JP2020071908A - Crimp connection terminal - Google Patents

Abstract

To provide a crimp connection terminal capable of ensuring reliability in electrical connection by reliably crimping and retaining a conductor portion of an electric wire by a conductor crimping portion.SOLUTION: In a conductor crimping portion 3, a pair of crimp pieces 3c, 3d comprising a layered structure of an upper layer plate 3a and a lower layer plate 3b are erected in a U shape from both sides. A protrusion 3g protruding to a lower layer plate 3b side is formed on the upper layer plate 3a. A space 3h is provided between the upper layer plate and the lower layer plate 3b around the protrusion 3g, and the conductor portion of an electric wire is elastically fixed by the upper layer plate 3a.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a crimp connection terminal that is internally mounted in, for example, a connector housing and is fitted with a connection terminal of a mating connector.

  With the recent miniaturization, weight reduction, and integration of electric circuits, smaller connection terminals are also required for connecting circuits, and for example, a rod-shaped insertion portion to be inserted into a mating connection terminal is connected. A quadrangle having an outer diameter of about 0.5 mm / 0.5 mm is also used, which has a smaller diameter than the electric wire. There is also a connection terminal used for a fiber electric wire composed of a large number of ultrafine core wires.

JP, 2017-162792, A

  When crimping a fiber wire to a connection terminal, the conductor part of the fiber wire is copper-plated around the ultrafine fiber core wire, and since many wires are twisted together, the conductor part has poor extensibility and plasticity. , It is difficult to elastically fix the fiber electric wire with the small connecting terminal. If the connection terminal is not sufficiently fixed to the fiber electric wire, the fiber electric wire is easily pulled out from the connection terminal, and it is difficult to obtain good conductivity.

  Patent Document 1 is one of conventional examples for connecting fiber electric wires in this way.

  An object of the present invention is to solve the above-mentioned problems and to provide a crimp connection terminal capable of reliably crimping a conductor portion of a fiber electric wire by a conductor crimping portion and ensuring reliability of electrical connection. Especially.

  A crimp connection terminal according to the present invention for achieving the above object is a crimp connection terminal that is formed by punching and bending a single conductive metal plate, and crimps and fixes an electric wire. A connection part for connecting to the connection terminal of the connector is arranged, and a conductor crimping part having a pair of crimping pieces raised from the bottom is arranged at the rear, and the conductor crimping part includes a lower layer plate and both sides of the lower layer part. It is characterized by comprising an upper layer plate which is folded back and superposed on the lower layer plate, and a gap is partially formed in a superposed portion of the lower layer plate and the upper layer plate.

  According to the crimp connection terminal according to the present invention, even in the case of a conductor portion of a fiber electric wire in which a large number of core wires are twisted together, the conductor crimping portion ensures crimp connection, and provides good fixing force and conductivity. It becomes possible to obtain.

3 is a perspective view of the crimp connection terminal of Embodiment 1. FIG. It is a principal part perspective view of the conductor crimping part which notched one part. It is a cross-sectional view of the vicinity of the protrusion of the conductor crimping portion. It is a top view of the punched conductive metal plate. It is a cross-sectional view of the vicinity of the protrusion of the conductor crimping portion in one process of the bending step. It is a perspective view of the electric wire in a state where a part of the insulating coating is left on the tip. It is a perspective view of the crimp connection terminal in the state where the electric wire was fixed. It is a cross-sectional view of the conductor crimping portion in a state where the electric wire is fixed. It is a cross-sectional view in the vicinity of the protrusion of a modified example of the conductor crimping portion with the electric wire fixed. 7 is a perspective view of a crimp connection terminal of Example 2. FIG. It is a principal part perspective view of the conductor crimping part which notched one part. It is a cross-sectional view of the vicinity of the bulge of the conductor crimping portion. It is a top view of the punched conductive metal plate. It is a cross-sectional view of the vicinity of the bulging portion of the conductor crimping portion in one process of the bending step. It is a cross-sectional view of the vicinity of the bulging portion of the conductor crimping portion with the electric wire fixed.

  The present invention will be described in detail with reference to the illustrated embodiments.

  1 is a perspective view of a crimp connection terminal according to a first embodiment of the present invention, FIG. 2 is a perspective view of a main part with a part cut away, and FIG. 3 is a cross-sectional view of the vicinity of a protrusion of a conductor crimp part.

  The crimp connection terminal is made of, for example, thin brass having a thickness of 0.15 mm, and is formed by punching out one conductive metal plate having both surfaces plated with copper, tin, etc., and further bending. For example, a male connecting portion 1 for connecting to the connecting terminal of the mating connector is formed at the front portion of the crimping connection terminal, and an edge crimping portion 2, a conductor crimping portion 3, and a covering crimping portion 4 are sequentially arranged toward the rear side. It is located in.

  In the connection portion 1, a conductive metal plate is folded back from both sides, and a two-layer male insertion end structure is formed in which both edges of the folding pieces 1a and 1b are butted against each other. However, it may be a male type connection part of another shape or a female type connection part.

  In the edge crimping section 2, a pair of crimping pieces 2a, 2b are erected in a U-shape obliquely upward from both sides of the bottom 2c.

  In the conductor crimping portion 3, a pair of crimping pieces 3c and 3d having a laminated structure of an upper layer plate 3a and a lower layer plate 3b are erected in a U-shape obliquely upward from both sides. The side edges of the upper layer plate 3a are abutted at the center of the bottom 3e to form a seam 3f.

  The upper layer plate 3a is formed with two protrusions 3g each having a diameter of 0.4 mm and a height of about 0.05 mm toward the lower layer plate 3b side. A gap 3h is provided near the protrusion 3g between them. Further, a concave portion 3i having a diameter of about 0.2 mm is formed on the surface of the upper layer plate 3a on the opposite side where the protrusion 3g is formed, corresponding to the protrusion 3g. The shape of the protrusion 3g is not limited to a hemispherical shape, and may be another shape such as an ellipse or a trapezoid. The protrusion 3g may be formed before punching the conductive metal plate, or may be punched. It may be formed later.

  In the cover crimping portion 4, as with the edge crimping portion 2, a pair of crimping pieces 4a and 4b are erected in a U-shape obliquely upward from both sides of the bottom portion 4c.

  An actual crimp connection terminal may be provided with a stabilizer for stabilizing the posture in the connector housing, a locking portion for preventing the connector housing from slipping out in the front-rear direction, and the like. Illustration of a known mechanism is omitted.

  FIG. 4 is a plan view showing a state in which the conductive metal plate 5 before being molded into the crimp connection terminal shown in FIG. 1 is punched out, and a dotted line is an inner fold line bent in a forming press described later.

  In the connection portion 1, folding pieces 1a and 1b serving as upper plates are superposed from both sides on a bottom portion 1c serving as a lower plate in order to form a double-structured insertion end.

  In the edge crimping portion 2, side portions 2d and 2e to be crimping pieces 2a and 2b are projected on both sides of the bottom portion 2c.

  The conductor crimping portion 3 is composed of a lower layer plate 3b arranged in the center and upper layer plates 3a continuous on both sides of the lower layer plate 3b, and a protrusion is formed on the upper surface of the upper layer plate 3a in the vicinity of sides 3j, 3k. 3 g are formed. Further, each upper layer plate 3a is punched with a punched elongated hole 3l having a length of 1.0 mm and a width of 0.2 mm in an oblique direction.

  In the cover pressure-bonding portion 4, side portions 4d and 4e which are pressure-bonding pieces 4a and 4b are projected on both sides of the bottom portion 4c.

  A feed piece 6 for connecting the punched crimp connection terminals to each other is provided further behind the coated crimp portion 4, and the covered crimp portion 4 at the rear end of each crimp connection terminal is fed by the coupling piece 7 to the feed piece 6. It is connected to the. The pilot hole 8 provided in the feed piece 6 is used to convey the conductive metal plate 5 in the molding process.

  The punched conductive metal plate 5 as shown in FIG. 4, for example, after being chamfered or surface-treated as necessary, is sequentially bent in each forming step by the forming press while being conveyed by the feed piece 6. It is molded into the crimp connection terminal shown in FIG. FIG. 5 is a cross-sectional view of the conductor crimping portion 3 in one step of this bending step, showing a state immediately before the crimping pieces 3c and 3d are raised.

  FIG. 6 is a perspective view of the electric wire 10 in a state where the insulating coating portion 10a is peeled off from the conductor portion 10b. The electric wire 10 used is, for example, a so-called fiber electric wire, and an individual core wire having a diameter of about 20 μm and made of, for example, amirad fiber filament is plated with metal or copper with a thickness of about 1 μm, and for example, 130 core wires are twisted together. ing. The diameter of the conductor portion 10b of the electric wire 10 is about 0.3 mm, and the outer diameter of the electric wire 10 including the insulating coating portion 10a is about 0.7 to 0.8 mm.

  In the conductor portion 10b, the insulating coating portion 10a is circumferentially cut by a cutter and pulled out, the rear end portion remains at the tip of the conductor portion 10b, and the front end portion protruding from the conductor portion 10b is cut. Therefore, the exposed portion of the conductor portion 10b is provided with the residual portion 10c which was a part of the insulating coating portion 10a, and the conductor portion 10b is not dislocated.

  FIG. 7 is a perspective view showing a state in which the electric wire 10 shown in FIG. 6 is caulked and fixed by the crimp connection terminal shown in FIG. 1 using an electric wire crimping device. The residual portion 10c of the electric wire 10 is crimped by the edge crimping portion 2 so as to surround the conductor portion 10b.

  The exposed conductor portion 10b between the residual portion 10c and the insulating coating portion 10a is crimped by the conductor crimping portion 3. In the insulating coating portion 10a, particularly the side portions 4d and 4e of the coating pressure bonding portion 4 are pressure-bonded so as to be caught in the insulating coating portion 10a. If the electric wire 10 processed in this way is used, the conductor portion 10b does not come apart during crimping.

  Exemplary dimensions of each part of the crimp connection terminal after crimping the electric wire 10 are: width a of the edge crimp portion 2 is 0.9 mm, height b is 1.2 mm, and width c of the conductor crimp portion 3 is 1.0 mm. The height d is 0.75 mm, the length e is 4.5 mm, the width f of the cover pressure-bonding portion 4 is 1.1 mm, and the height g is about 1.5 mm.

  As shown in the cross-sectional view of FIG. 8, the conductor portion 10b in which a large number of core wires are twisted together is clamped by the conductor crimping portion 3 so as to be wrapped from the periphery by the pair of crimping pieces 3c and 3d. Since the crimping pieces 3c and 3d have a laminated structure of the upper layer plate 3a and the lower layer plate 3b that are stacked in two sheets, they can be firmly caulked and fixed to the conductor portion 10b. At this time, the upper layer plate 3a is surrounded by the lower layer plate 3b and compressed, so that the upper layer plate 3a is deformed so as to have a large thickness and is sufficiently adhered to the conductor portion 10b.

  Further, since the upper layer plate 3a is formed with the projection 3g having a gap 3h in the vicinity thereof, even if the conductor portion 10b lacks extensibility and plasticity, the gap 3h around the projection 3g is formed. The elastic force of the upper layer plate 3a, which is the facing metal plate, acts on the conductor portion 10b to increase the fixing force. Further, a concave portion 3i is formed on the opposite surface of the upper plate 3a on which the protruding portion 3g is formed. The concave portion 3i contacts the conductor portion 10b and promotes a fixing force to the conductor portion 10b.

  In the first embodiment, two protrusions 3g are provided on the upper layer plate 3a, but even if the number of the protrusions 3g is different from that of the first embodiment, no great trouble occurs. Further, even if the protrusions 3g are not provided along the joint 3f but are provided in a partially scattered manner, a sufficient fixing force can be obtained and the pulling force of the electric wire 10 can be countered.

  Further, the core wire of the conductor portion 10b is caught by the edge of the punched elongated hole 3l provided in the upper layer plate 3a, and a strong locking force against the pulling force of the conductor portion 10b is obtained. At the same time, even if an insulating coating such as an oxide or sulfide is formed on the surface of the core wire of the conductor portion 10b, the insulating coating is destroyed by the biting of the edge of the punched slot 3l, and the conductor crimping portion 3 and the conductor portion The conductivity with 10b is good.

  Since the core wire of the conductor portion 10b is twisted in the spiral direction, when the punched slot 3l is obliquely arranged in the direction orthogonal to the spiral direction, the core wires cross the punched slot 3l. The biting by the edge becomes more effective.

  In the covering crimp portion 4, the insulating covering portion 10a is fixed by crimping the outside of the insulating covering portion 10a of the electric wire 10 with the pair of crimping pieces 4a and 4b, so that the pulling force acting on the electric wire 10 can be opposed. it can.

  As described above, according to the crimp connection terminal of this embodiment, which is suitable for a fiber electric wire, the conductor portion 10b in which a large number of wires are twisted can be elastically and securely crimp-connected without separating. ..

  FIG. 9 is a transverse cross-sectional view of the protrusion 3g 'of the conductor crimping portion 3 of the modification. The protrusion 3g 'is formed on the lower layer plate 3b toward the upper layer plate 3a, and a gap 3h is provided between the protrusion 3g' and the upper layer plate 3a near the protrusion 3g '. Therefore, the upper layer plate 3a can elastically act on the conductor portion 10b by the gap 3h during pressure bonding.

  10 is a perspective view of a crimp connection terminal of Example 2, FIG. 11 is a partial cutaway perspective view of a main portion, and FIG. 12 is a cross-sectional view of a crimped state in the vicinity of a bulging portion of a conductor crimp section. The same reference numerals as 1 indicate the same parts.

  For example, two bulges 3m are formed along the seam 3f at two locations on the edges of the side portions 3j and 3k of the upper layer plate 3a. The bulging portion 3m is formed by raising the vicinity of the seam 3f between the upper layer plates 3a upward, for example, by raising it into a hemispherical shape with one side cut out, and when the upper layer plates 3a abut each other, the bulging portion becomes a hemispherical shape. A gap 3n is provided between the lower layer plate 3b and the lower layer plate 3b.

  The bulging portion 3m along the joint 3f has a width of 1.0 mm and a depth of 0.7 mm, for example. The bulging portion 3m may be formed into a convex shape by applying pressure from the surface side to the edges of the side portions 3j and 3k of the upper layer plate 3a after punching the conductive metal plate 5. Further, the shape of the bulging portion 3m is not limited to the embodiment and may have another shape.

  FIG. 13 is a plan view of a state in which the conductive metal plate 5 is punched out before being molded into a crimp connection terminal, and FIG. 14 is a cross-sectional view of the conductor crimp portion 3 in one step of this bending step. The conductor crimping portion 3 is composed of a lower layer plate 3b arranged at the center and an upper layer plate 3a continuous with the lower layer plate 3b, and two sets of bulging portions 3m are provided at the edges of the side portions 3j and 3k. Has been formed. In addition, punching long holes 3o having a length of 0.6 mm and a width of 0.2 mm, for example, in the lateral direction are formed at two left and right positions in front of the bottom portion 3e of the upper layer plate 3a. It is formed for the same purpose as the long hole 3l.

  Also in the crimp connection terminal of the second embodiment, since the gap 3n is formed on the lower layer plate 3b side of the bulging portion 3m, the upper layer plate 3a is elastically crimped to the conductor portion 10b of the electric wire 10 during crimping. Even if the conductor portion 10b lacks extensibility and plasticity, a sufficient fixing force can be obtained by the force.

  Further, in the second embodiment, the bulging portion 3m is formed as one hemisphere by combining the upper layer plates 3a on both sides, but it is not necessarily provided along the joint 3f, and it is not necessary to provide the bulging portion 3m at an appropriate position on the upper layer plate 3a. It is also possible to independently form the hemispherical bulging portion 3m.

1 connection part 2 edge crimping part 3 conductor crimping part 3a upper layer plate 3b lower layer plate 3c, 3d crimping piece 3e bottom part 3f seam 3g protrusion 3h, 3n gap 3j, 3k side part 3l, 3o punched long hole 3m swelling Part 4 Cover crimp part 5 Conductive metal plate 10 Electric wire 10a Insulation cover part 10b Conductor part 10c Remaining part

A crimp connection terminal according to the present invention for achieving the above object is a crimp connection terminal formed by punching and bending one conductive metal plate, and is connected to a connection terminal of a mating connector in the front. The connection portion is arranged, and has a pair of crimping pieces raised from the bottom at the rear, and a conductor crimping portion for crimping and fixing the conductor portion of the electric wire is arranged. It consists of an upper layer plate that is folded back on both sides of the lower layer part and laminated on the lower layer plate, and a plurality of gaps are formed between the overlapping parts of the lower layer plate and the upper layer plate , The upper layer plate or the lower layer plate is provided with a plurality of protrusions facing the lower layer plate or the upper layer plate facing each other, and the gap is formed in the vicinity of these protrusions .
Further, the crimp connection terminal according to the present invention is a crimp connection terminal formed by punching and bending one conductive metal plate, and a connecting portion for connecting to a connection terminal of a mating connector is arranged in front of the crimp connection terminal. , A pair of crimping pieces that are erected from the bottom at the rear, and a conductor crimping portion for crimping and fixing the conductor portion of the electric wire is arranged. It consists of an upper layer plate that is folded back and laminated on the lower layer plate, and a plurality of gaps are formed along the seams of the edges of the upper layer plate at the bottom portion, and the upper layer plate is formed. A plurality of bulged portions that are lifted upward are provided in a state where the edges of the seam are in contact with each other, and the gap is formed between the bulged portions and the lower layer plate. And

Claims (5)

A crimp connection terminal which is formed by punching and bending one conductive metal plate, and crimping and fixing an electric wire,
A connecting portion for connecting to the connecting terminal of the mating connector is arranged in the front, and a conductor crimping portion having a pair of crimping pieces raised from the bottom is arranged in the rear,
The conductor crimping part is composed of a lower layer plate and an upper layer plate which is folded back on both sides of the lower layer part and superposed on the lower layer plate, and a gap is partially formed in the superposed part of the lower layer plate and the upper layer plate. A crimp connection terminal characterized by being formed.   The upper layer plate or the lower layer plate is provided with a plurality of protrusions facing the lower layer plate or the upper layer plate facing each other, and the gap is formed in the vicinity of these protrusions. Item 1. The crimp connection terminal according to Item 1.   2. The upper layer plate is provided with a plurality of bulging portions that bulge upward, and the gap is formed between the bulging portions and the lower layer plate. Crimp connection terminal.   The crimp connection terminal according to claim 2 or 3, wherein the upper layer plate is formed with a long hole punched out from the upper layer plate.   The edge crimping portion for fixing the remaining portion of the insulating coating portion arranged at the front end of the electric wire is arranged between the connecting portion and the conductor crimping portion. Crimp connection terminal.

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