JPH09330748A - Wire crimping structure and wire crimping method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a trouble such as the breakage of an insulating film by the tip of a core wire part by regulating the tip position of the core wire part of a wire so as to be within the area of a bell mouth to perform the caulking work of a pair of claw pieces. SOLUTION: A crimp terminal 30 is inserted between a pair of claw pieces 12 in the state set on the anvil 16 of a caulking press device so as to be vertically laid along a bottom wall part 11 in the state where the core wire parts 18a, 19a of a plurality of wires 18, 19 are vertically superposed. The tip position of the core wire part 18a is regulated so that the tip part 18b of the core wire part 18a of the wire 18 put on the upper side between the claw piece 12 is situated within the area of a bell mouth. A shear blade 24 has a core wire positioning part 24a making contact with the tip of the core wire part 19a of the wire 19 situated on the lower side between the claw pieces 12 to regulate the tip position. A crimper 21 is lowered to caulk the claw pieces 12 onto the core wires, and a cutting punch is also lowered in interlocking with the crimper 21 to cut the terminal finishing the caulking from a connecting part 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crimp terminal having a substantially U-shaped cross-sectional structure formed by a bottom wall portion and a pair of caulking claw pieces which are erected from both side edges of the bottom wall portion. The present invention relates to an electric wire crimping structure and an electric wire crimping method for crimping and connecting core wires of one or a plurality of electric wires.

[0002]

2. Description of the Related Art In wiring processing of electric systems such as vehicles,
A method of crimp connection using a crimp terminal formed by press molding of a metal plate is often used for branch connection of wiring and wiring connection to a connector terminal.

FIG. 9 shows an example of a conventional wire crimping structure using a crimp terminal made of a metal plate as described above. The crimp terminal 1 shown here is the actual open flat 5-53133.
In the state disclosed in Japanese Patent Laid-Open Publication No. 6-28, the claw pieces 6 and 6 are added in a state where the core wire portions 2a, 3a and 4a of the plurality of electric wires 2, 3 and 4 are inserted between the pair of claw pieces 6 and 6. Tightened to form a branch circuit in which these electric wires 2, 3 and 4 are pressure-bonded to each other.

In the crimp terminal 1, a straightening wall 8 for contacting the tips of the core wires 3a, 4a of the electric wires 3, 4 inserted between the claw pieces 6, 6 is provided at the end of the claw piece 6, The straightening wall 8 prevents the tip portions of the core wire portions 3 a and 4 a from protruding from the end portion of the crimp terminal 1. Therefore, although the insulation coating by taping or the like is applied later on the crimp connection portion formed by the crimp terminal 1, the core wire portions 3a, 4a may pop out from the end portion of the crimp terminal 1 by the correction wall 8. Since it is prevented, the protruding core wire portions 3a, 4
The occurrence of the inconvenience that the insulating coating is breached by a is prevented.

However, with the structure of the crimp terminal 1 described above, it is difficult to increase the fixing strength in the axial direction with respect to the core portions 2a, 3a, 4a, and when a large tension is applied to the electric wires 2, 3, 4, the core wire is The parts 2a, 3a, 4a might fall off from the crimp terminal 1. Further, since the end portion of the crimp terminal 1 is covered with the correction wall 8, there is a problem that the crimped state in the crimp terminal 1 cannot be visually recognized.

10 to 13 show a crimp terminal 1 for improving the axial fixing strength with respect to the core wire portion which is crimp-connected.
0 and an electric wire crimping structure using the crimp terminal 10. The crimp terminal 10 crimps and connects a plurality of electric wires to each other, and is integrally formed by press molding a metal plate. Specifically, as shown in FIG. 10, the crimp terminal 10 includes a bottom wall portion 11 and a pair of caulking claw pieces 12 and 12 raised from both side edges of the bottom wall portion 11, and is substantially U-shaped.
It has a V-shaped cross-section structure. Further, the crimp terminal 10 is formed by the connecting portion 14 in a continuous state in which a plurality of them are connected.

As shown in FIG. 11, the crimp terminal 10 is set on the anvil 16 of the press device for caulking, and first, a plurality of (two in this example) electric wires 1 are provided.
The core wire portions 18a and 19a of 8 and 19 are vertically stacked and inserted between the pair of claw pieces 12 and 12 so as to be vertically attached to the bottom wall portion 11. Next, the crimper 21 of the pressing device is lowered to crimp the pair of claw pieces 12, 12 onto the core wire.

When the crimper 21 descends, the cutting punch 22 descends in conjunction with the crimper 21 to remove the nail piece 12.
The crimp terminal 10, which has been crimped, is separated from the connecting portion 14. When the crimp terminal 10 is set on the anvil 16, the connecting portion 14 is used for positioning the crimp terminal 10 with respect to the crimper 21 by abutting the shear blade 24 provided adjacent to the anvil 16. Further, the shear blade 24 has a core wire portion 19a of the electric wire 19 positioned on the lower side between the pair of claw pieces 12, 12.
Is provided with a core wire positioning portion 24a that abuts on the tip end of the core wire portion 19a to regulate the tip end position of the core wire portion 19a.

The width of the crimper 21 is set to be slightly smaller than the width of the claw piece 12. Further, when inserting the core wire portion 18a of the electric wire 18 located at a higher position between the pair of claw pieces 12, 12, the tip of the core wire portion 18a is slightly protruded from the edge of the claw piece 12. Be taken into consideration. Therefore, during the crimping process of the pair of claw pieces 12 and 12, as shown in FIG. 12, a range protruding from the crimper 21 of the claw piece 12 (a range indicated by an arrow (a) in FIG. 12) warps, Bell mouths 23 are formed at both ends of the crimp terminal 10 to exert a so-called wedge effect, which causes the inner core portions 18 a and 19 a to be constricted.

The bell mouth 23 has core wires 18a, 1
The fixing strength in the axial direction is increased with respect to 9a to prevent the core portions 18a and 19a from coming off. Further, since the tip of the crimped core wire portion is projected and exposed from the bell mouth 23, the crimped state can be easily visually recognized. As shown in FIG. 13, the insulating coating 26 is mounted on the wire crimping portion that has been subjected to the crimping process.

[0011]

However, in the above-described conventional crimp terminal 10, the area of the bell mouth 23 is small, and therefore, the tip end position of the core wire portion 18a of the electric wire 18 superposed on the bell mouth 23 is small. There is a problem that the inconvenience that the tip end of the core wire portion 18a protruding from the bell mouth 23 breaks through the insulating coating 26 as shown in FIG.

An object of the present invention is to solve the above-mentioned problems. The fixing strength in the axial direction with respect to the core wire portion to be crimped and connected is high, and the effect of preventing the core wire portion from coming off from the crimp terminal can be enhanced, and at the same time, The crimped state inside the crimp terminal can be easily viewed, and the tip of the core wire portion is prevented from jumping out from the end portion of the crimp terminal, which causes the inconvenience that the insulating coating is pierced by the tip of the core wire portion. An object of the present invention is to provide an electric wire crimping structure and an electric wire crimping method capable of preventing the above problems.

[0013]

The wire crimping structure according to the present invention for achieving the above object comprises a bottom wall portion and a pair of caulking claw pieces raised from both side edges of the bottom wall portion. By using a crimping terminal having a substantially U-shaped cross-sectional structure by and, after inserting the core wire portion of the electric wire vertically between the pair of claw pieces, the pair of claw pieces is inserted. Crimping on the core wire, in the step of crimping the claw piece, a bell mouth for constricting the core wire portion is formed at the end of the crimp terminal,
In an electric wire crimping structure for preventing crimping of the core wire portion at the same time as crimping connection to the core wire portion, the tip of the core wire portion of the electric wire to be inserted between the pair of claw pieces is located in the region of the bell mouth. It is characterized in that the tip end position of the core wire portion of the electric wire inserted between the pair of claw pieces is regulated and the caulking work of the pair of claw pieces is performed.

In addition to the above-mentioned structure, the structure of the electric wire crimping structure according to the present invention is such that the core wire portions of a plurality of electric wires are vertically stacked between a pair of claw pieces of the crimp terminal, When crimping and connecting the electric wires by crimping the claw pieces, at least the tip of the core wire portion of the electric wire that is superposed between the pair of claw pieces is located in the region of the bell mouth, It is characterized in that the tip end position of the core wire portion of the electric wire inserted between the pair of claw pieces is regulated to perform the caulking work of the pair of claw pieces.

Furthermore, in addition to the above-mentioned structure, the structure of the electric wire crimping structure according to the present invention is such that the position of the tip of the core wire portion of the electric wire within the region of the bell mouth is easily regulated. It is characterized in that the size of the mouse area is set.

In addition to the above structure, the structure of the electric wire crimping structure according to the present invention includes, in the region of the bell mouth,
It is characterized in that a notched portion is provided so that the tip of the crimped core wire portion can be visually recognized.

Further, in addition to the above-mentioned structure, the structure of the electric wire crimping structure according to the present invention further includes an edge of the claw piece so that the width of the claw piece gradually increases as it approaches the bottom wall side. By forming the portion in a tapered shape, a cutout portion in the region of the bell mouth is provided.

Further, the wire crimping method according to the present invention is crimping which has a substantially U-shaped transverse sectional structure by the bottom wall portion and a pair of caulking claw pieces which are erected from both side edges of the bottom wall portion. Using terminals, insert the core of the wire between the pair of claw pieces so that the core part of the wire is vertically attached to the bottom wall, and then crimp the pair of claw pieces onto the core wire and crimp the claw pieces. In the step, in a wire crimping method in which a bell mouth for constricting the core wire portion is formed at an end portion of the crimp terminal, and at the same time crimping connection to the core wire portion is performed to prevent the core wire portion from coming off, between the pair of claw pieces. The tip of the core portion of the electric wire to be inserted into, so as to be located in the region of the bell mouth, by regulating the tip position of the core portion of the electric wire to be inserted between the pair of claw pieces,
It is characterized in that the pair of claw pieces are caulked.

With the above construction, in the step of crimping the claw piece, a bell mouth for constricting the core wire portion is formed at the end portion of the crimp terminal, and the bell mouth is used in the axial direction with respect to the core wire portion crimped and connected. The fixing strength of is increased.
Further, since the tip of the core wire portion connected by crimping is exposed in the notch formed in the bell mouth, the crimping state in the crimping terminal can be easily visually recognized.

Further, since the position of the tip of the core wire portion to be inserted into the crimp terminal is regulated so that the tip of the core wire portion connected by crimping fits within the range of the bell mouth, the tip of the core wire portion connected by crimping is regulated. Can be reliably prevented from jumping out from the end of the crimp terminal. In addition, if the size of the bell mouth region is set to a large size so that the work of regulating the position of the tip of the core part of the electric wire in the region of the bell mouth is easy, the above-mentioned protrusion of the tip of the core part will come out. The prevention effect can be secured more reliably and easily.

Further, by forming the edge portion of the claw piece in a tapered shape so that the width of the claw piece gradually increases as the width approaches the bottom wall side, a cutout portion in the region of the bell mouth is provided. With this configuration, the punching process does not increase due to the provision of the notch, and the manufacturing process of the crimp terminal can be simplified.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of an electric wire crimping structure and an electric wire crimping method according to the present invention will be described in detail below with reference to the drawings. 1 to 8 show an embodiment of an electric wire crimping structure and an electric wire crimping method according to the present invention. FIG. 1 is a plan view of a crimp terminal applied to the present invention, and FIG.
Is a side view showing the crimping process of the crimp terminal, and FIG. 3 is B of FIG.
-B is a sectional view taken along the line B, FIG. 4 is a side view showing an electric wire crimping structure using crimp terminals, FIG. 5 is a view taken in the direction of arrow C in FIG. 4, and FIG. FIG. 7 is a vertical cross-sectional view showing a state in which the wire crimping portion is subjected to insulation treatment, and FIG. 8 is an enlarged view of portion D of FIG.

The crimp terminal 30 is for crimping and connecting a plurality of electric wires to each other, and is integrally formed by press molding a metal plate. Specifically, the crimp terminal 30 has the structure shown in FIGS.
As shown in FIG. 5, the bottom wall portion 11 and the pair of caulking claw pieces 12, 12 raised from both side edges of the bottom wall portion 11 form a substantially U-shaped cross-sectional structure. Also, crimp terminal 3
A plurality of 0s are formed by the connecting portion 14 in a continuous state.

In this crimp terminal 30, the bell mouths 23 for constricting the core wire portion to be crimped are formed on both ends of the crimp terminal 30 by the crimping process shown in FIG. The tip of the bell mouth 23
The region L ₁ of the bell mouth is set to be large in size so that the work of restricting the position within the region is easy. For example, in the conventional crimp terminal 10 shown in FIG. 10, the region L ₂ of the bell mouth 23 is normally set to about 0.5 mm.
₁ is set to about 2 to 3 mm.

Further, both edge portions 32 of each claw piece 12 are formed in a tapered shape so that the width of the claw piece 12 gradually increases as it approaches the bottom wall portion 11 side. When the claw piece 12 is subjected to the crimping process, due to the tapered edge portion 32, as shown in FIG. 5, there is formed a notch portion 33 in which the tip of the crimped core wire portion can be visually recognized. It is formed in the area of the bell mouth 23.

As shown in FIG. 2, the above crimp terminals 30 are set on the anvil 16 of the press device for caulking, and firstly, a plurality of (two in this example) electric wires 1 are provided.
The core wire portions 18a and 19a of 8 and 19 are vertically stacked and inserted between the pair of claw pieces 12 and 12 so as to be vertically attached to the bottom wall portion 11. At that time, the pair of claw pieces 12
The tip 1 of the core portion 18a of the electric wire 18 that is superposed between the two
The tip position of the core wire portion 18a is regulated so that 8b is located within the area of the bell mouth 23. The position of the tip 18b of the core wire portion 18a is preferably regulated as shown in FIG. 5 by setting the length S of the core wire portion 18a exposed in the notch 33 formed in the region of the bell mouth 23 to S = 1 mm. The following should be set.

Next, the crimper 21 of the pressing device is lowered, and the pair of claw pieces 12, 12 are crimped on the core wire. When the crimper 21 descends, the cutting punch descends in conjunction with the crimper 21 to separate the crimp terminal 30 from which the crimping of the claw piece 12 is completed from the connecting portion 14. When the crimp terminal 30 is set on the anvil 16, the connecting portion 14 is used to position the crimp terminal 30 with respect to the crimper 21 by abutting the shear blade 24 provided adjacent to the anvil 16. Further, the shear blade 24 is provided with a core wire positioning portion 24a that abuts on the tip of the core wire portion 19a of the electric wire 19 located at a lower position between the pair of claw pieces 12, 12 to regulate the tip end position of the core wire portion 19a. Equipped.

The width of the crimper 21 is set to be slightly smaller than the width of the upper end of the claw piece 12. Therefore, during the crimping process of the pair of claw pieces 12 and 12, as shown in FIG. 4, the range of the claw pieces 12 protruding from the crimper 21 (see FIG. 4).
A bell mouth 23 is formed at both ends of the crimp terminal 30 to warp the core wires 18a and 19a by causing a warp in a range indicated by an arrow (B).

On the wire crimping part that has been crimped,
As shown in FIG. 7, the insulating coating 26 is attached. In addition,
As a supplementary explanation, as shown in FIG. 6, a chamfer c is applied to the edge portion 32 that is outwardly warped by the press molding with the crimper 21 so that the corner does not hit the insulating coating 26.

In the electric wire crimping structure and the electric wire crimping method using the crimping terminal 30 described above, in the step of crimping the claw piece 12, the bell mouths 23 for constricting the core wire portions 18a, 19a to be crimped are provided at both ends of the crimping terminal 30. And the core wire portion 18a that is crimped and connected by the bell mouth 23,
The fixing strength in the axial direction with respect to 19a is enhanced, and the effect of preventing the core wire portions 18a and 19a from coming off from the crimp terminal 30 can be enhanced.

Further, the core wire portions 18a and 19a connected by crimping
Since the tip of the is exposed to the notch 33 formed in the bell mouth 23, the crimped state in the crimp terminal 30 can be easily viewed.

Further, the crimp terminal 30 is so placed that the tip of the crimp-connected core wire portion falls within the area of the bell mouth 23.
Since the position of the tip end of the core wire portion 18a to be inserted into the wire is regulated, it is possible to reliably prevent the tip end of the core wire portion crimped and connected from protruding from the end portion of the crimp terminal 30, as shown in FIG. The insulation coating 26 covering the portion is the core wire portion 1
It is possible to prevent inconveniences such as being pierced by the tip 18b of the 8a.

In addition, in the case of this embodiment, the size of the bell mouth 23 is increased to such an extent that it is easy to position the tip of the core portion of the electric wire within the area of the bell mouth 23. Since it is set, the effect of preventing the tip of the core wire portion from popping out can be more reliably and easily ensured.

Further, the width of the claw piece 12 gradually increases as the width of the claw piece 12 approaches the bottom wall portion 11 side.
The second edge portion 32 is formed in a tapered shape, and the tapered edge portion 32 forms the cutout portion 33 in the region of the bell mouth 23. Therefore, the punching step for mounting the cutout portion 33 is performed. Crimp terminal 3 without increasing
The manufacturing process of 0 can be simplified.

In the above embodiment, the wires are crimped together. However, the application example of the wire crimping structure and the wire crimping method of the present invention is not limited to the above embodiment. It can also be applied to the case where the wiring is crimped to the connection terminal of the connector. Further, the number of wires connected to each other is not limited to that in the above-described embodiment.

[0036]

According to the electric wire crimping structure and the electric wire crimping method of the present invention, in the step of crimping the claw pieces of the crimp terminal, a bell mouth for constricting the core wire portion is formed at the end of the crimp terminal, and the bell mouth is formed. As a result, the fixing strength in the axial direction with respect to the core wire portion connected by crimping is enhanced, and the effect of preventing the core wire portion from coming off from the crimp terminal can be enhanced. Further, since the tip of the core wire portion connected by crimping is exposed in the notch formed in the bell mouth, the crimping state in the crimping terminal can be easily visually recognized. Further, since the tip position of the core wire portion to be inserted into the crimp terminal is regulated so that the tip of the crimp-connected core wire portion falls within the range of the bell mouth, the tip of the crimp-connected core wire portion is attached to the crimp terminal. It is possible to reliably prevent the wires from jumping out from the end portions, and it is possible to prevent the occurrence of inconveniences such as the insulation coating covering the wire crimping portions being pierced by the tip of the core wire portion. Then, if the size of the region of the bell mouth is set to a large size so that the work of regulating the position of the tip of the core part of the electric wire in the region of the bell mouth is easy, the above-mentioned protrusion of the tip of the core wire part The preventive effect can be secured more reliably and easily.
Further, by forming the edge portion of the claw piece in a tapered shape so that the width of the claw piece gradually increases toward the bottom wall side, a cutout portion in the region of the bell mouth is provided. Then, the punching process does not increase due to the provision of the cutout portion, and the manufacturing process of the crimp terminal can be simplified.

[Brief description of drawings]

FIG. 1 is a plan view of a crimp terminal according to an embodiment of the present invention.

FIG. 2 is a side view showing a crimping step of the crimp terminal according to the embodiment of the present invention.

3 is a cross-sectional view taken along the line BB of FIG.

FIG. 4 is a side view showing an electric wire crimping structure using a crimp terminal according to an embodiment of the present invention.

5 is a view on arrow C of FIG. 4. FIG.

FIG. 6 is an enlarged cross-sectional view showing a state of an edge portion of a claw piece in the crimp terminal according to the embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view showing a state in which the electric wire crimping portion according to the electric wire crimping structure of the embodiment of the present invention is subjected to an insulation treatment.

FIG. 8 is an enlarged view of part D in FIG.

FIG. 9 is a perspective view showing a conventional wire crimping structure.

FIG. 10 is a top view of a crimp terminal used in another conventional wire crimping structure.

FIG. 11 is an explanatory diagram of a crimping process for the crimp terminal shown in FIG.

12 is a side view showing an electric wire crimping structure using the crimp terminal shown in FIG.

13 is a vertical cross-sectional view showing a state in which an electric wire crimping portion by the crimping terminal shown in FIG. 10 is subjected to an insulation treatment.

FIG. 14 is an enlarged view of a portion A of the crimp terminal in FIG.

[Explanation of symbols]

 11 Bottom Wall Part 12 Claw Piece 14 Connection Part 16 Anvil 18, 19 Electric Wire 18a, 19a Core Wire Part 18b Tip 23 Bellmouth 24 Shear Blade 30 Crimping Terminal 32 Edge Part 33 Notch Part

Claims (6)

[Claims] 1. A core wire portion of an electric wire using a crimp terminal having a substantially U-shaped cross-sectional structure composed of a bottom wall portion and a pair of caulking claw pieces which are erected from both side edges of the bottom wall portion. Is inserted between the pair of claw pieces so as to be vertically attached to the bottom wall portion, and then the pair of claw pieces is crimped onto a core wire, and in the crimping step of the claw piece, a bell that constricts the core wire portion is formed. A wire crimping structure in which a mouse is formed at an end of the crimp terminal to prevent the core wire from coming off at the same time as crimping the core wire, and a tip of the core wire of the wire to be inserted between the pair of claw pieces. However, the tip end position of the core wire portion of the electric wire inserted between the pair of claw pieces is regulated so as to be located in the region of the bell mouth, and the caulking work of the pair of claw pieces is performed. Wire crimping structure. 2. When the core portions of a plurality of electric wires are vertically stacked between a pair of claw pieces of the crimp terminal and the electric wires are crimp-connected by crimping the pair of claw pieces,
At least the tip position of the core portion of the electric wire inserted between the pair of pawl pieces so that the tip of the core portion of the electric wire that is superposed between the pair of pawl pieces is located in the region of the bell mouth. The wire crimping structure according to claim 1, wherein the wire crimping structure is carried out by crimping the pair of claw pieces. 3. The size of the bell mouth region is set to such an extent that it is easy to position the tip of the core portion of the electric wire within the bell mouth region. The electric wire crimping structure described in 2. 4. The electric wire crimping structure according to claim 1, wherein a cutout portion is provided in the region of the bell mouth so that a tip end of the crimped core wire portion can be visually recognized. 5. A cutout portion in the region of the bell mouth is provided by forming an edge portion of the claw piece in a tapered shape so that the width of the claw piece gradually increases as the width approaches the bottom wall side. The electric wire crimping structure according to claim 4, wherein 6. A core wire portion of an electric wire using a crimp terminal having a substantially U-shaped cross-sectional structure, which comprises a bottom wall portion and a pair of caulking claw pieces which are erected from both side edges of the bottom wall portion. Is inserted between the pair of claw pieces so as to be vertically attached to the bottom wall portion, and then the pair of claw pieces is caulked onto the core wire, and in the caulking step of the pawl piece, the core wire portion is constricted. In a wire crimping method in which a bell mouth is formed at an end of the crimp terminal to prevent crimping and connection of the core wire portion at the same time as the core wire portion, a core wire portion of the wire to be inserted between the pair of claw pieces is provided. The tip position of the core portion of the electric wire inserted between the pair of claw pieces is regulated so that the tip is located in the region of the bell mouth, and the caulking work of the pair of claw pieces is performed. The characteristic wire crimping method.