JP2970362B2 - Terminal crimping structure, terminal crimping method and crimp terminal used for these - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crimping structure and a crimping method for an open barrel type crimping terminal and a crimping terminal used therefor.

[0002]

2. Description of the Related Art Conventionally, as one of crimp terminals crimped to an end of an electric wire, it is crimped to a core wire W1 at an end of the electric wire W as shown in FIG. There is known an open barrel type crimp terminal 90 in which a pair of wire barrels 91 and a pair of insulation barrels 92 that are crimped to the covering end W2 are protruded. Each of the barrels 91 and 92 of the crimp terminal 90 is formed in a line-symmetrical shape having a substantially U-shaped cross section, and a core wire W1 of the electric wire W is provided between the wire barrels 91 and a coating end is provided between the insulation barrels 92. With the parts W2 respectively introduced,
The two crimpers 93 and anvils 94 of the terminal crimping device, which are vertically opposed to each other with the barrels 91 and 92 interposed therebetween, sandwich the barrels 91 and 92 respectively and crimp the crimp terminals 90 to form electric wires. It can be crimped to the end of W.

[0003] As a crimping method of the wire barrel 91, a tip portion 91 of one wire barrel 91 is used.
a to overlap the tip portion 91b of the other wire barrel 91 (see FIG.
No. 5478), and each wire barrel 91
B-type crimping in which each of the tips 91a and 91b is cut into the core wire W1 of the electric wire W while one of the tips 91a is in contact with the other tip 91b (FIG. 12 and FIG.
-37840) is generally employed.

[0004] In the above-mentioned overlap crimping, each wire barrel 91 may be expanded by an elastic restoring force, and the electrical and mechanical connection performance may be reduced. Therefore, it is also performed to bend each wire barrel 91 at an acute angle so as to prevent each wire barrel 91 from expanding (for example, see Japanese Utility Model Publication No. 52-24784). However, also in this case, since the tips 91a and 91b of the respective wire barrels 91 are merely in contact with each other, when the core wire W1 thermally expands, it is necessary to prevent the respective wire barrels 91 from expanding. Cannot be suppressed. For this reason, the electrical and mechanical connection performance is apt to be deteriorated due to the repetition of expansion and contraction of the core wire W1, and it is difficult to apply the wiring to a wire used under a large vibration condition such as a wire harness for an automobile. there were.

[0005] In the B-type crimping, since the distal end portion 91a of one of the wire barrels 91 and the distal end portion 91b of the other wire barrel 91 are in contact at the center, each of the core wires W1 is thermally expanded. Wire barrel 91
Even if the wire barrel 91 is pressed in the direction in which the wire barrel 91 is expanded, the pressing forces cancel each other at the contact portion at the central portion to prevent the wire barrels 91 from expanding. However, in the B-type crimping, the core wire W1 may be biased toward one of the wire barrels 91 during the crimping, and in this case, a difference in the crimping density occurs between the left and right wire barrels 91, and the contact is reduced. There has been a problem that desired electrical and mechanical connection performance cannot be obtained, such as an increase in resistance and an increase or decrease in crimp strength. Also,
Since each wire barrel 91 bites between the core wires W1, the core wire W1 is damaged and the core wire breaks during use,
In some cases, desired electrical connection performance could not be obtained.

On the other hand, conventionally, as one of the connectors for making an electrical connection between electric wires, a crimp connector that can crimp a crimp terminal to an electric wire inside a connector housing has been provided. This crimp connector is shown in FIG.
As shown in FIG. 3, openings 101 and 102 are provided on both upper and lower surfaces of the connector housing 100, and these openings are
3, 104 so that it can be opened and closed,
Inside the connector housing 100, a plurality of crimp terminal insertion portions 105 are arranged in parallel. According to this crimp connector, the crimp terminal 93 is inserted through the crimp terminal insertion portion 105 in a state where the crimp terminal 90 is loaded in each crimp terminal insertion portion 105, and the crimp terminal 90 is inserted between the crimp terminal 90 and the anvil 94.
By crimping the wire barrel 91, the wire barrel 91 can be crimped to the core wire W1 at the end of the electric wire W, and at the same time the insulation barrel 92 of the crimp terminal 90 is received at the bottom of the connector housing 100. By pressing, the insulation barrel 92 can be crimped to the coated end of the electric wire W. Such a crimping connector includes an electric wire W and a crimping terminal 90.
There is an advantage that the crimping operation with the wire harness can be performed easily and quickly, and it is extremely suitable particularly for achieving automation of the manufacture of the wire harness.

However, in both the overlap crimping and the B-type crimping, the crimp width d is widened, so that the widths of the crimper 93 and the anvil 94 that crimp the crimping width d are also widened, and the crimp terminal insertion portion of the crimping connector is formed. 105
Cannot be inserted through the crimper 93. For this reason, there is a problem that it cannot be applied as a crimping method in a crimping connector.

Further, the crimper 93 used for the above-mentioned overlap crimping is provided with a first curved surface 93c and a second curved surface 93c, which are smoothly continuous by providing a step 93b inside the notch groove 93a for introducing each wire barrel 91. (See FIG. 11), and the wire barrel 91 is sandwiched and pressed between the curved surface 93d and the anvil 94, so that the distal end portion 91a of one of the wire barrels 91 is supported. The leading end portion 91b of the other wire barrel 91 is arranged along the corresponding second curved surface 93d on the first curved surface 93c to be formed, and a step 93b at the boundary between the curved surfaces 93c and 93d is used to make the wire barrel 91. Is overlapped on the outer peripheral side of the distal end portion 91b of the other wire barrel 91 and swaged.

However, using the crimper 93,
When crimping terminals 90 having a narrow crimp width d such as for thin wires are overlap crimped, the tip 91a of one wire barrel 91 and the tip 91b of the other wire barrel 91 are crimped.
May abut each other without overlapping each other (see FIG. 14C). This is because when the wire barrel 91 portion of the crimp terminal 90 is introduced into the notch groove 93a of the crimper 93, the tip portion 91a of one wire barrel 91 and the tip portion 91b of the other wire barrel 91 are firstly connected to each other. This is because the crimping operation proceeds without contacting the curved surface 93c (see FIG. 14A) without releasing the butting condition (see FIGS. 14B and 14C). And in this case, the wire barrel 91
When there is no escape place, the both sides of the wire barrel 91 buckle, cracks K of wrinkles are generated, and the crimping portion becomes easy to open, so that the electrical and mechanical connection performance deteriorates. The problem is that it does.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has excellent electrical and mechanical connection performance, and can be applied to a crimp connector. An object is to provide a crimp terminal.

[0011]

In order to achieve the above object, the present invention provides an open barrel type crimp terminal having at least a pair of barrels, which comprises crimping the barrel portion so that one barrel is connected to the other barrel. causes overlap on the outside of, in order to prevent the respective barrel is expanded, the terminal crimping structure are engaged to the tip side of the distal end side and the other of the barrel of one of the barrel, when the crimping
And the other end of the barrel
Along the arc-shaped convex surface formed inside,
By bending and deforming in the opposite direction, the convex
Form a concave surface to be engaged in surface contact with the surface, and with the convex surface
Along with engaging the concave surface, the tip of the other barrel shares the tangent of the contact portion between the convex surface and the concave surface by the above-mentioned curve and deformation, and a corner point that becomes the center of the expansion of one barrel. a state than arcuate path having a center is protruded outwardly, a terminal crimping structure characterized in that abutted against the inner surface of one of the barrel.

[0012] In a preferred embodiment, the engagement surfaces of the one barrel and the other barrel each have a portion substantially extending in the caulking direction. In another preferred embodiment, the one barrel is longer than the other barrel. In a terminal crimping method according to another aspect of the present invention for obtaining the terminal crimping structure as described above, in a state where a tip portion of one barrel is turned outward to form a thick portion,
Each barrel is introduced into the notch groove of the crimper, and the one barrel is curved along the inner part of the notch groove so as to overlap the outside of the other barrel, and the thick wall portion allows the one barrel to have a curved shape. The inside of the tip side is a convex surface, and the tip side of the other barrel is along the convex surface,
By bending and deforming in the opposite direction, deforming the outside of each to a concave surface, to prevent each barrel from expanding,
Engage both sides and attach the other end of the barrel.
The end is brought into contact with the convex and concave surfaces by the above-mentioned bending and deformation.
Share the tangent of the part, and with the center of expansion of one barrel
Than an arc-shaped trajectory centered on a corner point
While projecting outward, hit the inside of one barrel.
It is characterized in that shining.

In a terminal crimping method according to a preferred embodiment ,
In a state in which the tip of the one barrel is protruded by a predetermined length from the tip of the other barrel, each barrel is introduced into a cutout groove of the crimper, and each barrel is tilted in a direction to approach each other. The one barrel is curved along the inner part of the notch groove and overlaps the outside of the other barrel.

The crimp terminal according to the present invention is for obtaining the terminal crimp structure as described above, and has one barrel.
One end of the barrel
The inside of the tip of the barrel is convex, and the outside of the tip of the other barrel is
It is noted that the thick portions that deform the
It is a sign.

In the crimp terminal according to a preferred embodiment, the tip of one barrel having the thick portion protrudes by a predetermined length from the tip of the other barrel .

[0016]

According to the present invention, since one barrel is overlapped with the other barrel, there is no fear that the core wire is deviated or the core wire is damaged by the barrel as in the case of B-type crimping. Moreover, at the time of swaging, the tip of the other barrel
Side, the arc-shaped formed inside the tip side of one barrel
Curved and deformed in the opposite direction to the caulking direction along the convex surface
By doing so, the outer surface is engaged with the convex surface in a surface contact state.
That the concave surface of the form, along with being engaged with the concave and the surface contact of the convex surface and the other of the barrel of one of the barrel, the
Of the other barrel due to the curvature and deformation of the
Share the tangent of the contact portion with the concave surface and
Arc shall be the center of the corner points of the expanded center of Le
With one of the barrels protruding outward from the line trajectory
To the inside.

Therefore, due to the thermal expansion of the core wire,
For example, the direction perpendicular to the caulking direction indicated by the solid arrow in FIG.
Component acting in the opposite direction, and acting in the opposite direction to the caulking direction.
All of which are received by the above-mentioned double engagement structure.
Each barrel can be expanded by the component force.
Opening can be suppressed. As a result, these
All of them can exert strong resistance to component force.
Better electrical and mechanical connection performance
In both cases, increase the crimp height and narrow the crimp wide.
Inside the crimp connector housing
It is also possible to perform terminal crimping at the part. Honorable
In the detailed book, "The corner that is the center of the expansion of one barrel
"Point" means the base end of the one barrel, that is, the terminal
Located at the connection with the body and above one of the barrels
It means a point that is the center of expansion of the terminal body.

According to the second aspect of the present invention, since the engagement surface between the one barrel and the other barrel has a portion substantially along the caulking direction, it is orthogonal to the caulking direction due to the thermal expansion of the core wire. Particularly strong resistance can be exerted against the component force acting in the direction. Further, according to the third, fifth and seventh aspects of the present invention, each barrel is crimpered in a state where the tip of one barrel projects a predetermined length from the tip of the other barrel. To prevent the front ends of the barrels from abutting each other at the inside of the cutout groove of the crimper. Also,
After each barrel is introduced into the cutout groove of the crimper, if each barrel is tilted in a direction approaching each other, a gap can be formed between the tip of the other barrel and the inner depth of the cutout groove of the crimper. Therefore, the one barrel can be easily and reliably guided to the outside of the other barrel.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 2 is a front view of an essential part showing a terminal crimping apparatus used in the terminal crimping method of the present invention. In this terminal crimping apparatus, the crimper 1 and the anvil 2 which sandwich and crimp the crimp terminal A loaded inside the connector housing C1 of the crimp connector C, and the crimper 1 sandwiches the tip side of the crimper 1 and the leg is opened. And a claw holding member 3 for regulating the pressure.

As shown in FIG. 3, the crimp terminal A is a pair of wire barrels A crimped to the core wire W1 of the electric wire W.
1, A2 and a pair of insulation barrels A3, A4 crimped to the coated end W2 of the electric wire W, respectively.
The wire barrels A1 and A2 protrude from the left and right sides of the main body A0 , and the wire barrels A1 and A2 are provided with a step E at the leading end so that the leading end of one of the wire barrels A1 is larger than the leading end of the other one. It is projected a predetermined length (see FIG. 1a). In addition, the one wire barrel A1
Is folded inward, thereby forming a step T at the tip (see FIG. 4). When the wire barrels A1 and A2 are crimped to the core wire W1 of the electric wire W and crimped, the step T indicates the tip end side of the other wire barrel A2 by a solid arrow Z 'in FIG.
By bending and deforming in the opposite direction to the tightening direction,
A concave surface is formed on the surface and the surface is in contact with the concave surface.
Is intended to be a convex surface for engagement, the step t is set to approximately the thickness of the wire barrel A1, the distance L from the tip of the wire barrel A1 is wire barrel A
The thickness is set to about 2 to 4 times the plate thickness of No. 1.

The crimper 1 is provided so as to be able to move up and down above the connector housing C1. The crimper 1 is moved downward by pressurizing means (not shown), that is, as indicated by a solid arrow Z 'in FIG.
By pressing in the crimping direction , the wire barrels A1 and A2 of the crimp terminal A can be pressed and crimped. The crimper 1 is capable of inserting a plurality of crimp terminal insertion portions C2 provided in parallel with the connector housing C1, and has a double-legged claw portion 11 formed at the lower end thereof. The gap between the parts 11 is formed as a cutout groove 10 for caulking the wire barrels A1 and A2 of the crimp terminal A in cooperation with the anvil 2.

As shown in FIG. 1, an introduction guide 10a for guiding the introduction of the wire barrels A1 and A2 is formed at the open end of the notch groove 10. The introduction guide 10a is connected to the introduction guide 10a. Thus, a pressing portion 10b is formed to press the wire barrels A1 and A2 toward each other and tilt them. A curved portion 10c is formed in the inner deep portion of the notch groove 10 to bend each of the wire barrels A1 and A2 so that one wire barrel A1 overlaps the other wire barrel A2. This curved part 10
c is a substantially semicircular shape having a single curved surface, and its radius r is set so as to satisfy the following expression I with respect to a step E between one wire barrel A1 and the other wire barrel A2. Have been.

Πr / 2 ≒ E (Equation I) The groove width D1 of the pressurizing portion 10b is set so that both wire barrels A1 and A2 are inclined in a direction approaching each other.
In the tilted state, the crimp terminal A has a wire barrel A1 and a wire A2 where the tip of one wire barrel A1 and the extension of the tip of the other wire barrel A2 intersect at substantially the center of the cutout groove 10. Full width D2
It is set smaller than the predetermined width.

The anvil 2 has a connector housing C
1, and its upper end protrudes from the set position 4 (see FIG. 2) of the connector housing C1 by a predetermined height. Therefore, the upper end of the anvil 2
With the connector housing C1 set in the set position 4, the crimp terminal insertion portion C of the connector housing C1 is set.
2 will be introduced.

The claw holding member 3 holds the claw 11 of the crimper 1 when the crimping terminal A is swaged to prevent the claw 11 from being opened.
, A holding member 32 for holding the holding piece 31 slidably in the vertical direction, and a spacer 33 for adjusting the height of the holding piece 31. The holding piece 31 has a surface 31a on the side that comes into contact with the claw portion 11 formed vertically, and the opposite side of this surface 31a is formed as an inclined surface 31b whose upper portion gradually approaches the claw portion 11 side. Each holding piece 31 has an insertion hole 31c through which a screw N for fixing the holding piece 31 to the holding member 32 is inserted. The insertion hole 31c is formed in a long hole so as to allow the vertical movement of the holding piece 31 to be adjusted.

The holding member 32 has a groove 32a into which the holding piece 31 can be introduced, and a side wall 32b of the groove 32a extends along the inclined surface 31b of the holding piece 31. The spacer 33 is interposed between the base 5 for fixing the holding member 32 and the bottom surface of the holding piece 31, and the contact surfaces of the holding piece 31 and the spacer 33 are formed as inclined surfaces. I have. The spacer 33 is provided so as to be movable in the horizontal direction along the base 5, and by adjusting the amount of movement in the horizontal direction, the holding piece 31 can be moved and adjusted in the vertical direction. ing. In this way, by adjusting the movement of the holding piece 31 in the vertical direction, the gap between the claw portion 11 and the holding piece 31 can be adjusted to be substantially zero.

In the terminal crimping apparatus, a punch which clamps the insulation barrel A2 of the crimp terminal A with the covering end W2 of the electric wire W interposed between the crimper 1 and the bottom of the connector housing C1. It is configured to be movable (not shown). With the above configuration, the crimp terminal A inserted into the crimp terminal insertion portion C2 of the connector housing C1 is supported by the anvil 2 (FIG. 1).
a), the crimper 1 is lowered, and the crimper 1 is introduced into the crimp terminal insertion portion C2 of the connector housing 1, whereby the wire barrels A1, A2 of the crimp terminal A are formed.
Can be guided into the notch groove 10 by the introduction guide portion 10a of the crimper 1 (see FIG. 1B), and the wire barrel A can be guided by the pressing portion 10b.
1 and A2 can be tilted in a direction approaching each other (see FIG. 1c). When the crimper 1 is further lowered, the wire barrel A1 on the long side hits the curved portion 10c of the notch groove 10 (see FIG. 1d) and is gradually curved along the curved portion 10c of the notch groove 10 (see FIG. 1D). 1e). By further lowering the crimper in this state, the curved long-side wire barrel A1 is
It can overlap with the outside of the other wire barrel A2, and the front end of the other wire barrel A2 can be engaged with the step T formed on the long wire barrel A1 (FIG. 1f). reference).

As described above, the wire barrels A1 and A2 of the crimp terminal A can be crimped to the core wire W1 of the electric wire W. In this crimping, the position of the step portion T is determined according to the outer diameter of the core wire W1. And the step E between the wire barrels A1 and A2 are appropriately selected, so that the stepped portion T of one wire barrel A1 and the tip end of the other wire barrel A2 are swaged in such a manner that their engagement surfaces S are swaged. The wire barrel A2 is engaged so as to be substantially along with the tip of the other wire barrel A2 against the inside of one wire barrel A1 (see FIG. 5).

Here, in the terminal crimping structure of FIG.
Inside the distal end side of said one barrel A1, as described above
By providing the step portion T, an arc-shaped convex surface S1 is formed, and at the time of caulking, the tip side of the other barrel A2.
In the direction opposite to the caulking direction along the convex surface S1.
By bending and deforming, the convex surface S1 and the surface
A concave surface S2 to be engaged in a contact state is formed, and the convex surface S1 is formed.
And the concave surface S2 are engaged. Further, as shown in the drawing, in the terminal crimping structure shown in FIG. 5, the tip of the other barrel A2 is abutted against the inner surface of one barrel A1 in a state of protruding outside the locus of the predetermined arc line J. ing. The arc line J shares the tangent of the contact portion between the convex surface S1 and the concave surface S2, and has a base end side of one barrel A1 , that is, a terminal terminal.
The terminal book of the barrel A1 located at the connection with the body A0
It is centered on a corner point P1 which is the center of expansion with respect to the body A0 .

According to the above embodiment, since the wire crimping terminal A overlaps the wire barrels A1 and A2 with each other, there is no possibility that the core wire W1 is biased right and left as in the case of the B-type crimping. And mechanical connection performance can be obtained. Further, since there is no possibility that the wire W1 is damaged by the wire barrels A1 and A2, the wire breakage during use can be prevented.

In addition, the tip of the other barrel A2 is
As described above, project outside the locus of the predetermined arc line J.
In this state, the convex surface S1 of the one wire barrel A1 and the concave surface S2 of the other wire barrel A2 are engaged while abutting against the inner surface of the one barrel A1, so that each wire barrel A1 is thermally expanded by the core wire W1. , A2 can be prevented from expanding. Therefore, it is possible to prevent the electrical and mechanical connection performance from being deteriorated due to the thermal expansion. That is , in the terminal crimping structure shown in FIG.
When the core wire W1 thermally expands, the distal end of the wire barrel A1 attempts to expand along the circular arc line J.
With one of the barrels A1 protruding outward from the trajectory,
The concave surface S2 of the wire barrel A2 abutted on the inner surface
Can be received by the front end side of the vehicle. Further, with the thermal expansion of the core wire W1, the distal end side of the wire barrel A2 is to be expanded from the corner points P2 and P3 as a starting point, but the expanding action is reversed on the convex surface S1 of the wire barrel A1. Can be caught by Follow
And the component forces X, Y acting in the direction orthogonal to the caulking direction due to the thermal expansion of the core wire W1, and in the opposite direction to the caulking direction.
Each of them can exert a strong resistance to the acting component force Z. In particular, in the terminal crimping structure of FIG.
The engagement surface between the convex surface S1 and the concave surface S2 is almost in the caulking direction.
Since it has a part along the edge, the above-mentioned component X, Y
Especially strong resistance, and thermal expansion of core wire W1
The wire barrels A1 and A2 expand
Can be effectively suppressed.

And, as described above, each wire barrel A
Since the expansion of 1, A2 is suppressed, the crimp height h can be increased and the crimp width d can be reduced. As a result, terminal crimping in the connector housing C1 described above becomes possible for the first time. Further, in the above embodiment, each of the wire barrels A1, A2 is connected to the crimper 1 with the tip of one wire barrel A1 protruding a predetermined length from the tip of the other wire barrel A2.
Of each wire barrel A1,
There is no risk that the tips of A2 will abut each other in the inner part of the cutout groove 10 of the crimper 1. Further, since the wire barrels A1 and A2 are tilted in a direction of approaching each other, a gap Q is formed between the distal end of the other wire barrel A2 and the curved portion 10c of the cutout groove 10 (see FIG. 1d). ), When the long wire barrel A1 is bent along the bending portion 10c and then overlapped with the other wire barrel A2, the tip of the long wire barrel A1 is connected to the other wire barrel A2. Can be easily and reliably guided to the outside. Therefore, even for the crimp terminal A having a narrow crimp width d, the overlap crimping can be reliably performed.

On the other hand, in the terminal crimping device, the wire barrel A of the crimping terminal A is inserted into the cutout groove 10 of the crimper 1.
By pressing the portions 1 and A2, the process of tilting and bending the wire barrels A1 and A2 can be performed continuously, so that each of these processes can be performed easily and efficiently. In addition, since the curved portion 10c of the cutout groove 10 has a single curved surface, the curved portion 10c can be formed more easily than a conventional curved portion having two steps with a step.

Further, the relationship between the radius r of the curved portion 10c and the step E of the pair of wire barrels A1, A2 is πr / 2
Since it is set to be ≒ E, the wire barrel A1 on the long side is bent, and is approximately ３ of the bent portion 10c.
At the point along the range, the wire barrel A on the long side
The tip of the other wire barrel A2 approaches the tip of one (see FIG. 1d). Therefore, the wire barrel A1 on the long side can be guided more reliably to the outside of the other wire barrel A2.

In crimping the crimp terminal A,
Since the claw portion 11 of the crimper 1 into which the crimp terminal insertion portion C2 is inserted is pinched by the claw portion holding member 3, the claw portion 11 can be restricted from being opened, so that the crimper 1 and the anvil 2 In between, the wire barrels A1 and A2 of the crimp terminal A can be surrounded with almost no gap. Therefore, the wire barrels A1 and A2 can be caulked with a considerable pressure, and the wire barrels A1 and A2 can be securely and firmly pressed against the core wire of the electric wire W.

The step portion T of the one wire barrel A1 can be formed by various methods, for example, by a groove as shown in FIG. FIG. 7 is a cutaway perspective view of a main part showing another embodiment of the crimp terminal A. This crimp terminal A is different from the crimp terminal A shown in FIGS.
Is bent outward, thereby forming a thick portion F at the front end. When the wire barrels A1 and A2 are press-bonded to the core wire W1 of the electric wire W, the thick portion F is formed such that the inside of the tip side of one of the wire barrels A1 is a convex surface S1 and the other end of the wire barrel A2 is a Opposite to the caulking direction along the convex surface S1
When curved and deformed, the outside is concave surface S2 ,
Each is for deforming (see FIG. 8). Also for the crimp terminal A, the distance L from the tip of the wire barrel A1 is set to be about 2 to 4 times the thickness of the wire barrel A1. The tip of the wire barrel A1 protrudes by a predetermined length from the tip of the other wire barrel A2.

FIG. 8 shows a crimp terminal A having the thick portion F.
It is an expanded sectional view which shows the terminal crimping structure using. This terminal crimping structure is obtained by caulking the wire barrels A1 and A2 with a crimper 1 and an anvil 2, as in the case shown in FIG. The outer side of the barrel A2 is overlapped, and the inside of the distal end side of one of the wire barrels A1 has a convex surface S due to the thick portion F.
1, the tip end of the other wire barrel A2 is the convex surface
Curve and deform in the opposite direction to the caulking direction along S1
In Rukoto, the outer concave S2, respectively deformed, and engaged with the corresponding convex S1 and the concave S2, in the engaged state, FIG. 5 similarly to the wire barrel A2
The tip protrudes outside the arc line J. Further, the tip of the wire barrel A2 is abutted against the inside of the wire barrel A1.

According to the terminal crimping structure, the core wire W1 is heated.
When inflated, move the tip of wire barrel A1 over the circle
Attempts to expand along the arc line J.
The wire barrel A2 is received by the distal end side of the concave surface S2.
You can stop it. Also, the thermal expansion of the core wire W1
At the same time, the tip of wire barrel A2 is
Attempt to expand from the point P2.
The action is received by the convex surface S1 of the wire barrel A1.
Can be That is, due to the thermal expansion of the core wire W1
Component forces X and Y acting in a direction perpendicular to the tightening direction, and
Both are strong against the component force Z in the direction opposite to the caulking direction.
It can exhibit resistance.

FIG . 9 shows another embodiment of the terminal crimping structure.
It is an expanded sectional view. This terminal crimping structure is the terminal shown in FIG.
The difference from the crimping structure is that the wire barrel A1 has a thick
One wire barrel A1 without forming the meat portion F
The inside of the tip side of the wire barrel A on the convex surface S1, the other wire barrel A
2 with the crimping direction along the convex surface S1.
By bending and deforming in the opposite direction, the outside is concave surface S2
The convex surface S1 and the concave surface S2 are respectively deformed.
And wire tip of wire barrel A2
Protruding outward from the arc wire J, the wire barrel A1
Butts inside. In this embodiment, the crimper 1
Protrusions 10e are provided in the inner back, and each wire barrel A1, A
2 and at the same time,
The inside of the tip side of the wire barrel A1 is convex S1,
The outer side of the tip side of the wire barrel A2 on the concave surface S2
It is constituted by deforming each.

As the crimp terminal A used in the embodiment of the present invention, any one having at least a pair of wire barrels A1 and A2 protruding therefrom may be used.
There may be no step E between 1 and A2. Further, the present invention can be applied to not only the wire barrels A1 and A2 but also the insulation barrels A3 and A4, and can be applied to not only the inside crimping of the housing but also the outside crimping of the housing. be able to.

[0041]

As described above, according to the present invention, one barrel of the crimp terminal is overlapped with the other barrel, so that the core wire is deviated as in the case of the B-type crimp, or the core wire is damaged by the barrel. There is no danger. In addition, however
At the time, the tip side of the other barrel is
Caulking along the arc-shaped convex surface formed inside the side
By bending and deforming in the opposite direction,
By forming a concave surface that engages in the surface contact state with the convex surface , the convex surface of one barrel and the concave surface of the other barrel are engaged in the surface contact state, and by the above-described bending and deformation,
Connect the tip of one barrel to the tangent to the point of contact between the convex and concave surfaces.
And the corner which becomes the center of the expansion of one barrel
-Projecting outward from the locus of the arc line centered on the point
In this state, it hits the inner surface of one barrel.

Therefore, caulking is performed by thermal expansion of the core wire.
Component acting in the direction perpendicular to the
The component force acting in the opposite direction is
Can be perceived by the
Thus, the expansion of each barrel can be suppressed. Follow
All exhibit strong resistance to these components
Better electrical and mechanical connection performance
It can be used to increase crimp height,
Can be applied to crimp connectors by narrowing the width
It has a unique effect of

In particular, according to the second aspect of the present invention, since the engagement surface between the step of the one barrel and the tip of the other barrel has a portion substantially along the caulking direction, the thermal expansion of the core wire is achieved. Thereby, a particularly strong resistance can be exerted against a component force acting in a direction orthogonal to the caulking direction.
For this reason, more excellent electrical and mechanical connection performance can be exhibited.

Further, according to the third, fifth, and seventh aspects of the present invention, each of the two barrels is formed such that the tip of one barrel projects a predetermined length from the tip of the other barrel. By introducing the barrel into the cutout groove of the crimper, when each barrel is introduced into the cutout groove of the crimper, it is possible to prevent the tips of the barrels from abutting each other in the inner depth of the cutout groove of the crimper. . Also, by inclining each barrel in the direction approaching each other by the cutout groove of the crimper, a gap can be formed between the tip of the other barrel and the inner depth of the cutout groove of the crimper. When the barrel is overlapped with the other barrel, the one barrel can be easily and reliably guided to the outside of the other barrel. For this reason, even for a crimp terminal having a small crimp width, the overlap crimping can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a process chart showing a terminal crimping method of the present invention.

FIG. 2 is a sectional view of a main part showing a terminal crimping device.

FIG. 3 is a perspective view of a crimp terminal and an electric wire.

FIG. 4 is a cutaway perspective view showing a step portion of the wire barrel.

FIG. 5 is an enlarged sectional view showing a terminal crimping structure.

FIG. 6 is a cut perspective view showing another embodiment of the step portion of the wire barrel.

FIG. 7 is a cutaway perspective view of a main part showing another embodiment of the crimp terminal.

FIG. 8 is an enlarged sectional view showing another embodiment of the terminal crimping structure.

FIG. 9 is an enlarged sectional view showing still another embodiment of the terminal crimping structure.

FIG. 10 is a perspective view showing a conventional crimp terminal and a terminal crimping apparatus.

FIG. 11 is a cross-sectional view showing conventional overlap crimping.

FIG. 12 is a cross-sectional view showing a conventional B-type crimping.

FIG. 13 is a perspective view showing a crimp connector.

FIG. 14 is a cross-sectional view showing a mechanism of a crimp failure in conventional overlap crimping.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crimper 2 Anvil 10 Notch groove A Crimp terminal A0 Terminal main body A1 Wire barrel A2 Wire barrel P1 Corner point W Electric wire W1 Core wire T Step S Engagement surface S1 Convex surface S2 Concave surface F Thick portion

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01R 4/18 H01R 43/00 H01R 43/048

Claims (7)

(57) [Claims] 1. The crimping of the barrel portion of an open barrel type crimp terminal having at least a pair of barrels allows one barrel to overlap the outside of the other barrel and expand each barrel. order to suppress, in the terminal crimping structure are engaged to the tip side of the distal end side and the other of the barrel of one of the barrel, when the caulking, the tip end of the other barrel, one Barre
Along the arc-shaped convex surface formed inside the tip side of the
By bending and deforming in the opposite direction to the caulking direction,
On the side, a concave surface is formed which engages with the convex surface in surface contact.
Then, the convex surface and the concave surface are engaged with each other, and the distal end of the other barrel is bent and deformed.
In a state where the tangent line of the contact portion between the convex surface and the concave surface is shared, and one of the barrels protrudes outward from an arc-shaped trajectory centered on a corner point serving as the center of expansion of the one barrel, A terminal crimping structure characterized by abutting against the inner surface. 2. The terminal crimping structure according to claim 1, wherein each of the engagement surfaces of the one barrel and the other barrel has a portion substantially along a caulking direction. 3. The terminal crimping structure according to claim 1, wherein the one barrel is longer than the other barrel. 4. A terminal crimping method for obtaining a terminal crimping structure according to claim 1, 2 or 3, wherein a tip portion of one barrel is turned outward to form a thick portion. Insert the barrel into the crimper notch,
The one barrel is curved along the inner part of the notch groove so as to overlap with the outside of the other barrel, and the inside of the tip side of one barrel is made convex by the thick part, and the other barrel is formed. the distal end side, along a said convex surface
By bending and deforming in the opposite direction to the caulking direction.
The outer concave, respectively deformed, the barrel in order to prevent the expansion, is engaged with the both sides, the upper
The tip of the other barrel is bent, deformed,
Share the tangent of the contact between the convex and concave surfaces, and
Centering on the corner point, which is the center of barrel expansion
While projecting outward from the arc-shaped trajectory,
A method for crimping a terminal, wherein the terminal is brought into contact with the inner surface of a rel . 5. A direction in which each barrel is introduced into a cutout groove of a crimper in a state where the tip of the one barrel is protruded from the tip of the other barrel by a predetermined length, and the barrels approach each other. 5. The terminal crimping method according to claim 4 , wherein after tilting, the one barrel is curved along the inner part of the cutout groove and overlaps the outside of the other barrel. 6. A terminal crimping structure according to claim 1, 2 or 3.
A crimp terminal for obtaining, by folding the tip portion of one of the barrel outwardly to caulking time, one of Ba
The inside of the tip of the barrel is convex and the tip of the other barrel is
Thick portions to be deformed were formed on the outside with concave surfaces.
And a crimp terminal. 7. The crimp terminal according to claim 6 , wherein the tip of one barrel having the thick portion protrudes by a predetermined length from the tip of the other barrel.