JP5521754B2 - Crimp terminal and bolt terminal - Google Patents

Description

  The present invention relates to a crimp terminal and a bolt terminal connected to a terminal of an electric wire by crimping a barrel.

  The LA terminal, which is an example of a bolt fastening terminal, has a shape in which a wire barrel and an insulation barrel are continuously connected to the rear edge of a ring-shaped plate-like connection portion having a bolt hole opened via a neck portion, Terminals of the core wire and the insulation coating in the electric wire are caulked and crimped to a wire barrel and an insulation barrel, respectively (for example, see Patent Document 1). For example, the connection portion of the LA terminal is applied to the body of an automobile, and a bolt passed through the bolt hole is screwed in and fixed to ground.

JP 2008-305741 A (FIG. 4)

In this type of LA terminal, the body and neck are required to have strength against bending, etc. because of the bolting to the body. Therefore, a thick metal plate having a thickness of 0.6 mm or 0.8 mm is used as a material. On the other hand, when the wire barrel is caulked to the core wire of the electric wire, it is called a heart shape and is caulked in the form of biting into the core wire while abutting the protruding ends of both barrel pieces. For example, the wire size is 2 sq (cross-sectional area: mm2 ) In the case of the following thin wires, if the barrel piece of the wire barrel is thick as described above, it will not sufficiently bite into the core wire when crimped, resulting in insufficient retaining force (holding force). There was a problem. That said, using a thin material would cause insufficient strength.
The present invention has been completed based on the above circumstances, and its purpose is to provide a sufficient retaining force even when crimped to a thin electric wire while ensuring strength against bending. The present invention provides a crimp terminal and a bolt terminal.

The crimp terminal of the present invention is a crimp terminal provided with a wire barrel to be crimped to the end of a core wire in an electric wire via a neck portion behind a connection portion with a conductive member, and extends from the neck portion to the bottom portion of the wire barrel. A conductive reinforcing plate to be stacked is provided , a side wall is formed on the neck, and a side wall is also formed on a portion overlapping the neck of the reinforcing plate, so that the side wall of the neck and the side wall of the reinforcing plate It has a double plate structure and is characterized in that the wire barrel is caulked and crimped to the core wire of the electric wire together with the reinforcing plate.
The strength from bending to the bottom of the wire barrel is secured from the neck to the wire barrel, while the tip end of the wire barrel is kept relatively thin. It is easy to bite in and it is possible to increase the crimping force on the core wire.

  Further, the reinforcing plate may be integrally formed so as to be foldable via a connecting portion. As compared with the case of a separate body, assembly work and component management are facilitated.

The bolting terminal of the present invention includes a flat plate-like connection portion having a bolt hole opened, a neck portion extending from a part of the periphery of the connection portion, and the neck portion so that the end of the core wire in the electric wire is crimped. And a conductive reinforcing plate overlaid on the connecting portion, the neck portion, and the bottom of the wire barrel, and a side wall is formed on the neck portion. In addition, a side wall is also formed on the portion of the reinforcing plate that overlaps the neck portion, so that a double plate structure is formed by the side wall of the neck portion and the side wall of the reinforcing plate. It is characterized in that the wire barrel is caulked and crimped to the core wire of the electric wire.
The thickness of the connection part, neck part, and bottom part of the wire barrel is increased, so that strength such as bending is ensured, while the tip end side of the wire barrel is relatively thin, so that the electric wire when caulked It is easy to bite into the core wire, and it is possible to increase the crimping force on the core wire.

The following configuration may also be used.
(1) The said reinforcement board is integrally formed so that folding is possible via a connection part. As compared with the case of a separate body, assembly work and component management are facilitated.
(2) The said reinforcement board is connected and provided in the opposite side on both sides of the said neck part in the said connection part. Since the unfolded shape is aligned with the reinforcing plate, the connecting portion, the neck portion, and the wire barrel, it is excellent in material removal when formed by pressing from a hoop material.
(3) The reinforcing plate is connected and provided at a position at an angular interval of approximately 90 degrees from the neck at the periphery of the connecting portion. It is easy to fold the reinforcing plate.

(4) An insulation barrel is provided at the rear of the wire barrel so that the end of the insulation coating of the electric wire can be crimped, while the extended end of the reinforcing plate is located at the bottom of the insulation barrel. It does not reach the bottom of the wire barrel.
When the end of the electric wire is fitted and set in both barrels before caulking, the end surface of the insulating coating of the electric wire hits the extended end of the reinforcing plate, which can be used for positioning in the axial direction. After caulking, since the bottom portion of the insulation barrel with the caulking insulation coating having a large diameter is formed one step thinner, misalignment between both barrels is avoided.

  According to the present invention, a sufficient retaining force can be obtained even when crimped to a thin electric wire while ensuring strength against bending or the like.

The top view which shows the manufacturing process of the ground terminal which concerns on Embodiment 1 of this invention The perspective view which shows the operation | movement which crimps | bonds a ground terminal to the terminal of a covered electric wire Cross section of wire barrel before crimping Sectional view of the wire barrel crimped to the core wire Partial cutaway side view when crimping is complete Exploded view of ground terminal according to Embodiment 2

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the earthing terminal 10 which is an example of a bolt fastening terminal is illustrated.
As shown in FIG. 2, the ground terminal 10 of the present embodiment includes an open barrel type wire barrel 15 and an insulation barrel 16 that are connected to each other through a neck portion 14 behind a connection portion 12 in which a bolt hole 13 is opened. The terminal body 11 is provided in series, and the reinforcing plate 20 is stacked over the connecting portion 12, the neck portion 14, and the bottom of the wire barrel 15 in the terminal body 11.

The terminal body 11 and the reinforcing plate 20 are connected and formed integrally, and while the hoop material is sent through the press processing line, cutting, bending processing, etc. are sequentially performed to form the ground terminal 10 having a predetermined shape. It has come to be.
The hoop material is made of a metal plate such as a copper alloy having excellent conductivity, and has a relatively thin plate thickness of 0.4 mm.

In the cutting process, as shown in the lower side of FIG. 1, the terminal body 11 is formed on one side edge of the carrier 28 in a posture perpendicular to the carrier 28, and the reinforcing plates 20 are arranged in a row at the tip of the terminal body 11. It is formed to be connected.
As described above, the connection portion 12 of the terminal body 11 is formed in a ring shape having a substantially rectangular shape with a round bolt hole 13 at the center and a rounded corner. On one side (the lower side in FIG. 1) in the width direction (the direction perpendicular to the axial direction of the terminal body 11) at the rear edge of the connection portion 12, a neck portion 14 that is a connection portion with the barrels 15 and 16 extends. Is formed. The neck 14 before bending has a shape that gradually becomes narrower toward the rear.

  A wire barrel 15 and an insulation barrel 16 are formed behind the neck portion 14 with a gap therebetween. The wire barrel 15 is caulked to the end of the core wire 31 in the covered electric wire 30, and before bending, a pair of barrel pieces 15 </ b> A that are short and wide are extended from both side edges of the bottom plate 15 </ b> B. The insulation barrel 16 is caulked to the end of the insulation coating 32 in the covered electric wire 30, and is tall and narrow from both side edges of the bottom plate 16 </ b> B extended from the wire barrel 15 side before bending. A pair of barrel pieces 16A is formed in a protruding manner. The rear edge of the bottom plate 16 </ b> B in the insulation barrel 16 is connected to the carrier 28.

  A reinforcing plate 20 is formed on the front edge side of the connection portion 12 in the terminal body 11 via a connecting portion 25 that can be bent. The reinforcing plate 20 has a shape in which a tongue piece portion 23 that overlaps the bottom plate 15B of the wire barrel 15 extends from the main body portion 21 that overlaps from the connection portion 12 to the neck portion 14, and the connection portion described above. The reinforcing plate 20 is rotated 180 degrees around the connecting portion 25, and is connected to the neck portion 14 and the wire barrel 15 in the developed shape of the terminal body 11. Are folded over the bottom plate 15B.

More specifically, the portion of the main body 21 of the reinforcing plate 20 that overlaps the connection portion 12 has an outer shape that matches the connection portion 12 and a center hole 22 that matches the bolt hole 13. The portion of the main body portion 21 that overlaps the neck portion 14 is formed to be a little narrower than the neck portion 14 in the unfolded shape so that a side wall having a uniform upper edge is formed by bending together with the neck portion 14 (see FIG. 2). ing.
The tongue piece 23 is also bent together with the wire barrel 15, and, as shown in FIG. 3, the bottom plate 15B of the wire barrel 15 in the unfolded shape so as to be in close contact with the entire upper surface of the bottom plate 15B bent into an arc shape. It is formed a little narrower than. Further, when the reinforcing plate 20 is properly folded, the extending end of the tongue piece 23 is set to protrude rearward by a predetermined dimension from the rear end of the barrel piece 15A in the wire barrel 15.

The ground terminal 10 is formed as follows. As shown in the lower side of FIG. 1, the hoop material is cut to form a terminal body 11 and a reinforcing plate 20 that are in a developed shape, and are formed in a form that is connected in a horizontal row, and then the wire barrel 15 and the insulation. The tip of each barrel piece 15A, 16A of the adjustment barrel 16 is struck to form a tapered shape.
After that, the hoop material is sequentially bent while being conveyed in the direction indicated by the arrow in FIG. 1. First, the reinforcing plate 20 is rotated 180 degrees around the connecting portion 25, and the terminal body 11. Are folded over the connecting portion 12, the neck portion 14 and the bottom plate 15B of the wire barrel 15, and thereafter bent from the neck portion 14 to both barrels 15 and 16 in a substantially U-shaped cross section with an obliquely upward opening. (See the upper side of FIG. 1). Finally, the rear edge of the insulation barrel 16 in the terminal body 11 is cut off from the carrier 28, whereby the ground terminal 10 as shown in FIG.

  At this time, the ground terminal 10 has a double plate structure in which the main body portion 21 of the reinforcing plate 20 is in close contact and overlapped from the connection portion 12 of the terminal main body 11 to the upper surface including the inner surface of the side wall of the neck portion 14. Further, in the wire barrel 15, as shown in FIG. 3, the tongue piece portion 23 is in close contact with the upper surface of the bottom plate 15B bent into an arc shape. Further, as shown in FIG. 5, the extending end of the tongue piece 23 projects from the rear end of the wire barrel 15 by a predetermined dimension.

In other words, for the wire barrel 15, the bent bottom plate 15B has a double plate structure, and only the barrel pieces 15A have a single plate structure.
The insulation barrel 16 has a single plate structure from the bent bottom plate 16B to both barrel pieces 16A. As a result, the bottom of the insulation barrel 16 has a form that is lowered by one step compared to the bottom of the wire barrel 15.

The ground terminal 10 having such a shape is crimped and crimped to the covered electric wire 30. For this purpose, as shown in FIG. 2, the end of the insulation coating 32 of the covered electric wire 30 is peeled off, and the end of the core wire 31 is exposed over a predetermined length.
From this state, a crimping operation is performed using a crimping apparatus. The crimping device is provided with an anvil and a crimper, and the terminal of the covered electric wire 30 processed as described above is set on the barrels 15 and 16 of the ground terminal 10 placed on the anvil. Specifically, as shown in FIG. 2, the end of the covered wire 30 is placed over the bottom plates 15 </ b> B and 16 </ b> B of both barrels 15, 16 in a form with a little back, and then pushed forward, as shown in FIG. 5. Thus, when the end surface of the insulating coating 32 hits the extended end of the tongue piece 23 of the reinforcing plate 20, the pushing is stopped, and the end of the core wire 31 has a double plate structure over almost the entire length. The end of the insulation coating 32 is placed on the bottom of the barrel 15 while the end of the insulation coating 32 is placed on the bottom of the single plate insulation barrel 16.

Subsequently, as the crimper descends, both barrels 15 and 16 are clamped between the anvil, the wire barrel 15 is crimped to the end of the core wire 31, and the insulation barrel 16 is crimped to the end of the insulating coating 32. Specifically, the wire barrel 15 is called a heart shape and is caulked in the form of biting into the core wire 31 while abutting the protruding ends of both barrel pieces 15A as shown in FIG. Here, since the barrel piece 15A has a comparatively thin plate thickness of 0.4 mm, for example, a thin wire having an electric wire size of 2 sq (cross-sectional area: mm 2) or less can be well bitten into the core wire 31. .
On the other hand, the insulation barrel 16 is caulked to the end of the insulation coating 32 so that both barrel pieces 16A are wound in an overlapping manner.

  The ground terminal 10 thus crimped to the end of the covered electric wire 30 is applied to a predetermined portion of the body of the automobile and is screwed into a nut provided on the body side through a bolt through the aligned bolt hole 13 and the center hole 22. Then, the connecting portion 12 is fixed together with the reinforcing plate 20 by tightening, or after passing through the bolt hole 13 and the center hole 22 aligned with the stud bolt raised from the body, the nut is screwed into the stud bolt. By tightening, the connection portion 12 is also fixed to the body together with the reinforcing plate 20, and the ground of the covered electric wire 30 is thereby taken.

  As described above, according to the ground terminal 10 of the present embodiment, the connection terminal 12, the neck part 14 and the bottom part of the wire barrel 15 in the terminal main body 11 are thickened, thereby resisting bending or the like in the part. While the strength is secured, the barrel piece 15A of the wire barrel 15 is relatively thin, so that it can easily bite into the core wire 31 of the covered electric wire 30 when crimped, and the crimping force on the core wire 31 can be increased. . In particular, it is useful for the covered electric wire 30 having a small wire diameter.

Since the reinforcing plate 20 is formed integrally with the terminal body 11, compared to a case where the reinforcing plate 20 is provided separately, component management is easy and assembly can be performed accurately and easily.
Moreover, since the terminal body 11 (connecting portion 12, neck portion 14 and barrels 15 and 16) and the reinforcing plate 20 are arranged in a horizontal row, the developed shape to be cut from the material is formed by pressing from a hoop material. When it does, it will be excellent in material removal.

The tongue piece 23 of the reinforcing plate 20 does not reach the bottom plate 16B of the insulation barrel 16 when folded on the terminal body 11, but is held at a position protruding slightly rearward from the bottom plate 15B of the wire barrel 15. ing.
Before the crimping and crimping operation, the ends of the coated wire 30 are fitted and set in the barrels 15 and 16, and the end surface of the insulating coating 32 is applied to the extending end of the tongue piece 23 of the reinforcing plate 20, so that the axial direction That is, the ends of the core wire 31 and the insulation coating 32 can be easily and accurately fitted to the wire barrel 15 and the insulation barrel 16 respectively.
In addition, after the both barrels 15 and 16 are crimped, the bottom portion of the insulation barrel 16 in which the insulation coating 32 having a large diameter is caulked is lowered one step. For example, the core wire 31 is bent so that the core wire is not easily broken.

<Embodiment 2>
FIG. 6 shows Embodiment 2 of the present invention. The ground terminal 10A of the second embodiment is the same in the developed shape of the terminal body 11 and the reinforcing plate 20 as compared to that of the first embodiment, and the two are integrally connected. The connected arrangement is different.
In other words, the reinforcing plate 20 is connected to the left side edge of the connection portion 12 of the terminal body 11 through a foldable connecting portion 25A, and is symmetrical with the terminal body 11 side about the connecting portion 25A. It is formed in a manner. The reinforcing plate 20 is rotated 180 degrees around the connecting portion 25 </ b> A, and is folded over from the connecting portion 12 in the developed shape of the terminal body 11 to the neck portion 14 and the bottom plate 15 </ b> B of the wire barrel 15.

The shape of the ground terminal 10A as the final product is the same as that of the ground terminal 10 of the first embodiment, and is crimped to the end of the covered electric wire 30 through the same procedure.
In the ground terminal 10 </ b> A of the second embodiment, the developed shape cut from the material is a shape in which the reinforcing plates 20 are connected side by side on the side of the connection portion 12 of the terminal main body 11, so that In comparison, a number of advantages can be obtained when performing the operation of folding the reinforcing plate 20 on a predetermined portion of the terminal body 11. For example, since folding is performed from the side, the moment required for the bending work can be kept small, and the space required for the work can be reduced. Furthermore, it is difficult for the reinforcing plate to twist during the bending process.
In addition, it is possible to arrange and arrange while changing the direction appropriately according to the developed shape, so when taking a form formed by cutting a material consisting of a single plate, it is excellent in material removal Become.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) The position of the extending end of the tongue piece of the reinforcing plate may be up to the middle of the wire barrel or may extend to the insulation barrel.
(2) The reinforcing plate may be formed separately from the terminal body and assembled later.
(3) The reinforcing plate may overlap only the neck portion of the terminal body and the wire barrel. In this case, it does not matter whether the reinforcing plate is formed integrally with the terminal body side or formed separately.

(4) The present invention can also be applied to other types of bolt fastening terminals such as LA terminals.
(5) Further, the present invention can be applied to all crimp terminals having a barrel crimped to an electric wire behind a connection portion connected to a counterpart conductive member. In this case, depending on the shape of the connecting portion, the reinforcing plate overlaps only over the neck and the wire barrel, and may be either integral or separate.
(6) As a barrel, only a wire barrel is provided, and it is applicable to a bolt fastening terminal of a type not provided with an insulation barrel, and further a crimp terminal.

DESCRIPTION OF SYMBOLS 10,10A ... Earth terminal 11 ... Terminal body 12 ... Connection part 13 ... Bolt hole 14 ... Neck part 15 ... Wire barrel 15A ... Barrel piece 15B ... Bottom plate 16 ... Insulation barrel 16A ... Barrel piece 16B ... Bottom plate 20 ... Reinforcement plate 21 ... Main body part 22 ... Center hole 23 ... Tongue piece part 25, 25A ... Connection part 30 ... Covered wire 31 ... Core wire 32 ... Insulation coating

Claims (7)

In the crimp terminal provided with a wire barrel that is crimped to the end of the core wire in the electric wire through the neck behind the connection part with the conductive member,
A conductive reinforcing plate is provided to be overlapped from the neck to the bottom of the wire barrel;
A side wall is formed in the neck part, and a side wall is also formed in a portion overlapping the neck part of the reinforcing plate, thereby forming a double plate structure by the side wall of the neck part and the side wall of the reinforcing plate,
A crimp terminal having a structure in which the wire barrel is caulked and crimped to the core wire of the electric wire together with the reinforcing plate.   The crimp terminal according to claim 1, wherein the reinforcing plate is integrally formed to be foldable via a connecting portion. A flat plate-like connecting portion having a bolt hole opened, a neck portion extending from a part of the peripheral edge of the connecting portion, and a terminal portion of a core wire in the electric wire are further extended backward from the neck portion to be crimped. A wire barrel and
A conductive reinforcing plate is provided over the connecting portion, the neck and the bottom of the wire barrel;
A side wall is formed in the neck part, and a side wall is also formed in a portion overlapping the neck part of the reinforcing plate, thereby forming a double plate structure by the side wall of the neck part and the side wall of the reinforcing plate,
A bolt fastening terminal, wherein the wire barrel is caulked and crimped to a core wire of the electric wire in a state where the reinforcing plate is overlaid.   The bolt fastening terminal according to claim 3, wherein the reinforcing plate is integrally formed so as to be foldable via a connecting portion.   The bolt fastening terminal according to claim 4, wherein the reinforcing plate is provided so as to be connected to an opposite side of the neck of the connecting portion with respect to the center.   The bolt fastening terminal according to claim 4, wherein the reinforcing plate is connected and provided at a position at an angular interval of approximately 90 degrees from the neck at the periphery of the connecting portion.   An insulation barrel is provided at the rear of the wire barrel so that the end of the insulation coating of the electric wire is crimped, while the extending end of the reinforcing plate does not reach the bottom of the insulation barrel. The bolted terminal according to any one of claims 3 to 6, wherein the bolted terminal remains at the bottom of the wire barrel.

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