terminal connection structure.

2. Description of the Related Art A conductor terminal connection structure in which an electric wire such as a stranded wire having a plurality of core wires is joined to a connected portion such as a terminal by ultrasonic bonding is known (for example, see Patent Document 1).
In such a conductor terminal connection structure, as shown in FIG. 5A, the conductor portion 505 of the electric wire 503 made up of a plurality of core wires 501 is inserted into the conductor width regulating groove of a press die (not shown). . The conductor portion 505 is press-molded into a flat plate shape by being pressed from the thickness direction by a press molding machine in a state where the conductor portion 505 is regulated in the width direction in accordance with the joining width W of the terminal 507. As shown in FIG. 5B, the conductor portion 505 is inserted into the terminal 507 and joined to the terminal 507 by ultrasonic vibration while being pressed by the pressure excitation horn 509.

  Further, as a measure for preventing stress load on the connecting portion in the conductor terminal connection structure shown in FIG. 5, a conductor terminal connection structure shown in FIG. 6 has been proposed. As shown in FIG. 6A, this conductor terminal connection structure is formed in a hole 513 provided in a plate-like terminal 511 having a bolt through hole 517 as shown in FIGS. 6B and 6C. Then, the conductor 515 of the electric wire 512 is passed through, and the conductor 515 is bent and joined. Thereby, the stress (arrow in the figure) applied at the time of pulling the wire is suppressed by the strength of the wire itself. According to the terminal connection structure of this conductor, it is possible to suppress the stress in the peeling (peeling) direction from being applied to the connection portion by bending and joining the conductor 515 through the hole portion 513.

JP 2006-172927 A

  However, in the conductor terminal connection structure shown in FIG. 6, since the hole 513 of the terminal 511 needs to correspond to the core wire diameter (diameter of the conductor 515), the terminal 511 becomes larger as the conductor 515 becomes thicker. . 5 and 6, the thicker the conductor portion 505 and the conductor 515, the thicker the terminal 507 and the terminal 511, so that it becomes difficult to join by welding or the like. Furthermore, the conductor terminal connection structure shown in FIGS. 5 and 6 is such that the conductor portion 505 and the conductor 515 are joined to the terminal 507 and the terminal 511, so that the conductor is different from the terminal (for example, the terminal is a copper alloy and the conductor is aluminum). In the case of an alloy or the like, there is a problem that the joint portion is made of dissimilar metals and is difficult to join as compared with the same metal.

  The present invention has been made in view of the above situation, and its purpose is to facilitate the joining of the conventional structure even when the conductor becomes thicker, and it is not necessary to make the hole portion of the terminal correspond to the conductor diameter. An object of the present invention is to provide a terminal connection structure for conductors that are easy to join even between metals.

The above object of the present invention is achieved by the following configuration.
(1) A terminal made of a plate-like conductive metal and having a through-hole formed therein, and a conductor exposed after removal of the coating is divided into a bifurcated portion from the tip to form a pair of divided conductors. Is connected to the terminal in a state where the terminal is sandwiched from the front and back surfaces, and an electric wire in which the divided conductors are bonded to each other in the bonding through hole.

According to the conductor terminal connection structure having the above configuration (1), the conductor divided into two branches from the tip becomes a pair of divided conductors and is joined in a state of sandwiching the terminal from the front and back surfaces. For this reason, the conductor diameter of each of the divided conductors joined to the front and back surfaces of the terminal is half that of the conductor. Therefore, the thicker the conductor, the thicker the terminal, and the more difficult it is to join, compared to the conventional structure. Further, since the conductor of the electric wire is not inserted into the joint through hole, the terminal does not increase in size as the conductor becomes thicker. Further, the divided conductors are joined to each other in the joint through hole. Thereby, even if the junction part of a conductor and a terminal is junction of dissimilar metals, since the interconductor junction part of the split conductors joined by the joining through-hole receives tensile stress, it can raise an electric wire tensile strength. .
As described above, in the conductor terminal connection structure configured as described in (1) above, tensile stress and bending stress are received at the inter-conductor joint through the joint through-hole, and the conductor-terminal joint between the split conductor and the terminal is electrically connected. Connected to.

(2) A conductor terminal connection structure according to (1), wherein the joint through hole is formed in a non-circular shape.

  According to the conductor terminal connection structure configured as described in (2) above, the bonding through hole is formed in a non-circular shape such as a polygon or an ellipse, whereby the conductor is rotated in the interconductor connecting portion (the bonding through hole The fixing strength in the direction of rotation around the hole center axis is higher than that of a circular hole. As a result, the conductor bonded to the terminal is less likely to rotate relative to the bonding through hole at the inter-conductor bonding portion than when the bonding through hole is circular.

(3) The conductor terminal connection structure according to (1) or (2) above, wherein a distal end side joint portion of the divided conductor on the distal end side from the joint through hole is closer to the proximal end side than the joint through hole. A conductor terminal connection structure characterized by being longer than a base end side joint portion of the divided conductor.

  According to the conductor terminal connection structure configured as described in (3) above, tensile stress and bending stress are received at the inter-conductor joint in the joint through-hole, so that the split conductor and terminal joint on the tip side from the joint through-hole The stress is relaxed. And since the front end side joint part of a division | segmentation conductor becomes long, the part (namely, part which is hard to be influenced by stress and the electrical connection state is stabilized) where stress is relieved increases. Thereby, electrical connection reliability improves between the conductor and the terminal.

  According to the conductor terminal connection structure of the present invention, even if the conductor becomes thicker, it becomes easier to join than the conventional structure, and the hole of the terminal does not need to correspond to the conductor diameter. Even if it is easy to join.

  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. .

It is a perspective view of the electric wire with a terminal which has the terminal connection structure of the conductor concerning one embodiment of the present invention. It is sectional drawing immediately after manufacture of the electric wire with a terminal shown in FIG. It is a perspective view of the terminal shown in FIG. (A) is a perspective view of the electric wire from which the conductor has been removed by removing the coating, and (b) is a perspective view of the electric wire divided into a pair of divided conductors by dividing the conductor into two branches from the tip. It is a principal part perspective view which shows the back | latter stage of the ultrasonic bonding method of the conventional electric wire, (a) is the electric wire which pressed the conductor part into the flat form with the press molding machine, (b) is pressurized with the horn. An electric wire in which a conductor portion is ultrasonically connected to a terminal is shown. (A) is a perspective view of the terminal used for the terminal connection structure of the conventional conductor, (b) is a perspective view of the state which bent and joined the conductor passed through the hole of the terminal shown to (a), (c). FIG. 3 is a side view of (b).

Embodiments according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a terminal-attached electric wire 11 having a conductor terminal connection structure according to an embodiment of the present invention includes a terminal 13 and an electric wire 17.
The terminal 13 is made of a copper alloy that is a plate-like conductive metal, and has a bolt through hole 21 that is a terminal connecting portion and a joint through hole 23 (see FIG. 3).

  The terminal 13 is provided with a bolt through hole 21 and a joint through hole 23 separated along the longitudinal direction of the terminal 13 formed in a rectangular shape. The joint through-hole 23 is formed in a quadrangle in which each hole side (quadratic four sides) is parallel to each terminal side (quadratic four sides) of the terminal 13. In addition, although the terminal 13 of this embodiment is provided with the bolt through-hole 21 as a terminal connection part, it cannot be overemphasized that a terminal connection part can take not only this but a various form.

  In the electric wire 17, a conductor 18 exposed by removing the coating 15 is divided into two forks from the tip to form a pair of divided conductors 19. The conductor 18 made of an aluminum alloy of the electric wire 17 may be made of a plurality of core wires, or may be a single cylindrical shape. Furthermore, the conductor 18 may be a prismatic conductor, a flat flat conductor, or the like. However, since the conductor 18 of the electric wire 17 has to be divided into two parts to form a pair of divided conductors 19, a conductor having a thickness having a certain outer diameter is practically targeted. From this point, the conductor terminal connection structure according to the present embodiment is particularly suitable for use as a driving power line for a driving motor of an electric vehicle or a hybrid vehicle.

  The pair of split conductors 19 are joined to the terminals 13 with the terminals 13 sandwiched from the front and back surfaces 25. At that time, the pair of split conductors 19 are joined to each other in the joint through holes 23.

  As shown in FIG. 2, the terminal-attached electric wire 11 having the conductor terminal connection structure according to the present embodiment has a length L1 of the front end side joint portion 39a of the divided conductor 19 on the front end side from the joint through hole 23. It is configured to be longer than the length L2 of the base end side joint portion 39b of the split conductor 19 on the base end side from the hole 23.

Next, the manufacturing procedure of the electric wire 11 with a terminal which has the terminal connection structure of the conductor which concerns on this embodiment is demonstrated.
To manufacture the terminal-attached electric wire 11 according to the present embodiment, first, the conductor 18 of the electric wire 17 is divided into two forks from the tip. At this time, the conductor 18 can be formed in advance from a cylindrical shape shown in FIG. 4A into a prismatic shape using a press die. By making the divided conductor 19 into a prismatic shape, the strength of the divided conductor 19 after being joined to the terminal 13 is increased compared to the semi-cylindrical shape.

  At this time, the prismatic conductor 18 is preferably provided with a chamfered shape or a required R shape as shown in the drawing. With the chamfered shape or the required R shape, the conductor is smoothly and reliably removed from the conductor width regulating groove (not shown) of the press die.

As shown in FIG. 4B, the conductor 18 formed in a prismatic shape is divided into two branches from the tip. As a dividing method, cutting (slit 27) can be made by a cutter (cutting), or slit 27 can be made by laser cutting.
Further, the pair of divided conductors 19 may be formed from a cylindrical shape by a single processing step.

  Next, the terminal 13 provided with the joint through hole 23 is sandwiched from the front and back surfaces 25 by the pair of divided conductors 19 divided into two forks. In a state where the bonding through hole 23 provided in the terminal 13 is sandwiched from the front and back surfaces 25 by the pair of divided conductors 19, the bonding is performed by a conventional bonding means. Examples of conventional joining means include ultrasonic joining, resistance welding, and laser welding. In this embodiment, a case where ultrasonic bonding is used will be described as an example.

  As shown in FIG. 2, in ultrasonic bonding, a movement regulating jig 31 in which a conductor fitting recess 29 that regulates the movement of the lower divided conductor 19 is formed is used. The movement restricting jig 31 is provided with a pressing protrusion 33 that presses the divided conductor 19 against the joint through hole 23. Above the movement restricting jig 31, a pressurizing vibration horn 35 held by a pressurizer (not shown) is disposed so as to be able to press against the movement restricting jig 31. A pressing projection 33 that presses the divided conductor 19 against the joint through hole 23 is also provided on the pressing surface of the pressure excitation horn 35. Note that the pressing protrusion 33 provided on the pressure excitation horn 35 may be formed slightly smaller than the pressing protrusion 33 of the movement restricting jig 31 in consideration of displacement due to vibration.

  In ultrasonic welding, the pressure excitation horn 35 is ultrasonically vibrated in a state where the pair of split conductors 19 are sandwiched between the movement restricting jig 31 and the pressure excitation horn 35. As the pressure excitation horn 35 vibrates ultrasonically, the divided conductor 19 is heated by friction, and the terminal 13, the divided conductor 19, and the divided conductors 19 are joined. As a result, the inter-conductor joint portion 37 is formed in the joint through hole 23. Further, before and after the conductor extending portion 37 (joining through hole 23) in the conductor extending direction, the distal end side joining portion 39a of the divided conductor 19 on the distal end side from the joining through hole 23 and the proximal end side from the joining through hole 23 are shown. The inter-conductor-terminal joint portion 39 having the base end side joint portion 39b of the divided conductor 19 in FIG.

  In this manner, the terminal-attached electric wire 11 in which the terminal 13 and the electric wire 17 are joined is electrically connected by the inter-conductor-terminal joint portion 39 between the divided conductor 19 and the terminal 13, and the tensile stress and the bending stress are determined. Is received by the interconductor junction 37 through the junction through hole 23. Therefore, the stress burden on the joint part 39 between the conductor terminals to be electrically connected is reduced. In addition, since the joining through hole 23 provided in the terminal 13 is sandwiched and joined by the divided conductor 19, the size of the joining through hole 23 is hardly affected by the diameter of the conductor.

Next, an operation of the terminal-attached electric wire 11 having the conductor terminal connection structure having the above-described configuration will be described.
In the terminal-attached electric wire 11 having the conductor terminal connection structure according to the present embodiment, the conductor 18 divided into two branches from the tip becomes a pair of divided conductors 19 and is joined in a state of sandwiching the terminal 13 from the front and back surfaces 25. The Therefore, in the case of the same conductor diameter, the divided conductor 19 has half the diameter of the conductor to be joined, compared to the conventional structure (see FIG. 6) in which the single conductor 515 is directly joined to the terminal 511. The terminal 13 and the divided conductor 19 are joined by ultrasonic joining, resistance welding, laser welding, or the like. For this reason, the thicker the conductor 18 is, the thicker the terminal 13 becomes and the more difficult it is to join.

  Further, since the conductor 18 of the electric wire 17 is not inserted into the bonding through hole 23, it is not necessary to make the bonding through hole 23 of the terminal 13 correspond to the conductor diameter. The hole width of the joint through hole 23 may be larger or smaller than the conductor width of the divided conductor 19. For this reason, the terminal 13 does not increase in size as the conductor 18 becomes thicker.

  Furthermore, since the divided conductors 19 are bonded to each other in the bonding through hole 23, the bonding portion of the conductor 18 of the electric wire 17 and the terminal 13 is bonded between different metals (the conductor 18 is an aluminum alloy and the terminal 13 is a copper alloy). Even so, since the interconductor joint 37 between the split conductors 19 joined by the joint through hole 23 is subjected to tensile stress, the tensile strength of the electric wire can be increased.

  Thus, in the conductor terminal connection structure described above, the junction through hole 23 is provided in the terminal 13, and the terminal 13 is sandwiched and joined from the front and back surfaces by the divided conductor 19 divided into two forks from the tip. The interconductor conductor 37 is subjected to tensile stress and bending stress, and is electrically connected at the interconductor terminal joint 39 of the divided conductor 19 and the terminal 13.

  Further, in the conductor terminal connection structure according to the present embodiment, the bonding through hole 23 is formed in a quadrangular shape, so that the conductor 18 rotates in the interconductor bonding portion 37 (around the hole central axis of the bonding through hole 23). The fixing strength in the rotation direction is higher than that of the circular hole. As a result, the conductor 18 joined to the terminal 13 is less likely to rotate relative to the joint through hole 23 with respect to the joint through hole 23 than in the case where the joint through hole 23 is circular. The joint through hole of the present invention is not limited to a quadrangle, but can take various shapes, but is preferably formed in a non-circular shape such as a polygon or an ellipse.

  Further, in the conductor terminal connection structure according to the present embodiment, tensile stress and bending stress are received at the inter-conductor joint portion 37 in the joint through hole 23, so that the split conductor 19 and the terminal 13 on the tip side from the joint through hole 23 are connected. Stress on the joint (conductor-terminal joint 39) is relaxed. The split conductor 19 is such that the length L1 of the distal end side joint portion 39a is longer than the length L2 of the proximal end side joint portion 39b, so that the stress is relieved (that is, less susceptible to the stress, The portion where the electrical connection state is stabilized) increases. Thereby, the electrical connection reliability improves between the conductor 18 and the terminal 13 of the electric wire 17.

Therefore, according to the terminal-attached electric wire 11 having the conductor terminal connection structure according to the present embodiment, even if the conductor 18 of the electric wire 17 becomes thicker, it becomes easier to join than the conventional structure, and the joint through hole 23 of the terminal 13 is formed. It is not necessary to correspond to the conductor diameter, and the conductor 18 and the terminal 13 of the electric wire 17 are easily joined regardless of dissimilar metals (the terminal 13 is a copper alloy and the conductor 18 is an aluminum alloy).
In the above embodiment, an aluminum alloy is used for the conductor 18 and a copper alloy is used for the terminal 13, but a combination of other dissimilar metals may be used. Of course, it is needless to say that a combination of the same kind of metals can be used for the conductor 18 and the terminal 13.

Here, the features of the above-described embodiment of the conductor terminal connection structure according to the present invention will be briefly summarized below.
[1] A terminal (13) made of a plate-like conductive metal and having a through-hole (23) drilled;
The exposed conductor (18) after the coating (15) is removed is divided into a forked portion from the tip to form a pair of divided conductors (19). The pair of divided conductors (19) connect the terminal (13) to the front and back surfaces ( 25) and being joined to the terminal (13) in a state of being sandwiched from the electric wire (17) in which the divided conductors (19) are joined to each other in the joining through hole (23),
A conductor terminal connection structure comprising:
[2] A conductor terminal connection structure according to the above [1],
The terminal connection structure of a conductor, wherein the joint through hole (23) is formed in a non-circular shape.
[3] A conductor terminal connection structure according to the above [1] or [2],
The distal end side joining portion (39a) of the divided conductor (19) on the distal end side from the joining through hole (23) is the proximal end side joining of the divided conductor (19) on the proximal end side from the joining through hole (23). A conductor terminal connection structure characterized by being longer than the portion (39b).

  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 13 ... Terminal 15 ... Cover 17 ... Electric wire 18 ... Conductor 19 ... Divided conductor 21 ... Bolt through-hole 23 ... Joint through-hole 25 ... Front and back side 39a ... Front end side junction 39b ... Base end side junction

Claims (3)

A terminal made of a plate-like conductive metal and having a through-hole formed therein;
The exposed conductor with the sheath removed is divided into a pair of split conductors from the tip, and the pair of split conductors are joined to the terminals with the terminals sandwiched from the front and back surfaces, and the joint penetration In the hole, the electric wires where the divided conductors are joined to each other;
A conductor terminal connection structure comprising: The conductor terminal connection structure according to claim 1,
The terminal connection structure for a conductor, wherein the joint through hole is formed in a non-circular shape. The conductor terminal connection structure according to claim 1 or 2,
A conductor terminal connection structure, wherein a distal end side joint portion of the divided conductor on a distal end side with respect to the joint through hole is longer than a proximal end side joint portion of the split conductor on a proximal end side with respect to the joint through hole.

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