JP2016004762A - Terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal where the core wires of a plurality of wires are welded to one terminal, and the welding parts are not peeled off.SOLUTION: In a terminal where an electrical contact is provided on the front side in the length direction of a substrate consisting of a conductive metal plate, and a wire connection is provided on the rear side, the surface of the substrate extending from the rear end of the electrical contact with the same height is a welding part, an insulation coating barrel is protruded at the rear end portion of the substrate at a low position via a downward inclination from the rear end of the welding part, core wires exposed at the terminal of a plurality of wires are superposed vertically and joined to the welding part, and the insulation coatings of the wires are superposed vertically before being caulked and crimped by means of the insulation coating barrel.

Description

  The present invention relates to a terminal, and more particularly to a terminal suitable for connecting a core wire exposed at a plurality of wire terminals to one terminal by welding.

  In recent years, aluminum wires that have advantages of light weight and low cost tend to be used instead of copper wires that are widely used as wires for wiring to automobiles. The aluminum electric wire is formed by twisting a strand made of an aluminum-based metal to provide a core wire, and the core wire is covered with an insulating coating made of an insulating resin.

For the connection between the electric wire and the terminal, the core wire exposed at the end of the electric wire is usually crimped and crimped with a core wire barrel provided on the terminal to be electrically connected.
However, in the aluminum electric wire, since an insulating film such as an oxide film is easily formed on the surface of the core wire made of an aluminum-based metal, the core wire is ultrasonically welded to be connected to a terminal and connected to the terminal. Increases connection reliability.

  On the other hand, as a crimping terminal used when connecting the cores of two electric wires to one terminal, as shown in FIG. 7 in Japanese Patent Laid-Open No. 5-152011 (Patent Document 1), an insulation-coated barrel is connected to the terminal 200 as shown in FIG. A terminal 210 is provided in which a tab 210 is disposed inside a core wire barrel 202 provided together with 201, and the core wires 254 a and 255 a of upper and lower electric wires 254 and 255 are brought into contact with upper and lower surfaces of the tab 210.

JP-A-5-152011

The following problems occur when it is necessary to connect the core wires of a plurality of aluminum wires to one terminal by ultrasonic welding or the like.
Specifically, as shown in FIG. 8A, two terminals 100 are provided for the terminal 100 in which the surface of the substrate 101 of the terminal 100 is the welded portion 102 and the insulating coating barrel 103 is provided at the rear end of the substrate 101. The core wires 110a and 111a exposed at the terminals of the electric wires 110 and 111 are vertically stacked and joined to the welded portion 102, and the core wires and the core wires are connected to the terminals. After the joining to the welded portion 102, the insulation coating barrel 103 is crimped to the insulation coating portions 110b and 111b of the electric wires 110 and 111.

  As described above, when the core wires of the two electric wires 110 and 111 are connected to one terminal 100 so as to overlap each other, the center height h1 of the core wire 110a of the upper electric wire 110 and the upper surface height h2 of the core wire 110a after the connection are obtained. A difference in height D1 occurs. In addition, a height difference D2 between the center height h3 of the core wire 111a of the lower electric wire 111 and the upper surface height h4 of the connected core wire 111a occurs. The height difference D1 of the upper electric wire 110 is much larger than the height difference D2 of the lower electric wire 111.

  After connecting the core wires 110a and 111a in the above state, as shown in FIG. 8 (B), the insulation coating portion 110b of the upper electric wire 110 and the insulation coating portion 111b of the lower electric wire 111 are moved up and down by the insulation coating barrel 103. Repeat crimping. Due to the crimping action, a downward load is applied from the upper electric wire 110 to the lower electric wire 111, and the “leading principle”, the front side of the substrate 101 is connected to the core wire 110a of the electric wire 110 in FIG. An upward force indicated by an arrow acts. Therefore, the core wire 110a of the upper electric wire 110 is subjected to a force in a direction to separate from the core wire 111a of the lower electric wire 111, and a force is applied to peel off the core wire 110a from the core wire 111a. As a result, the electrical connection reliability between the upper electric wire 110 and the terminal 100 is reduced.

  As described above, when a force is applied in the direction in which the core wires 110a and 111a that are overlapped and connected in the vertical direction are separated from each other, even if a tab is disposed between the core wires that are vertically stacked as in the above-mentioned Patent Document 1, Since the core wire is separated from the tab, electrical connection reliability cannot be ensured. In addition, if a tab that is interposed between the upper and lower core wires to be connected is provided integrally with the terminal, there is a problem that the shape of the terminal becomes complicated and the cost is increased, and inserting a separate tab requires a lot of work. There is a problem of high costs.

  This invention was made in view of the said problem, and when connecting the core wire of the some electric wire up and down on one terminal, the core wire of the upper wire of a junction part peels from the core wire of the lower electric wire. It is an object of the present invention to improve electrical connection reliability by ensuring that a plurality of core wires are joined together and a core wire and a terminal are joined together.

In order to solve the above problems, the present invention provides:
In the terminal provided with the electric contact part on the front side in the length direction of the substrate made of the conductive metal plate and the electric wire connection part on the rear side,
A surface of the substrate extending at the same height from the rear end of the electrical contact portion is a welded portion, and an insulating coating barrel is provided on the rear end portion of the lower position of the substrate through a downward inclined portion from the rear end of the welded portion. A terminal that protrudes and has a structure in which core wires exposed at the ends of a plurality of electric wires are vertically stacked and joined to the welded portion, and an insulating coating of the electric wires is stacked vertically and crimped by the insulating coating barrel. Is provided.

  As described above, the terminal of the present invention is one in which a plurality of electric wires are stacked one on top of the other and co-crimped with an insulation coating barrel and joined by ultrasonic welding or resistance welding at the weld. If the number of wires to be stacked is two or more, the number of wires is not limited, but 3-6 wires are used for thin wires with a small diameter or medium-sized wires with a small wire diameter, and 2 wires are used for thick wires with a relatively large wire diameter. Is preferred.

  Specifically, when two round-covered electric wires of the same size are attached to a terminal while being stacked one on top of the other, the upper electric wire and the lower The welding surface is positioned at a position obtained by subtracting the thickness dimension of the welded portion of the lower electric wire from the boundary position with the electric wire.

  As described above, when the protruding portion of the insulation coating barrel is at the low position and the welded portion is at the high position, the terminal of the present invention is stacked on the top and bottom and the core wire is overlapped and joined to the high position welded portion. The difference in height between the center height of the portion of the wire that is crimped and crimped by the insulation coating barrel of the wire and the height of the upper surface of the welded portion of the core wire of the upper wire can be reduced. As a result, it is possible to reduce the upward peeling force applied to the welded part from the crimped crimping part, to firmly integrate a plurality of core wires at the welded part and to increase the bonding strength to the terminal, Reliability can be increased.

The terminal of the present invention is an electric wire routed in a vehicle, and is suitably used for an aluminum electric wire (hereinafter abbreviated as an aluminum electric wire) whose core wire is made of an aluminum-based metal.
This is because, as described above, since an insulating film such as an oxide film is easily formed on the surface of the core wire made of an aluminum-based metal in an aluminum electric wire, the electrical connection reliability can be achieved by removing the film by welding and bonding it to the terminal. It is because it can improve sex.

  The electrical contact portion continuing to the front end of the welded portion at the high position may be any of a tab-shaped male terminal, a box-shaped female terminal, and a bolted terminal provided with a bolt hole, and is not limited.

  In the present invention, in a terminal for connecting the core wires of a plurality of electric wires vertically and connecting, the projecting portion of the insulation coating barrel is set to a low position and the welded portion is set to a high position, and the core wires are stacked vertically to overlap the high wires. When joined to the welded portion at the position, the difference in height between the center height of the wire that is crimped and crimped by the insulation coating barrel of the upper wire and the height of the upper surface of the welded portion of the core wire of the upper wire can be reduced. As a result, it is possible to reduce the upward peeling force applied to the welded portion from the crimped crimping portion, to firmly integrate a plurality of core wires at the welded portion, to increase the connection strength to the terminal, and to improve the connection reliability be able to.

The terminal of 1st Embodiment of this invention is shown, (A) is a perspective view, (B) is a front view, (C) is CC sectional view taken on the line of (A). It is a front view which shows the two electric wires connected to the said terminal. It is a front view which shows the state which connected the electric wire shown in FIG. 2 to the said terminal. It is a schematic front view of the apparatus which ultrasonically welds the said terminal and an electric wire. (A) is explanatory drawing of the height position of the terminal of the said invention and a welding part, (B) is explanatory drawing at the time of using the conventional terminal. It is a front view which shows the connection state of the terminal and electric wire of 2nd Embodiment. (A) (B) is a perspective view which shows a prior art example. (A)-(C) are the front views for demonstrating the problem at the time of using the conventional terminal.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show a first embodiment.
The terminal 1 of the first embodiment is formed by punching a copper-based metal plate and then bending it. The terminal 1 is provided with a wire connecting portion 3 on one side (rear side) in the length direction of a substrate 2 made of a strip-shaped flat plate and an electric contact portion 4 on the other side (front side). The substrate 2 has a width W1 that is sufficient to connect one electric wire. In this embodiment, the width W1 of the substrate 2 is 12 mm, and the thickness of the substrate 2 is 2 mm.

  The terminal 1 is a terminal that can be connected to a plurality of electric wires, and the terminal 1 of the present embodiment has two electric wires of the same size stacked one above the other, that is, the upper electric wire 21 and the lower electric wire 22 are stacked one above the other. The insulation coating barrel 5 provided in the connection portion 3 is co-clamped and crimped, and the core wire 21a exposed at the tip of the upper electric wire 21 and the core wire 22a exposed at the tip of the lower electric wire 22 are superposed vertically to perform ultrasonic welding. The joint blocks 25 are joined together to form one joint block 25, and the joint block 25 is joined and connected to the welded portion 6 of the terminal 1. The electrical contact portion 4 is for making electrical connection by contacting an electrical contact portion of a mating terminal (not shown).

  The wire connection part 3 of the terminal 1 is formed by extending the substrate 2 backward from the rear end of the electric contact part 4. The front part of the wire connection part 3 continuing to the rear end of the electrical contact part 4 is a high position part 2a that extends the substrate 2 at the same height as the electrical contact part 4, and the surface of the high position part 2a is the weld part. 6. An inclined portion 2b is provided by inclining the substrate 2 downward from the rear end of the high position portion 2a to be the welded portion 6. The rear end of the inclined portion 2b extends horizontally to provide a low position portion 2c, and the insulating coating barrel 5 projects from both sides in the width direction of the low position portion 2c.

As described above, the substrate 2 is refracted and formed from the high position portion 2a where the welded portion 6 is provided via the inclined portion 2b and the low position portion 2c where the insulating coating barrel 5 is provided.
As shown in FIG. 3, the center height of the electric wire group in the crimping portion in the state where the electric wires are stacked and co-joined with the welded portion 6 of the substrate 2 and co-crimped with the insulating coating barrel 5 is joined. The height H1 of the weld 6 provided on the surface of the high position portion 2a of the substrate 2 of the terminal 1 is set from the relationship with the thickness dimension of the portion.

  From the height center H2 (boundary position S of the electric wires 21 and 22) of the electric wire group consisting of the lower electric wire 22 and the upper electric wire 21 which are stacked and co-crimped by the insulating coating barrel 5 and joined together, the joint portion of the lower electric wire 22 The height position obtained by subtracting the thickness dimension (t1) of 25b is the position of the weld 6. A portion where the core wire 21a of the upper electric wire 21 and the core wire 22a of the lower electric wire 22 are joined to the welded portion 6 of the substrate 2 to form a joining block 25 in which the core wires 21a and 22a are integrated, and its upper half. Becomes the joint 25 a of the upper electric wire 21, and the lower half becomes the joint 25 b of the lower electric wire 22. The lower surface of the joint portion 25b of the lower electric wire 22 is joined to the weld portion 6 of the substrate.

  That is, the boundary between the upper electric wire 21 and the lower electric wire 22 in a state where two round-coated electric wires of the same size are stacked on top and bottom and co-clamped with the insulation coating barrel 5 of the terminal and jointed to the welded portion 6. The welded portion 6 is located at a position obtained by subtracting the thickness dimension t1 of the joint portion 25b of the lower electric wire 22 (1/2 of the thickness t2 of the joint block 25 of the upper and lower electric wires) from the position (center height H2 of the laminated electric wire). As described above, the surface of the high position portion 2a of the substrate 2 is positioned.

The electrical contact portion 4 of the terminal 1 is a bolted terminal provided with a bolt hole 7.
The upper electric wire 21 and the lower electric wire 22 that are connected to the terminal 1 while being stacked in the vertical direction are round-coated electric wires of the same size and are used for the earth circuit. The electric contact portion 4 of the terminal 1 is brought into contact with the vehicle body panel, the bolt hole drilled in the vehicle body panel is communicated with the bolt hole 7 of the terminal 1, and the terminal is bolted to the vehicle body panel through the bolt. Is connected to the vehicle body panel using one terminal 1.

  Both the upper electric wire 21 and the lower electric wire 22 connected to the terminal 1 have core wires 21a, 22a formed by twisting a large number of strands 21s, 22s made of aluminum-based metal with insulating coatings 21b, 22b made of insulating resin. It is covered.

The terminal 1 is placed on the upper surface of the set base 30 of the ultrasonic welding apparatus shown in FIG. 4, and the welded portion 6 of the substrate 2 is set on the upper surface of the anvil 31 provided at the center of the set base 30. The set base 30 has a surface shape that follows the shape of the substrate 2 refracted by the terminal 1 so that the terminal 1 can be stably supported. On the board 2 of the terminal 1 set on the set table 30, the upper electric wire 21 and the lower electric wire 22 are vertically stacked and wired, and the core wires 21 a and 22 a are arranged on the welded portion 6 of the board 2. Thereafter, the horn 32 disposed opposite to the anvil 31 is lowered, and ultrasonic vibration is applied to the strands of the core wires 21a and 22a exposed at the ends of the upper and lower electric wires 21 and 22, and the upper and lower core wires and the lower core wire are loaded. And the welded part 6 of the terminal.
After the ultrasonic welding operation or simultaneously with the ultrasonic welding operation, the insulation coating barrel 5 is crimped and the insulation coatings 21b and 22b of the upper and lower electric wires 21 and 22 are crimped and crimped by the insulation coating barrel 5. Yes.

  Specifically, first, the core wire 22a of the lower electric wire 22 is mounted on the surface of the welded portion 6 of the high position portion 2a of the terminal 1, and the upper electric wire 21 is insulated on the upper surface of the insulating coating 22b of the lower electric wire 22. The covering 21b is placed so as to overlap. Therefore, a distance obtained by summing the thicknesses of the insulating coatings 22b and 21b of the upper and lower electric wires 21 and 22 is provided between the core wire 22a of the lower electric wire on the welded portion 6 and the core wire 21a of the upper electric wire. In this way, the core wires 21a and 22a of the upper and lower electric wires 21 and 22 are set on the welded portion 6 of the substrate 2 supported on the anvil 31 of the ultrasonic welding apparatus in a state where the core wires 21a and 22a are stacked with a gap in the vertical direction.

  Next, the horn 32 of the ultrasonic welding apparatus is lowered to the core wires 21a and 22a of the upper and lower electric wires set on the welded portion 6 to generate ultrasonic vibration. As the horn 32 descends, ultrasonic vibration is applied in a state where the strands 21 s and 22 s of the core wires 21 a and 22 a are pressed, and contact friction is generated between adjacent strands and between the strands and the welded portion 6. And bonded to the contact surface by atomic bonding. As a result, the upper and lower core wires 21 a and 22 a form one joining block 25, and the lower surface of the joining block 25 is joined and fixed to the welded portion 6. That is, the joint portion 25a of the core wire of the upper electric wire 21 and the joint portion 25b of the core wire of the lower electric wire 22 form one joint block 25 and are joined to the weld portion 6 of the terminal 2 in a state where the upper and lower electric wires are co-welded. Are electrically connected.

  As described above, after the core wires 21a and 22a are joined to the core wire welded portion 6 of the terminal 1 by ultrasonic vibration, the terminal insulation barrel 5 is crimped and crimped to the insulation coatings 21b and 22b of the electric wires 21 and 22. .

  As described above, the upper wire core wire 21 a and the lower wire core wire 22 a are ultrasonically welded to the welded portion 6 of the terminal 1, and the upper wire insulation coating 21 b and the lower wire 22 are insulated by the insulation coating barrel 5. The terminal 1 and the upper and lower electric wires 21 and 22 are connected by crimping and crimping with the insulating coating 22b vertically stacked. In this way, the core wires 21a and 22a of the upper and lower electric wires are connected to the terminal 1 by ultrasonic welding, and the insulation coating barrel 5 is crimped and crimped to increase the electrical connection reliability between the upper and lower electric wires 21 and 22 and the terminal 1. Can be connected.

  In the terminal 1 of the present invention, the reason why the height of the low position portion 2c where the insulating coating barrel 5 is provided and the height of the high position portion 2a where the welded portion 6 is provided will be described in detail with reference to FIGS. Describe.

  FIG. 5A shows the terminal 1 of the present invention. The height difference between the center height C1 of the upper electric wire 21 and the upper surface position C2 of the joining block 25 is (z) in a state where the height position of the welded portion 6 provided on the high position portion 2a of the substrate 2 is the position of H1. The height difference between the center height C3 of the lower electric wire 22 and the lower surface position C4 of the joining block 25 is (y). The height difference (z) of the upper electric wire 21 and the height difference (y) of the lower electric wire 22 are substantially the same, and (z) ≈ (y).

  On the other hand, in the terminal of FIG. 5B, similarly to the terminal 100 of the conventional example shown in FIG. 8, the position where the insulation coating barrel 103 is provided and the position where the welding portion 102 is provided is the same height with the substrate 101 horizontal. Yes. While the insulation coatings 21b and 22b of the one upper electric wire 21 and the lower electric wire 22 are crimped by the insulation coating barrel 103, the core wires 21a and 22a are ultrasonically welded to the welded portion 102, and the center height of the upper electric wire 21 is reached. The difference in height between C5 and the height C6 of the upper surface of the joint portion 25a is (x).

(Z) (y) of the present invention has a relationship of (z) <(x), (y) <(x) with respect to (x). That is, when the terminal 1 having the welded portion 6 of the present invention at a high position is used, the distance from the center height C5 of the upper electric wire 21 to the joining block 25 can be greatly reduced.
In addition, the state where one electric wire is crimped to the terminal 100 with welding and an insulation coating barrel is the same as the state where the lower electric wire 22 is welded and crimped to the terminal 100 with an insulation coating barrel. In this state, the height difference (s) between the center height C7 of the lower electric wire 22 and the height C8 of the upper surface of the joint portion 25b is the height difference of the upper and lower electric wires of the present invention when the outer diameter of the lower electric wire 22 is small. Although equivalent to the difference (z) (y), the height difference (s) becomes larger than (z) (y) when the outer diameter of the lower electric wire 22 becomes larger than the outer diameter of the upper electric wire 21.

  In this way, the force applied to the joint when two wires are co-crimped and co-joined from the force applied to the joint when one wire is crimped and joined with the insulation coating barrel. The joint portion 25a of the upper electric wire can be prevented from peeling off from the joint portion 25b of the lower electric wire at the joint portion (joining block 25).

FIG. 6 shows a second embodiment.
In the second embodiment, three electric wires 41, 42, and 43 are stacked one above the other and connected to one terminal 1-B. The terminal 1-B has the same shape as that of the terminal of the first embodiment, and the substrate 2 includes a high position portion 2a where the welded portion 6 is provided, an inclined portion 2b, and a low position portion 2c where the insulating coating barrel 5 protrudes. Is refracted. The height position H1 of the welded portion 6 of the high position portion 2a is determined from the center height (that is, the center position C9 of the intermediate-position electric wire 42) in the state where the three electric wires are stacked one above the other. 41a, 42a, 43a is set to a height position obtained by subtracting half (t3 × 1/2) of the thickness dimension t3 of the joining block 45 in a state in which the welded part 6 is joined by ultrasonic welding. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

  When one terminal 1-B that is attached by stacking three electric wires in the vertical direction has the above-mentioned shape, the lower side where the core wires 41a and 42a of the upper electric wire 41 and the central electric wire 42 are joined to the welded portion 6 of the substrate 2. The force in the direction away from the core wire 43a of the electric wire 43 can be reduced, and the connection reliability of the electric wire to the terminal can be improved.

  As described in the first and second embodiments, the terminal of the present invention is provided with the insulating coating barrel in the low position portion and the welded portion in the high position portion, and stacked in the vertical direction to overlap the core wire to the high position portion. When this is joined to the welded portion, the difference in height between the center height of the portion of the upper wire that is crimped and crimped by the insulation coating barrel and the height of the upper surface of the welded portion of the core wire of the upper wire can be reduced. As a result, it is possible to reduce the upward peeling force applied to the welded part from the crimped crimping part, to firmly integrate a plurality of core wires at the welded part and to increase the bonding strength to the terminal, Reliability can be increased.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. For example, the number of wires that are stacked on and connected to one terminal is not limited to three or less, and even when the number is four or more, peeling of the core wire welded portion can be prevented by providing the welded portion in the high position portion.
Moreover, you may connect a copper electric wire instead of an aluminum electric wire for the electric wire connected to a terminal. Furthermore, the shape of the electrical contact portion of the terminal may be a male terminal as a tab shape instead of a bolt hole, or a female terminal as a box shape.

DESCRIPTION OF SYMBOLS 1 Terminal 2 Board | substrate 2a High position part 2b Inclined part 2c Low position part 3 Electric wire connection part 4 Electrical contact part 5 Insulation coating barrel 6 Welding part 21 Upper electric wire 22 Lower side core wire 21a, 22a Core wire 21b, 22b Insulation coating 25 Joining block

Claims (4)

In the terminal provided with the electric contact part on the front side in the length direction of the substrate made of the conductive metal plate and the electric wire connection part on the rear side,
A surface of the substrate extending at the same height from the rear end of the electrical contact portion is a welded portion, and an insulating coating barrel is provided on the rear end portion of the lower position of the substrate through a downward inclined portion from the rear end of the welded portion. A terminal that protrudes and has a structure in which core wires exposed at the ends of a plurality of electric wires are vertically stacked and joined to the welded portion, and an insulating coating of the electric wires is stacked vertically and crimped by the insulating coating barrel. .   When two round-coated electric wires of the same size are stacked on top and bottom and attached to a terminal, the position of the boundary between the upper electric wire and the lower electric wire is co-crimped with the insulation-coated barrel and co-joined with the weld. The terminal according to claim 1, wherein the welding surface is positioned at a position obtained by subtracting a thickness dimension of a welded portion of the lower electric wire.   2. The method according to claim 1, wherein the wire is formed of a copper-based metal plate and is used for connecting a round-coated electric wire having a circular cross section in which a core wire made of an aluminum-based metal strand is covered with an insulating coating made of an insulating resin. The terminal according to claim 2.   The terminal according to any one of claims 1 to 3, wherein the plurality of electric wires are joined to the weld by applying ultrasonic vibration.

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