JP3224005B2 - Wire crimp terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire crimping terminal fixed to an electric wire used for, for example, wiring of an electric system of an automobile, and to easily and surely crimp electric wires having different wire diameters. .

[0002]

2. Description of the Related Art FIGS.
There are the following. That is, formed by a thin metal plate,
Electrical contact portion A, covering portion d of the pair of opposed conductor crimping pieces 2a and the wire D for the conductor portion d ₁ caulking the electric wire D
_The crimping portion B has a pair of wire crimping pieces 2b for caulking ₂ adjacent to the electric contact portion A.

An apparatus for crimping an electric wire D to an electric wire crimp terminal having the above structure is shown in FIG. 25, for example. The apparatus includes a male part 30 having an accommodation recess 30a on the upper surface for mounting a crimping part B of an electric wire crimping terminal and a pair of conductor crimping pieces 2a or a pair of wire crimping pieces 2b. insert the conductor portion d ₁ or coating unit d _2, after involving, formed in the work recess 31a is the lower surface of the substantially Futagoyama shape for bending opposite the pair of conductor crimping pieces 2a or wire crimping pieces 2b by pressure And a pressurizing female part 31 movably provided opposite to the male part 30.
And was formed from And, for example, the coating d
Conductor portion d ₁ of the electric wire D ₂ is peeled off, the male portion 30
As a result, a pair of conductor crimping pieces 2a of the crimping terminal are opposed to each other and bent by pressurization with the female mold portion 31 as shown in FIG.
3 and as shown in FIG.

[0004] Originally, it is optimal to caulk and fix an electric wire by using an electric wire crimping terminal and a dedicated device corresponding to a thick or thin wire. However, in view of the economics such as high production costs and material costs, conventional one-wire crimping terminals having the above structure shown in FIGS. 21 to 24 and one type of device shown in FIG. Wires D ₁ , D ₂ , and D ₃ of several sizes, such as a medium diameter and a small diameter, were crimped and fixed to the crimping portion B of the wire crimp terminal.

[0005] As basic characteristics of the quality determination of the crimp state of the crimp portion B of the wire crimping terminal according to the conductor portion d ₁ of the electric wire D, a contact resistance of the conductive portion d ₁ of the electric wire D by the pair of conductor crimping pieces 2a, conductor there is a wire clamping force of the conductor portion d ₁ by crimping portions 2a. When the length L of the pair of conductor crimping pieces 2a of the crimping portion B is made constant, as shown in FIG. 23 and FIG.
The crimping width C / W and the crimping height C / H between 2a are involved. When the crimping height C / H is set, the relationship between the contact resistance such as the initial resistance, the 150-hour resistance, and the 300-hour resistance and the wire fixing force (terminal crimp strength) as shown in the characteristic diagram of FIG. It is desirable to set in the contact resistance stable area (shaded area). In this characteristic diagram, the maximum value a _{1 of the} curve a representing the wire fixing force.
At this point, the wire D comes out on the side where the crimping height C / H is large, and breaks on the side where the crimping height C / H is small.

However, one type of wire crimp terminal is used in common, and the wires D ₁ , D ₂ ,
The D ₃ to caulking, when the crimp width C / W between the pair of conductor crimping pieces 2a of the wire crimp terminal is set to correspond to the wire D ₁ of the large diameter, the wire in the wire D ₃ of small diameter sizes Crimping width C / W is too wide when swaging. For this reason, the crimp height C / H
FIG than wire D ₁ of the large diameter size as shown in FIG. 24 2
Unless the wire D ₃ is set to the small diameter wire D ₃ as shown in FIG. 3 and is not lowered, the conductor d ₁ of the wire D is connected to the pair of conductor crimping pieces 2 a.
It was not possible to perform crimping with sufficient crimping strength. If the electric wire D ₃ a pair of conductor crimping pieces 2a of the crimp set the height C / H and wire diameter of the small diameter corresponding to the wire D ₁ of the large-diameter
If crimping is performed by using
₃ had a disadvantage that it was easy to escape. Therefore, conventionally,
Crimp height C / H ・ Crimp width C / W ratio = Crimp height C / H / (Crimp height C / H + Crimp width C / W) crimps wire D with conductor crimping piece 2a of around 40%. I was

[0007]

FIG. 21 and FIG.
FIG. 25 shows one kind of the conventional wire pressure contact terminal shown in FIG.
Several types of large diameter, medium diameter, small diameter, etc. using one type of device shown
Size wire D₁, D _Two, D_ThreeThe wire crimp terminal crimp
When caulking and fixing to part B, for example,
Low voltage / current resistance and terminal pressure with crimp height C / H for good characteristics
FIG. 27 is obtained as a characteristic diagram of the relationship with the strength of the wearing portion. This feature
The characteristic diagram is measured when the wire size is 1.25 mm in diameter.
The result. Then, as shown by the broken line d ',
The crimping strength of the conductor crimping piece 2a is 25.5 (Kgf)
When it increases from around to around 30.0 (Kgf),
The resistance value is indicated by a broken line e ', and the heat resistance time is indicated by 15
Low voltage current such as 0 o'clock resistance, 300 o's of broken line g '
Resistance (contact resistance) with 1.40 (mm) crimp height C / H
It stays level and is low until near. And the crimping height C / H is 1.
If it exceeds 40 (mm), the strength of the terminal crimping part remains strong and 3
From around 0.0 (Kgf), it shows a gradual increase
High, meanwhile initial resistance, 150 hours resistance, 300 hours
Although the resistance value increases, it is relatively slow, and
And good characteristics.

However, the crimping height of the conductor pressure contact piece 2a
When the C / H is set to correspond to the diameter of the wire D ₃ as shown in FIG. 23, the distal end of the pair of conductor crimping pieces 2a crimping portion B
Is pressed against the inner bottom surface of the conductor portion of the wire D ₃ at the conductor crimping portion 2a in a state of being divided into two chambers is crimped. In this crimped state, a characteristic diagram shown in FIG. 28 is obtained by measuring the relationship among the crimping height C / H, the low-voltage current resistance, and the terminal crimping portion strength when the wire size is 0.5 mm in diameter, for example. Similarly, in this characteristic diagram, the broken line e ″ is the initial resistance value, and the broken line f ″.
Is the resistance value at 150 hours, g ″ is the resistance value at 300 hours, and the broken line d ″ is the strength of the terminal crimping portion. And from this characteristic diagram, the crimping height
The initial resistance is 150 when C / H is around 1.15 (mm).
Hour resistance and 300 hour resistance are low. The terminal crimping part strength is 12.0 to 1 until the crimping height C / H is around 1.25.
It is a gradual increase in the range of 3.0 (Kgf) and reaches the highest value but is weak. Then, when the crimping height C / H exceeds about 1.25, the strength of the terminal crimping portion shows a tendency to decrease from a flat state. On the other hand, initial resistance, 150 hour resistance, 30
It can be seen that the contact resistance such as the 0 o'clock resistance value rapidly increases and is unstable in a high-temperature atmosphere.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional inconveniences and provides a simple crimping terminal for a wire having a different diameter such as a large diameter, a medium diameter, and a small diameter. The object is to provide an electric wire crimp terminal that is highly reliable as a product and economically excellent, for example, it is possible to share the crimp securely by using it, and the contact resistance is stable even in a high temperature atmosphere. .

[0010]

According to a first aspect of the present invention, there is provided an electric wire crimp terminal formed of a thin metal plate and provided with an electric contact portion and a crimp portion of a conductor having a folded double piece. For the pieces, a means was employed in which a plurality of types of conductor crimping pieces were formed, each having a different contact length in the wire insertion direction with respect to the wire in accordance with the wire diameter of the wire.

According to a second aspect of the present invention, the folded double piece has a contact length in the insertion direction of the electric wire corresponding to a medium or small-diameter electric wire, each of which is approximately two times the installation length of the conductor crimping piece. Means of being folded back to a width of ３, approximately 1/3.

According to a third aspect of the present invention, the folded double piece has a contact length corresponding to the medium diameter of the wire on one of the left and right side walls of the conductor crimping piece and the other corresponding to the small diameter of the wire. Means that a plurality of types are formed.

According to a fourth aspect of the present invention, the folded double piece corresponds to one of the right and left side walls of the conductor crimping piece corresponding to the medium diameter and the small diameter of the electric wire, and the other corresponds to the medium diameter of the electric wire. A means that a plurality of types are formed in the contact length is employed.

According to a fifth aspect of the present invention, the folded double piece has a contact corresponding to a medium diameter and a small diameter of one of the left and right opposite side walls of the conductor crimping piece, and a contact corresponding to the small diameter of the wire to the other. The means that a plurality of types are formed in the length is adopted.

According to a sixth aspect of the present invention, a plurality of types of the folded double piece are formed on at least one of the left and right side walls of the conductor crimping piece with a contact length corresponding to the middle diameter of the electric wire. Means were adopted.

According to the present invention, a plurality of types of the folded double piece are formed on at least one of left and right opposite side walls of the conductor crimping piece with a contact length corresponding to a small diameter of an electric wire. Means were adopted.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a first embodiment of the present invention. Reference numeral 1 denotes an electric wire crimp terminal.
Is formed of a thin metal plate, and comprises a crimp portion B provided with a pair of conductor crimping pieces 2a for caulking the conductor portion of the electric contact portion A and the electric wire D adjacent to the electric contact portion A. The structure is substantially the same as the conventional wire crimp terminal shown in FIG.

Reference numerals 3 and 3 'denote folded double pieces.
The heavy pieces 3, 3 'have different sizes, for example, large diameter, medium diameter, and small diameter.
Wire D₁, D_Two, D_ThreeCorresponding to the wire insertion direction
A plurality of types having different contact lengths are provided inside a pair of conductor crimping pieces 2a.
It is formed so that it can be folded back. For example, in this embodiment, FIG.
As shown in the figure, left and right opposite sides of a pair of conductor crimping pieces 2a
Medium diameter wire D on one of the walls_TwoWire D corresponding to_TwoInsert
The contact length in the incoming direction is the installation length L of the conductor crimping piece 2a.
Approximately 2/3 of the width, and on the other hand, a thin wire D _ThreeCorresponding to
Wire D_ThreeThe contact length in the insertion direction of the conductor crimping piece 2a
Of the conductor crimping piece 2a to the width of about 1/3 of the installation length L
Each is formed to be turnable inside.

[0019] 4 is a crimping piece portion for crimping an electric wire D ₁ of the large-diameter, substantially 2 to one of the both side walls the crimping piece portion 4 which influences opposing conductor crimping pieces 2a (left side in FIG. 1) / 3
Is formed so as to be able to be folded using the remaining portion of the side wall portion on one side where the folded double piece 3 having the width of 2 is set. Also 4 'is a crimping piece portion for crimping an electric wire D ₁ of the large-diameter cooperates with the crimping piece portion 4, the crimping pieces 4' other side walls of the left and right opposing conductor crimping portion 2a (The right side in FIG. 1) is formed so as to be able to be folded using the remaining portion of the other side wall portion on which the folded double piece 3 'having a width of about 1/3 is installed.

One embodiment of the present invention has the above configuration.
For example, in order to caulk and fix the conductors of the small-diameter wires D ₃ and D ₃ to the crimping portion B of the wire crimping terminal, a medium-diameter wire D ₂ is crimped to one of the left and right opposite side walls of the crimping portion B. approximately a 2 / 3L Ori returns double strip 3 forms a width, the other facing the Ori return double piece 3 'forming a width of approximately 1 / 3L for crimping the electric wire D ₃ of small diameter for By using a device as shown in FIG. 25 or the like and overlapping and crimping the inside of the crimping portion B, the small-diameter electric wires D ₃ and D ₃ are crimped (see FIG. 2).

The conductor portion of the wire D ₃ of the thus small-diameter, the conductor crimping crimping portion right opposite crimp the electric wire D ₂ one medium diameter of which is folded back to the inside of the side wall portion of the side wall portion of the B terminal Folded double piece 3 having a width of about 2 / 3L of the above, and a small-diameter electric wire D ₃ folded inside the other side wall of the left and right side walls.
The conductors of the small-diameter electric wires D ₃ and D ₃ are crimped to the crimping portion B via the folded double piece 3 ′ having a width of approximately 1 / 3L for crimping.

At this time, the wires D ₃ , D ₃ having a small diameter are
As described above, since the folded double pieces 3, 3 'are folded back inside the crimping portion B of the wire crimping terminal, there is no disadvantage that the crimping width C / W is widened as in the conventional case. Also, since the crimping strength of the crimping portion B does not need to be set for the small-diameter wires D ₃ , D ₃ , the crimping height C / H is different from the conventional case.
Of the pair of folded double pieces 3, 3 '
Is pressed against the inner surface of the bottom of the crimping portion B, and the inconvenience that the crimping portion B is divided into two chambers is eliminated (see FIG. 2). Then, as a result of measuring the relationship among the terminal crimping portion strength of the electric wire, the low voltage current resistance, and the crimping height, the characteristic diagram shown in FIG. 5 was obtained. In this characteristic diagram, the terminal crimping unit intensity of the electric wire D ₃ fold line d
And the initial resistance value as a low-voltage current resistance is represented by a broken line e and 1
The 50 o'clock resistance is represented by a broken line f, and the 300 o'clock resistance is represented by a broken line g. Also, from this characteristic diagram, the small-diameter electric wire D ₃
When the crimping height C / H is about 1.55 to 1.90, the terminal crimping part strength increases in the range of 23 to 35 (Kgf), the crimping strength is strong, and the contact resistance is 0.2 (mΩ). ) Low and good crimping height C / H. Then, the terminal crimping portion strength further increases and reaches the highest point exceeding 40 (kgf), but the low-voltage current resistance such as the initial resistance value, the resistance value at 150 hours, and the resistance value at 300 hours increases.

[0023] The conductor of the wire D ₂ having the middle diameter to crimping of the conductor crimping terminal shown in FIG. 1, the thin wire D ₃
As in the case of crimping, a folded double piece 3 'having a wire contact length of about 1 / 3L and a width of about 2 / 3L inside both side walls of a pair of conductor crimping pieces 2a opposed to each other. And the folded double piece 3 having the electric wire contact length is overlapped inside the conductor crimping piece 2a and folded. Then, as shown in FIG. 2, the right and left side walls of the crimping portion B are swaged to form a medium-diameter electric wire D.
₂ is crimped to the wire crimp terminal. As another method, FIG.
2/3 provided on one side wall of the crimping portion B as shown in FIG.
Only the folded double piece 3 having a width of L is folded inside one of the side walls, and the folded double piece 3 'having a width of about 1 / 3L is not folded and the entire conductor crimping piece 2a is entirely folded together with the other side wall. The medium-diameter electric wires D ₂ , D ₂ can also be crimped by bending in opposition.

In this way, even when crimping the medium-diameter electric wires D ₂ and D ₂ , the crimp width C / W of the crimping portion B is not too wide unlike the conventional electric wire crimping terminal, and the medium-diameter electric wire D ₂ is not crimped. D ₂ , D
Crimp height C / H with no setting the crimping strength of the crimping portion B corresponds to ₂ is lowered a pair of folding return double pieces 3, 3 tips of 'is pressed against the inner bottom surface of the crimping portion B the crimp portion B without inconveniently divided into two chambers, it is possible to crimp the conductor of the wire D ₂ having the middle diameter with a sufficient crimping portions intensity as shown in FIG. 5 Te, escape of the wire D ₂ is prevented Is done. Good characteristics are also obtained for the contact resistance to the wire crimp terminal.

Furthermore to crimping of the conductor crimping terminal shown in FIG. 1 the conductor portion of the wire D ₁ of the large diameter, one side wall portion of the left and right opposite the crimping portion B fold double (left side in the figure) A crimping piece portion 4 formed using the remaining portion where the piece 3 is provided, and a crimping piece portion 4 ′ formed using the remaining portion where the folded double piece 3 ′ is provided on the other side (right side in the figure). As shown in FIG. 3, the large-diameter electric wires D ₁ and D ₁ are crimped to the electric wire crimping terminal by bending them opposite to each other.

As described above, the first embodiment of the present invention has a large diameter,
Electric wires D ₁ , D ₂ , of different diameters such as medium diameter, small diameter, etc.
Corresponds to D ₃ in the side wall portions of the left and right opposite the crimping portion B of one wire crimping terminal, thin for different widths contact length with respect to the wire D of the wire insertion direction corresponds to the wire diameter of the wire, A plurality of types of folded double pieces 3, 3 'for medium diameter etc.
The wires D ₁ , D ₂ , D ₃ of large diameter, medium diameter, small diameter, etc. are crimped as before even if the crimping width C / W of the crimping part B is the same, by overlapping and folding inside without set corresponding height C / H to the electric wire D ₃ of small diameter can be bonded under sufficient terminal crimping unit strength (pressure intensity). In addition, crimping part B
The contact resistance of the electric wires D ₁ , D ₂ , D ₃ with respect to the above can be used without abrupt increase even in a high temperature atmosphere.

FIGS. 6 to 8 show a second embodiment of the present invention. This embodiment is particularly suitable for crimping medium- and small-diameter electric wires D ₂ and D ₃ , respectively. . In this embodiment, the contact length in the insertion direction of the electric wire on one of the left and right side walls of the crimping portion B in the direction of insertion of the wire is equal to or less than 2/3 of the installation length L of the conductor crimping piece 2a. folding return double piece 3 for crimping the electric wire D ₂ diameter in forming the
And folding return double piece 3 to form a 1/3 of the width of the installation length L of the conductor crimping pieces 2a crimping the electric wire D ₃ of small diameter '
The foldable so provided, the other side wall portion provided so as to be folded folding return double piece 3 for crimping the electric wire D ₂ diameter in the following width 2 / 3L. Thus small diameter of the wire D ₃ by selectively folding it fold return double pieces 3, 3 to the inside of each crimping unit B, and the electric wire D ₁ of the large diameter if necessary with crimp the electric wire D ₂ having the middle diameter It differs from the first embodiment in that it can be crimped.

FIG. 9 to FIG. 11 show a third embodiment of the present invention.
It is optimally used to bond the ₂ and the electric wire D ₃ of small diameter. In this embodiment, one of the left and right opposite side walls of the crimp portion B has a middle diameter in which the contact length in the insertion direction of the electric wire is 2/3 or less of the length L of the conductor crimp pieces 2a. folding return double piece 3 for crimping a folding return double blank 3 and the small diameter of the wire D ₃ forming the 1/3 or less of the width of the installation length L of the conductor crimping pieces 2a for crimping the electric wire D ₂ of the ' preparative foldable so provided, the other for crimping the electric wire D ₃ of small diameter 1 /
A folded double piece 3 'having a width of 3 L or less is provided so as to be able to be folded. Thus, the folded double pieces 3, 3 'are connected to the conductor crimping pieces 2a,
2a is selectively folded back to the inside of the wire D to reduce the diameter.
_3, the electric wire D ₂ having the middle diameter, more different from the respective embodiments the points to be crimped to electrical wires respectively corresponding to the electric wire D ₁ of the large diameter if necessary.

FIGS. 12 to 14 show a fourth embodiment of the present invention, and FIGS. 15 to 17 show a fifth embodiment of the present invention. Among them, the fourth of FIGS.
In the embodiment, the side wall portions left facing of the pair of conductor crimping pieces 2a at the compression bonding portion B, and a width of approximately 1/3 of the installation length L corresponding to the conductor crimping portion 2a in the electric wire D ₃ of small diameter Nasu 'is formed and the folding return double piece 3' fold double piece 3 crimping a small-diameter electric wire D ₃ by to Kaee folded by selective polymerization of the inner conductor crimping portion 2a (see FIG. 13) In addition, FIG.
As shown in FIG. 5, crimping piece portions 4, 4 'utilizing the remaining portions of opposing conductor crimping pieces 2a other than where the folded double piece 3' is provided.
The points so as to crimp the electric wire D ₁ of the large diameter by bending opposite is different from the respective embodiments. Also the fifth
In the embodiment, a folded double piece 3 'having an electric wire contact length of approximately 1 / 3L is formed on one of the left and right opposite side walls of the pair of conductor crimping pieces 2a in the crimping portion B. 'in addition capable of crimping the diameter of the wire D ₃ as shown in FIG. 16 by folding the selectively on the inside of the conductor crimping pieces 2a, crimping piece portion of the remainder of 4,4' double piece 3 by bending opposite as shown in FIG. 17 and to be able to crimp the electric wire D ₁ of the large-diameter crimp portion B.

FIGS. 18 to 20 show a sixth embodiment of the present invention. In this embodiment, the crimping portions a pair of conductor crimping pieces 2a of the right and left opposing folding return second width forming the wire contact length corresponding to the conductor portion of the wire D ₂ of the medium-diameter on at least one side wall portion of duplex in B form pieces 3, the folding return double piece 3 crimping the electric wire D ₂ having the middle diameter by selectively folding it inside the conductor crimping pieces 2a at the compression bonding portion B (see FIG. 19) Noto, crimping piece 4,4 'crimping the electric wire D ₁ of the large diameter by bending opposite (FIG. 2
0) is different from the above embodiments.

It should be noted in the above-described each embodiment, mainly middle diameter of the wire D ₂ a width of approximately 2/3 folding return double piece 3 of the installation length L of the conductor crimping pieces 2a of the electric wire insertion direction for caulking formed, also has formed to a width of approximately 1/3 of the installation length L of the conductor crimping pieces 2a of the electric wire insertion direction of the folding return double strip 3 'for caulking the electric wire D ₃ of small diameter, the This illustrates a was in short fold double pieces 3,3-contact width to wire D is the wire insertion direction of the conductor crimping pieces 2a of the installation length L GaFutoshi径of 'middle diameter, the small diameter such as wires D ₁ , D ₂ , and D _3, a plurality of types of folded double pieces 3 and 3 ′ are provided on the conductor crimping piece 2 a so as to correspond to the wire diameters. The present invention is within the scope of the present invention as long as the electric wires D ₁ , D ₂ , and D ₃ can be swaged.

[0032]

As described above, according to the present invention, an electric wire can be easily formed by a single type of crimp terminal corresponding to electric wires having different diameters such as a large diameter, a medium diameter, and a small diameter, and a strong terminal crimping force can be obtained. Crimping can be performed reliably, and sharing is achieved. In addition, the contact resistance at the conductor crimping section is stable even in a high temperature atmosphere,
It has high reliability as a product and is economically excellent.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of an electric wire crimp terminal of the present invention.

FIG. 2 is a sectional view of a used state in which an electric wire is crimped on the same line of FIG. 1;

FIG. 3 is a sectional view of a used state in which an electric wire is crimped on the rolled wire of FIG.

FIG. 4 is a sectional view of a used state in which a folded double piece provided on one conductor crimping piece in the crimping part is folded back to crimp an electric wire to the crimping part.

FIG. 5 is also a crimping height of a terminal crimping portion in the present embodiment.
FIG. 6 is a characteristic diagram showing a relationship between C / H, low-voltage current resistance, and terminal crimp strength.

FIG. 6 is a perspective view showing a second embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a usage state in which the folded double piece 3 is folded back facing the inside of a pair of conductor crimping pieces to crimp an electric wire.

FIG. 8 is a cross-sectional view showing a use state in which the folded double piece 3 ′ is folded and the electric wire is crimped.

FIG. 9 is a perspective view showing a third embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a usage state in which the folded double piece 3, 3 'is folded back to face the inside of a pair of conductor crimping pieces and the wire is crimped.

FIG. 11 is a cross-sectional view showing a use state in which the folded double piece 3 ′ is folded back to crimp an electric wire.

FIG. 12 is a perspective view showing a fourth embodiment of the present invention.

FIG. 13 is a cross-sectional view showing a use state in which the folded double pieces 3 ′, 3 ′ are folded in opposition to the inside of a pair of conductor crimping pieces to crimp an electric wire.

FIG. 14 is a cross-sectional view showing a use state in which an electric wire is crimped by a pair of crimping pieces.

FIG. 15 is a perspective view showing a fifth embodiment of the present invention.

FIG. 16 is a cross-sectional view showing a use state in which the folded double piece 3 ′ is folded and the electric wire is crimped.

FIG. 17 is a cross-sectional view showing a use state in which a pair of crimping pieces are bent opposite to each other to crimp an electric wire.

FIG. 18 is a perspective view showing a sixth embodiment of the present invention.

FIG. 19 is a cross-sectional view showing a use state in which one folded double piece 3 is folded and an electric wire is crimped.

FIG. 20 is a cross-sectional view showing a state where the electric wire is crimped by a pair of crimping pieces.

FIG. 21 is a perspective view showing a state where an electric wire is pressed against a conventional electric wire crimp terminal.

FIG. 22 is a front view of FIG. 21;

FIG. 23 is a cross-sectional view taken along the line I′-A ′ of FIG. 21 in a state where the small-diameter electric wire is crimped at the crimping portion.

FIG. 24 is a cross-sectional view taken along the line I′-A ′ of FIG. 21 in a state where the large-diameter electric wire is crimped at the crimping portion.

FIG. 25 is a perspective view showing an example of a conventional electric wire crimping device.

FIG. 26 is a characteristic diagram showing a relationship among a contact resistance, a wire fixing force, and a crimping height in a conventional wire crimp terminal.

FIG. 27 is a graph showing the relationship between terminal crimp strength, low voltage current resistance, and crimp height C / H when the crimp height of the terminal in the conventional wire crimp terminal is set to a large diameter wire. FIG.

FIG. 28 is a graph showing the relationship between the terminal crimping portion strength, the low voltage current resistance, and the crimping height C / H when the crimping height of the terminal is set to a small diameter wire in the conventional wire crimping terminal. FIG.

[Explanation of symbols]

1 wire crimping terminal 2a conductor crimping portions 2b wire crimping piece 3 fold return double piece 3 'folding return double piece 4 crimping piece portion 4' crimping pieces A electrical contact portion B crimped portion D wire D ₁ larger diameter in the wire D ₂ Diameter wire D ₃ small diameter wire L installation length

Claims (7)

(57) [Claims] 1. An electric wire crimping terminal formed of a thin metal plate and provided with an electric contact portion and a crimped portion of a conductor having a folded double piece, wherein the folded double piece has a contact length with respect to an electric wire in a wire insertion direction. A wire crimp terminal, wherein a plurality of different types are formed on a conductor crimping piece according to the wire diameter of the wire. 2. The folded double piece has a contact length in the insertion direction of the electric wire corresponding to a medium-diameter or small-diameter electric wire, which is approximately 2/3 of the installation length of the conductor crimping piece. The wire crimp terminal according to claim 1, wherein the wire crimp terminal is folded back to a width of 1/3. 3. A plurality of types of the folded double piece are formed on one of the left and right opposite side walls of the conductor crimping piece with a middle diameter of the electric wire and the other with a contact length corresponding to a small diameter of the electric wire. The electric wire crimping terminal according to claim 1 or 2, wherein: 4. The folded double piece has a plurality of types having a contact length corresponding to a medium diameter and a small diameter of one of the left and right opposite side walls of the conductor crimping piece, and a contact length corresponding to the medium diameter of the other. The wire crimp terminal according to claim 1 or 2, wherein a wire is formed. 5. A folded double piece having a contact length corresponding to a medium diameter and a small diameter of one of the left and right opposite side walls of the conductor crimping piece and a contact length corresponding to a small diameter of the electric wire on the other side. The wire crimp terminal according to claim 1 or 2, wherein a wire is formed. 6. A plurality of folded double pieces having a contact length corresponding to a middle diameter of an electric wire on at least one of left and right opposite side walls of a conductor crimping piece. An electric wire crimp terminal according to claim 1 or 2. 7. A plurality of folded double pieces having a contact length corresponding to a small diameter of an electric wire on at least one of left and right opposite side walls of a conductor pressure contact piece. An electric wire crimp terminal according to claim 1 or 2.