JP2010262915A - Crimp terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crimp terminal capable of stabilizing electric connection resistance at a low level while an extension in a conductor-axis direction is kept as it is (product dimensions after crimping are kept as it is) and stabilizing mechanical connection force at a high level. <P>SOLUTION: New level differences H2 are arranged on each of internal bottom sections of serrations 17 formed mutually parallel along a designated direction of a conductor at least a center range in the longitudinal direction of the conductor on an internal surface of a conductor crimp section 12 of a crimp terminal since a plurality of recessed sections 17a and a plurality of projected sections 17b are arranged in an extension direction of the serration. Thus, deep depth sections and shallow depth sections are arranged being distributed on an internal surface of the conductor crimp section. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a crimp terminal suitable for use in connection with an electric wire.

  As this type of crimp terminal, those shown in FIGS. 13 and 14 are known (see, for example, Patent Documents 1 and 2).

  As shown in FIG. 13, this crimp terminal 1 is formed by twisting together an electrical contact portion 2 having a through hole 2 a through which a fastening means such as a bolt (not shown) can pass and a plurality of strands 6 a of an electric wire 5. And a crimping portion 3 having a substantially U-shaped cross section connected to a conductor (core wire) 6 by crimping. On the inner surface 3 a of the crimp portion 3, a plurality of concave groove-shaped serrations 4 extending in a direction orthogonal to the length direction of the conductor 6 are formed.

  As shown in FIG. 14, when the conductor 6 of the electric wire 5 is crimped to the crimping portion 3 of the crimping terminal 1 by crimping, the strand 6 a of the conductor 6 slides while being rubbed against the concave serration 4. Thus, the surface of the wire 6a of the conductor 6 and the crimping portion 3 of the crimp terminal 1 are brought into close contact with each other, and electrical connection is achieved.

  FIG. 15A is a development view of the crimp terminal, and FIG. 15B is a cross-sectional view taken along line BB in FIG. 15A. As shown in FIG. 15, in the conventional crimp terminal 1, only a few serrations 4 having a constant depth are formed.

Japanese Patent Laying-Open No. 2007-173215 (FIG. 1) Japanese Patent Laying-Open No. 2003-249284 (FIG. 7)

  By the way, when crimping and crimping a conductor of an electric wire to a crimping portion of a crimping terminal, actually, the crimping is often too strong or weakly crimped, and it is difficult to adjust the crimping. For example, if the crimping force is too weak (compression ratio is too low), the electrical connection resistance between the crimp terminal and the electric wire tends to be high and unstable.

  Also, if the crimping is too strong (the compression ratio is too high), the conductor will be damaged significantly (especially if the conductor is a twisted bundle of thin wires), and the mechanical connection force between the crimping terminal and the wire (Fixing force) is low and tends to vary, and the conductor and the crimp terminal extend too much in the axial direction, resulting in a large change in dimensions.

  In consideration of the above circumstances, the present invention can stabilize the electrical connection resistance at a low level while maintaining the extension in the conductor axis direction as it is (the product dimensions after the crimping are the same), and can stabilize the mechanical connection force at a high level. An object of the present invention is to provide a crimp terminal that can be used.

  In order to solve the above-mentioned problem, the invention of claim 1 has a conductor crimping part that is crimped and connected to the end of the conductor of the electric wire, and the conductor crimping part extends on both sides of the bottom plate and the bottom plate. And a pair of conductor crimping pieces that are crimped so as to wrap the conductor disposed on the inner surface of the bottom plate, and are formed in a substantially U-shaped cross section, and are parallel to the inner surface of the conductor crimping portion along a predetermined direction. In the crimp terminal in which a plurality of concave groove-shaped serrations extending in the direction are formed, deep serrations and shallow serrations are distributed on the inner surface of the conductor crimping portion as the serrations. It is characterized by that.

  A second aspect of the present invention is the crimp terminal according to the first aspect, wherein the serration is provided along a direction orthogonal to the length direction of the conductor.

  A third aspect of the present invention is the crimp terminal according to the first aspect, wherein the serration is provided along a length direction of the conductor.

  The invention of claim 4 is the crimp terminal according to any one of claims 1 to 3, wherein the deep serration and the shallow serration are provided next to each other. It is characterized by that.

  The invention according to claim 5 has a conductor crimping portion that is crimped and connected to the end of the conductor of the electric wire, and the conductor crimping portion extends on both sides of the bottom plate and the bottom plate and is arranged on the inner surface of the bottom plate. A plurality of concave groove-shaped wires formed in a substantially U-shaped cross section with a pair of conductor crimping pieces that are crimped so as to wrap the conductor, and extending in parallel along a predetermined direction on the inner surface of the conductor crimping portion In the crimp terminal in which the serration is formed, at the inner bottom portion of the serration formed at least in the central region of the inner surface of the conductor crimp portion in the length direction of the conductor, a deep portion and a shallow portion are formed. It is characterized by being distributed.

  A sixth aspect of the present invention is the crimp terminal according to the fifth aspect, wherein the deep portion and the shallow portion are constituted by a plurality of concave portions and convex portions arranged in a direction in which the serration extends. A step is provided at the inner bottom of the serration by the concave and convex portions.

  The invention according to claim 7 is the crimp terminal according to claim 6, wherein the recesses and projections are arranged at regular intervals in each serration in which the recesses and projections are formed on the inner bottom portion. The positions of the concave portions and the convex portions of the serrations adjacent to each other in the longitudinal direction of the conductor are alternately arranged so that the deep portions and the shallow portions are provided in a dispersed manner.

  The invention of claim 8 has a conductor crimping portion that is crimped and connected to the end of the conductor of the electric wire, and the conductor crimping portion extends on both sides of the bottom plate and the bottom plate and is arranged on the inner surface of the bottom plate. A plurality of concave groove-shaped wires formed in a substantially U-shaped cross section with a pair of conductor crimping pieces that are crimped so as to wrap the conductor, and extending in parallel along a predetermined direction on the inner surface of the conductor crimping portion In the crimp terminal in which the serration is formed, a step is formed by a concave portion and a convex portion having different depths on the inner bottom portion of the serration.

  The invention of claim 9 has a conductor crimping portion that is crimped and connected to the end of the conductor of the electric wire, and the conductor crimping portion extends on both sides of the bottom plate and the bottom plate and is arranged on the inner surface of the bottom plate. A plurality of concave groove-shaped wires formed in a substantially U-shaped cross section with a pair of conductor crimping pieces that are crimped so as to wrap the conductor, and extending in parallel along a predetermined direction on the inner surface of the conductor crimping portion In the crimp terminal in which the serration is formed, the inner surface of the conductor crimping portion is provided with a recess that is recessed by one step with a reduced thickness, leaving the peripheral portion of the inner surface, and the inner surface of the recess has the plurality of A serration is formed.

  According to the first aspect of the present invention, since the serrations having a deep depth and the serrations having a small depth are distributed on the inner surface of the conductor crimping portion, damage (ie, in other words, compression applied to the conductor during crimping) Rate) can be dispersed. Therefore, the mechanical connection strength can be stably increased. In addition, since the overall compression ratio can be increased while reducing the damage applied to the conductor, the area of contact between the crimp terminal and the conductor can be increased, and the electrical connection resistance can be stabilized low. Furthermore, since deformation due to crimping can be dispersed, the extension of the crimp terminal and the electric wire in the axial direction of the conductor can be suppressed, and the dimensional change after crimping can be suppressed to a small level.

  According to the invention of Claim 2 and Claim 3, the same effect as that of Claim 1 can be obtained.

  According to the invention of claim 4, since the deep serration and the shallow serration are provided next to each other, it is possible to enhance the effect of dispersing the damage applied to the conductor during crimping.

  According to the invention of claim 5, a deep portion and a shallow portion are distributed and provided on the inner bottom portion of the serration formed at least in the central region in the conductor length direction of the inner surface of the conductor crimping portion. Therefore, damage (that is, in other words, compressibility) applied to the conductor during crimping can be dispersed. Therefore, the mechanical connection strength can be stably increased. In addition, since the overall compression ratio can be increased while reducing the damage applied to the conductor, the area of contact between the crimp terminal and the conductor can be increased, and the electrical connection resistance can be stabilized low. Furthermore, since deformation due to crimping can be dispersed, the extension of the crimp terminal and the electric wire in the axial direction of the conductor can be suppressed, and the dimensional change after crimping can be suppressed to a small level.

  According to the invention of claim 6, since a new step is formed in the direction in which the serration extends, it is possible to promote the elongation of the conductor in the direction (radial direction of the conductor) perpendicular to the longitudinal direction of the conductor during crimping. That is, the conductor is gripped at a deep portion (concave portion), and the conductor is stretched at a shallow portion (upper surface of the convex portion), thereby increasing the total amount of elongation. In addition, by increasing the amount of catch (edge due to the step) of the conductor when the conductor and the crimp terminal are slid relative to each other by crimping, the contact area between the crimp terminal and the conductor can be increased, resulting in a low resistance value. A stable connection becomes possible.

  According to the invention of claim 7, by disposing the concave and convex portions of the serrations adjacent to each other in the longitudinal direction of the conductor alternately, the deep and shallow portions of the inner bottom portion of the serration are dispersed. As a result, the manner of dispersion is uniform, and the conductor crimping portion can be uniformly adhered over a wide area on the inner surface.

  According to the eighth aspect of the present invention, since a new step is formed inside the serration, the elongation of the conductor can be promoted. That is, the conductor is gripped at a deep portion (concave portion), and the conductor is stretched at a shallow portion (upper surface of the convex portion), thereby increasing the total amount of elongation. In addition, by increasing the amount of catch (edge due to the step) of the conductor when the conductor and the crimp terminal are slid relative to each other by crimping, the contact area between the crimp terminal and the conductor can be increased, resulting in a low resistance value. A stable connection becomes possible. In addition, this makes it possible to avoid strong pressure bonding, thereby reducing damage to the conductor due to compression and making the mechanical connection strength high and stable. Furthermore, since deformation due to crimping can be dispersed in the radial direction of the conductor, the extension of the crimping terminal and the electric wire in the axial direction of the conductor can be suppressed, and the dimensional change after the crimping can be suppressed to be small.

  According to the ninth aspect of the present invention, the presence of the recess having a large area on the inner surface of the conductor crimping portion can reduce the amount of compression, reduce the damage to the conductor, and can be mechanically connected. The strength can be increased stably. Also, since the steps are arranged along the longitudinal direction of the conductor by a plurality of serrations provided on the inner bottom surface of the recess, the conductor is gripped at the deep part of the step, and the conductor is elongated at the shallow part of the step. As a result, the total elongation increases. In addition, by increasing the number of catches (edges due to steps) when the conductor and the crimp terminal slide relative to each other due to crimping, the contact area between the crimp terminal and the conductor can be increased, resulting in a low resistance value. A stable connection becomes possible. Furthermore, since deformation due to crimping can be dispersed, the extension of the crimp terminal and the electric wire in the axial direction of the conductor can be suppressed, and the dimensional change after crimping can be suppressed to a small level.

It is a side view which shows the state which crimped | bonded the crimp terminal of 1st Embodiment of this invention to the electric wire. (A) is a top view of the crimp terminal, and (b) is a front view. (A) is a development view of a conductor crimping portion of the crimp terminal, (b) is a sectional view taken along line BB in (a), (c) is a sectional view taken along line CC in (a), (d). FIG. 4 is an enlarged view of a D part in (b). It is a figure which shows the principal part structure of the crimp terminal of 2nd Embodiment of this invention, (a) is an expanded view of the conductor crimping part of the crimp terminal, (b) is BB arrow sectional drawing of (a), (C) is a CC arrow sectional view of (a), (d) is a DD arrow sectional view of (a), (e) is an E section enlarged view of (b) and (c). . It is a figure which shows the principal part structure of the crimp terminal of another aspect of 2nd Embodiment of this invention, (a) is an expanded view of the conductor crimping part of the same crimp terminal, (b) is a BB arrow view of (a). Cross-sectional view, (c) is a cross-sectional view taken along the line CC of (a), (d) is a cross-sectional view taken along the line D-D of (a), and (e) is an enlarged view of the E part of (b) and (c). FIG. It is a cross-sectional view of the crimp part of the crimp terminal of the first embodiment and the second embodiment. It is sectional drawing along the axial direction of the conductor of the crimping | compression-bonding part. It is a partial expanded sectional view along the direction orthogonal to the axial direction of the conductor of the crimping | compression-bonding part. (A) is a top view of the crimp terminal of 3rd Embodiment of this invention, (b) is a front view. It is an expanded view of the conductor crimping part of the crimp terminal. It is AA arrow sectional drawing of FIG. It is BB arrow sectional drawing of FIG. It is a perspective view which shows the conventional crimp terminal. It is a cross-sectional view of the part which crimped the electric wire of the crimp terminal. (A) is a development view of the crimp terminal, and (b) is a cross-sectional view taken along the line BB in (a).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a side view showing the configuration of the crimp terminal of the first embodiment, FIG. 2 (a) is a plan view of the crimp terminal, (b) is a front view, and FIG. 3 (a) is a conductor crimp part of the crimp terminal. (B) is a cross-sectional view taken along the line B-B of (a), (c) is a cross-sectional view taken along the line C-C of (a), and (d) is an enlarged view of the D part of (b). .

  As shown in FIGS. 1 and 2, the crimp terminal 10 is manufactured by being subjected to tin plating after being entirely pressed with copper or a copper alloy. Immediately after that, there is a conductor crimping portion 12 to be crimped and connected to the end of the conductor Wa of the electric wire W, and a covering crimping portion 15 for crimping a portion with the coating Wb of the electric wire W on the further rear side. is doing.

  The electric wire W is composed of a conductor (core wire) Wa formed by twisting a plurality of strands Wc and an insulating coating Wb covering the conductor Wa, and the crimp terminal 10 is an end of the conductor Wa of the electric wire W. (Front end) is connected with its front-rear direction aligned with the longitudinal direction of the conductor Wa of the electric wire W.

  The conductor crimping portion 12 includes a pair of left and right conductors that are crimped so as to wrap around the bottom plate 13 that is continuous from the electrical connection portion 11 and the conductor Wa that is provided on the left and right sides of the bottom plate 13 and is disposed on the inner surface 13a of the bottom plate 13. The fastening pieces 14 and 14 are formed in a substantially U-shaped cross section.

  In the range from the inner surface of the conductor crimping portion 12, that is, the inner surface 13 a of the bottom plate 13 to the inner surface 14 a of the conductor crimping piece 14, a direction orthogonal to the length direction of the conductor Wa (the radial direction or circumferential direction of the conductor) Therefore, in the following description, the plurality of concave groove-like serrations 16 and 17 extending in parallel to each other in the longitudinal direction of the conductor Wa (front-rear direction of the crimp terminal) are parallel to each other. Is formed.

  In this case, the concave portions 17a and the convex portions 17b having different depths extend from the inner bottom portions of the plurality of serrations 17 in the central region excluding the two serrations 16 at both ends in the longitudinal direction of the conductor. Steps H1 are arranged between the upper surface of the convex portion 17b and the inner surface of the conductor crimping portion 12 by providing serrations 17 having such irregularities, which are alternately arranged at equal intervals along the direction. And a step H2 is secured between the upper surface of the convex portion 17b and the bottom surface of the concave portion 17a.

  The serrations 16 disposed at both ends in the longitudinal direction of the conductor on the inner surface of the conductor crimping portion 12 are serrations having a constant depth without a step.

  Next, the operation will be described.

  On the bottom plate 13 of the crimping portion 12 of the crimping terminal 10 configured in this way, the conductor Wa exposed by peeling the end of the electric wire W is placed, and as shown in FIG. When the pieces 14 and 14 are crimped so as to enclose the conductor Wa and are crimped, the inner surface of the conductor crimping portion 12 (only the inner surface 13a of the bottom plate 13 is shown in the figure) by the pressing force applied from the outside as shown in FIG. The conductor Wa strongly presses, and the crimp terminal 10 and the conductor Wa extend in the longitudinal direction of the conductor Wa.

  Further, as shown in FIG. 8, the serration 17 in the central region has a new step H <b> 2 inside thereof, so that the extension of the conductor in the direction in which the serration 17 extends (the radial direction of the conductor Wa). That is, the elongation of the conductor Wa (elementary wire Wc) in the radial direction Y of the conductor Wa can be promoted. That is, the conductor Wa is gripped in the deep portion (the concave portion 17a), and the conductor Wa is stretched in the shallow portion (the upper surface of the convex portion 17b), thereby increasing the total amount of elongation.

  In addition, since the hooking of the conductor Wa (edge EG due to the step H2) when the conductor Wa and the crimping terminal 10 slide relative to each other in the radial direction Y due to crimping, the area where the crimping terminal 10 and the conductor Wa are in close contact with each other increases. As a result, stable connection with a low resistance value is possible.

  In addition, this makes it possible to avoid strong pressure bonding, thereby reducing damage to the conductor Wa due to compression and making it possible to stabilize mechanical connection strength at a high level. Furthermore, since deformation due to crimping can be dispersed in the radial direction Y of the conductor Wa, the elongation of the crimp terminal 10 and the electric wire W in the axial direction of the conductor Wa can be suppressed, and the dimensional change after crimping can be suppressed to a small extent. Can do.

  Moreover, in this embodiment, since the serrations 16 having a constant depth are provided at both ends in the longitudinal direction of the conductor Wa on the inner surface of the conductor crimping portion 12, the front and rear ends of the conductor Wa are formed by these serrations 16. It is possible to restrain, and the elongation of the conductor Wa between the serrations 16 at the front and rear ends in the lateral direction (radial direction of the conductor) can be further promoted.

  As shown in FIG. 8, the distance between the concave portion 17a and the convex portion 17b (particularly the length of the concave portion 17a) is slightly smaller than the diameter of the strand Wc. Since it becomes easy to catch, it is preferable.

  4A and 4B are diagrams showing the main configuration of the crimp terminal according to the second embodiment of the present invention. FIG. 4A is a development view of the conductor crimp part of the crimp terminal, and FIG. 4B is FIG. 4C is a cross-sectional view taken along the line C-C in FIG. 4A, FIG. 4D is a cross-sectional view taken along the line D-D in FIG. 4 (e) is an enlarged view of a portion E in FIGS. 4 (b) and 4 (c).

  In the crimp terminal 10a of the second embodiment, a deep portion and a shallow portion are formed on the inner bottom portion of the serration 17 formed at least in the central region of the conductor on the inner surface of the conductor crimp portion 12. They are distributed. Specifically, a deep portion and a shallow portion are constituted by a plurality of concave portions 17a and convex portions 17b arranged in the direction in which the serration 17 extends, and the concave portions 17a and the convex portions 17b. A step H2 is provided on the inner bottom of the serration 17. Note that, in the same manner as in the first embodiment described above, a plurality of concave groove-like serrations 16 and 17 are formed along a direction orthogonal to the length direction of the conductor Wa.

  In this case, it is important that the concave portions 17a and the convex portions 17b are arranged at regular intervals in each serration 17, and the positions of the concave portions 17a and the convex portions 17b of the serrations 17 adjacent to each other in the longitudinal direction of the conductor are alternated. It is that they are lined up. That is, the positions of the concave portions 17a and the convex portions 17b of the serrations 17 of the S rows and the serrations 17 of the N rows which are alternately arranged are staggered, and the concave portions 17a and the convex portions 17b are dispersed in a substantially staggered manner in the entire surface. As a result, a deep portion (concave portion 17a) and a shallow portion (convex portion 17b) exist in a dispersed manner. Since the other points are the same as in the first embodiment, description thereof is omitted.

  According to the crimp terminal 10a of the second embodiment, a deep portion and a shallow portion are provided at the inner bottom portion of the serration 17 formed at least in the central region of the inner surface of the conductor crimp portion 12 in the conductor length direction. Since these are provided in a distributed manner, damage (that is, in other words, compression rate) applied to the conductor Wa at the time of crimping can be dispersed. Therefore, the mechanical connection strength can be stably increased. Moreover, since the whole compression rate can be raised while reducing the damage applied to the conductor Wa, the adhesiveness of the crimp terminal 10a and the electric wire W can be improved, and electrical connection resistance can be stabilized low. Furthermore, since deformation due to crimping can be dispersed, the extension of the crimp terminal 10a and the electric wire in the axial direction of the conductor can be suppressed, and the dimensional change after crimping can be suppressed to a small value.

  Further, the effect obtained by forming a new step H2 in the direction in which the serration 17 extends is the same as that of the first embodiment. At the time of crimping, the conductor Wa in the direction orthogonal to the longitudinal direction of the conductor Wa (the radial direction of the conductor Wa). Can be promoted. That is, the conductor Wa is gripped in the deep portion (the concave portion 17a), and the conductor Wa is stretched in the shallow portion (the upper surface of the convex portion 17b), thereby increasing the total amount of elongation. In addition, by increasing the number of hooks of the conductor (edge EG due to a step) when the conductor Wa and the crimp terminal 10a slide relative to each other by crimping, the area where the crimp terminal 10a and the conductor Wa are in close contact with each other can be increased. As a result, a stable connection with a low resistance value is possible.

  In the present embodiment, the positions of the concave portions 17a and the convex portions 17b of the serrations 17 that are adjacent to each other in the longitudinal direction of the conductor Wa are alternately arranged, so that the deep portion and the shallow depth of the inner bottom portion of the serration 17 are arranged. Since the locations are dispersed, the manner of dispersion is uniform, and the conductor crimping portion 12 can be uniformly adhered over a wide area.

  In the second embodiment of FIG. 4, the serrations 17 in which the concave portions 17 a and the convex portions 17 b are formed are provided only in the central region, but similar irregularities are also formed in the serrations 16 at the front and rear ends of the conductor crimping portion 12. The portions 17a and 17b may be provided so that deep portions (concave portions 17a) and shallow portions (17b) are distributed over a wider range.

  Moreover, in the said embodiment, although the deep part and the shallow part were disperse | distributed to the inner surface of the conductor crimping | compression-bonding part by providing the recessed part 17a and the convex part 17b inside the serration 17, a deep serration and a shallow depth are carried out. Serrations may be distributed. For example, deep serrations and shallow serrations may be arranged alternately next to each other.

  Even in this case, damage (that is, in other words, compression rate) applied to the conductor during crimping can be dispersed. Therefore, the mechanical connection strength can be stably increased. In addition, since the overall compression ratio can be increased while reducing the damage applied to the conductor, the contact area between the crimp terminal 10a and the conductor of the electric wire can be increased, and the electrical connection resistance can be stabilized low. it can. Furthermore, since deformation due to crimping can be dispersed, the extension of the crimp terminal 10a and the electric wire in the axial direction of the conductor can be suppressed, and the dimensional change after crimping can be suppressed to a small value.

  In particular, when a deep serration and a shallow serration are provided next to each other, the effect of dispersing damage applied to the conductor during crimping can be enhanced.

  Next, another aspect of the second embodiment of the present invention will be described.

  FIG. 5 is a diagram showing a configuration of a main part of a crimp terminal according to another aspect of the second embodiment of the present invention. FIG. 5 (a) is a development view of a conductor crimp part of the crimp terminal, and FIG. 5A is a cross-sectional view taken along the line B-B in FIG. 5A, FIG. 5C is a cross-sectional view taken along the line C-C in FIG. 5A, and FIG. 5D is a cross-sectional view taken along the line D-D in FIG. FIG. 5 and FIG. 5E are enlarged views of a portion E in FIGS. 5B and 5C.

  The main difference between the present embodiment and the configuration of the second embodiment described above is that, in the second embodiment, a plurality of concave grooves 17 are arranged in a direction perpendicular to the length direction of the conductor Wa. In this embodiment, a plurality of concave serrations 17 are formed along the length direction of the conductor Wa. In the second embodiment described above, the serrations 16 having a constant depth are provided at both ends in the longitudinal direction of the conductor Wa on the inner surface of the conductor crimping portion 12, but in this embodiment, the depth without a step is provided. There is no fixed serration.

  That is, in the crimp terminal 10b of this aspect, the recesses 17a and the protrusions 17b are arranged at regular intervals in each serration 17 by setting the serrations in the S rows and the serrations in the N rows alternately. In addition, the positions of the concave portions 17a and the convex portions 17b of the serrations 17 adjacent to each other in the radial direction of the conductor are alternately arranged, and a deep portion and a shallow portion are disposed in the entire inner surface of the conductor crimping portion 12. Are distributed. Since the other points are the same as in the second embodiment, description thereof is omitted.

  According to the crimp terminal 10b of this aspect, since the deeper portions and the shallower portions are dispersedly provided on the inner bottom portion of the serration 17 formed over the entire inner surface of the conductor crimping portion 12, crimping is performed. It is possible to disperse the damage (that is, the compression rate) that is sometimes applied to the conductor Wa. Therefore, the mechanical connection strength can be stably increased. In addition, since the overall compression ratio can be increased while reducing damage applied to the conductor Wa, the adhesion between the crimp terminal 10b and the electric wire W can be increased, and the electrical connection resistance can be stabilized low. Furthermore, since deformation due to crimping can be dispersed, the extension of the crimp terminal 10b and the electric wire in the axial direction of the conductor can be suppressed, and the dimensional change after crimping can be suppressed to a small level.

  Further, the effect obtained by forming a new step H2 in the direction in which the serration 17 extends is the same as that of the first embodiment. At the time of crimping, the conductor Wa in the direction orthogonal to the longitudinal direction of the conductor Wa (the radial direction of the conductor Wa). Can be promoted. That is, the conductor Wa is gripped in the deep portion (the concave portion 17a), and the conductor Wa is stretched in the shallow portion (the upper surface of the convex portion 17b), thereby increasing the total amount of elongation. In addition, by increasing the number of hooks of the conductor (edge EG due to a step) when the conductor Wa and the crimp terminal 10b slide relative to each other by crimping, the area where the crimp terminal 10b and the conductor Wa are in close contact with each other can be increased. As a result, a stable connection with a low resistance value is possible.

  Further, in the present embodiment, the positions of the concave portions 17a and the convex portions 17b of the serrations 17 adjacent to each other in the radial direction of the conductor Wa are alternately arranged so that the deep portion of the inner bottom portion of the serrations 17 is shallow. Since the locations are dispersed, the manner of dispersion is uniform, and the conductor crimping portion 12 can be uniformly adhered over a wide area.

  In this embodiment of FIG. 5, the serrations 17 in which the concave portions 17 a and the convex portions 17 b are formed are provided over the entire inner surface of the conductor crimping portion 12, but the diameter of the conductor Wa is provided at the longitudinal front and rear ends of each serration 17. It is good also as a structure which provides the serration equivalent to the serration 16 of 1st Embodiment formed along a direction.

  Moreover, in the said embodiment, although the deep part and the shallow part were disperse | distributed to the inner surface of the conductor crimping | compression-bonding part by providing the recessed part 17a and the convex part 17b inside the serration 17, a deep serration and a shallow depth are carried out. The serrations may be provided in the same manner as in the second embodiment.

  In this aspect, the concave portions 17a and the convex portions 17b are arranged at regular intervals in each serration 17, and the positions of the concave portions 17a and the convex portions 17b of the serrations 17 adjacent in the radial direction of the conductor are alternately arranged. The S rows and the N rows of serrations are alternately arranged, but the same serrations may be arranged in parallel as in the first embodiment.

  Next, a third embodiment of the present invention will be described.

  9A is a plan view of a crimp terminal according to a third embodiment of the present invention, FIG. 9B is a front view, FIG. 10 is a development view of a conductor crimp portion of the crimp terminal, and FIG. -A arrow sectional drawing, FIG. 12 is BB arrow sectional drawing of FIG.

  In this crimp terminal 20, a concave portion 26 is provided on the inner surface of the conductor crimping portion 12, leaving a peripheral edge portion of the inner surface, and being recessed one step by a reduced thickness, and a conductor (not shown) is formed on the inner bottom surface of the concave portion 26. ) Are formed at equal intervals in the longitudinal direction of the conductor. As a result, two steps H3 and H4 are formed in the longitudinal direction of the conductor.

  According to the crimp terminal 20 configured in this manner, the presence of the recess 26 having a large area on the inner surface of the conductor crimping portion 12 can reduce the amount of compression and reduce damage to the conductor. The mechanical connection strength can be increased stably. Further, since the steps H3 and H4 are arranged along the longitudinal direction of the conductor by the plurality of serrations 27 provided on the inner bottom surface of the recess 26, the conductor is gripped at the deep step portion and the conductor at the shallow step portion. When the elongation occurs, the total amount of elongation increases. In addition, since the conductor can be hooked (edge due to a step) when the conductor and the crimp terminal slide relative to each other by crimping, the area where the crimp terminal and the conductor are in close contact can be increased, and a stable connection can be achieved with a low resistance value. Become. Furthermore, since deformation due to crimping can be dispersed, the elongation of the crimp terminal 20 and the electric wire in the axial direction of the conductor can be suppressed, and the dimensional change after crimping can be suppressed to a small level.

10, 20 Crimp terminal 12 Conductor crimping portion 13 Bottom plate 13a Inner surface 14 Conductor crimping piece 16 Serration 17 Serration 17a Concave portion 17b Convex portion W Electric wire Wa Conductor Wc Wire

Claims (9)

A conductor crimping portion connected by crimping to the end of the conductor of the electric wire, the conductor crimping portion extending on both sides of the bottom plate and the bottom plate so as to wrap the conductor disposed on the inner surface of the bottom plate A crimp formed by a pair of crimped conductors to be crimped and having a substantially U-shaped cross section, and on the inner surface of the conductor crimping portion, a plurality of concave groove-shaped serrations extending in parallel along a predetermined direction are formed. At the terminal,
As the serration, a crimp terminal having deep serrations and shallow serrations distributed on the inner surface of the conductor crimping portion. The crimp terminal according to claim 1,
The crimp terminal, wherein the serration is provided along a direction orthogonal to the length direction of the conductor. The crimp terminal according to claim 1,
The crimp terminal, wherein the serration is provided along a length direction of the conductor. The crimp terminal according to any one of claims 1 to 3,
The crimp terminal, wherein the deep serration and the shallow serration are provided next to each other. A conductor crimping portion connected by crimping to the end of the conductor of the electric wire, the conductor crimping portion extending on both sides of the bottom plate and the bottom plate so as to wrap the conductor disposed on the inner surface of the bottom plate A crimp formed by a pair of crimped conductors to be crimped and having a substantially U-shaped cross section, and on the inner surface of the conductor crimping portion, a plurality of concave groove-shaped serrations extending in parallel along a predetermined direction are formed. At the terminal,
In the inner bottom portion of the serration formed at least in the central region of the inner surface of the conductor crimping portion in the length direction of the conductor, a deep portion and a shallow portion are provided in a dispersed manner. Crimp terminal. The crimp terminal according to claim 5,
The deep part and the shallow part are composed of a plurality of recesses and projections arranged in the direction in which the serration extends, and a step is provided on the inner bottom of the serration by these recesses and projections. Crimp terminal characterized by The crimp terminal according to claim 6,
The concave and convex portions are arranged at regular intervals on each serration in which the concave and convex portions are formed on the inner bottom, and the positions of the concave and convex portions of the serrations adjacent to each other in the longitudinal direction of the conductor are alternately arranged. The crimp terminal is characterized in that the deep part and the shallow part are provided in a distributed manner. A conductor crimping portion connected by crimping to the end of the conductor of the electric wire, the conductor crimping portion extending on both sides of the bottom plate and the bottom plate so as to wrap the conductor disposed on the inner surface of the bottom plate A crimp formed by a pair of crimped conductors to be crimped and having a substantially U-shaped cross section, and on the inner surface of the conductor crimping portion, a plurality of concave groove-shaped serrations extending in parallel along a predetermined direction are formed. At the terminal,
A crimp terminal having a step formed by a concave portion and a convex portion having different depths at an inner bottom portion of the serration. A conductor crimping portion connected by crimping to the end of the conductor of the electric wire, the conductor crimping portion extending on both sides of the bottom plate and the bottom plate so as to wrap the conductor disposed on the inner surface of the bottom plate A crimp formed by a pair of crimped conductors to be crimped and having a substantially U-shaped cross section, and on the inner surface of the conductor crimping portion, a plurality of concave groove-shaped serrations extending in parallel along a predetermined direction are formed. At the terminal,
The inner surface of the conductor crimping portion is provided with a recess that is recessed by one step with a reduced thickness, leaving the peripheral edge of the inner surface, and the plurality of serrations are formed on the inner bottom surface of the recess. Crimp terminal to be used.

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