JP2009245700A - Crimp terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crimp terminal capable of improving electrical connectivity and mechanical connectivity. <P>SOLUTION: A wire barrel part 10 for crimping core wires 102 of a covered electric wire 100 is constituted of a barrel bottom part 11 on which the core wires 102 are placed, and wire barrel pieces 12 extending from both sides in the width direction Y of the barrel bottom part 11. The barrel bottom part 11 has a plurality of serrations 20 which are formed in groove shape in the width direction Y and arranged with a prescribed spacing in the length direction X. On nearer the base end side than the serrations 20, a core wire holding part 10b is formed which holds a conductor part with the barrel bottom part 11 and the wire barrel piece 12. The core wire holding part 10b has a conductor holding force improvement structure for improving a conductor holding force to hold the core wires 102. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to, for example, a crimp terminal that is crimped to a conductor portion of a covered electric wire and attached to the tip of the covered electric wire.

Conventionally, as a terminal fitting to be attached to the tip of a covered electric wire, a crimp terminal provided with a crimping portion for crimping a conductor part with a sheath removed has been often used.
Specifically, the crimp terminal is composed of a terminal connection portion disposed on the distal end side in the longitudinal direction and a crimp portion disposed on the proximal end side in the longitudinal direction for crimping the conductor portion of the covered electric wire, and the crimp portion is The crimping bottom surface on which the conductor portion is placed, and a crimping piece called a wire barrel extending from both sides in the widthwise direction of the crimping bottom surface, and the crimping bottom surface is in the form of a groove in the width direction called serration. A plurality of grooves are provided at predetermined intervals in the longitudinal direction.

  The crimping terminal configured as described above can electrically and mechanically connect the terminal connecting portion and the conductor portion by crimping the conductor portion placed on the crimping bottom surface with a crimping piece.

  Even when the crimping portion is formed in a cylindrical shape and the crimping bottom surface is provided on the cylindrical inner surface, the conductor portion is inserted into the cylindrical shape and placed on the crimping bottom surface. The terminal connection portion and the conductor can also be electrically and mechanically connected by crushing and crimping from the outside.

  Further, by providing serrations on the crimping bottom surface, a part of the crimped conductor portion is deformed according to the groove shape of the serration, and the crimped conductor portion can be prevented from being pulled out from the crimping portion. That is, mechanical connectivity can be improved by serration.

  In addition, by providing serrations on the crimping bottom surface, the conductor part crimped to the crimping bottom surface by the crimping piece bites into the concave locking groove and deforms, thus increasing the contact area and reducing electrical resistance. Can be realized.

  However, in such a connection between the crimp terminal and the conductor part, if the crimping by the crimping piece is weak, the electrical resistance in the electrical connection with the conductor part is increased. The deformation load due to the deformation increases, the strength of the conductor portion decreases, and there is a concern that the conductor will be broken at a load less than that required for use.

  Therefore, among the serrations arranged in the longitudinal direction, crimping to the extent that reliable electrical connectivity can be ensured by reducing the depth of the serration groove on the most proximal side where a lot of pulling load acts during use Even when crimping with a piece, a crimping method has been proposed that suppresses deformation load due to deformation that bites into the serration on the base end side and does not break with a load less than the strength necessary for use ( Patent Document 1).

By using the crimping method of Patent Document 1 above, it is possible to ensure good electrical connectivity and mechanical connectivity that is not likely to break with a load less than the strength required for use, but the conductor portion in the serration on the proximal side The deformation of the conductor was small, and it was not possible to sufficiently prevent the conductor portion that was crimped from being pulled out from the crimping portion.
Japanese Patent Laid-Open No. 2003-31274

  An object of this invention is to provide the crimp terminal which can improve electrical connectivity and mechanical connectivity.

  The present invention comprises a crimping portion for crimping a conductor portion of a covered electric wire, comprising a crimping bottom surface on which the conductor portion is placed and a crimping piece extending from both sides in the width direction of the crimping bottom surface. A width direction locking groove formed in the shape of a groove, and on the base end side of the locking groove, a base end side conductor holding portion that holds the conductor portion by the crimping bottom surface and the crimping piece is formed; It is a crimp terminal provided with a conductor holding force improving structure for improving a conductor holding force for holding the conductor portion in the base end side conductor holding portion.

  As an aspect of the present invention, in the crimping bottom surface in which the locking groove is disposed in the distal end side portion which is the distal end side from the center in the longitudinal direction, the conductor holding force improving structure is a proximal end side which is the proximal end side from the center Can be composed of parts.

  Further, as an aspect of the present invention, the amount of compression of the conductor portion compressed by the crimping by the base end side conductor holding portion of the structure for improving the conductor holding force is more than the amount of compression by the other crimping bottom surface and the crimping piece. It can be constituted by a compression amount reducing means for reducing.

Further, as an aspect of the present invention, the compression amount reducing means can be constituted by a thin crimping piece having a small thickness in the base end side conductor holding portion.
Further, as an aspect of the present invention, the compression amount reducing means can be configured by a taper crimping piece whose thickness gradually decreases toward the base end in the base end side conductor holding portion.

  Further, as an aspect of the present invention, when the compression amount reducing means is crimped to the crimping piece with a crimping jig, the inner surface side start position is near the distal end of the proximal end side conductor holding portion, The base end side bell mouth formed on the crimping piece can be used.

Further, as an aspect of the present invention, the side surface in the width direction that is the end portion in the width direction of the locking groove can be formed as an inclined side surface that is inclined upward in the width direction.
Moreover, as an aspect of the present invention, a plurality of the locking grooves can be arranged at predetermined intervals in the longitudinal direction of the crimping bottom surface.

  The covered electric wire is a covered electric wire in which a conductor portion in which a plurality of wires are made of pure copper, copper alloy, aluminum, or aluminum alloy is covered with an insulating covering, for example, a wire made of annealed copper wire A very thin covered electric wire having a conductor portion formed.

The crimping part includes a crimping bottom surface and crimping pieces called barrel pieces arranged on both sides in the width direction of the crimping bottom surface. This includes a wire barrel of a closed barrel type having a substantially O-shaped rear view with the tip abutted upward. Note that the contact of the tip of the crimping piece includes a state of contact by welding or the like, a state of contact that is merely contacted, or a state of substantially contact with a slight gap.
The said crimping | compression-bonding bottom surface means the opposing side part of the crimping | compression-bonding direction where a crimping piece is crimped | bonded by the crimper of a crimping applicator in a crimping | compression-bonding part.

  The crimp terminal includes a connection terminal including the crimp part and a female connector BOX, a male connector BOX, or a terminal connection part such as a screw insertion hole, or a connection terminal constituted by only the crimp part. .

  The groove shape is a rectangular cross-sectional groove shape, a polygonal cross-sectional groove shape, a semicircular shape formed by a distal-end-side groove side surface on the distal end side in the longitudinal direction, a proximal-side groove side surface on the proximal end side, and a groove bottom surface connecting these lower ends. The locking groove formed in the groove shape including the cross-sectional groove shape or the semi-elliptical cross-sectional groove shape is the above-described groove shape arranged in the width direction that is substantially perpendicular to the longitudinal direction. Including being a serration formed.

  In addition, the base end side is a rear side in the longitudinal direction on the side where the covered electric wire to be crimped of the crimp terminal is disposed, and the distal end side is a side opposite to the base end side of the crimp terminal, for example, a crimping portion. In the case of a crimp terminal constituted by a terminal connecting portion, it includes the front in the longitudinal direction on the terminal connecting portion side.

Further, the longitudinal direction refers to a direction connecting the base end side and the distal end side of the crimp terminal, and the width direction refers to a direction orthogonal to the longitudinal direction and along the crimp bottom surface.
The base end side portion is a base end side from the center in the longitudinal direction, that is, a rear portion in the longitudinal direction, in the crimping portion including the crimping bottom surface, in other words, a rear half portion in the longitudinal direction of the crimping portion.

  The compression amount compressed by the crimping of the conductor portion refers to a compressed volume based on the difference between the cross-sectional area of the conductor portion before the crimping and the cross-sectional area of the conductor portion compressed by the crimping piece.

  The other crimping bottom surface and the crimping piece are the crimping bottom surface and the crimping piece other than the crimping bottom surface and the crimping piece constituting the proximal end side conductor holding portion. For example, the distal end side from the locking groove or a plurality of locking grooves are arranged. In this case, it includes a crimping bottom surface and a crimping piece between the locking grooves.

  The base bellmouth is a tapered bulge that is bent upward at the end of the crimping piece when the crimping piece is curled with a wire crimper, and is on the side of the coated wire to be crimped out of both ends of the crimping piece This refers to the bell mouth produced at the end of Thereby, it is prevented that the longitudinal direction end surface of the crimping piece bites into the conductor portion and damage is caused.

The said crimping | compression-bonding jig means that it is a wire crimper which crimps | bonds a crimping piece by pinching with an anvil in a crimping applicator.
The start position of the inner surface side of the base end side bell mouth is the inner surface side of the crimping portion between the bell mouth bent and tapered by the corner portion of the wire crimper as a crimping jig and the flat portion of the crimping portion. The intersection at.

  As described above, the crimping portion for crimping the conductor portion of the covered electric wire in the crimp terminal is constituted by the crimping bottom surface on which the conductor portion is placed and the crimping pieces extending from both sides in the width direction of the crimping bottom surface, and the crimping is performed. A bottom-side conductor holding portion that holds the conductor portion between the crimping bottom surface and the crimping piece is formed on the bottom surface of the bottom surface with a groove-shaped locking groove formed on the bottom surface. The base end side conductor holding portion is provided with a conductor holding force improving structure for improving the conductor holding force for holding the conductor portion. And mechanical connections can be realized.

  Specifically, in addition to electrical connection with low electrical resistance due to biting deformation of the conductor portion due to the locking groove provided on the crimping bottom surface and mechanical connection with increased pulling resistance, conductor holding force By forming the base end side conductor holding portion provided with the conductor holding force improving structure that improves the mechanical connection, the mechanical connection can be further improved.

  In addition, since the proximal-side conductor holding part is disposed closer to the drawing point than the locking groove, the proximal-side conductor holding part can absorb a part of the drawing force acting on the conductor part. Further, it is possible to reduce a drawing load on the deformed portion that bites into the engaging groove of the conductor portion. Therefore, excellent connection can be realized by electrical connection and mechanical connection.

  In addition, in the base end side conductor holding portion, since the conductor portion is held in a plane by the crimping bottom surface and the crimping piece without using a separate member, for example, local deformation such as biting deformation into the locking groove. And can be held without damaging the conductor portion.

  In particular, since the conductor portion is a very fine electric wire that is thinner than a conventional stranded wire, it is easily broken by a load such as deformation, but can be securely held without damaging the conductor portion. With this, it is possible to reduce the drawing load acting on the conductor portion which is an extra fine wire, which is more preferable.

  Further, the conductor holding force improving structure is configured by a base end side portion which is the base end side from the center in the pressure-bonding bottom surface where the locking groove is arranged in the tip end side portion which is the front end side from the center in the longitudinal direction. Therefore, the conductor part can be held by the base end side conductor holding part formed in the latter half of the longitudinal direction of the crimping part, which is longer in the longitudinal direction than the normal base end side conductor holding part. And the conductor holding force can be improved efficiently.

  Therefore, even when the pulling force acts on the conductor portion, the pulling load acting on the deformed portion that has bite into the locking groove can be reduced, and an excellent electrical connection and mechanical connection can be realized. be able to.

  Further, a compression amount reducing means for reducing the compression amount of the conductor portion compressed by the crimping by the base end side conductor holding portion of the conductor holding force improving structure from the compression amount by the other crimping bottom surface and the crimping piece. With this configuration, it is possible to reduce the amount of compression compressed by crimping the crimping bottom surface constituting the proximal end side conductor holding portion and the conductor portion for holding by the crimping piece, and to reduce the compression load due to crimping. Therefore, it is possible to achieve both a connection state with high electrical connectivity at the locking groove and a connection state with high conductor holding power, that is, high mechanical connectivity.

  In addition, since the compression amount reducing means is constituted by a thin crimping piece having a small thickness at the proximal end conductor holding portion, it is reliably compressed at the proximal end conductor holding portion simultaneously with the crimping of the crimping pieces of other portions. Since the amount of crimping can be reduced, the compression load due to the crimping can be reduced, and the conductor holding force in the proximal end side conductor holding portion can be improved more reliably.

  In addition, it is possible to increase the conductor holding force of the conductor portion without using another member, and at the same time as the crimping of the crimping part using the conventional crimping jig, it can be held by the proximal end conductor holding part. High and convenient.

  In addition, since the compression amount reducing means is constituted by a taper crimping piece whose thickness gradually decreases toward the base end in the base end side conductor holding portion, it is ensured simultaneously with the crimping of the crimping piece of the other part. In addition, since the compression can be performed at the proximal end conductor holding portion with a reduced amount of compression, the compression load due to the crimping can be reduced, and the conductor holding force in the proximal end side conductor holding portion can be more reliably improved.

  In addition, since the amount of compression in the longitudinal direction of the conductor portion can be adjusted by the inclination of the taper surface in the taper crimping piece, the thickness of which is gradually reduced, an appropriate amount of compression can be set according to the diameter and material of the conductor portion. A connected state can be realized.

  Furthermore, the conductor holding force of the conductor part can be increased without using another member, and at the same time as the crimping of the crimping part using the conventional crimping jig, it can be held by the proximal conductor holding part, so it is versatile. Is highly convenient.

  In addition, when the crimping piece is crimped with a crimping jig, the inner side side start position is located near the distal end of the proximal end side conductor holding portion, and is configured by a proximal end bell mouth formed on the crimping piece. By doing so, the base end side bell mouth which becomes a compression amount reduction means can be formed simultaneously with the crimping | compression-bonding of a crimping | compression-bonding piece, and convenience is high.

  In addition, by configuring the base-side bell mouth formed on the crimping piece at a position where the inner surface side start position is near the tip of the base-side conductor holding portion, Since the amount of compression of the conductor portion can be reduced, the compression load due to crimping can be reduced, and the conductor holding force can be further improved.

  In addition, since the amount of compression in the longitudinal direction of the conductor part can be adjusted by the start position on the inner surface side of the base end side bell mouth, an appropriate amount of compression can be set according to the diameter or material of the conductor part, and an appropriate connection state can be set. Can be realized.

  Further, by forming the width side surface which is the width direction end portion of the locking groove with the inclined side surface whose upper side is inclined outward in the width direction, the conductor portion near the width direction end portion of the locking groove is deformed. The burden on the conductor portion can be reduced.

  In addition, since the plurality of the locking grooves are arranged at a predetermined interval in the longitudinal direction on the crimping bottom surface, the proximal-side conductor holding portion is most affected by the drawing load among the plurality of the locking grooves arranged. Because it is located on the proximal side closer to the pulling force force point than the proximal locking groove, a part of the pulling force acting on the deformed portion of the conductor portion that has bite into the proximal locking groove It can be absorbed by the side conductor holding portion, and the drawing load on the deformed portion that has bite into the locking groove can be reduced. Therefore, it is possible to realize a connection with high connection reliability, which is more excellent in electrical connection and mechanical connection.

  Specifically, with the above configuration, without using a separate member, the improvement in electrical connectivity by a plurality of locking grooves and the improvement in mechanical connectivity by the base end side conductor holding portion having a high conductor holding force are achieved, Connectivity can be improved more efficiently.

  According to this invention, the crimp terminal which can improve electrical connectivity and mechanical connectivity can be obtained.

  An embodiment of the present invention will be described below with reference to the drawings.

  1 is an explanatory view of the crimp terminal 1 by a perspective view, FIG. 2 is an explanatory view of the crimp terminal 1 by a plan view, etc. FIG. 3 is an explanatory view for explaining a crimp method of the wire barrel portion 10. 4 shows an explanatory view of the crimp terminal 1 in a crimped state by a longitudinal sectional view.

  1A shows a perspective view of the crimp terminal 1 divided at the center in the width direction, FIG. 1B shows a perspective view of the crimp terminal 1 and the covered electric wire 100 before crimping, and FIG. Shows a perspective view of the crimp terminal 1 in a crimped state.

2A shows a plan view of the crimp terminal 1 in a plate state before bending, FIG. 2B shows a plan view of the crimp terminal 1 subjected to bending, and FIG. 1 shows a longitudinal sectional view near the center in the width direction of the crimp terminal 1 subjected to bending.
4A is a cross-sectional view taken along line AA of the crimp terminal 1 shown in the cross-sectional position schematic diagram arranged in the vicinity of the center of FIG. 4, and FIG. Show.

In the crimp terminal 1 of the present invention, the wire barrel portion 10 for crimping the core wire 102 of the covered electric wire 100 includes a barrel bottom portion 11 on which the core wire 102 is placed and a wire barrel piece extending from both sides of the barrel bottom portion 11 in the width direction Y. And 12.
The barrel bottom 11 is provided with serrations 20 in the width direction Y, which are formed in a groove shape and are arranged in the longitudinal direction X at predetermined intervals.

  The rear core wire that holds the core wire 102 with the barrel bottom 11 and the wire barrel piece 12 on the rear side in the longitudinal direction X from the serration on the most proximal side among the three serrations 20 arranged in the longitudinal direction X The holding unit 10b is set.

And as a core wire holding force improvement structure which improves the core wire holding force of the back core wire holding part 10b which hold | maintains the core wire 102, in the barrel bottom part 11, it is a front end side from the barrel center Xc which is the approximate center of the longitudinal direction X, ie, the front half part. The serration 20 is arranged on a certain front bottom part 11a, and the rear bottom part 11b which is the base end side, that is, the rear half part from the barrel center Xc is set as the rear core wire holding part 10b.
Moreover, the width direction side surface 24 which is the edge part of the width direction Y in each serration 20 is formed in the taper surface in which upper direction inclines in the outer side direction of the width direction Y.

  The configuration of the crimp terminal 1 described above will be described in detail. The crimp terminal 1 includes a connector box 2 that allows insertion of a male connector (not shown) from the front to the rear in the longitudinal direction X, and the rear of the connector box 2. A wire barrel portion 10 disposed via a first transition 18 having a predetermined length, and an insulation barrel portion 15 disposed behind a wire barrel portion 10 via a second transition 19 having a predetermined length. Are integrally formed.

In addition, the wire barrel part 10 crimps and crimps | bonds the core wire 102 of the covered electric wire 100, and the insulation barrel part 15 caulks and fixes the insulation coating 101 of the covered electric wire 100.
In addition, with the recent reduction in size and weight of the covered electric wire 100, the core wire 102 is configured by bundling ultrafine electric wires that are thinner than conventional stranded wires.

  As shown in FIG. 2A, the crimp terminal 1 is three-dimensionally configured by bending from a plate state before assembly. The connector box 2 is formed of an inverted hollow square column body, and includes a contact piece 2a that is bent toward the rear in the longitudinal direction X and contacts the inserted male connector.

  As shown in FIG. 1B, the wire barrel portion 10 before crimping is composed of a barrel bottom portion 11 and wire barrel pieces 12 extending obliquely outward and upward from both sides in the width direction Y. The insulation barrel portion 15 which is formed in a U shape and is not crimped is also composed of a barrel bottom portion 17 and an insulation barrel piece 16 extending obliquely outward from both sides in the width direction Y. Is formed.

The front bottom portion 11a, which is the front portion of the barrel bottom portion 11 in the longitudinal direction X with respect to the barrel center Xc, is provided with three serrations 20 in the width direction Y arranged at predetermined intervals in the longitudinal direction X. .
As shown in FIG. 2A, these serrations 20 are formed in a rectangular cross-sectional groove shape having a width direction length approximately equal to the length of the barrel bottom portion 11 in the width direction Y.

  Specifically, the rectangular cross-sectional groove shape of the serration 20 includes a front side surface 21 and a rear side surface 22 that are orthogonal to the barrel bottom portion 11, and a groove bottom surface 23 that is parallel to the barrel bottom portion 11 that connects the lower ends of the front side surface 21 and the rear side surface 22. It is the groove | channel shape where the cross section of the concave longitudinal direction comprised by this is square.

  As shown in FIG. 1 (a), the wire barrel piece 12 extending obliquely outward and upward from both sides in the width direction Y of the barrel bottom portion 11 includes a front barrel piece 12a corresponding to the front bottom portion 11a in front of the barrel center Xc. The rear barrel piece 12b corresponding to the rear bottom portion 11b is integrally formed behind the barrel center Xc.

  In the state before crimping of the crimp terminal 1 configured as described above, the wire barrel portion 10 and the covered electric wire 100 are arranged as shown in FIG. 1B and crimped by the crimp applicator 200 shown in FIG. As shown in FIG. 1 (c), the core wire 102 is crimped by the wire barrel portion 10, and the crimp terminal 1 can be attached to the covered electric wire 100.

  Specifically, the covered electric wire 100 is placed from above the crimp terminal 1 so that the core wire 102 of the covered electric wire 100 is inside the wire barrel portion 10 and the vicinity of the front end of the insulating coating 101 is inside the insulation barrel portion 15. (See FIG. 1B), set on the anvil 201 of the crimping applicator 200 shown in FIG. 3 (see FIG. 3A).

  Then, as shown in FIG. 3 (b), the crimper 202 is lowered from above the wire barrel part 10, and the wire barrel part 10 is sandwiched between the anvil 201 and the crimper 202, as shown in FIG. The wire barrel piece 12 is curled.

  Simultaneously with the crimping of the wire barrel portion 10 described above, the crimper for the insulation barrel (not shown) is lowered from the top of the insulation barrel portion 15, and the anvil for the insulation barrel and the crimper for the insulation barrel are used for the insulation. The insulation barrel piece 16 is curled by sandwiching the insulation barrel portion 15.

  Thereby, the core wire 102 is pressed against the barrel bottom 11 by the wire barrel piece 12, and further, the insulation coating 101 is pressed against the barrel bottom 17 by the insulation barrel piece 16, and the double-clamped crimping state adjacent in the width direction Y is achieved. It can be configured (see FIG. 3C).

  At this time, as shown in the enlarged view of portion b in FIG. 4B, the rear bottom portion 11b, which is a portion behind the barrel center Xc in the barrel bottom portion 11, and the portion behind the barrel center Xc in the wire barrel piece 12. A portion that presses and holds the core wire 102 with the rear barrel piece 12b is set in the rear core wire holding portion 10b.

Thus, in the crimped state of the core wire 102 in the wire barrel portion 10, a plurality of core wires 102 are formed on the serration 20 as shown in an enlarged view of a portion in FIG. The bite deformation part 103 which bites and deforms and protrudes from the peripheral surface of the core wire 102 is formed.
Specifically, the biting deformation portion 103 that has bitten into the serration 20 is deformed into a quadrangular cross-sectional shape corresponding to the quadrangular cross-sectional groove shape of the serration 20 and protrudes to the bottom surface side of the core wire 102.

  In this manner, the core wire 102 is crimped by the wire barrel piece 12 in the wire barrel portion 10, and the bite deforming portion 103 that has bitten into the serration 20 is formed on the core wire 102, whereby the contact between the barrel bottom portion 11 and the core wire 102. The area is increased, and the electrical connectivity between the wire barrel portion 10 and the core wire 102 can be improved.

Further, the biting deformation portion 103 biting into the serration 20 can increase the resistance to the pulling direction of the core wire 102 with respect to the wire barrel portion 10, that is, the backward pulling force in the longitudinal direction X, thereby improving the mechanical connectivity. Can do.
Therefore, the electrical connectivity and mechanical connectivity as described above can be improved by the deformation of the core wire 102 due to the provision of the serrations 20 at the barrel bottom 11.

  Furthermore, by setting the rear core wire holding portion 10b constituted by the rear bottom portion 11b and the rear barrel piece 12b, the core wire 102 can be held more and the mechanical connection can be further improved.

  In addition, since the rear core wire holding part 10b is arranged on the proximal side near the force point of the pulling force acting on the core wire 102 from the serration 20, that is, in the rear in the longitudinal direction X, a part of the pulling force acting on the core wire 102 is obtained. The drawing load acting on the biting deformation portion 103 that can be absorbed by the rear core wire holding portion 10b and bite into the serration 20 of the core wire 102 can be reduced. Therefore, excellent connection can be realized by electrical connection and mechanical connection.

  Moreover, since the rear core wire holding part 10b is set at the rear part which is the base end side from the barrel center Xc of the wire barrel part 10, the length of the rear core wire holding part 10b can be set longer while maintaining the spacing between the serrations 20. Therefore, it is possible to effectively obtain the conductor holding force by the rear core wire holding portion 10b while ensuring the electrical connectivity by the biting deformation portion 103 that bites into the serration 20.

  Further, in the rear core wire holding portion 10b, since the core wire 102 is held in a plane by the rear bottom portion 11b and the rear barrel piece 12b, there is no local deformation like the biting deformation portion 103 into the serration 20, for example. 102 can be held without damaging it.

  Therefore, as in this embodiment, the core wire 102 is a very fine electric wire that is thinner than a conventional stranded wire, and therefore is easily broken by a load such as deformation, but can be reliably held without damaging the core wire 102. The holding portion 10b can reduce the drawing load acting on the core wire 102, which is an extra fine wire, and is more preferable.

  Moreover, since the width direction side surface 24 which is the edge part of the width direction Y in the serration 20 is formed in the taper side surface, the load by the deformation | transformation of the core wire 102 by the width direction side surface 24 of the left-right direction of the serration 20 is reduced. .

  Specifically, when the width direction side surface 24 is configured by an end surface orthogonal to the barrel bottom portion 11, the deformation of the core wire 102 in the vicinity of the width direction side surface 24 of the serration 20 is caused in the longitudinal direction X by the front side surface 21 and the rear side surface 22. In addition to the deformation, deformation in the width direction Y by the end surface orthogonal to the barrel bottom 11 is also applied, so that a load due to the deformation acts, and for example, there is a possibility of breaking due to application of a pulling force.

  However, by forming the width direction side surface 24 as a tapered side surface, the deformation in the width direction Y of the biting deformation portion 103 by the width direction side surface 24 becomes gentle, and the load due to the deformation in the width direction side surface 24 of the serration 20 is reduced. Can do. Therefore, a more reliable and stable mechanical connection can be realized.

  As described above, the crimp terminal 1 of the present embodiment is set to the rear core wire holding portion 10b that presses and holds the core wire 102 with the rear bottom portion 11b and the rear barrel piece 12b behind the barrel center Xc in the wire barrel portion 10. Compared with the case where both mechanical connectivity and electrical connectivity are achieved without using separate members, and both high mechanical reliability and electrical connectivity are achieved. Thus, both workability and cost are excellent.

  Moreover, since the crimp terminal 1 of a present Example can be crimped | bonded with the conventional crimp applicator 200 shown in FIG. 3, compared with the crimp terminal which requires a dedicated crimp applicator, for example, manufacturing cost is low. It can be reduced and is highly versatile and convenient.

  Furthermore, even in the case of a closed barrel type wire barrel having a substantially O-type in a rear view in which the tip of the wire barrel piece is abutted upward in advance, the wire barrel piece is disposed on the serration 20 in front of the barrel center Xc, The effect described above can be obtained by setting the rear to the rear core wire holding portion 10b.

  As described above, the rear core wire holding portion 10b that can realize holding with less damage by planar pressing is provided behind the serration 20 in the wire barrel portion 10, and as described above, is easily damaged by an excessive compressive load. Even if the core wire 102 is made of a fine wire that is thinner than a conventional stranded wire, the drawing resistance can be further improved. Of course, the same effect can be obtained even in a core wire made of a normal stranded wire. be able to.

Next, a crimp terminal 1a which is another embodiment will be described with reference to FIGS.
FIG. 5 shows an explanatory view of the crimp terminal 1a by a perspective view, FIG. 6 shows an explanatory view of the crimp terminal 1a by a plan view, etc. FIG. 7 shows an explanatory view by a longitudinal sectional view of the crimp terminal 1a in a crimped state, FIG. 8 shows a performance graph showing the relationship between the compression strength and the electrical resistance value depending on the compression ratio of the wire barrel portion.

  5 (a) shows a perspective view of the crimp terminal 1a divided at the center in the width direction, FIG. 5 (b) shows a perspective view of the crimp terminal 1a and the covered electric wire 100 before crimping, and FIG. 5 (c). Shows a perspective view of the crimp terminal 1a in a crimped state.

  FIG. 6A shows a plan view of the crimp terminal 1a in a plate state before bending, FIG. 6B shows a plan view of the crimp terminal 1a subjected to bending, and FIG. Is a longitudinal sectional view near the center in the width direction of the crimp terminal 1a subjected to bending.

  7A is a cross-sectional view taken along line AA of the crimp terminal 1a shown in the schematic cross-sectional position diagram arranged near the center of FIG. 7, and FIG. 7B is a cross-sectional view taken along line BB of the crimp terminal 1a. Show.

In the crimp terminal 1a of the present invention, the wire barrel portion 30 for crimping the core wire 102 of the covered electric wire 100 includes a barrel bottom portion 31 on which the core wire 102 is placed and a wire barrel piece extending from both sides of the barrel bottom portion 31 in the width direction Y. 32.
The barrel bottom 31 is provided with serrations 20 in the width direction Y, which are formed in a groove shape and are arranged in the longitudinal direction X at predetermined intervals.

  The rear core wire which holds the core wire 102 with the barrel bottom 31 and the wire barrel piece 32 on the rear side in the longitudinal direction X from the most proximal serration of the three serrations 20 arranged in the longitudinal direction X It is set in the holding unit 30b.

Then, as the core wire holding force improving structure for improving the core wire holding force of the rear core wire holding portion 30b holding the core wire 102, the amount of compression of the core wire 102 compressed by the crimping by the rear core wire holding portion 30b is different from that of the other barrel bottom 31. The compression amount reduction means is configured to reduce the compression amount by the wire barrel piece 32, and the compression amount reduction means is constituted by a thin portion 32a having a thin wire barrel piece 32 in the rear core wire holding portion 30b.
Furthermore, the width direction side surface 24 which is the edge part of the width direction Y in each serration 20 is formed in the taper surface which the upper side inclines in the outer side direction of the width direction Y.

  The configuration of the above-described crimp terminal 1a will be described in detail. The crimp terminal 1a is formed by integrating the connector box 2, the wire barrel portion 30, and the insulation barrel portion 15 in the same manner as the crimp terminal 1 of the first embodiment. It is composed.

  In addition, the covered electric wire 100 configured by the insulating coating 101 and the core wire 102, the connector box 2, the first transition 18, the second transition 19, and the insulation barrel portion 15 in the crimp terminal 1a are the same as the configurations in the first embodiment. Therefore, detailed description is omitted.

The barrel bottom portion 31 of the wire barrel portion 30 is provided with three serrations 20 in the width direction Y arranged at predetermined intervals in the longitudinal direction X, and the rear side from the serration 20 is set as a rear bottom portion 31a.
As shown in FIG. 6A, these serrations 20 are formed in a rectangular cross-sectional groove shape having a width direction length comparable to the width direction Y length of the barrel bottom 31.

  In addition, since the groove shape of the serration 20 is the same as the groove shape of the serration 20 of the crimp terminal 1 in the above-mentioned Example 1, detailed description is abbreviate | omitted. Further, similarly to the serrations 20 of the crimp terminal 1 in the first embodiment described above, the width direction side surface 24 that is an end portion in the width direction Y in each serration 20 is formed by a tapered surface.

  In the wire barrel piece 32 extending obliquely outward and upward from both sides in the width direction Y of the barrel bottom 31, the portion of the barrel bottom 31 corresponding to the rear bottom 31 a of the barrel bottom 31 and the thickness of the other portions The thin part 32a formed with about half the thickness is formed.

  Specifically, the thin wall portion 32 a is a side surface of the wire barrel piece 32 that protrudes in the width direction Y from the second transition 19 at the most proximal side of the three serrations 20, that is, behind the rear serration in the longitudinal direction X. It is formed in a substantially vertically long rectangular shape.

  As described in Example 1 above, the crimp terminal 1a configured in this way is arranged with the wire barrel portion 30 and the covered electric wire 100 as shown in FIG. By crimping with the crimping applicator 200 shown in FIG. 3, the core wire 102 is crimped with the wire barrel portion 30 as shown in FIG. 1 a can be attached to the covered electric wire 100.

  Thus, in the crimped state of the core wire 102 in the wire barrel portion 30, the lower side of the core wire 102 constituted by a plurality of serrations is shown in the enlarged view of a portion in FIG. In the same manner as the biting deformation portion 103 in the first embodiment, the bit 20 is deformed into a quadrangular cross-sectional shape corresponding to the quadrangular cross-sectional groove shape of the serration 20 and protrudes to the bottom surface side of the core wire 102.

  In this way, the core wire 102 is pressure-bonded by the wire barrel piece 12 in the wire barrel portion 30, and the bite deformation portion 303 that bites into the serration 20 is formed on the core wire 102, whereby the contact between the barrel bottom portion 31 and the core wire 102. The area is increased, and the electrical connectivity between the wire barrel portion 30 and the core wire 102 can be improved.

  Further, the biting deformation portion 303 that bites into the serration 20 can increase the resistance to the pulling direction of the core wire 102 with respect to the wire barrel portion 30, that is, the backward pulling force in the longitudinal direction X, thereby improving the mechanical connectivity. Can do.

Therefore, the electrical connectivity and the mechanical connectivity as described above can be improved by the deformation of the core wire 102 due to the provision of the serrations 20 at the barrel bottom 31.
Furthermore, by setting the rear core wire holding portion 30b behind the wire barrel portion 30, the core wire 102 can be held more and the mechanical connection can be further improved.

In addition, since the rear core wire holding part 30b is arranged on the proximal side near the force point of the pulling force acting on the core wire 102 from the serration 20, that is, in the longitudinal direction X, a part of the pulling force acting on the core wire 102 is obtained. The drawing load acting on the biting deformation portion 303 that can be absorbed by the rear core wire holding portion 30b and bite into the serration 20 of the core wire 102 can be reduced. Therefore, excellent connection can be realized by electrical connection and mechanical connection.
Further, in the rear core wire holding portion 30b, the core wire 102 is planarly held by the rear bottom portion 31a and the thin portion 32a, so that the core wire 102 can be held without being damaged.

  Furthermore, as a structure for improving the core wire holding force in the rear core wire holding portion 30b, the core wire 102 that is compressed by the crimping by the rear core wire holding portion 30b, which is configured by the thin-walled portion 32a of the wire barrel piece 32 in the rear core wire holding portion 30b. By providing the compression amount reducing means for reducing the amount of compression of the material from the amount of compression by the other barrel bottom 31 and the wire barrel piece 32, it is possible to realize a connection with higher electrical connectivity and mechanical connectivity.

  Specifically, as shown in FIG. 8 for explaining the reason, the performance graph showing the relationship between the crimping strength and the electric resistance value depending on the compression rate of the wire barrel portion 30 has a compression rate (original breakage) on the right side of the graph. When the ratio of the cross-sectional area after crimping to the area is high (that is, not compressed too much), the crimping strength, that is, the pulling strength of the core wire 102 increases at a peak of about 90%, and the mechanical connectivity is excellent. If the compression ratio on the left side of the graph is about 70% (that is, the amount of compression is increased), the electrical resistance value decreases and the electrical connectivity is improved. However, since the pulling strength of the core wire 102 is lowered, the pulling strength of the core wire 102 is set by setting the compression rate of the core wire 102 of the rear core wire holding portion 30b high, that is, by reducing the compression amount. It is possible to improve.

  The above is a performance graph in the case of a copper wire, and the optimum value changes in the case of a copper alloy or an aluminum wire. However, there is a difference between the peak position of the tensile strength and the bottom position of the electrical resistance, and the former tends to come to the side with a higher compressibility.

  On the other hand, by setting the compression amount of the portion to be crimped by the barrel bottom portion 31 and the wire barrel piece 32 other than the rear core wire holding portion 30b larger than the compression amount of the rear core wire holding portion 30b, that is, by setting the compression rate low, The electrical connectivity can be improved by making up for the decrease in electrical connectivity caused by reducing the amount of compression at the rear core wire holding portion 30b.

  Thus, in addition to the mechanical connectivity and electrical connectivity at the wire barrel portion 30 provided with the serrations 20, by providing the rear core wire holding portion 30b with high pullout strength, a connection state with high electrical connectivity, It is possible to realize a connection in which a connection state with high machine connectivity is compatible.

  In addition, since the core wire 102 is a fine extra-fine electric wire as compared with a conventional stranded wire, it is easy to break due to a load such as deformation, but without causing damage by holding the rear bottom portion 31a and the thin portion 32a in a plane. By providing the rear core wire holding portion 30b that can hold the core wire 102, it is possible to reduce the drawing load acting on the core wire 102, which is a very fine electric wire, and it is more preferable.

  Also, for example, the proximal end serration where the pulling force acts most is formed with a shallower groove depth than the front serration, and the deformation load is reduced by reducing the deformation amount of the deformed portion that bites into the proximal end serration. Compared with the case where the pulling strength of the core wire from the wire barrel portion is increased, the wire barrel portion 30 is configured so that the serration 20 has the same groove depth, and the core wire holding force is rearward of the serration 20. Since the high rear core wire holding portion 30b is disposed, the pullout strength can be reliably increased.

  This is because the wire barrel portion 30 of the present embodiment can absorb a part of the pulling force acting on the biting deformation portion 303 that bites into the serration 20 with a sufficient biting amount by the rear core wire holding portion 30b, so that the pulling resistance is sufficient. This is because the compression load caused by reducing the pulling load on the biting deformation portion 303 and reducing the amount of compression at the rear core wire holding portion 30b can be reduced.

  Thus, the enhancement of the drawing strength of the wire barrel portion 30 of the present embodiment is realized by a combination of the enhancement of the drawing resistance by securing the amount of biting, the reduction of the drawing load to the biting deformation portion 303 and the reduction of the compression load. Although the load can be reduced, the pulling strength can be further enhanced as compared with the wire barrel portion in which the rear serration in which the pulling resistance is reduced due to the decrease in the amount of biting deformation is formed shallowly.

  Moreover, since the width direction side surface 24 which is the edge part of the width direction Y in the serration 20 is formed in the taper side surface similarly to the serration 20 in the above-mentioned Example 1, the biting deformation part 303 of the width direction side surface 24 is formed. The deformation in the width direction Y becomes gradual, and the load caused by the deformation on the side surface 24 in the width direction of the serration 20 can be reduced. Therefore, a more reliable and stable mechanical connection can be realized.

  Moreover, since the crimp terminal 1 of a present Example can be crimped | bonded with the conventional crimp applicator 200 shown in FIG. 3, compared with the crimp terminal which requires a dedicated crimp applicator, for example, manufacturing cost is low. It can be reduced and is highly versatile and convenient.

  Furthermore, even in the case of a back barrel substantially O-type closed barrel type wire barrel in which the tip of the wire barrel piece is previously brought into contact with the upper portion, a thin portion corresponding to the thin portion 32a is provided at the upper rear portion of the wire barrel portion 30. The above effects can be obtained by forming.

  In addition, as described above, the rear core wire holding portion 30b that can realize holding with less damage by planar pressing is provided behind the serrations 20 in the wire barrel portion 30, and thus is easily damaged by an excessive compressive load. Even if the core wire 102 is made of a fine wire that is thinner than a conventional stranded wire, the drawing resistance can be further improved. Of course, the same effect can be obtained even in a core wire made of a normal stranded wire. be able to.

Next, a crimp terminal 1b according to a third embodiment will be described with reference to FIGS.
FIG. 9 is a perspective view of the crimp terminal 1b. FIG. 10 is a plan view of the crimp terminal 1b. FIG. 11 is a longitudinal sectional view of the crimp terminal 1b in a crimped state. Yes.

  9A shows a perspective view of the crimp terminal 1b divided at the center in the width direction, FIG. 9B shows a perspective view of the crimp terminal 1b and the covered electric wire 100 before crimping, and FIG. 9C. Shows a perspective view of the crimp terminal 1b in a crimped state.

  10A shows a plan view of the crimp terminal 1b in a plate state before the bending process, FIG. 10B shows a plan view of the crimp terminal 1b subjected to the bending process, and FIG. Is a longitudinal sectional view of the crimp terminal 1b that has been subjected to bending processing near the center in the width direction.

  11A shows a cross-sectional view taken along line AA of the crimp terminal 1b shown in the cross-sectional position schematic diagram arranged near the center of FIG. 11, and FIG. 11B shows a cross-sectional view taken along line BB of the crimp terminal 1b. Show.

In the crimp terminal 1b of the present invention, the wire barrel portion 40 for crimping the core wire 102 of the covered electric wire 100 includes a barrel bottom portion 41 on which the core wire 102 is placed and a wire barrel piece extending from both sides of the barrel bottom portion 41 in the width direction Y. 42.
The barrel bottom portion 41 is provided with serrations 20 in the width direction Y, which are formed in a groove shape and are arranged in the longitudinal direction X at a predetermined interval.

  The rear core wire that holds the core wire 102 with the barrel bottom 41 and the wire barrel piece 42 on the rear side in the longitudinal direction X from the most proximal side serration among the three serrations 20 arranged in the longitudinal direction X The holding unit 40b is set.

And as a core wire holding force improvement structure which improves the core wire holding force of the back core wire holding part 40b which hold | maintains the core wire 102, the compression amount of the core wire 102 compressed by the crimping | compression-bonding by the back core wire holding part 40b is compared with the other barrel bottom part 41. It comprises compression amount reduction means for reducing the compression amount by the wire barrel piece 42, and the compression amount reduction means comprises a taper piece 42a whose thickness gradually decreases toward the base end in the longitudinal direction X in the rear core wire holding portion 40b. is doing.
Furthermore, the width direction side surface 24 which is the edge part of the width direction Y in each serration 20 is formed in the taper surface which the upper side inclines in the outer side direction of the width direction Y.

  The configuration of the crimp terminal 1b described above will be described in detail. The crimp terminal 1b has the same configuration as the crimp terminal 1a of the second embodiment described above, and includes the connector box 2, the wire barrel portion 40, the insulation barrel portion 15, and the like. Are integrally formed.

  Since the configuration in the present embodiment is the same as the configuration except that the taper piece 42a is different from the thin portion 32a in the second embodiment, the taper piece 42a will be described in detail. The rear bottom 41a is set behind the three serrations 20 in the barrel bottom 41 in the same manner as the rear bottom 31a set behind the barrel bottom 31 in the second embodiment.

  As with the thin portion 32a of the crimp terminal 1b of the second embodiment, the taper piece 42a is provided with a rear core wire holding portion 40b behind the wire barrel portion 40, and obliquely outwardly upward from both sides in the width direction Y of the barrel bottom portion 41. In the extending wire barrel piece 42, a taper piece 42 a is formed at the portion corresponding to the rear bottom 41 a behind the serration 20 and gradually decreasing in thickness toward the base end in the longitudinal direction X.

  Specifically, the taper piece 42 a is a side surface of the wire barrel piece 42 that protrudes in the width direction Y from the second transition 19 at the most proximal side of the three serrations 20, that is, behind the rear serration in the longitudinal direction X. It is formed in a substantially vertically long rectangular shape as viewed from the side, and is formed in a tapered shape whose thickness gradually decreases from the front to the rear in the longitudinal direction X of the substantially vertically long rectangular shape as viewed from the side.

  The front end in the longitudinal direction X of the taper piece 42a is formed with the same thickness as the other wire barrel pieces 42, and the rear end in the longitudinal direction X of the taper piece 42a having the smallest thickness is 1/3 of the thickness of the front end. It is formed to a thickness of about.

  As described above in the first embodiment, the crimp terminal 1b configured as described above is arranged with the wire barrel portion 40 and the covered electric wire 100 as shown in FIG. By crimping with the crimping applicator 200 shown in FIG. 3, the core wire 102 is crimped with the wire barrel portion 40 as shown in FIG. 9C, and crimped in a two-sided crimping state adjacent to the width direction Y. The terminal 1b can be attached to the covered electric wire 100.

  Thus, in the crimped state of the core wire 102 in the wire barrel portion 40, the lower side of the core wire 102 constituted by a plurality of serrations is shown in the enlarged view of a portion in FIG. The bite deformation part 403 having a quadrangular cross-sectional shape protruding from the peripheral surface of the core wire 102 is formed.

  Thus, by crimping the core wire 102 with the wire barrel piece 12 in the wire barrel portion 40, the biting deformation portion 403 that has bitten into the serration 20 is applied to the core wire 102 in the same manner as the crimp terminal 1 of the first embodiment. By being formed, the contact area between the barrel bottom 41 and the core wire 102 is increased, and the electrical connectivity between the wire barrel portion 40 and the core wire 102 can be improved.

  Further, the biting deformation portion 403 that bites into the serration 20 can increase the resistance to the pulling direction of the core wire 102 with respect to the wire barrel portion 40, that is, the backward pulling force in the longitudinal direction X, thereby improving the mechanical connectivity. Can do.

Therefore, the electrical connectivity and the mechanical connectivity as described above can be improved by the deformation of the core wire 102 due to the provision of the serrations 20 at the barrel bottom 41.
Furthermore, by setting the rear core wire holding portion 40b behind the wire barrel portion 40, the core wire 102 can be held more and the mechanical connection can be further improved.

  In addition, since the rear core wire holding portion 40b is disposed on the proximal side near the force point of the pulling force acting on the core wire 102 from the serration 20, that is, on the rear side in the longitudinal direction X, a part of the pulling force acting on the core wire 102 is obtained. The pulling load that can be absorbed by the rear core wire holding portion 40b and that acts on the biting deformation portion 403 that bites into the serration 20 of the core wire 102 can be reduced. Therefore, excellent connection can be realized by electrical connection and mechanical connection.

  Further, in the rear core wire holding portion 40b, the core wire 102 is planarly held by the rear bottom portion 41a and the taper piece 42a, and therefore, there is no local deformation like the biting deformation portion 403 into the serration 20, for example, the core wire 102. Can be held without damaging it.

  Furthermore, as the structure for improving the core wire holding force in the rear core wire holding portion 40b, the rear core wire holding portion 40b is configured by a tapered piece 42a whose thickness gradually decreases toward the base end in the longitudinal direction X. By providing a compression amount reducing means for reducing the compression amount of the core wire 102 compressed by crimping compared to the compression amount by the other barrel bottom 41 and the wire barrel piece 42, a connection with higher electrical connectivity and mechanical connectivity can be achieved. Can be realized.

  As described above with reference to FIG. 8, the pulling strength of the core wire 102 can be improved by setting the compression rate of the core wire 102 of the rear core wire holding portion 40b high, that is, by reducing the amount of compression. By setting the compression amount of the portion to be crimped by the barrel bottom 41 and the wire barrel piece 42 other than the core wire holding portion 40b to be larger than that of the rear core wire holding portion 40b, that is, by setting the compression rate to be low, the rear core wire holding portion 40b portion The electrical connectivity is improved by making up for the decrease in electrical connectivity caused by reducing the amount of compression.

  Thus, in addition to the mechanical connectivity and electrical connectivity at the wire barrel portion 40 provided with the serration 20, by providing the rear core wire holding portion 40b with high pullout strength, a connection state with high electrical connectivity, It is possible to realize a connection in which a connection state with high machine connectivity is compatible.

  Further, as in the present embodiment, the core wire 102 is a very fine electric wire that is thinner than a conventional stranded wire, and thus is easily broken by a load such as deformation, but is held in a plane by the rear bottom portion 41a and the taper piece 42a. By providing the rear core wire holding portion 40b that can hold the core wire 102 without causing damage, the drawing load acting on the core wire 102, which is a very fine electric wire, can be reduced, which is more preferable.

  Also, for example, the proximal end serration where the pulling force acts most is formed with a shallower groove depth than the front serration, and the deformation load is reduced by reducing the deformation amount of the deformed portion that bites into the proximal end serration. Compared with the case where the pulling strength of the core wire from the wire barrel portion is increased, the wire barrel portion 40 has a serration holding force behind the serration 20 after the serrations 20 are all configured with the same groove depth. Since the high rear core wire holding portion 40b is arranged, the pullout strength can be reliably increased.

  This is because the wire barrel portion 40 of the present embodiment can absorb a part of the pulling force acting on the biting deformation portion 403 that has bitten into the serration 20 with a sufficient biting amount by the rear core wire holding portion 40b, so that it has a sufficient pulling resistance. This is because the compression load caused by reducing the pulling load on the biting deformation portion 403 and reducing the amount of compression at the rear core wire holding portion 40b can be reduced.

  Thus, the enhancement of the drawing strength of the wire barrel portion 40 of the present embodiment is realized by a combination of the enhancement of the drawing resistance by securing the amount of biting, the reduction of the drawing load to the biting deformation portion 403 and the reduction of the compression load, Although the load can be reduced, the pulling strength can be further enhanced as compared with the wire barrel portion in which the rear serration in which the pulling resistance is reduced due to the decrease in the amount of biting deformation is formed shallowly.

  Similarly to the serration 20 in the first embodiment described above, the width side surface 24 that is an end portion in the width direction Y of the serration 20 is formed by a tapered side surface, and therefore the biting deformation portion 403 by the width direction side surface 24 is formed. Thus, the deformation in the width direction Y becomes moderate, and the load due to the deformation on the side surface 24 in the width direction of the serration 20 can be reduced. Therefore, a more reliable and stable mechanical connection can be realized.

  Moreover, since the crimp terminal 1 of a present Example can be crimped | bonded with the conventional crimp applicator 200 shown in FIG. 3, compared with the crimp terminal which requires a dedicated crimp applicator, for example, manufacturing cost is low. It can be reduced and is highly versatile and convenient.

  Furthermore, in the case of a closed barrel type wire barrel having a substantially O-shaped rear view in which the tip of the wire barrel piece is abutted upward in advance, a taper portion corresponding to the taper piece 42 a is provided at the upper rear portion of the wire barrel portion 40. The above effects can be obtained by forming.

  In addition, as described above, the rear core wire holding portion 40b that can realize holding with less damage by planar pressing is provided behind the serrations 20 in the wire barrel portion 40, and thus is easily damaged by an excessive compression load. Even if the core wire 102 is made of a fine wire that is thinner than a conventional stranded wire, the drawing resistance can be further improved. Of course, the same effect can be obtained even in a core wire made of a normal stranded wire. be able to.

Next, a crimp terminal 1c according to a fourth embodiment will be described with reference to FIGS.
12 is an explanatory view of the crimp terminal 1c in a perspective view, FIG. 13 is an explanatory view of the crimp terminal 1c in a plan view, and FIG. 14 is an explanatory view of the crimp terminal 1c in a crimped state in a longitudinal sectional view. Yes.

  12A shows a perspective view of the crimp terminal 1c divided at the center in the width direction, FIG. 12B shows a perspective view of the crimp terminal 1c and the covered electric wire 100 before crimping, and FIG. Shows a perspective view of the crimp terminal 1c in a crimped state.

  FIG. 13 (a) shows a plan view of the crimp terminal 1c in a plate state before bending, FIG. 13 (b) shows a plan view of the crimp terminal 1c subjected to bending, and FIG. 13 (c). Is a longitudinal sectional view near the center in the width direction of the crimp terminal 1c that has been bent.

  14A is a cross-sectional view taken along line AA of the crimp terminal 1c shown in the cross-sectional position schematic diagram arranged near the center of FIG. 14, and FIG. 14B is a cross-sectional view taken along line BB of the crimp terminal 1c. Show.

In the crimp terminal 1c of the present invention, the wire barrel portion 50 for crimping the core wire 102 of the covered electric wire 100 includes a barrel bottom portion 51 on which the core wire 102 is placed and a wire barrel piece extending from both sides of the barrel bottom portion 51 in the width direction Y. 52.
The barrel bottom 51 is provided with serrations 20 in the width direction Y which are formed in a groove shape and are arranged in the longitudinal direction X at a predetermined interval.

  The rear core wire that holds the core wire 102 with the barrel bottom 51 and the wire barrel piece 52 on the rear side in the longitudinal direction X from the serration on the most proximal side among the three serrations 20 arranged in the longitudinal direction X The holding unit 50b is set.

  Then, as the core wire holding force improving structure for improving the core wire holding force of the rear core wire holding portion 50b that holds the core wire 102, the compression amount of the core wire 102 that is compressed by the crimping by the rear core wire holding portion 50b is changed with the other barrel bottom portion 51. It is composed of a compression amount reducing means for reducing the compression amount by the wire barrel piece 52, and when the wire barrel piece 52 is crimped by the crimper 202 ', the position of the rear bell mouth tip 62a holds the rear core wire. The rear bell mouth 62 formed on the wire barrel piece 52 is arranged in the vicinity of the tip of the portion 50b.

  The configuration of the above-described crimp terminal 1c will be described in detail. The crimp terminal 1c is formed by integrating the connector box 2, the wire barrel portion 50, and the insulation barrel portion 15 in the same manner as the crimp terminal 1 in the first embodiment. It is configured.

  In addition, the covered electric wire 100 constituted by the insulation coating 101 and the core wire 102, the connector box 2, the first transition 18, the second transition 19, and the insulation barrel portion 15 in the crimp terminal 1c are the same as those in the first embodiment. Since it is a structure, detailed description is abbreviate | omitted.

The barrel bottom portion 51 of the wire barrel portion 50 is provided with three serrations 20 in the width direction Y arranged at predetermined intervals in the longitudinal direction X.
As shown in FIG. 13A, these serrations 20 are formed in a rectangular cross-sectional groove shape having a width direction length comparable to the width direction Y length of the barrel bottom 51.

  In addition, since the groove shape of the serration 20 is the same as the groove shape of the serration 20 of the crimp terminal 1 etc. in the above-mentioned Example 1, detailed description is abbreviate | omitted. Further, similarly to the serrations 20 such as the crimp terminal 1 in the first embodiment described above, the width direction side surface 24 that is an end portion in the width direction Y in each serration 20 is formed by a tapered surface.

  In addition, in the wire barrel piece 52 extending from the both sides in the width direction Y of the barrel bottom 51 obliquely upward to the base end side from the serration 20 in the barrel bottom 51, that is, the rear portion, the rear bottom 51 a. A portion corresponding to the rear bottom portion 51a on the end side, that is, the rear portion is set to the rear barrel piece 52a.

  As described in the first embodiment, the crimp terminal 1c configured as described above is arranged with the wire barrel portion 50 and the covered electric wire 100 as shown in FIG. 3, the core wire 102 is crimped by the wire barrel portion 50 sandwiched between the crimper 202 ′ and the anvil 201 as shown in FIG. 12C by crimping with the crimping applicator 200 shown in FIG. The crimp terminal 1c can be attached to the covered electric wire 100 in a state where the two crimps are adjacent to each other.

  Note that, by curling the wire barrel piece 52 by the crimper 202 ′, tapered bell mouths 60 are formed at both ends in the longitudinal direction X of the wire barrel piece 52, and formed at the front end in the longitudinal direction X of the wire barrel piece 52. The bell mouth is a front bell mouth 61, and the bell mouth formed at the rear end in the longitudinal direction X of the wire barrel piece 52 is a rear bell mouth 62.

  Further, the rear bell mouth 62 is formed in a taper shape that is approximately twice as large as the front bell mouth 61, and is a tapered tip, which is on the inner side of the flat portion of the wire barrel piece 52 and the taper shape. The rear bell mouth tip 62a that is the intersection, that is, the folding point where the rear bell mouth 62 is formed is formed to be the tip of the rear core wire holding portion 50b.

  Accordingly, as shown in the enlarged view of the portion b in FIG. 14B, the rear bell mouth 62 is configured in a tapered shape formed by the rear barrel piece 52 b of the wire barrel piece 52.

  Thus, in the crimped state of the core wire 102 in the wire barrel portion 50, the lower side of the core wire 102 constituted by a plurality of serrations is shown in FIG. 14 (a), which is a sectional view in the longitudinal direction of the connected state. The bite deformation part 503 that bites into and deforms 20 and protrudes from the peripheral surface of the core wire 102 is formed.

  Specifically, the biting deformation portion 503 that has bitten into the serration 20 is deformed into a quadrangular cross-sectional shape corresponding to the quadrangular cross-sectional groove shape of the serration 20 in the same manner as the biting deformation portion in the other embodiments, and on the bottom side of the core wire 102. It will protrude.

  In this way, by crimping the core wire 102 with the wire barrel piece 12 in the wire barrel portion 50, the biting deformation portion 503 that bites into the serration 20 is formed in the core wire 102 as in the first embodiment. Thereby, the contact area of the barrel bottom 51 and the core wire 102 is increased, and the electrical connectivity between the wire barrel portion 50 and the core wire 102 can be improved.

  Further, the biting deformation portion 503 that bites into the serration 20 can increase the resistance to the pulling direction of the core wire 102 with respect to the wire barrel portion 50, that is, the backward pulling force in the longitudinal direction X, thereby improving the mechanical connectivity. Can do.

Therefore, the electrical connectivity and the mechanical connectivity as described above can be improved by the deformation of the core wire 102 due to the provision of the serrations 20 at the barrel bottom 51.
Furthermore, by setting the rear core wire holding portion 50b behind the wire barrel portion 50, the core wire 102 can be held more and the mechanical connection can be further improved.

  In addition, since the rear core wire holding part 50b is arranged on the proximal side near the power point of the pulling force acting on the core wire 102 from the serration 20, that is, rearward in the longitudinal direction X, a part of the pulling force acting on the core wire 102 is obtained. The drawing load acting on the biting deformation portion 503 that can be absorbed by the rear core wire holding portion 50 b and bite into the serration 20 of the core wire 102 can be reduced. Therefore, excellent connection can be realized by electrical connection and mechanical connection.

  Further, in the rear core wire holding portion 50b, the core wire 102 is planarly held by the rear bottom portion 51a and the rear barrel piece 52a, so that there is no local deformation like the biting deformation portion 503 into the serration 20, for example. 102 can be held without damaging it.

  Furthermore, as a structure for improving the core wire holding force in the rear core wire holding portion 50b, the structure is compressed by crimping by the rear core wire holding portion 50b formed by the tapered rear bell mouth 62 formed by the rear barrel piece 52a of the rear core wire holding portion 50b. By providing a compression amount reducing means for reducing the compression amount of the core wire 102 from the compression amount by the other barrel bottom 51 and the wire barrel piece 52, it is possible to realize a connection with higher electrical connectivity and mechanical connectivity. it can.

  As described above with reference to FIG. 8, the pulling strength of the core wire 102 can be improved by setting the compression rate of the core wire 102 of the rear core wire holding portion 50b high, that is, by reducing the amount of compression. By setting the compression amount of the portion to be crimped by the barrel bottom 51 and the wire barrel piece 52 other than the core wire holding portion 50b to be larger than that of the rear core wire holding portion 50b, that is, by setting the compression rate to be low, in the rear core wire holding portion 50b portion. The electrical connectivity is improved by making up for the decrease in electrical connectivity caused by reducing the amount of compression.

  Thus, in addition to the mechanical connectivity and electrical connectivity at the wire barrel portion 50 equipped with the serrations 20, by providing the rear core wire holding portion 50b with high pullout strength, a connection state with high electrical connectivity, It is possible to realize a connection in which a connection state with high machine connectivity is compatible.

  Moreover, since the core wire 102 is a fine extra-fine electric wire as compared with the conventional stranded wire, it is easily broken by a load such as deformation, but it is not damaged by being held flat by the barrel bottom 51 and the rear barrel piece 52a. By providing the rear core wire holding portion 50b capable of holding the core wire 102, it is possible to reduce the drawing load acting on the core wire 102 which is a very fine electric wire, which is more preferable.

  Also, for example, the proximal end serration where the pulling force acts most is formed with a shallower groove depth than the front serration, and the deformation load is reduced by reducing the deformation amount of the deformed portion that bites into the proximal end serration. Compared with the case where the pulling strength of the core wire from the wire barrel portion is increased, the wire barrel portion 50 has a serration holding force behind the serration 20 after all the serrations 20 are configured with the same groove depth. Since the high rear core wire holding portion 50b is disposed, the pullout strength can be reliably increased.

  This is because the wire barrel portion 50 of the present embodiment can absorb a part of the pulling force acting on the biting deformation portion 503 that has bitten into the serration 20 with a sufficient biting amount by the rear core wire holding portion 50b, so that the pulling resistance is sufficient. This is because the compression load caused by reducing the pulling load on the biting deformation portion 503 and reducing the amount of compression at the rear core wire holding portion 50b is reduced while the force can be exerted.

  Thus, the enhancement of the drawing strength of the wire barrel portion 50 of the present embodiment is realized by a combination of the enhancement of the drawing resistance by securing the amount of biting, the reduction of the drawing load on the biting deformation portion 503 and the reduction of the compression load. Although the load can be reduced, the pulling strength can be further enhanced as compared with the wire barrel portion in which the rear serration in which the pulling resistance is reduced due to the decrease in the amount of biting deformation is formed shallowly.

  Further, similarly to the serration 20 in the first embodiment described above, the width side surface 24 that is an end portion in the width direction Y of the serration 20 is formed by a tapered side surface, so that the biting deformation portion 503 by the width direction side surface 24 is formed. Thus, the deformation in the width direction Y becomes moderate, and the load due to the deformation on the side surface 24 in the width direction of the serration 20 can be reduced. Therefore, a more reliable and stable mechanical connection can be realized.

  Furthermore, even when the wire barrel piece is a closed barrel type wire barrel having a substantially O-type rear view in which the tip of the wire barrel piece is abutted upward in advance, a large size corresponding to the rear bell mouth 62 at the upper rear portion of the wire barrel portion 50. The above effects can be obtained by forming a bell mouth.

  In addition, as described above, the rear core wire holding portion 50b capable of realizing holding with less damage by planar crimping is provided behind the serration 20 in the wire barrel portion 50, so that it is easily damaged by an excessive compression load as described above. Even if the core wire 102 is made of a fine wire that is thinner than a conventional stranded wire, the drawing resistance can be further improved. Of course, the same effect can be obtained even in a core wire made of a normal stranded wire. be able to.

In correspondence between the configuration of the present invention and the above-described embodiment,
The conductor portion of the present invention corresponds to the core wire 102,
Similarly,
The crimping part corresponds to the wire barrel part 10, 30, 40, 50,
The crimping bottom surface corresponds to the barrel bottom 11, 31, 41, 51,
The crimping piece corresponds to the wire barrel piece 12, 32, 42, 52,
The locking groove corresponds to serration 20,
The proximal end side conductor holding portions correspond to the rear core wire holding portions 10b, 30b, 40b, 50b,
The longitudinal center corresponds to the barrel center Xc,
The tip side portion corresponds to the front bottom portion 11a,
The proximal end portion corresponds to the rear bottom 11b,
The thin crimping piece corresponds to the thin part 32a,
The taper crimping piece corresponds to the taper piece 42a,
The inner side start position corresponds to the rear bell mouth tip 62a,
The proximal bell mouth corresponds to the rear bell mouth 62,
The tip side corresponds to the front side in the longitudinal direction X,
Although the base end side corresponds to the rear side in the longitudinal direction X, the present invention is not limited to the configuration of the above-described embodiment, and many embodiments can be obtained.

Explanatory drawing by the perspective view of a crimp terminal. Explanatory drawing of a crimp terminal. Explanatory drawing explaining the crimping | compression-bonding method of a wire barrel part. Explanatory drawing by the longitudinal cross-sectional view of the crimp terminal in the crimped state. Explanatory drawing by the perspective view of the crimp terminal of 2nd Example. Explanatory drawing of the crimp terminal of 2nd Example. Explanatory drawing by the longitudinal cross-sectional view of the crimp terminal of the crimped state of 2nd Example. The performance graph which shows the relationship between the crimping | compression-bonding intensity | strength by the compression rate of a wire barrel part, and an electrical resistance value. Explanatory drawing by the perspective view of the crimp terminal of a 3rd Example. Explanatory drawing of the crimp terminal of a 3rd Example. Explanatory drawing by the longitudinal cross-sectional view of the crimp terminal of the crimped state of 3rd Example. Explanatory drawing by the perspective view of the crimp terminal of a 4th Example. Explanatory drawing of the crimp terminal of a 4th Example. Explanatory drawing by the longitudinal cross-sectional view of the crimp terminal of the crimping state of a 4th Example.

Explanation of symbols

1, 1a, 1b, 1c ... crimp terminals 10, 30, 40, 50 ... wire barrel parts 10b, 30b, 40b, 50b ... rear core wire holding parts 11, 31, 41, 51 ... barrel bottom part 11a ... front bottom part 11b ... rear part Bottom part 12, 32, 42, 52 ... Wire barrel piece 20 ... Serration 24 ... Width side surface 32a ... Thin part 42a ... Tapered piece 62 ... Rear bell mouth 62a ... Rear bell mouth tip 100 ... Covered wire 102 ... Core wire 202 '... Crimper X ... longitudinal direction Xc ... barrel center Y ... width direction

Claims (8)

The crimping part that crimps the conductor part of the covered wire
It comprises a crimping bottom surface for placing the conductor portion, and a crimping piece extending from both sides in the width direction of the crimping bottom surface,
On the crimping bottom surface,
Equipped with a groove in the width direction formed in the groove shape,
To the base end side from the locking groove,
A base end side conductor holding portion that holds the conductor portion with the crimping bottom surface and the crimping piece is formed,
In the base end side conductor holding part,
A crimp terminal provided with a conductor holding force improving structure for improving a conductor holding force for holding the conductor portion. The conductor holding force improving structure,
2. The crimp terminal according to claim 1, wherein the crimp bottom surface in which the locking groove is disposed in a distal end portion that is a distal end side from the longitudinal center is a proximal end portion that is a proximal end side from the center. The conductor holding force improving structure,
The crimping | compression-bonding of Claim 1 comprised by the compression amount reduction means which reduces the compression amount of the said conductor part compressed by the crimping | compression-bonding by the said base end side conductor holding part from the compression amount by the said other crimping | compression-bonding bottom face and the said crimping piece. Terminal. The compression amount reducing means;
The crimp terminal according to claim 3, wherein the crimp terminal is constituted by a thin crimping piece having a small thickness in the base end side conductor holding portion. The compression amount reducing means;
The crimp terminal according to claim 3, wherein the crimp terminal is configured by a taper crimp piece whose thickness gradually decreases toward the base end in the base end side conductor holding portion. The compression amount reducing means;
When the crimping piece is crimped with a crimping jig, the inner surface side start position is located near the distal end of the proximal end side conductor holding portion, and is configured by a proximal end bell mouth formed on the crimping piece. Item 4. The crimp terminal according to Item 3. A side surface in the width direction that is an end in the width direction in the locking groove,
The crimp terminal according to any one of claims 1 to 6, wherein an upper side is formed by an inclined side surface that is inclined outward in the width direction. The locking groove,
The crimp terminal according to claim 1, wherein a plurality of crimp terminals are arranged at predetermined intervals in the longitudinal direction of the crimp bottom surface.

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