JP5342259B2 - Crimp terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain both high conductivity and mechanical holding force to a conductor and disconnection prevention effect of the conductor compatibly by forming the edge portion of a conductor locking groove in a prescribed angle. <P>SOLUTION: In a crimp style terminal 1 in which a conductor caulking part 11 has a conductor mounting portion 15 to mount a conductor 5 and caulking members 17, 17 to hold the conductor 5, and a plurality of conductor locking grooves 19 are provided in the conductor mounting portion 15, a projection portion 21 is formed on the rear side corresponding to the conductor locking groove 19 of the conductor mounting portion 15 and thereby, the edge portion 23 of the conductor locking groove 19 is formed nearly in a right angle. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a crimp terminal used for connecting a wire harness or the like in a vehicle.

Patent Document 1 and Patent Document 2 each describe “ crimp terminals ”.

  These crimp terminals have a conductor crimping portion for crimping the conductor of the electric wire, and are electrically connected to the conductor by crimping the conductor crimping portion and the conductor and mechanically hold the conductor (crimp connection). .

In any of the crimp terminals, a conductor retaining groove (concave portion) called serration is formed in the conductor mounting portion provided in the conductor crimp portion. FIG. 7 shows a crimp terminal 151 of Patent Document 1, and the serration is composed of a plurality of recesses 153 and 155. When the conductor is pressed against the recesses 153 and 155 during caulking, the edge portions 157 and 159 are formed. By biting into the conductor, the oxide film of the conductor is destroyed (cleaned), the contact area between the conductor and the crimp terminal 151 is increased, and the conductivity (electrical performance) is improved. Further, the edge portions 157 and 159 are formed. The mechanical holding force of the conductor is improved by the wedge action that bites into the conductor.

Further, if the crimp terminal 151, by the angle θ1 of the outer edge portion 159 larger than the angle θ2 of the inner edge portion 157 at both side recesses 155 of the serrations, also, the crimp terminal of Patent Document 2, the serrations By giving various depths to the concave portions to be formed, the conductivity and the mechanical holding function are kept high while preventing breakage of the conductor caused by the biting of the edge.

JP-A-10-125362 Japanese Patent Laid-Open No. 2003-31274

  However, as shown in FIG. 7, the crimp terminal 151 has an inverted trapezoidal shape in which the recesses 153 and 155 become wider toward the opening side. As a result, the angles θ2 and θ1 of the edge portions 157 and 159 are both larger than 90 °. It has become. The edge portion has an angle larger than 90 °. Therefore, when R is large, it becomes difficult to penetrate into the conductor. Therefore, the cleaning effect of the oxide film and the conductivity improving effect due to the increase of the contact area are reduced, and the remaining oxide film The electrical resistance of the conducting portion becomes unstable, and the mechanical holding function of the conductor due to the wedge action decreases.

  Further, the serration is formed by pressing, but as shown by the crimp terminal 171 in FIG. 8, when the recess 173 is pressed, the recess 173 is excluded when the recess 173 is pressed by the teeth of the mold. The movement of the metal (the volume of the concave portion 173) causes a force as indicated by an arrow 175, and the angle of the edge portion 177 of the concave portion 173 inevitably becomes larger than 90 °.

  Further, if the conductor locking groove (concave portion) is shallow, the dimensional tolerance is reduced accordingly, and the processing and management costs can be reduced.

In view of this, the present invention forms the edge portion of the conductor locking groove (recessed portion: serration) at a predetermined angle (for example, a right angle), thereby providing high conductivity to the conductor, a mechanical holding function, and an effect of preventing disconnection of the conductor. Is intended to provide a crimp terminal that can be obtained in a balanced manner.

Crimp terminal according to claim 1, the electrical connection between the mating terminals, and the conductor crimping portion crimped the conductor of the wire made of a conductor and an insulating coating, and the tightening of the insulating coating pressurized insulating coating crimping section wherein the conductor crimping portion includes a conductor mounting portion for mounting said conductor is formed integrally with the insulating coating crimping section and the electric connection portion, provided in said conductor mounting portion, bent and a crimping piece for holding the conductor, the conductor mounting portion, provided in a direction crossing the axis of the conductor, the conductor and engaging by an external force caulking the caulking pieces to the conductor A crimp terminal having a plurality of conductor locking grooves to be stopped, wherein at least a part of the conductor locking groove is separated from the conductor mounting portion to the conductor locking groove of the conductor mounting portion. by forming the convex portion to the corresponding rear side, each conductor engaging Wherein the portion of the edges are substantially perpendicular form.

  The invention according to claim 2 is the crimp terminal according to claim 1, wherein the angle of the edge portion is substantially equal by making the depth of the conductor locking groove equal to the height of the convex portion on the back side. It is characterized by being formed at a right angle.

The invention of claim 3 is the crimp terminal according to claim 1 or claim 2, wherein the recess formed by pressing is subjected to a plurality of times of pressing to form the conductor locking groove and the back side. A convex portion is formed.

  The crimp terminal according to claim 1 presses the conductor locking groove, unlike the conventional example, by forming the conductor locking groove (recess: serration) and the convex portion at a position corresponding to the back side thereof. At that time, by moving the volume of the meat (metal) moving from the conductor locking groove toward the convex portion, the angle of the edge portion of the conductor locking groove is prevented from becoming an obtuse angle. A predetermined angle is given to the edge portion of each conductor locking groove.

  In addition, in order to form a convex portion on the back side of the conductor locking groove, a recess corresponding to the convex portion is provided in the lower mold (anvil) used for press working, but the edge of the conductor locking groove The angle of the portion becomes larger than the right angle (90 °) as the concave portion of the lower mold is shallow (the back side convex portion is lowered), and becomes closer to the right angle as it is deeper.

  Therefore, by adjusting the depth of the concave portion of the lower mold, if necessary, the angle of the edge portion can be appropriately increased from 90 ° to improve the conductor disconnection prevention effect. It is also possible to increase the continuity and the mechanical holding force by setting the angle of the edge portion to 90 ° or appropriately smaller than 90 °.

In this way, the crimp terminal of the present invention can maintain the appropriate amount of biting into the conductor of the conductor locking groove (edge portion) by managing the angle of the edge portion within a range centered on a right angle. The electrical resistance of the part is stabilized, the electrical conductivity is improved, the mechanical holding force is improved, and the conductor is prevented from being disconnected.
In addition, since at least a part of the conductor locking groove is cut off from the conductor mounting portion, the movement of the meat (metal) from the conductor locking groove that occurs during pressing is blocked at the cutting portion. The effect of stabilizing, the effect of stabilizing electrical resistance, the electrical conductivity and the mechanical holding force are further improved.

  The crimp terminal according to claim 2 is a case where the angle of the edge portion is made substantially perpendicular by equalizing the depth (d) of the conductor locking groove and the height (h) of the back side convex portion. By making the angle substantially perpendicular, the edge portion R becomes small, and an effect equivalent to that of the structure of claim 1 can be obtained.

Crimp terminal according to claim 3, the same effect as the configuration according to claim 1 or claim 2 is obtained.

  Further, in this configuration in which the conductor locking groove and the back-side convex portion are gradually processed by performing a plurality of times of press processing on the pre-pressed concave portion, the crimp terminal is prevented from being damaged during the processing. At the same time, the dimensional accuracy is improved by gradually processing, and it becomes easier to form the edge part at a predetermined angle (for example, a right angle), so that the obtuse angle prevention effect of the edge part and the stabilization effect of the electric resistance are achieved. In addition to improving the electrical conductivity and the mechanical holding force, the yield of the crimp terminals is improved along with the prevention of breakage during processing, and the cost is reduced accordingly.

It is a perspective view which shows the crimp terminal 1 of Example 1, and the electric wire 9 (conductor 5) crimped | bonded to this. It is sectional drawing which shows the AA cross section and conductor 5 of FIG. It is sectional drawing which shows a mode that the conductor 5 is crimped | bonded by the crimp terminal 1 (conductor mounting part 15). It is sectional drawing which shows a mode that the recessed part 55 and the convex part 57 are pressed by the metal mold | die 53 at the crimp terminal 51 of Example 2. FIG. It is sectional drawing which shows a mode that the recessed part 105 and the convex part 107 are primary-press processed by the metal mold | die 103 to the crimp terminal 101 of Example 3. FIG. It is sectional drawing which shows a mode that the recessed part 111 and the convex part 113 are secondary-press-processed by the metal mold | die 109 to the recessed part 105 primary-press-processed. 10 is a cross-sectional view showing a crimp terminal 151 of Patent Document 1. FIG. It is sectional drawing which shows the conventional crimp terminal 171.

  Hereinafter, embodiments of the crimp terminal according to the present invention will be described.

  The crimp terminal 1 (Embodiment 1 of the present invention) will be described with reference to FIGS.

[Features of crimp terminal 1]
The crimp terminal 1 includes an electrical connection portion 3 with a mating terminal, a conductor crimping portion 11 for crimping the conductor 5 of the electric wire 9 composed of the conductor 5 and the insulation coating 7, and an insulation coating crimping for crimping the insulation coating 7. The conductor caulking part 11 is formed integrally with the electrical connecting part 3 and the insulating coating caulking part 13 and is provided on the conductor placing part 15. And a pair of crimping pieces 17 and 17 that are bent and hold the conductor 5. The conductor mounting portion 15 is formed in a direction (right angle) intersecting with the axis of the conductor 5. , 17 is a crimp terminal 1 provided with a plurality of recesses 19 (conductor locking grooves: serrations) for receiving and holding the conductor 5 by clamping the conductor 5 to the conductor 5,
The convex portion 21 is formed on the back side corresponding to the concave portion 19 of the conductor placement portion 15, and the depth (d) of the concave portion 19 and the height (h) of the rear side convex portion 21 are made equal to each other, thereby forming the edge portion of the concave portion 19. The angle 23 is formed at a substantially right angle (90 °).

  In addition, the recess 19 is formed shallow enough to improve the effect of biting into the conductor 5 due to the edge portion 23 having a substantially right angle.

  The insulation coating crimp part 13 is provided with a pair of crimping pieces 25 and 25 such that a pair of crimping pieces 17 and 17 are provided on the conductor crimping part 11 (conductor placing part 15). The wire 9 is crimped to the crimp terminal 1 by crimping the crimping pieces 25, 25 to the insulating coating 7 and crimping the crimping pieces 17, 17 to the conductor 5.

As in FIG. 1, are three recesses 19 and the projections 21 each of the conductor mounting portion 15 is formed, these convex portions corresponding to the recess 19 in the upper mold for press working is provided, The lower mold is provided with a recess corresponding to the back projection 21. A predetermined width and depth (d) are selected for the concave portion 19, and a predetermined width and height (h) are selected for the convex portion 21. As described above, the depth (d) of the concave portion 19 is selected. And the height (h) of the convex part 21 is made equal.

  Further, the concave portion 19 and the convex portion 21 are pressed at the same time, and by processing the convex portion 21 on the back side of the concave portion 19, the force for moving the metal (meat) from the concave portion 19 works as the force for forming the convex portion 21. Since the force as shown by the arrow 175 in FIG. 8 that makes the angle of the edge portion 23 an obtuse angle is not generated, the angle θ between the wall surface 29 of the recess 19 and the upper surface 31 of the conductor locking groove 5 is almost equal to FIG. Thus, the angle of both edge portions 23 of the recess 19 is formed at a substantially right angle.

When the conductor 9 is crimped and connected to the crimp terminal 1 and the conductor 5 is pressed against the recess 19 by the crimping pieces 17 and 17 as described above, the edge portion 23 bites into the conductor 5 as shown in FIG. As a result, the oxide film of the conductor 5 is destroyed (cleaned), the contact area between the conductor 5 and the crimp terminal 1 (conductor crimped portion 11) is increased, and the conductivity (electrical performance) is improved. The mechanical holding force of the conductor 5 (the electric wire 9) is improved by the wedge action (locking action) in which the 23 bites into the conductor 5.

[Effect of crimp terminal 1]
The crimp terminal 1 has the following effects.

  By forming the convex portion 21 on the back side of the concave portion 19, the angle of the edge portion 23 is made substantially right angle, and the amount of biting into the conductor 5 is appropriately managed. Therefore, the electrical resistance of the conductive portion is stabilized and the conductivity is improved. The mechanical holding force is improved and the conductor 5 is prevented from being disconnected.

  In addition, the recess 19 can be formed shallow enough to improve the biting effect on the conductor 5 by making the angle of the edge portion 23 substantially right angle and reducing the R (FIG. 3) of the edge portion 23, so Tolerances are relaxed and processing and management costs are reduced.

  FIG. 4 shows a crimp terminal 51 (Embodiment 2 of the present invention). Hereinafter, the same functional parts and functional members as those in the first embodiment will be described with the same reference numerals, and redundant explanations will be omitted.

  In the crimp terminal 51, the concave portion 55 (conductor placement portion: serration) is processed by pressing using the upper die 53, and the convex portion 57 is processed at a corresponding position on the back side thereof, whereby the edge portion of the concave portion 55 is processed. While the angle of 59 is substantially a right angle (90 °), (at least a part) of each recess 55 is separated from the conductor placement portion 15 by the separation portion 61.

  The crimp terminal 51 configured as described above can obtain the same effect as the crimp terminal 1 (Example 1), and can be separated from the recess 55 by separating the recess 55 and the conductor placing part 15 during the pressing process. Since the movement of the meat (metal) is blocked by the separating portion 61, the obtuse angle preventing effect of the edge portion 59, the effect of stabilizing the electric resistance, the continuity and the mechanical holding force are further improved.

  5 and 6 show a crimp terminal 101 (Embodiment 3 of the present invention). Hereinafter, the same functional parts and functional members as those in the first embodiment will be described with the same reference numerals, and redundant explanations will be omitted.

  In the crimp terminal 101, as shown in FIG. 5, the concave portion 105 (conductor placement portion: serration) and the convex portion 107 on the back side are processed by primary press processing using the upper mold 103, and thereafter, as shown in FIG. The concave portion 105 is subjected to secondary press processing using the upper die 109 to process the two concave portions 111 and the convex portions 113 respectively.

  The crimp terminal 101 configured as described above is subjected to press processing in two (multiple) times, so that damage during processing is prevented and the dimensional accuracy of the concave portion 111 and the convex portion 113 is improved. Since it becomes easier to form the edge portion 115 at a substantially right angle (predetermined angle), the effect of preventing the obtuse angle of the edge portion 115, the effect of stabilizing the electric resistance, the conductivity and the mechanical holding force are obtained. In addition to the improvement, the yield of the crimp terminal 101 is improved by preventing breakage during processing, and the cost is reduced.

DESCRIPTION OF SYMBOLS 1 Crimp terminal 3 Electrical connection part with the other party terminal 5 Conductor 7 Insulation coating 9 Electric wire 11 Conductor caulking part 13 Insulation coating caulking part 15 Conductor mounting part 17 Caulking piece 19 Recess (Conductor locking groove: Serration)
21 Convex part corresponding to the back side of the concave part 23 23 Edge part of the concave part 19 Crimp terminal 55 Concave part (conductor locking groove: serration)
57 Convex part corresponding to the back side of the concave part 59 59 Edge part of the concave part 55 61 Detaching part 101 Crimp terminal 105 Concave part 111 for the primary processing concave part 113 for the secondary processing 113 Convex part corresponding to the back side of the concave part 111

Claims (3)

Comprising an electrical connection portion of a mating terminal, and the conductor crimping portion crimped the conductor of the wire made of a conductor and an insulating coating, and the tightening of the insulating coating pressurized insulating coating crimping section,
The conductor crimping portion includes a conductor mounting portion for mounting said conductor is formed integrally with the insulating coating crimping section and the electric connection portion, provided in said conductor mounting portion, bent by the conductor A caulking piece for holding
To the conductor mounting portion, provided in a direction crossing the axis of the conductor, a plurality of conductor engaging groove the conductor and engaging by an external force caulking the caulking pieces to the conductor is formed crimped A terminal,
By at least a portion of the conductor locking groove to form the back side convex portion corresponding to the conductor engaging groove of said conductor mounting portion by separating from said conductor mounting portion, wherein each conductor engaging groove The edge of is formed at a substantially right angle ,
Crimp terminal characterized by that. The crimp terminal according to claim 1,
By making the depth of the conductor locking groove equal to the height of the convex portion on the back side, the angle of the edge portion is formed substantially at right angles .
Crimp terminal characterized by that. The crimp terminal according to claim 1 or 2, wherein
The conductor locking groove and the convex part on the back side are formed by subjecting the concave part formed by pressing to a plurality of times of pressing ,
Crimp pin, characterized in that.

Images