JP2014222645A - Joint structure and joint method of electric wire and terminal - Google Patents

Abstract

An object of the present invention is to prevent a core wire from peeling off when an external force in a pulling direction is applied to an electric wire. An electric wire and terminal bonding structure for bonding an exposed core wire (29) of an electric wire (21) to a terminal (11), the terminal (11) having a first surface (19) to which a bonding portion (28) of the core wire (29) is bonded; And the second surface 17 with which the exposed portion 30 of the core wire 29 is connected to the base end side of the joint portion 28. The first surface 19 and the second surface 17 have different heights. To be formed. [Selection] Figure 3

Description

  The present invention relates to a joining structure and a joining method of an electric wire and a terminal.

  Regarding the joining of electric wires and terminals, a technique is known in which the insulation coating of the electric wires is peeled off to expose the core wire formed from a plurality of strands, and the end of the exposed core wire is joined to the terminal by ultrasonic welding. Yes. In this ultrasonic welding, the end portion of the core wire exposed at the joint receiving portion of the terminal is arranged, and the joint receiving portion of the core wire and the terminal is applied by applying ultrasonic pressure while applying an appropriate pressure to the end portion of the core wire. Bonding is performed by forming a metal bond in

  As this type of technology, the technology of Patent Document 1 is known. In Patent Document 1, the end of the exposed core wire is pressed from the thickness direction and press-molded into a flat plate shape, and then set in a joint receiving portion between a pair of side walls formed on the terminal. Performing sonic welding is disclosed. Thereby, a core wire can be reliably joined to a joint receiving part, without a strand separating during ultrasonic welding.

JP 2006-172927 A

  By the way, in Patent Document 1, a pressurized vibration horn of an ultrasonic bonding apparatus is brought into contact with the core wire set in the joint receiving portion, and ultrasonic vibration that is amplified in the axial direction of the core wire is applied while being pressurized. Along with this vibration, the core wire may deviate from the original installation position in the amplitude direction. Such misalignment of the core wire causes a variation in the bonding state between the core wire and the terminal, which may cause a variation in the bonding area.

  The subject of this invention is made | formed in view of such a problem, and exists in suppressing the motion of the core wire by ultrasonic vibration.

  In order to solve the above-described problem, the present invention provides a joint structure of an electric wire and a terminal for joining an exposed core wire of an electric wire to a terminal, the terminal being joined to a first surface to which a joint portion of the core wire is joined, And a second surface on which the exposed portion of the core wire connected to the base end side of the portion abuts, and the first surface and the second surface are formed with different heights.

  That is, when the core wire and the terminal are ultrasonically bonded, the core wire is given ultrasonic vibration that vibrates in the direction of the core wire, that is, the axial direction of the core wire. For this reason, the first surface and the second surface having different heights are formed on the terminals, respectively, and ultrasonic vibration is applied while the core wire is in contact with these surfaces. Thereby, since the friction at the time of vibrating a core wire can be enlarged, the movement by the vibration of a core wire can be suppressed. In addition, by suppressing the movement of the core wire, vibration can be efficiently transmitted to the joint surface between the core wire and the terminal, so the joint area and strength of the core wire are stable and the reliability of the connection structure between the wire and the terminal is improved. Can be increased.

  In this case, the terminal may be formed such that the second surface forms a protrusion that extends in a direction intersecting the axial direction of the core wire, or may form an inclined surface. . On the inclined surface, the terminal may be inclined in either the vertical direction.

  These surfaces can be easily formed, for example, by press molding a metal plate material.

  Moreover, in order to obtain said connection structure, the electric wire and the terminal joining method of this invention are the 1st surface where a terminal joins the junction part of a core wire, and the exposed part of the core wire connected to the base end side of a junction part. The first surface and the second surface are formed with different heights, the exposed portion of the core wire is brought into contact with the second surface of the terminal, and the core wire The core wire joint portion is joined to the first surface of the terminal by applying ultrasonic vibration that vibrates in the axial direction of the core wire to the core wire while pressing the joint portion of the core wire against the first surface of the terminal. .

  According to the present invention, movement of the core wire due to ultrasonic vibration can be suppressed.

It is a perspective view which shows the external appearance of the terminal used for the junction structure to which this invention is applied. It is a perspective view which shows the external appearance of the exposed core wire of the electric wire used for the joining structure to which this invention is applied. It is a figure which shows a mode that the core wire with which the electric wire was exposed is ultrasonically joined to a terminal. It is the modification which changed the joining direction of the core wire with respect to the terminal. It is a perspective view which shows the external appearance of the terminal used for other embodiment of the junction structure to which this invention is applied. It is a figure which shows a mode that the core wire with which the electric wire was exposed is ultrasonically joined to a terminal in the other joining structure to which this invention is applied.

  Hereinafter, the connection structure and connection method of an electric wire and a terminal according to the present invention will be described based on the drawings. In the following description, in order to facilitate the description, an example using a simple structure terminal using a rectangular plate material will be described. In addition, although the use of the connection structure of the electric wire and the terminal of this embodiment is not specifically limited, For example, it can be used for the connection part of the electric wire connected to the electrical equipment etc. which are mounted in vehicles, such as a motor vehicle. .

  FIG. 1 shows the appearance of the terminals used in the connection structure of this embodiment. The terminal 11 of the present embodiment is formed by subjecting a metal base plate 13 formed in a substantially rectangular planar shape to predetermined processing. In the following description, the direction indicated by the arrow X in FIG. 1 is the longitudinal (longitudinal) direction, the direction indicated by the arrow Y is the width (short) direction, and the direction indicated by the arrow Z is the vertical (thickness) direction (hereinafter referred to as the vertical direction). The same applies to other drawings except FIG. 2). The arrow Z direction defines the upper side of the figure as the upper side of the terminal.

  The base plate 13 is a substantially rectangular flat plate member having a longitudinal direction in the front-rear direction, and an attachment hole 15 through which a bolt or a screw for connecting the terminal 11 to the connected portion is provided at one end side in the front-rear direction. It is done. On the other end side of the base plate 13, a protrusion 17 is provided that extends in the width direction with a predetermined length (for example, a length that is half or more of the entire width of the base plate 13). The protrusion 17 is formed by bending the base plate 13 so as to protrude upward, and has a substantially triangular (inverted V-shaped) cross section. This ridge part 17 can be formed by well-known press molding, for example.

  On the upper surface of the base plate 13 (surface from which the ridge portion 17 protrudes), a bonding surface 19 is formed between the mounting hole 15 and the ridge portion 17 to which the core wire of the electric wire is bonded. The joint surface 19 is formed in a planar shape. Hereinafter, in the present embodiment, the joint surface 19 is appropriately referred to as a first surface, and the protrusion 17 is referred to as a second surface.

  In FIG. 2, the structure of the electric wire of this embodiment is shown. The electric wire 21 of the present embodiment has a structure in which a core wire 25 formed of a plurality of strands 23 is covered with an insulating coating 27. The insulating coating 27 at the tip is peeled off to partially expose the core wire 25. Is an exposed end portion 29 to be brought into contact with the joint surface 19. Prior to joining to the terminal 11, the exposed end portion 29 is subjected to predetermined molding (hereinafter referred to as “preforming” as appropriate) and has a substantially rectangular cross section.

  In the pre-forming, first, the exposed end portion 29 of the electric wire 21 is set in a mold having a groove having a substantially rectangular cross section. Then, the exposed end portion 29 set in the mold is pressed by a pressurizing means at a predetermined pressure and molded. FIG. 2 shows the exposed end 29 after it has been preformed.

  FIG. 3 shows a state in which the pre-formed exposed end portion 29 is ultrasonically bonded to the terminal 11. When ultrasonic bonding is performed, first, the distal end side of the insulating coating 27 of the electric wire 21 is gripped, and the exposed portion 30 on the base end side (insulating coating 27 side) of the exposed end portion 29 of the preformed electric wire 21 is removed. The protrusion 11 is brought into contact with the second surface of the terminal 11. At this time, the electric wire 21 is hold | maintained so that the exposed part 30 may press the protrusion part 17 with a predetermined pressure as needed.

  On the other hand, the exposed end portion 29 is disposed at a position where the joint portion 28 on the distal end side faces the joint surface 19 that is the first surface of the terminal 11. At this time, the joint portion 28 and the joint surface 19 may be in a non-contact state. The exposed end portion 29 is arranged with the axial direction directed in a direction intersecting (for example, substantially orthogonal) with the extending direction of the protruding portion 17.

  In this state, the ultrasonic vibration horn is brought into contact with the distal end portion of the exposed end portion 29 from the direction indicated by the arrow in FIG. 3, and the joining portion 28 of the exposed end portion 29 is pressed against the joining surface 19 of the terminal 11. Give sonic vibration. The ultrasonic vibration is set so that the vibration direction (amplitude direction) substantially coincides with the axial direction of the exposed end portion 29 and intersects the protruding portion 17.

  Thus, when the ultrasonic vibration horn presses the exposed end 29, the exposed end 29 has a first surface (joint surface 19) and a second surface having different heights along the axial direction. It will be in the state contacted with each (protrusion part 17). That is, the exposed end portion 29 vibrates in a state where the joint portion 28 is pressed against the first surface by the ultrasonic vibration horn and the exposed portion 30 is pressed against the second surface so as to follow this. To do. Thus, the exposed end portion 29 is ultrasonically bonded to the bonding surface 19 of the terminal 11 at the bonding portion 28.

  According to the present embodiment, at the time of ultrasonic bonding, the exposed portion 30 of the exposed end 29 is also pressed against the protrusion 17 by pressing the bonded portion 28 of the exposed end 29 against the bonded surface 19. Pressed with. That is, the exposed end portion 29 comes into contact with the joint surface 19 and the protrusion 17 having different heights on the terminal 11 with a predetermined pressure. And the protrusion 17 is arrange | positioned so that the vibration direction of the exposed end part 29 may be crossed. For this reason, the friction between the exposed end portion 29 that vibrates and the terminal 11 increases during ultrasonic bonding. As a result, the exposed end portion 29 can be prevented from moving in the vibration direction with respect to the joint surface 19, and vibration can be efficiently transmitted to the joint surface 19. Therefore, the bonding area and bonding strength of the exposed end portion 29 are stabilized, and the reliability of the connection structure between the electric wire 21 and the terminal 11 can be improved.

  In the present embodiment, the case where the exposed end portion 29 is joined along the front-rear direction of the base plate 13 has been described. However, the direction in which the exposed end portion 29 is joined is not limited to this direction. For example, as illustrated in FIG. 4, the exposed end portion 29 may be disposed along the width direction of the base plate 13 and ultrasonic bonding may be performed. In this case, the protrusion 17 is provided along the front-rear direction of the base plate 13 so as to intersect the axial direction of the exposed end 29. Thereby, similarly to the above, the movement of the exposed end portion 29 during ultrasonic bonding can be suppressed, and the bonding area and bonding strength can be stabilized.

  Next, another embodiment of the wire and terminal connection structure and connection method according to the present invention will be described with reference to the drawings. In addition, in this embodiment, it demonstrates centering on the point which is different from said embodiment, and abbreviate | omits description about the point which is common in said embodiment.

  FIG. 5 shows the appearance of the terminal according to the connection structure of the present embodiment. The terminal 31 of this embodiment is different from the above-described embodiment in that the inclined surface 33 and the stepped surface 35 connected thereto are second surfaces. The inclined surface 33 is formed by bending an end portion on the opposite side of the mounting hole 15 along a line extending in the width direction of the base plate 13 in the front-rear direction of the base plate 13, and is a bonding surface 37 as a first surface. It is formed in a row. The step surface 35 is formed by bending the inclined surface 33 along a line extending along the width direction of the base plate 13, is different in height from the joint surface 37, and is disposed substantially parallel to the joint surface 37. Yes.

  FIG. 6 shows a state in which the pre-formed exposed end portion 29 is ultrasonically bonded to the terminal 31. When ultrasonic bonding is performed, first, the distal end side of the insulating coating 27 of the electric wire 21 is gripped, and the exposed end portion 30 of the proximal end side (insulating coating 27 side) of the exposed end portion 29 of the electric wire 21 is connected to the terminal 31. It is made to contact | abut with the level | step difference surface 35 which is a 2nd surface. On the other hand, the joint portion 28 on the distal end side is disposed at a position facing the joint surface 37 that is the first surface of the terminal 31 at this time, and the joint portion 28 and the joint surface 37 are not in contact with each other. ing.

  In this state, ultrasonic vibration is applied from the direction indicated by the arrow in FIG. 6 while pressing the ultrasonic vibration horn against the exposed end portion 29. The amplitude direction of this ultrasonic vibration is the same as in FIG. As a result, the exposed end portion 29 is brought into contact with the joining surface 37 of the terminal 31 and the exposed portion 30 is brought into contact with the inclined surface 33 and the stepped surface 35, respectively, during ultrasonic bonding. As a result, the bonding portion 28 is ultrasonically bonded to the bonding surface 19 of the terminal 31.

  According to the present embodiment, during the ultrasonic bonding, the exposed end portion 29 acts to press the inclined surface 33 by vibration, so that the friction between the exposed end portion 29 and the terminal 31 increases. Thereby, since it can suppress that the exposed end part 29 moves to a vibration direction with respect to the joint surface 37, a vibration can be efficiently transmitted to the joint surface 37. FIG. Therefore, also in this embodiment, the bonding area and bonding strength of the exposed end portion 29 are stabilized, and the reliability of the connection structure between the electric wire 21 and the terminal 31 can be improved.

  In this embodiment, the example in which the inclined surface 33 and the stepped surface 35 connected to the inclined surface 33 are provided as the second surface has been described. However, if the exposed end portion 29 can be brought into contact during ultrasonic bonding. It suffices to have at least one of them.

  As mentioned above, although embodiment of this invention has been explained in full detail with drawing, the said embodiment is only an illustration of this invention and this invention is not limited only to the structure of the said embodiment. Needless to say, changes in design and the like within the scope of the present invention are included in the present invention.

  For example, in the above-described embodiment, the example in which the ridge portion 17 and the inclined surface 33 are formed as the second surface formed on the terminal has been described. However, the second surface is not limited to these forms. Instead, it is only necessary that the exposed portion 30 of the exposed end portion 29 is in contact with the first end surface and has a height different from that of the first surface during ultrasonic bonding. For example, each of the protrusion 17 and the inclined surface 33 is formed by bending the first surface and rising upward, but instead, it is formed by falling from the first surface. May be. Further, the step surface 35 can be formed at a position lower than the first surface.

11, 31 Terminal 13 Base plate 15 Mounting hole 17 Projection (second surface)
19, 37 Joint surface (first surface)
21 Electric wire 23 Elementary wire 25 Core wire 28 Joint portion 29 Exposed end portion 30 Exposed portion 33 Inclined surface (second surface)
35 Step surface (second surface)

Claims (4)

An electric wire and terminal joining structure for joining an exposed core wire of an electric wire to a terminal,
The terminal includes a first surface to which a joint portion of the core wire is joined, and a second surface to which an exposed portion of the core wire that is connected to a proximal end side of the joint portion abuts, and the first surface. And the said 2nd surface is the junction structure of the electric wire and terminal formed in mutually different height.   The wire and terminal joint structure according to claim 1, wherein the terminal is formed such that the second surface extends in a direction intersecting the axial direction of the core wire.   The said terminal is a joining structure of the electric wire and terminal of Claim 1 in which said 2nd surface makes | forms an inclined surface. In the method of joining the wire and the terminal for joining the exposed core wire of the wire to the terminal
The terminal includes a first surface to which a joint portion of the core wire is joined, and a second surface to which an exposed portion of the core wire that is connected to a proximal end side of the joint portion abuts, and the first surface. And the second surface are formed with different heights,
The exposed portion of the core wire is brought into contact with the second surface of the terminal, and the ultrasonic vibration that vibrates in the axial direction of the core wire is pressed while pressing the joint portion of the core wire against the first surface of the terminal. A method for joining an electric wire and a terminal, in which a joining portion of the core wire is joined to a first surface of the terminal by giving to the core wire.

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