JP2009152054A - Crimp terminal and connection structure of crimp terminal to coated wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crimp terminal capable of enhancing mechanical connection strength to a coated wire even if a bell mouth is formed at both end part of a conductor crimping part with, for instance, an aluminum wire is used as a coated wire of a connection counterpart, and to provide a connection structure of the connection terminal to the coated wire. <P>SOLUTION: A position on a bottom plate part 11 corresponding to a startup position 21 of the bell mouth 20 at a coated caulking part 14 side is to be a starting point, and a height of the top face of the bottom plate part 11 further rearward is set low, whereby, a step difference h of a size corresponding to a thickness of insulation coating 200 of a coated wire is provided between a bottom plate part 11A of the conductor crimping part 13 and a bottom plate part 11B of the coated caulking part 14. The step difference h is secured, as a slanted part 11C is provided at the bottom plate part 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an open barrel type crimp terminal provided with a U-shaped conductor crimping portion and a covering crimping portion, and a connection structure of the crimp terminal to a covered electric wire.

  FIG. 3 is a diagram for explaining a conventional general open barrel type crimp terminal and its crimping method, and FIG. 4 is a cross-sectional view of a portion where the crimp terminal is crimped to a covered electric wire. In the figure, 110 is a crimp terminal, 100 is a covered electric wire, and 131 and 132 are a lower mold and an upper mold of a crimping jig.

  As shown in FIG. 3, the crimp terminal 110 has a longitudinal direction (hereinafter, this direction is referred to as “front-rear direction”, and a direction orthogonal thereto is described as “left-right direction”) with respect to a counterpart terminal or the like. A conductor crimping portion 113 that includes an electrical connection portion 112 and is crimped to the exposed conductor 100a at the tip of the covered electric wire 100 on the other end side, and a covered crimping portion that is crimped to a portion of the covered electric wire 100 having the insulating coating 100b. 114, and the electrical connection portion 112, the conductor crimping portion 113, and the covering crimping portion 114 are configured to include a common bottom plate portion 111.

  The conductor crimping portion 113 is a U-shaped section in which a pair of conductor crimping pieces 113a are erected on both lateral edges of the bottom plate portion 111 continuous from the electrical connecting portion 112, and a crimp terminal is provided on the inner surface thereof. 110 is provided with a plurality of serrations 113b extending in the left-right direction (that is, shallow grooves lined by pressing) 113b. The covering crimping portion 114 is a U-shaped section in which a pair of covering crimping pieces 114a are formed upright on both side edges of the bottom plate portion 111. The conductor crimping portion 113 and the covering crimping portion 114 are Are arranged at an appropriate interval in the front-rear direction.

  In order to crimp the conductor crimping part 113 of the crimping terminal 110 to the exposed conductor 100a at the tip of the covered electric wire 100, the crimping terminal 110 is placed on the mounting surface 131a of the lower mold 131 and the tip of the covered electric wire 100 is The exposed conductor 100 a is inserted between the conductor crimping pieces 113 a of the conductor crimping portion 113 and placed on the bottom plate portion 111. Then, by lowering the upper mold 132, the leading end side of the conductor crimping piece 113a is gradually tilted inward on the guide slope 132a of the upper mold 132, and finally, the central chevron 132b from the guide slope 132a. The conductor crimping piece 113a is rounded so as to be folded back toward the conductor 100a with a curved surface continuous to the conductor 100a, and, as shown in FIG. The conductor crimping piece 113a is crimped so as to wrap the wire. The coated crimping portion 114 is crimped in advance to the portion having the insulating coating 100b of the coated electric wire 100 in the same manner as described above before the crimping of the conductor crimping portion 113.

  When the conductor crimping portion 113 is crimped to the conductor 100a of the covered electric wire 100 by crimping the conductor crimping piece 113a in this way, the conductive metal constituting the crimp terminal 110 and the conductor 100a of the covered electric wire 100 are adhered ( The crimp terminal 110 and the covered electric wire 100 can be strongly electrically and mechanically coupled to each other.

  5 and 6 show a case where reliefs called bell mouths 120 are provided at both front and rear ends of the conductor crimping portion 113 when the crimp terminal 110 is crimped to the conductor 100a of the covered electric wire 100 as described above. . The bell mouth 120 is for preventing the conductor 100a from being scratched at the inner side edge (edge) of the conductor crimping piece 113a, and obliquely outward so as to escape from the surface of the conductor 100a. It has a widening shape.

  In order to form the bell mouth 120, as shown in FIG. 5, the width of the upper mold (crimper) 132 for crimping the conductor crimping piece 113a is made smaller than the width of the conductor crimping piece 113a to Only the central portion of the clamped piece 113a is used as a crimped portion, and non-crimped portions are left at both front and rear end portions of the conductor crimped piece, so that the bell mouth 120 is made at the time of crimping finish. This is because if the entire width of the conductor crimping piece 113a is crimped, the conductor 100a may be damaged by the end inner surface side corner edge of the conductor crimping piece 113a.

Japanese Patent Laid-Open No. 7-135031 (FIG. 8)

  By the way, the bell mouth 120 can be naturally formed by securing a non-caulking portion next to the caulking portion and performing caulking. That is, a large compressive force is actually applied to the conductor 100a inside the crimping portion, but almost no compressive force is applied to the portion of the conductor 100a inside the portion that becomes the bell mouth 120. Further, the compressive force applied to the conductor crimping piece 113a has the same difference between the crimped portion and the non-crimped portion. Therefore, the bell mouth 120 having an inclination angle (that is, a clearance angle) θ (theta) corresponding to the compression deformation of the conductor 100a and the conductor crimping piece 113a can be formed at both ends of the conductor crimping portion 113.

  For example, when it is necessary to crimp a crimp terminal by applying a strong compressive force, such as when crimping a crimp terminal to an aluminum or aluminum alloy conductor of an aluminum wire, the inclination angle θ of the bell mouth 120 is copper It tends to be larger than when it is crimped to an electric wire. Therefore, when a crimp terminal is crimped to an aluminum electric wire, as shown in FIG. 8, when a tensile force is applied to the aluminum electric wire 200, the exposed conductor 200a (that is, an aluminum or aluminum alloy conductor) is strongly compressed. The largest stress is likely to occur at the boundary between the portion held by the force and the portion where the compressive force is hardly applied (the conductor portion inside the bell mouth 120), that is, the starting position 121 of the bell mouth 120, and breaks at that portion. Is likely to occur. In addition, 114 in FIG. 8 is a coating crimping part which crimps the part of the aluminum electric wire 200 with the insulation coating 200b.

  In the case of a copper electric wire, as shown in FIG. 7, the copper conductor 100a itself of the copper electric wire 100 has a larger ductility than the conductor made of aluminum or aluminum alloy (200a). There is a possibility that it can be absorbed, and even when it breaks, it is said that it breaks at a position on the insulating coating 100b side that is shifted from the starting position 121 of the bell mouth 120.

  Further, the reason why the aluminum electric wire 200 is likely to break at the starting position 121 of the bell mouth 120 is that the cross-sectional area and the cross-sectional shape of the exposed conductor 200a greatly change before and after the starting position 121 of the bell mouth 120. In the case of a conductor made of aluminum or aluminum alloy having less ductility than copper, stress is likely to be concentrated at a location where the change in cross section is large.

  In recent years, instead of the copper wires that are commonly used for wiring harnesses inside vehicles such as automobiles, it has become more conductive in light of vehicle weight reduction and fuel efficiency and recyclability. There is a growing demand to use aluminum wires that are inferior in properties (physical properties) such as strength and strength.

  In the case of using an aluminum electric wire, it is necessary to consider that the connection performance of the crimping portion is further increased because aluminum is inferior in mechanical strength and electrical conductivity to copper. However, in the past, since the use of aluminum wires is small, these points have not been sufficiently studied.

  The present invention has been made in view of the above-described circumstances, and the purpose thereof is also applied to, for example, an aluminum electric wire as a covered electric wire to be connected and a bell mouth is formed at both ends of a conductor crimping portion. An object of the present invention is to provide a crimp terminal capable of increasing the mechanical connection strength to an electric wire and a connection structure of the crimp terminal to a covered electric wire.

In order to achieve the above-described object, the crimp terminal according to the present invention is characterized by the following (1) to (3).
(1) A conductor crimping portion having a U-shaped cross section for crimping to the exposed portion of the conductor at the tip end portion of the coated electric wire, and an insulating coating attached to the conductor crimping portion around the conductor. A covered caulking portion having a U-shaped cross section for caulking and fixing a portion of the covered electric wire, and a common bottom plate portion provided continuously to the conductor crimping portion and the covered caulking portion,
The conductor crimping portion extends upward from both side edges of the bottom plate portion and is bent inward so as to wrap the conductor of the covered electric wire to be connected, and the conductor is in close contact with the upper surface of the bottom plate portion; Having a pair of conductor crimping pieces to be crimped,
The covering crimping portion extends upward from both side edges of the bottom plate portion and is bent inward so as to wrap the portion with the insulating coating around the conductor of the covered electric wire to be connected. It has a pair of coated crimping pieces that fasten and fix the coated electric wire,
At the time of caulking the covered electric wire, only the center part in the front-rear direction of the pair of conductor caulking pieces is used as a caulking part that is pressed by a caulking die, and the front and rear ends of the pair of conductor caulking pieces are Then, by caulking with the non-caulking part that is not pressurized by the caulking die, the front and rear end portions of the conductor crimping part after caulking are obliquely spread outward so as to escape from the surface of the conductor. A crimp terminal forming a bell mouth,
The position on the bottom plate portion corresponding to the starting position of the portion serving as the bell mouth on the covering crimping portion side of the conductor crimping portion, and the height of the upper surface of the bottom plate portion closer to the covering crimping portion than that A height difference is set between the bottom plate portion of the conductor crimping portion and the bottom plate portion of the covering crimping portion. It was provided.
(2) In the crimp terminal having the configuration of (1) above,
Starting from the position on the bottom plate portion corresponding to the starting position of the portion serving as the bell mouth on the coated crimped portion side of the conductor crimped portion, to the end surface on the conductor crimped portion side of the coated crimped portion. The bottom plate portion in the range is provided with an inclined portion that inclines downward from the conductor crimping portion toward the covering crimping portion, whereby the portion of the bottom plate portion in the conductor crimping portion and the bottom plate in the covering crimping portion The step is formed between the portions.
(3) In the crimp terminal having the configuration of (1) above,
A step portion is provided in a portion of the bottom plate portion at a position corresponding to a starting position of a portion serving as a bell mouth on the covering crimping portion side of the conductor crimping portion, whereby the portion of the bottom plate portion in the conductor crimping portion and the portion The step is formed between the bottom plate portion of the cover crimping portion.

According to the crimp terminal having the configuration of the above (1), when the crimp terminal is connected to the coated wire by crimping the conductor crimp portion and the coated crimp portion, the portion of the coated wire that is crimped to the coated crimp portion The position of the center can be lowered than before (in other words, the center position of the covered wire portion crimped to the conductor crimping portion is set to be lower than the center position of the covered wire portion crimped to the covering crimping portion. Can be raised). That is, the height of the center of the cross section of the conductor portion crimped by the conductor crimping portion and the height of the center of the covered electric wire crimped by the sheath crimping portion can be made uniform. Therefore, the conductor of the covered electric wire on the side of the covering crimping portion can be released downward from the starting position of the bell mouth on the side of the covering crimping portion of the conductor crimping portion, and thus the conductor to be crimped on the starting position of the bellmouth. Stress can be reduced. Further, since the conductor of the portion of the covered electric wire to be crimped by the sheath crimping portion can be released downward, the inclination angle of the bell mouth can be reduced, and accordingly, the stress on the conductor can be reduced by forming the bell mouth. it can. As a result, the mechanical connection strength can be increased.
According to the crimp terminal having the configuration of the above (2), in order to form a step between the bottom plate portion portion of the conductor crimp portion and the bottom plate portion portion of the covering crimp portion, an inclined portion is provided between them. Therefore, it is possible to obtain a crimp terminal with little change in shape.
According to the crimp terminal having the configuration of the above (3), in order to form a step between the bottom plate portion portion of the conductor crimp portion and the bottom plate portion portion of the cover crimping portion, it corresponds to the starting position of the bell mouth. Since the step portion is provided at the position of the bottom plate portion at the position, it is possible to easily cope with the case where the position of the end portion of the insulating coating extends toward the conductor crimping portion side.

In order to achieve the above-described object, the connection structure of the crimp terminal according to the present invention to the covered electric wire is characterized by the following (4) to (7).
(4) A conductor crimping portion having a U-shaped cross section for crimping to the exposed portion of the conductor at the tip end portion of the coated electric wire, and an insulating coating attached to the conductor crimping portion in parallel. A covered caulking portion having a U-shaped cross section for caulking and fixing a portion of the covered electric wire, and a common bottom plate portion provided continuously to the conductor crimping portion and the covered caulking portion,
The conductor crimping portion extends upward from both side edges of the bottom plate portion and is bent inward so as to wrap the conductor of the covered electric wire to be connected, and the conductor is in close contact with the upper surface of the bottom plate portion; Having a pair of conductor crimping pieces to be crimped,
The covering crimping portion extends upward from both side edges of the bottom plate portion and is bent inward so as to wrap the portion with the insulating coating around the conductor of the covered electric wire to be connected. It has a pair of coated crimping pieces that fasten and fix the coated electric wire,
At the time of caulking the covered electric wire, only the center part in the front-rear direction of the pair of conductor caulking pieces is used as a caulking part that is pressed by a caulking die, and the front and rear ends of the pair of conductor caulking pieces are Then, by caulking with the non-caulking part that is not pressurized by the caulking die, the front and rear end portions of the conductor crimping part after caulking are obliquely spread outward so as to escape from the surface of the conductor. It is a connection structure to the covered electric wire of the crimp terminal where the bell mouth is formed,
Starting from the position on the bottom plate portion corresponding to the starting position of the bell mouth of the conductor crimping portion on the side of the covering crimping portion, the height of the upper surface of the bottom plate portion closer to the covering crimping portion is lower than that Accordingly, a step having a size corresponding to the thickness of the insulation coating of the covered electric wire is provided between the bottom plate portion of the conductor crimping portion and the bottom plate portion of the covering crimping portion. Being.
(5) In the connection structure of the crimp terminal configured as described in (4) above to the covered electric wire,
Starting from the position on the bottom plate portion corresponding to the starting position of the bell mouth on the coated crimped portion side of the conductor crimped portion, the range of the covered crimped portion to the end surface on the conductor crimped portion side The bottom plate portion is provided with an inclined portion that is inclined downward from the conductor crimping portion toward the covering crimping portion, whereby the portion of the bottom plate portion in the conductor crimping portion and the bottom plate portion in the covering crimping portion are provided. The step is formed between the portions.
(6) In the connection structure of the crimp terminal configured as described in (4) above to the covered electric wire,
A step portion is provided in a portion of the bottom plate portion at a position corresponding to a starting position of the bell mouth on the covering crimping portion side of the conductor crimping portion, whereby the bottom plate portion portion in the conductor crimping portion and the covering crimping portion are provided. The step is formed between the bottom plate portion and the fastening portion.
(7) The connection structure of the crimp terminal having the structure according to any one of (4) to (6) to the covered electric wire is as follows:
The covered electric wire is an aluminum electric wire having a conductor made of aluminum or aluminum alloy as the conductor, and a conductor crimping portion of the crimping terminal is crimped to the conductor of the aluminum electric wire.

According to the crimping structure having the configuration of (4) above, when the crimp terminal is connected to the coated wire by crimping the conductor crimped portion and the coated crimped portion, the portion of the coated wire that is crimped to the coated crimped portion The position of the center can be lowered than before (in other words, the center position of the covered wire portion crimped to the conductor crimping portion is set to be lower than the center position of the covered wire portion crimped to the covering crimping portion. Can be raised). That is, the height of the center of the cross section of the conductor portion crimped by the conductor crimping portion and the height of the center of the covered electric wire crimped by the sheath crimping portion can be made uniform. Therefore, the conductor of the covered electric wire on the side of the covering crimping portion can be released downward from the starting position of the bell mouth on the side of the covering crimping portion of the conductor crimping portion, and thus the conductor to be crimped on the starting position of the bellmouth. Stress can be reduced. Further, since the conductor of the portion of the covered electric wire to be crimped by the sheath crimping portion can be released downward, the inclination angle of the bell mouth can be reduced, and accordingly, the stress on the conductor can be reduced by forming the bell mouth. it can. As a result, the mechanical connection strength can be increased.
According to the crimping structure having the above configuration (5), in order to form a step between the bottom plate portion of the conductor crimping portion and the bottom plate portion of the covering crimping portion, an inclined portion is provided between them. Therefore, it is possible to obtain a crimp terminal with little change in shape.
According to the crimping structure having the above configuration (6), in order to form a step between the bottom plate portion of the conductor crimping portion and the bottom plate portion of the covering crimping portion, it corresponds to the starting position of the bell mouth. Since the step portion is provided at the position of the bottom plate portion at the position, it is possible to easily cope with the case where the position of the end portion of the insulating coating extends toward the conductor crimping portion side.
Since the crimping structure having the configuration (7) is applied to an aluminum electric wire having a conductor made of aluminum or aluminum alloy, the conductor is made of aluminum or aluminum alloy which is inferior in strength and ductility compared to a copper conductor. On the other hand, the crimping operation can be performed without imposing an excessive burden.

  According to the crimping terminal of the present invention, similarly, according to the crimping structure of the present invention, even when applied to, for example, an aluminum wire as a connection covered wire, and a bell mouth is formed at both ends of the conductor crimping portion, Connection strength can be increased.

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading through the best mode for carrying out the invention described below with reference to the accompanying drawings.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.

  FIG. 1A is a side view showing the configuration of the crimp terminal of the embodiment, and FIG. 1B is a side view showing a state in which the crimp terminal is connected to an aluminum electric wire 200 (hereinafter also referred to as “covered electric wire”). FIG. 1C is an enlarged cross-sectional view of a portion Ic in FIG.

  As shown in FIGS. 1A and 1B, the crimp terminal 10 is formed by press-molding a conductive metal plate, and is a direction in which the covered electric wire 200 extends, that is, For connecting and electrically connecting the other terminal to one end of the longitudinal direction of the crimp terminal 10 (hereinafter, this direction is referred to as “front-rear direction” and the direction orthogonal thereto is referred to as “left-right direction”). An electric connection portion 12 is provided, and the other end portion is covered with an exposed conductor 200a at the tip end portion of the covered electric wire 200 (that is, a conductor composed of a bundle of a plurality of strands in the form of stranded wires and the outer periphery of the conductor). A conductor crimping portion 13 for crimping to the end portion of the covered electric wire 200 provided with the insulating coating 200b, and a portion of the conductor exposed from the insulating coating 200b. Of conductors and insulation coatings 200 A sheath crimping portion 14 for clamping pressure to the portion having, a. The electrical connection portion 12, the conductor crimping portion 13, and the covering crimping portion 14 are configured to include a common bottom plate portion 11.

  The conductor crimping part 13 is a U-shaped section that is formed upright on both side edges of the bottom plate part 11 so as to extend a pair of conductor crimping pieces 13a upward. A plurality of serrations (that is, shallow grooves lined by pressing) 13b extending in the left-right direction perpendicular to the front-rear direction are provided. Further, the covering crimping portion 14 is a U-shaped section formed so as to stand upright so as to extend a pair of covering crimping pieces 14 a upward on both lateral edges of the bottom plate portion 11. The conductor crimping part 13 and the covering crimping part 14 are arranged side by side with an appropriate interval in the front-rear direction of the crimping terminal 10 (arranged adjacently, more simply).

  When the crimping terminal 10 is crimped to the covered electric wire 200, as shown in FIG. 5, only the center part in the front-rear direction of the pair of conductor crimping pieces 13a of the conductor crimping part 13 is pressurized with a crimping mold. The crimped portion 13a is a crimped portion of the conductor, and the crimped portion 13a after crimping is formed by crimping the front and rear end portions of the pair of conductor crimping pieces 13a leaving a non-crimped portion that is not pressurized with a crimping die. The bell mouth 20 is formed at the front and rear end portions of the outer periphery of the exposed conductor 200a so as to escape from the surface of the exposed conductor 200a.

  And in this crimp terminal 10, the position on the baseplate part 11 corresponding to the starting position 20a of the part 20A which becomes the bell mouth on the covering crimping part 14 side of the conductor crimping part 13 is set as the starting point, and the bottom plate on the rear side of the starting point. The height of the upper surface of the portion 11 is set to be low, whereby the size corresponding to the thickness of the insulation coating 200b of the covered electric wire 200 between the bottom plate portion 11A of the conductor crimping portion 13 and the bottom plate portion 11B of the covering crimping portion 14 is set. Step h is provided.

  In the case of this embodiment, as shown in FIG.1 (c), the position on the baseplate part 11 corresponding to the starting position 20a of the part 20A used as the bellmouth 20 by the side of the covering crimping part 14 of the conductor crimping part 13 is shown. An inclined portion 11C that slopes downward from the front to the rear is provided on the bottom plate portion 11 in the range from the start point to the front end face of the covering crimping piece 14a of the covering crimping portion 14 on the rear side. A step h is secured between the bottom plate portion 11A of the base plate and the bottom plate portion 11B of the cover crimping portion 14.

  To crimp the conductor crimping portion 13 of the crimping terminal 10 to the exposed conductor 200a at the tip of the covered electric wire 200, the crimping terminal 10 is placed on the lower mold 131 (see FIG. 3), and the exposed conductor 200a is crimped to the conductor. It is placed on the bottom plate portion 11 so as to be disposed between the conductor crimping pieces 13 a of the portion 13. Then, by lowering the upper die 132 (see FIG. 3), the leading end side of the conductor crimping piece 13a is tilted inward by the guide slope 132a of the upper die 132. By curving the tip of the conductor crimping piece 13a back to the exposed conductor 200a side with a curved surface that continues to the chevron 132b, the exposed conductor 200a is bitten into the exposed conductor 200a while rubbing the tips together. The conductor crimping piece 13a is crimped so as to be wrapped. About the covering crimping part 14, prior to the crimping of the conductor crimping part 13, it is crimped beforehand to the part which has the insulation coating 200b of the covered electric wire 200 similarly to the above.

  By crimping in this way, a crimping structure as shown in FIGS. 1B and 1C is obtained. That is, the position on the bottom plate part 11 corresponding to the starting position 21 of the bell mouth 20 on the covering caulking part 14 side is set as a starting point, and the height of the upper surface of the rear bottom plate part 11 is set lower than that. Accordingly, a step h having a size corresponding to the thickness of the insulating coating 200b of the covered electric wire 200 is ensured between the bottom plate portion 11A of the conductor crimping portion 13 and the bottom plate portion 11B of the covering crimping portion 14.

  Therefore, the position of the center of the portion of the covered electric wire 200 to be crimped to the covering crimping portion 14 can be lowered as compared with the conventional case (in other words, the position of the center of the portion of the covered electric wire 200 to be crimped to the conductor crimping portion 13). Can be raised from the position of the center of the portion of the covered electric wire 200 to be crimped to the sheath crimping portion 14). That is, the height of the center of the cross section of the exposed conductor 200a portion crimped by the conductor crimping portion 13 and the height of the center of the portion of the covered electric wire 200 crimped to the sheath crimping portion 14 can be made uniform. As a result, the exposed conductor 200a of the covered electric wire 200 on the coated crimping portion 14 side can be released downward from the starting position 21 of the bellmouth 20 on the coated crimping portion 14 side of the conductor crimping portion 13, and the bellmouth 20 is correspondingly lost. The stress on the exposed conductor 200a to be crimped at the starting position 21 can be reduced. Moreover, since the exposed conductor 200a of the portion of the covered electric wire 200 to be crimped to the sheath crimping portion 14 can be released downward, the inclination angle of the bell mouth 20 can be reduced, and the exposed conductor 200a is formed by forming the bell mouth 20 accordingly. Can be reduced. As a result, the mechanical connection strength can be increased.

  In particular, the conductor (200a) of the covered electric wire 200 is made of aluminum or aluminum alloy, but it places an excessive burden on the conductor made of aluminum or aluminum alloy that is inferior in strength and ductility compared to a copper conductor. In addition, the crimping operation can be performed and the connection strength can be increased. As a specific example of the aluminum alloy, an alloy of aluminum and iron can be given. When the said aluminum alloy is employ | adopted, it is easy to extend compared with the conductor made from aluminum, and intensity | strength (especially tensile strength) can be increased.

  Moreover, in the case of this embodiment, in order to form the level | step difference h between 11 A of bottom plate parts of the conductor crimping part 13, and the bottom plate part 11B of the covering crimping part 14, 11 C of inclination parts are provided among them. , Extreme changes in shape can be reduced.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, as shown in FIG. 2, a step portion 11D is provided in the portion of the bottom plate portion 11 at a position corresponding to the starting position 20a of the portion that becomes the bell mouth 20 on the covering crimping portion 14 side of the conductor crimping portion 13, thereby The step h may be secured between the bottom plate portion 11A of the conductor crimping portion 13 and the bottom plate portion 11B of the covering crimping portion 14.

  As described above, when the step 11D secures the step h between the bottom plate portion 11A of the conductor crimping portion 13 and the bottom plate portion 11B of the covering crimping portion 14, the position of the front end portion of the insulating coating 200b is the conductor crimping portion. Even when it extends to the 13th side, it can be easily handled.

(A) is a perspective view which shows the structure of the crimp terminal of embodiment, (b) is a side view which connected the crimp terminal of (a) to the aluminum electric wire, and (c) is an enlarged view of Ic part of (b). It is sectional drawing. It is sectional drawing corresponding to FIG.1 (c) in other embodiment of this invention. It is explanatory drawing of the crimping method of a general crimp terminal and a covered electric wire. It is sectional drawing of a crimping | compression-bonding part. It is a side view for explanation of a method of caulking when forming a bell mouth. It is a sectional side view of the crimping part of the terminal which formed the bell mouth. It is sectional drawing which shows a model in case a copper electric wire fractures | ruptures. It is sectional drawing which shows a model in case an aluminum electric wire fractures | ruptures.

Explanation of symbols

10: Crimping terminal 11 (11A, 11B): Bottom plate portion 11C: Inclined portion 11D: Stepped portion h: Stepped portion 13: Conductor crimping portion 13a: Conductor crimping piece 14: Covered crimping portion 14a: Covered crimping piece 20: Bell Mouse 20A: Bell mouth 20a, 21: Bell mouth starting position 200: Aluminum wire (covered wire)
200a: conductor 200b: insulation coating

Claims (7)

A conductor crimping portion having a U-shaped cross section for crimping to the exposed portion of the conductor at the tip of the coated electric wire, and the covered electric wire provided with an insulating coating around the conductor, arranged side by side with the conductor crimping portion A crimping portion having a U-shaped cross-section for fixing and crimping the portion, and a common bottom plate portion provided continuously to the conductor crimping portion and the coating crimping portion,
The conductor crimping portion extends upward from both side edges of the bottom plate portion and is bent inward so as to wrap the conductor of the covered electric wire to be connected, and the conductor is in close contact with the upper surface of the bottom plate portion; Having a pair of conductor crimping pieces to be crimped,
The covering crimping portion extends upward from both side edges of the bottom plate portion and is bent inward so as to wrap the portion with the insulating coating around the conductor of the covered electric wire to be connected. It has a pair of coated crimping pieces that fasten and fix the coated electric wire,
At the time of caulking the covered electric wire, only the center part in the front-rear direction of the pair of conductor caulking pieces is used as a caulking part that is pressed by a caulking die, and the front and rear ends of the pair of conductor caulking pieces are Then, by caulking with the non-caulking part that is not pressurized by the caulking die, the front and rear end portions of the conductor crimping part after caulking are obliquely spread outward so as to escape from the surface of the conductor. A crimp terminal forming a bell mouth,
The position on the bottom plate portion corresponding to the starting position of the portion serving as the bell mouth on the covering crimping portion side of the conductor crimping portion, and the height of the upper surface of the bottom plate portion closer to the covering crimping portion than that A height difference is set between the bottom plate portion of the conductor crimping portion and the bottom plate portion of the covering crimping portion. A crimp terminal characterized by being provided.   Starting from the position on the bottom plate portion corresponding to the starting position of the portion serving as the bell mouth on the coated crimped portion side of the conductor crimped portion, to the end surface on the conductor crimped portion side of the coated crimped portion. The bottom plate portion in the range is provided with an inclined portion that inclines downward from the conductor crimping portion toward the covering crimping portion, whereby the portion of the bottom plate portion in the conductor crimping portion and the bottom plate in the covering crimping portion The crimp terminal according to claim 1, wherein the step is formed between the portion and the portion.   A step portion is provided in a portion of the bottom plate portion at a position corresponding to a starting position of a portion serving as a bell mouth on the covering crimping portion side of the conductor crimping portion, whereby the portion of the bottom plate portion in the conductor crimping portion and the portion The crimp terminal according to claim 1, wherein the step is formed between the bottom plate portion of the cover crimp portion. A conductor crimping portion having a U-shaped cross section for crimping to the exposed portion of the conductor at the tip of the coated electric wire, and the covered electric wire provided with an insulating coating around the conductor, arranged side by side with the conductor crimping portion A crimping portion having a U-shaped cross-section for fixing and crimping the portion, and a common bottom plate portion provided continuously to the conductor crimping portion and the coating crimping portion,
The conductor crimping portion extends upward from both side edges of the bottom plate portion and is bent inward so as to wrap the conductor of the covered electric wire to be connected, and the conductor is in close contact with the upper surface of the bottom plate portion; Having a pair of conductor crimping pieces to be crimped,
The covering crimping portion extends upward from both side edges of the bottom plate portion and is bent inward so as to wrap the portion with the insulating coating around the conductor of the covered electric wire to be connected. It has a pair of coated crimping pieces that fasten and fix the coated electric wire,
At the time of caulking the covered electric wire, only the center part in the front-rear direction of the pair of conductor caulking pieces is used as a caulking part that is pressed by a caulking die, and the front and rear ends of the pair of conductor caulking pieces are Then, by caulking with the non-caulking part that is not pressurized by the caulking die, the front and rear end portions of the conductor crimping part after caulking are obliquely spread outward so as to escape from the surface of the conductor. It is a connection structure to the covered electric wire of the crimp terminal where the bell mouth is formed,
Starting from the position on the bottom plate portion corresponding to the starting position of the bell mouth of the conductor crimping portion on the side of the covering crimping portion, the height of the upper surface of the bottom plate portion closer to the covering crimping portion is lower than that Accordingly, a step having a size corresponding to the thickness of the insulation coating of the covered electric wire is provided between the bottom plate portion of the conductor crimping portion and the bottom plate portion of the covering crimping portion. A structure for connecting a crimp terminal to a covered electric wire, characterized in that:   Starting from the position on the bottom plate portion corresponding to the starting position of the bell mouth on the coated crimped portion side of the conductor crimped portion, the range of the covered crimped portion to the end surface on the conductor crimped portion side The bottom plate portion is provided with an inclined portion that is inclined downward from the conductor crimping portion toward the covering crimping portion, whereby the portion of the bottom plate portion in the conductor crimping portion and the bottom plate portion in the covering crimping portion are provided. The said level | step difference is formed between the parts, The connection structure to the covered electric wire of the crimp terminal described in Claim 4 characterized by the above-mentioned.   A step portion is provided in a portion of the bottom plate portion at a position corresponding to a starting position of the bell mouth on the covering crimping portion side of the conductor crimping portion, whereby the bottom plate portion portion in the conductor crimping portion and the covering crimping portion are provided. The connecting structure for connecting a crimp terminal to a covered electric wire according to claim 4, wherein the step is formed between the bottom plate portion of the tightening portion.   5. The covered electric wire is an aluminum electric wire having a conductor made of aluminum or an aluminum alloy as the conductor, and a conductor crimping portion of the crimp terminal is crimped to the conductor of the aluminum electric wire. A connection structure of the crimp terminal according to any one of claims 6 to a covered electric wire.

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