JP2010182512A - Crimp style 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 the 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 slit portion 21 is formed around the conductor locking grooves 19 and the edge portion 23 of the conductor locking grooves 19 is made into a right angle. <P>COPYRIGHT: (C)2010,JPO&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 “terminal fittings”.

  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. 6 shows a crimp terminal 101 of Patent Document 1, and the serration is composed of a plurality of recesses 103 and 105. When the conductor is pressed against the recesses 103 and 105 during caulking, the edge portions 107 and 109 are formed. By biting into the conductor, the oxide film of the conductor is destroyed (cleaned), the contact area between the conductor and the terminal fitting is increased, and the electrical conductivity (electrical performance) is improved. The mechanical holding force of the conductor (electric wire) is improved by the wedge action that bites into the conductor.

  Further, in the case of the crimp terminal 101, the serration is constituted by making the angle θ1 of the outer edge 109 larger than the angle θ2 of the inner edge 107 in the concave portions 105 on both ends of the serration. By providing the recesses with various depths, the electrical 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. 6, the crimp terminal 101 has an inverted trapezoidal shape in which the recesses 103 and 105 become wider toward the opening side. As a result, the angles θ2 and θ1 of the edge portions 107 and 109 are both larger than 90 °. It has become. If the angle of the edge portion is larger than 90 °, it will be difficult to penetrate into the conductor. Therefore, the cleaning effect of the oxide film and the effect of improving the conductivity due to the increase in the contact area are reduced, and the electric resistance of the conductive portion is reduced by the remaining oxide film. It becomes stable, and the mechanical holding function of the conductor due to the wedge action is lowered.

  Further, the serration is formed by pressing, but as shown by the crimp terminal 121 in FIG. 7, when the recess 123 is pressed, the recess 123 is excluded when the recess 123 is pressed by the teeth of the mold. The movement of the metal (the meat corresponding to the volume of the concave portion 123) generates a force as indicated by an arrow 125, and the angle of the edge portion 127 of the concave portion 123 is necessarily larger than 90 °.

  Furthermore, if the conductor locking groove (concave portion) is shallow, the dimensional tolerance is relaxed, 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 a conductor disconnection preventing effect. The purpose is to provide terminal fittings that can be obtained in a balanced manner.

  The crimp terminal of claim 1 includes an electrical connection portion with a mating terminal, a conductor crimping portion for crimping a conductor of an electric wire composed of a conductor and an insulation coating, and an insulation coating crimping portion for crimping the insulation coating. The conductor caulking part is formed integrally with the electrical connection part and the insulating coating caulking part, and a conductor placing part on which the conductor is placed, and a crimping piece which is provided on the conductor placing part and is bent to hold the conductor A plurality of conductor locking grooves that are provided in the conductor mounting portion in a direction intersecting with the conductor axis and that are locked to the conductor by receiving an external force that crimps the crimping piece to the conductor. The crimp terminal has a cut portion formed around the conductor locking groove, and a predetermined angle is given to the edge portion of each conductor locking groove by forming the cut portion. And

  According to a second aspect of the present invention, in the crimp terminal according to the first aspect, an angle of the edge portion is substantially a right angle.

  The invention of claim 3 is the crimp terminal according to claim 1 or claim 2, wherein the conductor locking groove is an improvement in the effect of biting into the conductor by obtaining a predetermined edge portion angle. It is characterized by being formed shallow.

  In the crimp terminal according to the first aspect, a cut portion (for example, a wedge-shaped cut portion) having an arbitrary shape and depth is formed around the conductor locking groove (recessed portion: serration) during press working. When machining the stop groove and the cut portion in a single process, the force to remove the volume of meat (metal) from the conductor locking groove and the force to remove the volume of metal (metal) from the cut portion When the notch portion is processed in the process after the conductor locking groove is processed, the volume moved from the conductor locking groove is given. A predetermined angle is given to the edge part of the conductor latching groove | channel by moving the meat (metal) for the volume from the notch part, and pushing it back.

  In addition, it is possible to select the shape and depth of the cut portion, and if this is done, if necessary, the angle of the edge portion is appropriately increased from 90 ° to improve the conductor disconnection prevention effect. In addition, when the cut portion is processed after the conductor locking groove is processed, the angle of the edge portion can be made appropriately smaller than 90 ° to further improve the electrical conductivity and the mechanical holding force.

  As described above, the crimp terminal of the present invention appropriately controls the amount of biting into the conductor of the conductor locking groove (edge portion) by providing a cut portion around the conductor locking groove and selecting the angle of the edge portion. In addition, the electrical resistance of the conductive portion can be stabilized, the electrical conductivity can be improved, the mechanical holding force can be improved, and the effect of preventing the conductor from being disconnected can be improved.

  The crimp terminal according to the second aspect is the case where the angle of the edge portion is substantially a right angle, and the same effect as the structure of the first aspect can be obtained.

  The crimp terminal of claim 3 can obtain the same effect as the structure of claim 1 or claim 2.

  Also, since the conductor locking groove can be formed shallower by the amount of improvement in the effect of biting into the conductor by adjusting the angle appropriately, the dimensional tolerance of the conductor locking groove is reduced accordingly, and processing and management are performed. Cost is reduced.

It is a perspective view which shows the crimp terminal 1 and the electric wire 9 (conductor 5) crimped | bonded to this. It is a principal part enlarged view of FIG. It is AA sectional drawing of FIG. 3 is a cross-sectional view showing a conductor placement portion 15 and a conductor 5 of the crimp terminal 1. FIG. FIG. 4 is a cross-sectional view showing a state in which a concave portion 19 and a cut portion 21 are pressed with a metal mold 27 on a conductor placement portion 15 of a crimp terminal 1. 10 is a cross-sectional view showing a crimp terminal 101 of Patent Document 1. FIG. It is sectional drawing which shows the conventional crimp terminal 121. FIG.

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

  The crimp terminal 1 (one embodiment of the present invention) will be described with reference to FIGS. Hereinafter, members and the like that are not given reference numerals are not shown.

[Features of crimp terminal 1]
The crimp terminal 1 includes an electrical connection portion 3 with a counterpart 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 portion for crimping the insulation coating 7. The conductor crimping portion 11 is formed integrally with the electrical connecting portion 3 and the insulation coating crimping portion 13 and is provided on the conductor placement portion 15 and the conductor placement portion 15. A pair of caulking pieces 17 and 17 which are bent and hold the conductor 5, and are formed on the conductor mounting portion 15 in a direction (right angle) intersecting the axis of the conductor 5, The crimp terminal 1 is provided with a plurality of recesses 19 (conductor locking grooves: serrations) that receive and hold the conductor 17 with an external force that crimps the conductors 17 on the conductors 5, on both sides (peripheries) of the recesses 19. A wedge-shaped cut portion 21 is formed, and each cut portion 21 is formed to form each concave portion. Predetermined angle at both edges 23 of 19 (perpendicular: 90 °) is given.

  Further, the recess 19 is formed shallower by an amount corresponding to an improvement in the effect of biting into the conductor 5 due to the angle of the edge portion 23 being 90 °.

  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 shown in FIG. 3, the conductor placing portion 15 is formed with three concave portions 19 and four wedge-shaped cut portions 21, and as shown in FIG. The mounting unit 15 is pressed and processed. The upper die 27 is provided with a convex portion 29 having a rectangular cross section and a convex portion 31 having a triangular cross section corresponding to the concave portion 19 and the wedge-shaped cut portion 21, respectively.

  In addition, a predetermined width and depth are selected for each recess 19, and a predetermined angle and depth are selected for each notch 21. The crimp terminal 1 is an example in which the concave portion 19 and the cut portion 21 are simultaneously pressed by the upper die 27. In this case, a force for removing metal (meat) from the concave portion 19 (for example, a force indicated by an arrow 125 in FIG. 7). And the force 33 (FIG. 5) for removing metal (meat) from the notch 21 is balanced to form both edge portions 23 of each recess 19 at 90 °.

  The cut portion 21 may be pressed in a subsequent process of the concave portion 19, and in this case, the volume of metal (meat) moved from the concave portion 19 is moved by the cut portion 21 (the volume of metal (meat)). By pushing back with meat), the edge portion 23 is formed at 90 °.

  As described above, the electric wire 9 is crimped and connected 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. 17, when the conductor 5 is pressed against the recess 19, the edge portion 23 bites into the conductor 5 to destroy (clean) the oxide film of the conductor 5, and the conductor 5 and the terminal fitting 1 (conductor caulking portion 11). The contact area with the conductor 5 is increased to improve electrical conductivity (electrical performance), and further, the mechanical holding force of the conductor 5 (the electric wire 9) is improved by the wedge action (locking action) in which the edge portion 23 bites into the conductor 5. .

  Further, unlike the conventional example in which the angles of the edge portions 107 and 109 are larger than 90 °, the crimp terminal 1 in which the angle of the edge portion 23 is adjusted to 90 ° and the amount of biting of the edge portion 23 is appropriately increased is The conductivity due to the biting of the portion 23 and the mechanical holding force of the electric wire 9 are improved, and the breakage of the conductor 5 due to the excessive biting of the edge portion 23 is prevented.

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

  The wedge-shaped cut portions 21 are provided on both sides of the concave portion 19, and the edge portion 23 of the concave portion 19 is formed by balancing the force for removing metal (meat) from the concave portion 19 and the force 33 for removing metal (meat) from the cut portion 21. By setting the angle to 90 ° and appropriately adjusting the amount of biting of the edge portion 23 into the conductor 5, the electrical conductivity and the mechanical holding force of the electric wire 9 are improved, and the conductor 5 is prevented from being disconnected.

  Further, by selecting the angle of the edge portion 23, it is possible to achieve both the improvement effect of the conductivity and the mechanical holding force and the effect of preventing the disconnection of the conductor 5 at a high level.

  Further, since the concave portion 19 is formed shallow enough to improve the effect of biting into the conductor 5 by appropriately adjusting the angle of the edge portion 23, the dimensional tolerance of the concave portion 19 is reduced accordingly, and the processing and management costs are reduced. Has been 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 Recessed part (conductor latching groove: serration)
21 Wedge-shaped notch 23 Edge of recess 19

Claims (3)

An electrical connection portion with a mating terminal, a conductor crimping portion for crimping a conductor of a wire made of a conductor and an insulation coating, and an insulation coating crimping portion for crimping the insulation coating
The conductor caulking part is formed integrally with the electrical connection part and the insulating coating caulking part, and is provided on the conductor placing part and the conductor placing part, and is crimped to hold the conductor by being bent. And having a piece,
A crimp terminal provided in the conductor mounting portion in a direction intersecting with the conductor axis, and having a plurality of conductor locking grooves that receive the external force for crimping the crimping piece to the conductor and latch the conductor. And
A crimp terminal, wherein a cut portion is formed around the conductor locking groove, and a predetermined angle is given to an edge portion of each conductor locking groove by forming the cut portion. The crimp terminal according to claim 1,
The crimp terminal, wherein an angle of the edge portion is substantially a right angle. The crimp terminal according to claim 1 or 2, wherein
The crimp terminal is characterized in that the conductor locking groove is formed shallow enough to improve the effect of biting into the conductor by obtaining a predetermined edge angle.

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