JP5636929B2 - Terminal fitting - Google Patents

Description

  The present invention relates to a terminal fitting.

  Patent Document 1 discloses a terminal fitting including an open barrel-shaped insulation barrel portion for crimping an insulating coating of an electric wire at a rear end portion. The insulation barrel portion has a form in which a pair of caulking pieces are extended in a cantilevered manner from the left and right side edges of the substrate portion. When the electric wire is crimped to the insulation barrel portion, the electric wire is placed on the substrate portion set on the anvil of the crimping mold, and the crimper is deformed so that both the right and left caulking pieces are wound around the electric wire. In this terminal fitting, an overlapping-like crimping is performed in which the other caulking piece is overlapped on the outer surface side of one caulking piece.

JP 2006-147223 A

In the terminal fitting described above, the overlapping length of the two crimping pieces in the circumferential direction is sufficiently long, so during the crimping process, before the extended end of the inner crimping piece contacts the insulation coating, The positional relationship is such that the outer caulking piece faces the outer peripheral side of the inner caulking piece. Therefore, there is no possibility that the insulation coating is sandwiched in the circumferential direction between the extended end portions of both the crimping pieces.
However, in order to ensure a sufficiently long overlapping length between the two crimping pieces in the circumferential direction, it is necessary to increase the extension dimension of the crimping piece from the substrate portion.
The present invention has been completed based on the above circumstances, and an object thereof is to prevent biting of an insulating coating while reducing the cost.

As means for achieving the above object, the invention of claim 1 is characterized in that the first caulking piece extends in a cantilever manner from one side edge of the substrate portion and the first side edge of the substrate portion An insulation barrel portion having an open barrel shape in which two caulking pieces are extended in a cantilever manner, and the first extending end of the first caulking piece in the extending direction is provided in the insulation barrel portion. The portion is in contact with the outer periphery of the insulation coating of the electric wire, and the electric wire is crimped in such a manner that the second extending end portion at the front end of the second caulking piece overlaps the outer surface side of the first caulking piece. a and terminal fittings are adapted, wherein the inner surface of the first extending end, a first inner tapered surface of the first crimping piece increases toward its extended end is inclined such that the thin is formed The outer surface of the first extension end is more forward toward the extension end. A first outer tapered surface that is inclined so that the first caulking piece is thin is formed, and the second caulking piece is thinner on the inner surface of the second extending end portion toward the extending end. An inclined second inner taper surface is formed, and a second outer taper surface inclined so that the second caulking piece becomes thinner toward the extension end is formed on the outer surface of the second extension end portion. The second inner tapered surface and the second extending end surface at the distal end in the extending direction of the second extending end portion are continuous with each other at the second inner corner edge portion. The tapered surface, the first outer tapered surface, the second inner tapered surface, and the second outer tapered surface are arranged so as to be aligned in the radial direction, and the second inner corner edge is the first outer tapered surface. It has the characteristic in the place which is contacting so that it may bite into.

<Invention of Claim 1>
When the overlapping length of both crimping pieces in the circumferential direction is shortened, when the first extending end approaches the second extending end while sliding on the outer periphery of the insulation coating at the end of the crimping process In addition, the second extending end is in a position close to the outer periphery of the insulating coating. Therefore, when the inner edge of the first extending end portion is caught or bitten by the insulating coating, a part of the insulating coating pushed by the catching or biting is transferred to the first extending end. The deformation that protrudes to the outer peripheral side is caused between the first extending end and the second extending end, and finally, the protruding portion of the insulating coating is formed between the first extending end and the second extending end . There is a possibility that the crimping may not be completed normally.

In view of this point, in the present invention, a first inner taper surface is formed on the inner surface of the first extension end portion so that the first caulking piece becomes thinner toward the extension end. The corner edge portion of the end portion where the inner surface and the extended end surface are connected to each other is made obtuse, and the corner edge portion is retracted to the outer peripheral side of the first caulking piece. According to this configuration, when the first extending end portion is in sliding contact with the insulating coating at the end of the crimping process, there is no possibility that the obtuse corner portion is caught or bite into the insulating coating. The covering is not deformed so as to be pushed by the first caulking piece and protrude to the outer peripheral side. According to the present invention, it is possible to prevent biting of the insulation coating between the two crimping pieces while reducing the material cost by shortening the overlapping length of the two crimping pieces in the circumferential direction.

Further, by forming a second inner tapered surface inclined so that the second caulking piece becomes thinner toward the extension end on the inner surface of the second extension end , the second extension end of the second extension end The second inner corner edge where the inner surface and the extended end surface are connected has an obtuse angle, and the second inner corner edge is retracted to the outer peripheral side of the second caulking piece. According to this configuration, even if the insulation coating is deformed so that it is pushed by the first extension end and protrudes to the outer peripheral side, the second inner corner edge inside the second extension end Since it is difficult to get caught in the part , the second extending end part rides on the protruding part of the insulating coating from the outer peripheral side. Therefore, biting can be reliably prevented.

Moreover, in the crimping completion state, the areas where the tapered surfaces are not formed of both the crimping pieces do not overlap in the radial direction, and the tapered surface is always present in the area where both the crimping pieces overlap in the radial direction. . Since the area where the tapered surface is formed in the crimping piece is thinner than the area where the tapered surface is not formed, the thickness dimension in the radial direction is kept small in the area where both the crimping pieces overlap. .

The side view showing the terminal metal fitting in the state where the electric wire is not crimped in Embodiment 1. Top view of the terminal fitting when the wire is not crimped Exploded view of crimping part of terminal fitting Rear view showing the state where the insulation barrel and wires are set on the anvil of the crimping die Rear view showing the state where the crimping process has progressed from the state of FIG. Back view showing the state where the crimping process has further advanced from the state of FIG. Partial enlarged view of FIG. Rear view showing the completed crimping process Partial enlarged view of FIG.

<Embodiment 1>
A first embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, the terminal fitting T of the present embodiment is formed into an elongated shape in the front-rear direction as a whole by bending a metal plate material punched into a predetermined shape. The front end side region of the terminal fitting T is a rectangular tube-shaped terminal connecting portion 10 that functions as a connection means with a counterpart terminal (not shown), and the rear end side region of the terminal fitting T connects the electric wire W. Therefore, it is an open barrel-shaped crimping portion 11 for the purpose.

  As shown in FIGS. 1 to 3, the crimping portion 11 is connected to the wire barrel portion 12 for connecting the portion where the conductor Wa is exposed at the front end portion of the electric wire W by crimping, and to the rear of the wire barrel portion 12. It is comprised from the insulation barrel part 13 provided. A portion of the front end side region of the electric wire W behind the exposed region of the conductor Wa (that is, a portion where the conductor Wa is surrounded by the insulating coating Wb) is pressure-bonded to the insulation barrel portion 13. Yes. The crimping | compression-bonding of this crimping | compression-bonding part 11 and the electric wire W is performed using the metal mold | die 30 for crimping, as shown to FIGS.

  The insulation barrel portion 13 is elongated in the front-rear direction (= direction parallel to the axis of the electric wire W in the crimped state) and is curved so as to bulge downward, and cantilevered from the left edge of the substrate portion 14 The first caulking piece 15L having a known shape extending so as to stand up in a shape and the second caulking piece 15R having a known shape extending so as to stand up from the right edge of the substrate portion 14 are configured. As shown in FIG. 4, it has a bilaterally symmetric shape including the shapes of extended end portions 16L, 16R and tapered surfaces 18L, 18R, 20L, 20R, which will be described later. In this insulation barrel portion 13, as shown in FIGS. 8 and 9, the first extending end portion 16L of the first caulking piece 15L contacts the outer periphery of the insulation coating Wb of the electric wire W, and the first extending end thereof The electric wire W is crimped in such a manner that the second extending end portion 16R of the second caulking piece 15R overlaps the outer surface side of the portion 16L in the radial direction.

As shown in FIGS. 4, 7, and 9, the distal end portion in the extending direction of the first caulking piece 15 </ b> L is a first extending end portion 16 </ b> L, and the distal end surface in the extending direction of the first extending end portion 16 </ b> L. Is the first extending end face 17L. When the terminal fitting T is in the unfolded state before bending, the first extending end surface 17L is perpendicular to the inner surface and the outer surface of the first caulking piece 15L and is parallel to the axis of the electric wire W in the crimped state. It is a flat surface.

On the inner surface of the first extending end portion 16L, a first inner taper that is inclined so that the first caulking piece 15L (first extending end portion 16L) becomes thinner toward the extending end of the first caulking piece 15L. A surface 18L is formed. In the first inner corner edge 19L where the first inner tapered surface 18L and the first extending end surface 17L are continuous, the angle formed by the first inner tapered surface 18L and the first extending end surface 17L is an obtuse angle (110 °). . On the other hand, on the outer surface of the first extending end portion 16L, the first caulking piece 15L (first extending end portion 16L) is inclined so as to become thinner toward the extending end of the first caulking piece 15L. An outer tapered surface 20L is formed. In the first outer corner edge portion 21L where the first outer tapered surface 20L and the first extending end surface 17L are continuous, the angle formed by the first outer tapered surface 20L and the first extending end surface 17L is an obtuse angle (110 °). .

The distal end portion in the extending direction of the second caulking piece 15R is a second extending end portion 16R, and the distal end surface in the extending direction of the second extending end portion 16R is a second extending end surface 17R. Yes. When the terminal fitting T is in the unfolded state before bending, the second extending end surface 17R is perpendicular to the inner and outer surfaces of the second caulking piece 15R and parallel to the axis of the electric wire W in the crimping completed state. It is a flat surface.

On the inner surface of the second extending end portion 16R, a second inner taper that is inclined so that the second caulking piece 15R (second extending end portion 16R) becomes thinner toward the extending end of the second caulking piece 15R. A surface 18R is formed. In the second inner corner edge 19R where the second inner tapered surface 18R and the second extending end surface 17R are continuous, the angle formed by the second inner tapered surface 18R and the second extending end surface 17R is an obtuse angle (110 °). . On the other hand, on the outer surface of the second extending end portion 16R, the second caulking piece 15R (second extending end portion 16R) is inclined so as to become thinner toward the extending end of the second caulking piece 15R. An outer tapered surface 20R is formed. In the second outer corner edge 21R where the second outer tapered surface 20R and the second extending end surface 17R are continuous, the angle formed by the second outer tapered surface 20R and the second extending end surface 17R is an obtuse angle (110 °). .

  As shown in FIG. 5, the crimping die 30 is insulated between the anvil 31 and the anvil 31 whose upper surface is curved so as to be recessed so that the insulation barrel portion 13 can be stably placed. In order to sandwich the barrel part 13 and the electric wire W up and down, a crimper 32 provided so as to be movable up and down is provided. The crimper 32 has a concave shape on the lower surface, and is formed with a concave portion for plastic deformation of the caulking piece into a predetermined shape. The lower end side region of the inner surface of the recess is a pair of left and right guide surfaces 34 that are inclined so that the interval in the width direction gradually narrows upward with respect to the movement direction (= vertical direction) of the crimper 32.

  As shown in FIGS. 5, 6, and 8, the upper end portion of the inner surface of the concave portion has a substantially semicircular shape, and the substantially semicircular region on the left half of the substantially semicircular region is the first molding surface 35 </ b> L, Of the semicircular region, a substantially quadrant region on the right half is a second molding surface 35R. The left end (= uppermost end) of the second molding surface 35R is positioned slightly higher than the right end (= uppermost end) of the first molding surface 35L, and the left end of the second molding surface 35R and the right end of the first molding surface 35L are The connecting surface 36 is slightly inclined with respect to the vertical direction of the second molding surface 35R. The connecting surface 36 and the left end portion of the second molding surface 35R are connected at an obtuse angle, and the corner edge portion where the connecting surface 36 and the right end portion of the first forming surface 35L are connected projects in an obtuse angle shape. It has become.

  Next, the process of crimping the electric wire W to the insulation barrel portion 13 will be described. First, with the crimper 32 retracted above the anvil 31, as shown in FIG. 4, the substrate portion 14 of the insulation barrel portion 13 is placed on the upper surface of the anvil 31, and both caulking is performed from above the substrate portion 14. The electric wire W is set so as to be pushed between the pieces 15L and 15R. Next, the crimper 32 is lowered so as to cover the insulation barrel portion 13. In the descending process of the crimper 32, the extended end portions 16L, 16R of the both crimping pieces 15L, 15R are slidably contacted with the guide surface 34, and are deformed so as to approach each other in the width direction.

  When the crimper 32 is further lowered, the first extending end portion 16L is in sliding contact with the first molding surface 35L, so that the first caulking piece 15L is curved and deformed so as to cover the electric wire W from the upper left side. At the same time, the second extending end portion 16R is in sliding contact with the second molding surface 35R, so that the second caulking piece 15R is curved and deformed so as to cover the electric wire W from the upper right side. Then, as shown in FIG. 5, the first caulking piece 15L and the second caulking piece 15R approach, and the first extending end portion 16L (first extending end surface 17L) and the second extending end portion 16R (second The extended end face 17R) is opposed to the circumferential direction with a slight gap.

  At this time, the first extension end portion 16L and the second extension end portion 16R approach the outer circumference of the electric wire W in the radial direction, but between the first molding surface 35L and the second molding surface 35R. Since there is a difference in height, almost the entire area including the first extending end portion 16L of the first caulking piece 15L is in contact with or close to the outer peripheral surface of the insulating coating Wb of the electric wire W. The second extending end portion 16R of the second crimping piece 15R is in a state in which a slight gap is left with respect to the outer peripheral surface of the insulating coating Wb (= a state in which it is retracted upward with respect to the insulating coating Wb). . In addition, the area | region of the board | substrate part 14 side rather than the 2nd extension end part 16R among the 2nd crimping pieces 15R is contact | abutting to the insulation coating Wb.

  In the state shown in FIG. 5, the first caulking piece 15L (first extension) is formed on the inner surface of the first extension end portion 16L (that is, the surface facing the insulating coating Wb) toward the first extension end surface 17L. Since the first inner tapered surface 18L is formed so that the end portion 16L is thin, the first inner corner edge portion 19L is retracted upward with respect to the outer peripheral surface of the insulating coating Wb. It has become.

  When the lowering of the crimper 32 slightly proceeds from the state shown in FIG. 5, the first extending end portion 16L and the second extending end portion 16R approach in the circumferential direction as shown in FIGS. 1 The inner corner edge 19L approaches the outer periphery of the insulating coating Wb in the radial direction. The first inner corner edge 19L is formed on the outer peripheral surface of the insulating coating Wb by forming the first inner tapered surface 18L. The non-contact state retracted radially outward (= upward) is maintained. Further, the second inner corner edge 19R is located above the first outer corner edge 21L.

  When the crimper 32 is further lowered from this state, as shown in FIG. 9, the second inner corner edge portion 19R comes into sliding contact with the first outer tapered surface 20L, and as shown in FIGS. 16L and the 2nd extension end part 16R will be in the state which overlaps in radial direction (= up-down direction), and crimping | compression-bonding is completed. At this time, the second inner corner edge portion 19R abuts against the first outer tapered surface 20L, and at least the region on the extension end side of the first inner tapered surface 18L and the first outer tapered surface 20L, and the first The two inner tapered surfaces 18R and the second outer tapered surface 20R are arranged so that at least the region on the extending end side is aligned in the radial direction.

  While the crimper 32 is lowered from the position of FIG. 6 to the position of FIG. 8 and pressure bonding proceeds, the first inner corner edge 19L abuts the outer periphery of the insulating coating Wb and pushes the insulating coating Wb in the circumferential direction. A deformation occurs in which a part of the pressed insulating coating Wb protrudes radially outward (= upward). However, at the time when the first inner corner edge 19L starts to press the insulation coating Wb, the second extending end surface 17R is already at the same position as the first extending end surface 17L in the circumferential direction, or the second inner end The distal end portion of the tapered surface 18R is in a positional relationship facing the first outer tapered surface 20L in the radial direction (= from above). That is, there is no gap between the first extension end portion 16L and the second extension end portion 16R so that the insulating coating Wb can be sandwiched in the circumferential direction. Accordingly, the insulating coating Wb pushed upward by the first inner corner edge portion 19L protrudes upward from the first extension end portion 16L (first extension end surface 17L, first inner corner edge portion 19L) and the second extension. It abuts against the inner surface of the second caulking piece 15R without being sandwiched in the circumferential direction between the end portion 16R (second extending end surface 17R, second inner corner edge portion 19R).

  In the terminal fitting T of the present embodiment, since the overlapping length of the first caulking piece 15L and the second caulking piece 15R in the circumferential direction is shortened, at the end of the crimping process, as shown in FIG. When the end portion 16L approaches the second extending end portion 16R in the circumferential direction while being in sliding contact with the outer periphery of the insulating coating Wb, the second extending end portion 16R is in a position approaching the outer periphery of the insulating coating Wb. . Therefore, when the first inner corner edge portion 19L is caught or bite into the insulating coating Wb in the process of pressing from the state shown in FIG. 5, one of the insulating coatings Wb pressed by the hooking or biting. There is a possibility that the portion may be deformed so as to protrude toward the outer peripheral side while entering the gap between the first extending end portion 16L and the second extending end portion 16R. In this case, eventually, the protruding portion of the insulating coating Wb may be caught between the first extending end portion 16L and the second extending end portion 16R, and the crimping may not be completed normally. .

  In view of this point, in the present embodiment, the first inner tapered surface 18L that is inclined so that the first caulking piece 15L becomes thinner toward the extending end is formed on the inner surface of the first extending end portion 16L. The first inner end edge 16L has an obtuse angle at the first inner corner edge 19L where the inner surface (= first inner tapered surface 18L) and the first extension end surface 17L are continuous, and this first inner corner edge. 19L was retracted to the outer periphery side of the first caulking piece 15L. According to this configuration, when the first extending end portion 16L is in sliding contact with the insulating coating Wb at the end of the crimping process (the state shown in FIG. 5), the obtuse angled first inner corner edge 19L is the insulating coating Wb. Therefore, the insulation coating Wb is not deformed so as to be pushed by the first caulking piece 15L and protrude toward the outer peripheral side. Therefore, according to the present embodiment, it is possible to prevent the insulation coating Wb from being caught between the two crimping pieces 15L and 15R while reducing the material cost by shortening the overlapping length of the two crimping pieces 15L and 15R in the circumferential direction. ing.

  Further, the second extending end 16R is formed on the inner surface of the second extending end 16R so that the second caulking piece 15R becomes thinner toward the extending end. 16R has an obtuse angle at the second inner corner edge 19R where the inner surface (= second inner taper surface 18R) and the second extending end face 17R are continuous, and the second inner corner edge 19R is a second crimping piece. 15R is retracted to the outer peripheral side. According to this configuration, even if the insulating coating Wb is pushed by the first extending end portion 16L and deformed so as to protrude to the outer peripheral side, it is difficult to be caught by the second inner corner edge portion 19R. The second extending end portion 16R rides on the protruding portion of the insulating coating Wb from the outer peripheral side. Therefore, biting can be reliably prevented.

  Further, the second inner tapered surface 18R is formed so as to be aligned in the radial direction with respect to the first inner tapered surface 18L in the crimping completed state. According to this configuration, in the crimped state, the areas where the inner tapered surfaces 18L and 18R are not formed do not overlap in the radial direction in both the crimping pieces 15L and 15R, and both the crimping pieces 15L and 15R The inner tapered surfaces 18L and 18R always exist in the region overlapping in the radial direction. Of the crimping pieces 15L and 15R, the region where the inner tapered surfaces 18L and 18R are formed is thinner than the region where the inner tapered surfaces 18L and 18R are not formed. Therefore, both the crimping pieces 15L and 15R overlap. Then, the thickness dimension in the radial direction is kept small.

  Similarly, the second outer tapered surface 20R is formed so as to be aligned in the radial direction with respect to the first outer tapered surface 20L in a crimping completed state. According to this configuration, the areas where the outer tapered surfaces 20L and 20R are not formed in both the crimping pieces 15L and 15R do not overlap in the radial direction when the crimping is completed, and both the crimping pieces 15L and 15R The outer tapered surfaces 20L and 20R always exist in the region overlapping in the radial direction. Of the crimping pieces 15L and 15R, the region where the outer tapered surfaces 20L and 20R are formed is thinner than the region where the outer tapered surfaces 20L and 20R are not formed, so that both the crimping pieces 15L and 15R overlap. Then, the thickness dimension in the radial direction is kept small.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above-described embodiment, the extending end portion including the first inner tapered surface of the first caulking piece and the extending end portion including the second inner tapered surface of the second caulking piece are symmetrically shaped. However, the extending end of the first caulking piece and the extending end of the second caulking piece may be asymmetric.
(2) In the above embodiment, the angle formed between the first inner tapered surface and the first extending end surface is 110 ° at the first inner corner edge of the first extending end, but this angle is an obtuse angle. The angle may be smaller than 110 ° or larger than 110 °.
(3) In the above embodiment, the angle formed by the second inner tapered surface and the second extending end surface is 110 ° at the second inner corner edge of the second extending end, but this angle is an obtuse angle. The angle may be smaller than 110 ° or larger than 110 °.
<Reference example>
(1) In the above embodiment, the second inner tapered surface is also formed on the inner surface of the second extending end portion in the same manner as the first caulking piece, but the tapered surface is formed on the inner surface of the extending end portion of the second caulking piece. A form in which the inner surface of the second extending end portion and the extending end surface are connected at a right angle is conceivable.
(2) In the above embodiment, the first outer tapered surface is formed on the outer periphery of the first extending end portion. However, a form in which the tapered surface is not formed on the outer periphery of the first extending end portion is also conceivable.
(3) In the said embodiment, although the 2nd outer side taper surface was formed in the outer periphery of a 2nd extension end part, the form which does not form a taper surface in the outer periphery of a 2nd extension end part is also considered.
(4) In the above embodiment, in the state where the crimping is completed, the first inner tapered surface of the first caulking piece and the second inner tapered surface of the second caulking piece are aligned in the radial direction. A form is also conceivable in which the first inner taper surface of the first caulking piece and the second inner taper surface of the second caulking piece are in a positional relationship apart from each other in the circumferential direction without being aligned in the radial direction.

T ... Terminal metal fitting W ... Electric wire Wb ... Insulation coating 13 ... Insulation barrel part 14 ... Substrate part 15L ... First caulking piece 15R ... Second caulking piece 16L ... First extending end part 16R ... Second extending end part 18L ... first inner tapered surface 18R ... second inner tapered surface

Claims (1)

The first caulking piece is cantilevered from one side edge of the substrate part and the second caulking piece is cantilevered from the other side edge of the board part. It has an insulation barrel part,
In the insulation barrel portion, the first extending end portion at the distal end in the extending direction of the first caulking piece is in contact with the outer periphery of the insulation coating of the electric wire, and the second caulking portion is in contact with the outer surface side of the first caulking piece. A terminal fitting adapted to crimp the electric wire in a form in which the second extending end of the caulking piece extends in the extending direction ,
The inner surface of the first extending end portion is formed with a first inner tapered surface that is inclined so that the first caulking piece becomes thinner toward the extending end ,
A first outer tapered surface that is inclined so that the first caulking piece becomes thinner toward the extending end is formed on the outer surface of the first extending end,
On the inner surface of the second extending end portion, a second inner tapered surface is formed that is inclined so that the second caulking piece becomes thinner toward the extending end,
A second outer tapered surface is formed on the outer surface of the second extending end portion so that the second caulking piece becomes thinner toward the extending end,
The second inner tapered surface and the second extending end surface at the distal end in the extending direction of the second extending end portion are continuous at the second inner corner edge portion,
In the crimping completed state, the first inner tapered surface, the first outer tapered surface, the second inner tapered surface, and the second outer tapered surface are arranged so as to be aligned in the radial direction, and the second inner corner A terminal fitting, wherein an edge is in contact with the first outer tapered surface so as to bite into the first outer tapered surface .

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