JP7301559B2 - crimp terminal - Google Patents

Description

The present invention relates to a crimp terminal having a crimp portion to which an electric cable is crimped.

Conventionally, crimp terminals to which electric cables are crimped have been widely used. This crimp terminal is also required to be smaller and lighter. For this reason, an attempt has been made to construct a compact crimp terminal using a metal plate having a thickness smaller than that of the conventional one. If the plate thickness is reduced, there is a risk that cracks will occur due to crimping. In particular, when crimping an aluminum wire, it is necessary to break an oxide film, which is an insulator present on the surface of the aluminum wire, to ensure electrical connection between the aluminum wire and the crimp terminal. For this reason, when crimping an aluminum wire, it is necessary to crimp it more strongly than a copper wire.

Here, Patent Document 1 discloses a crimp terminal in which the width of the front half of the wire barrel in the front-rear direction is set wider than the width of the rear half, and the front half and the rear half are crimped so that they are at the same height. ing. In the case of this crimp terminal, the intention is to ensure electrical continuity in the front half and to maintain mechanical strength in the rear half.

JP 2009-152110 A

If the amount of material in the crimp terminal is not uniform from place to place, the portion with the larger amount will stretch more than the portion with the smaller amount during crimping. In the case of the crimp terminal disclosed in Patent Document 1, the wide front half of the wire barrel extends further forward than the rear half during crimping. As a result, the shape of the front and rear halves differs greatly from the front half, so the elongation of the material becomes unbalanced between the front and rear halves, which may cause problems such as cracking of the wire barrel. There is

In view of the above circumstances, it is an object of the present invention to provide a crimp terminal in which the balance of elongation of materials during crimping can be easily controlled, thereby suppressing the occurrence of defects such as cracks.

The crimp terminal of the present invention for achieving the above object is
a contact portion that contacts the mating contact; and
A crimping part having a wire barrel that conducts with the core wire of the electric cable by crimping and an insulation barrel that holds the covered portion of the electric cable by crimping,
The wire barrel has a protruding portion at the center portion in the front-rear direction of the wire barrel that projects outward from the side edges of the front-rear portion excluding the center portion , and avoids the center portion in the front-rear direction of the wire barrel. having a first serration and a second serration on the front and rear sides in the front-rear direction, respectively;
Each of the first serration and the second serration is arranged in the front-rear direction at an interval narrower than the interval between the first serration and the second serration, and a plurality of concave grooves or ridges each extending in the width direction The serration is composed of

The crimp terminal of the present invention has a protruding portion in the central portion in the front-rear direction. Therefore, during crimping, the material of the central portion is evenly stretched back and forth. This makes it easy to control the amount of elongation of the material by the shape of the protruding portion, etc., and it is possible to make adjustments so as to ensure electrical conduction and suppress defects such as cracks.

Here, in the crimp terminal of the present invention, the protruding portion protrudes from the first side edge of the portion forward of the central portion, drawing a first arc with the first side edge as a tangential line, and protruding from the first side edge. Draw a second arc in the opposite direction to the first arc to approach the second side edge of the portion rearward of the central portion, and further tangent to the second side edge in the opposite direction to the second arc. It preferably has a shape that draws a third arc to connect to the second side edge.

In this way, by forming the protruding portion without corners, breakage of the core wire during crimping can be suppressed as compared with the protruding portion with corners.

In the crimp terminal of the present invention, the wire barrel has serrations on both sides in the front-rear direction, avoiding the central portion in the front-rear direction.

The amount of material in the central portion where the protrusions are provided is large by the amount of the protrusions. For this reason, although the material of the central portion stretches back and forth during crimping, the compressibility of the central portion increases and the thickness of the plate becomes thin. Since the plate thickness of the material is thin, if a problem such as cracking occurs, the danger is higher in the central portion than in the front and rear portions.

Therefore, if the serrations are provided on both sides in the front-rear direction, avoiding the central portion in the front-rear direction, the absence of serrations in the central portion ensures a sufficient plate thickness of the material, thereby suppressing the risk of occurrence of defects.

Furthermore, when providing serrations on both sides in the front-rear direction, avoiding the center in the front-rear direction, The first serration provided on the front side and the second serration provided on the rear side preferably have the same shape and are arranged symmetrically in the front-rear direction with respect to the center of the wire barrel in the front-rear direction . preferred.

In this case, the longitudinal elongation of the material during crimping becomes more uniform, and it becomes easier to achieve both reliable electrical continuity and suppression of defects such as cracks.

According to the present invention described above, it is possible to realize a crimp terminal that achieves both reliable electrical continuity and suppression of defects such as cracks.

1 is a perspective view showing a crimp terminal before crimping according to a first embodiment of the present invention; FIG. It is the perspective view which showed the crimp terminal after crimping|compression-bonding of 1st Embodiment. FIG. 4 is a diagram showing a surface on which an electric cable is arranged by developing the wire barrel of the crimp terminal of the first embodiment into a plane. FIG. 6 is a perspective view showing a crimp terminal before crimping according to a second embodiment of the present invention; It is the figure which showed the surface by which the wire barrel of the crimp terminal of 2nd Embodiment is expand|deployed at planar shape, and an electric cable is arrange|positioned.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

FIG. 1 is a perspective view showing a crimp terminal before crimping according to a first embodiment of the present invention. FIG. 1 also shows the tip portion of the electric cable to be crimped to the crimp terminal.

FIG. 2 is a perspective view showing the crimped terminal after crimping according to the first embodiment. However, the core wire of the electric cable is not shown.

This crimp terminal 1 has a contact portion 10 , a connecting portion 20 and a crimp portion 30 .

The contact portion 10 of the crimp terminal 1 of this embodiment has a box shape with an opening 10A formed at the front end, and includes a bottom wall 11, a pair of side walls 12 rising respectively from the left and right edges of the bottom wall 11, and an upper a wall 13; A male contact portion of a mating terminal (not shown) is inserted from the opening 10A, and the crimp terminal 10 and the mating terminal are electrically connected.

Also, the connecting portion 20 is a portion that connects the contact portion 10 and the crimping portion 30 .

Moreover, the crimping portion 30 is a portion for crimping the electric cable 2 . The crimping portion 30 has a wire barrel 40 that conducts with the core wire 2a of the crimped electric cable 2, and an insulation barrel 50 that holds the covered portion 2b of the electric cable 2 by crimping.

For crimping, the wire barrel 40 is applied to the tip of the electric cable 2 where the core wire 2a is exposed. The length of the exposed portion of the core wire 2a is controlled. Then, when the exposed portion of the core wire 2 a is applied to the wire barrel 40 , the covered portion 2 b of the electric cable 2 is applied to the insulation barrel 50 . In this state, crimping is performed to obtain the shape shown in FIG.

FIG. 3 is a view showing the surface of the wire barrel of the crimp terminal of the first embodiment, which is developed in a plane and on which an electric cable is arranged.

The wire barrel 40 is formed with three serrations 41 extending in the width direction. In this embodiment, the serration 41 has a recessed surface on the side where the electric cable is arranged. A ridge may be provided instead of the recessed shape. The serrations 41 help the wire barrel 40 to bite into the core wire 2a by crimping, and ensure electrical connection between the crimp terminal 1 and the core wire 2a.

Also, the wire barrel 40 has a protruding portion 44 in the central portion in the front-rear direction that protrudes outward beyond the side edges 42 and 43 of the front and rear portions excluding the central portion. The protruding portion 44 protrudes from the first side edge 42 in a portion forward of the central portion, drawing a first arc with the first side edge 42 as a tangential line, and protruding in a direction opposite to the first arc. A second arc is drawn to approach the second side edge 43 in the rear portion of the central portion, and a third arc is formed in the opposite direction to the second arc, with the second side edge 43 as a tangent line. It has a shape drawn and connected to the second side edge 43 .

The wire barrel 40 has a large amount of material at the central portion in the front-rear direction, corresponding to the projecting portion 44 . For this reason, the central portion is strongly crimped by crimping, and the compressibility is increased. Further, a part of the material having a large central portion expands by an amount determined by the shape of the projecting portion 44, the pressure during crimping, and the like during crimping. Here, the amount of elongation to the front and the amount of elongation to the rear at the time of crimping are uniform, and control is easier than when the elongation is biased toward either one. As a result, it is possible to achieve both reliable electrical continuity and suppression of defects such as cracks.

FIG. 4 is a perspective view showing a crimp terminal before crimping according to a second embodiment of the present invention.

Moreover, FIG. 5 is a view showing the surface of the wire barrel of the crimp terminal of the second embodiment, which is unfolded in a plane and on which an electric cable is arranged.

Here, the same reference numerals as those used in the description of the above-described first embodiment are assigned, and only differences from the first embodiment will be described.

In the wire barrel 40 of the second embodiment, serrations are formed on both sides in the front-rear direction, avoiding the central portion in the front-rear direction. These serrations 41 have symmetrical shapes in the front-rear direction with respect to the center of the wire barrel 40 in the front-rear direction.

In the case of this second embodiment, the serrations 41 are provided on both sides in the front-rear direction, avoiding the central portion in the front-rear direction. The risk of occurrence of defects such as cracking of the barrel 40 is reduced, and reliability is improved. Furthermore, in the case of the second embodiment, the serrations 41 have a symmetrical shape in the front-rear direction with respect to the center of the wire barrel 40 in the front-rear direction. As a result, the material stretches forward and backward during crimping, making it easier to achieve both reliable electrical continuity and suppression of defects, thereby further improving reliability.

Although the crimp terminal 1 having the box-shaped contact portion 10 has been described here, the present invention can be applied regardless of the shape of the contact portion. That is, the contact portion may be male or hermaphroditic.

1 crimp terminal 2 electric cable 2a core wire 2b covered portion 10 contact portion 10A opening 11 bottom wall 12 side wall 13 top wall 20 connecting portion 30 crimp portion 40 wire barrel 41 serration 42 first side edge 43 second side edge 44 Protruding portion 50 Insulation barrel

Claims (4)

a contact portion that contacts the mating contact; and
A crimping part having a wire barrel that conducts with a core wire of an electric cable by crimping and an insulation barrel that holds the covered portion of the electric cable by crimping,
The wire barrel has a protruding portion at a center portion in the front-rear direction of the wire barrel that projects outward from the side edges of the front-rear portion excluding the center portion , and avoids the center portion in the front-rear direction of the wire barrel. having a first serration and a second serration on the front and rear sides in the front-rear direction, respectively;
Each of the first serration and the second serration has a plurality of recesses extending in the width direction, each of which is arranged in the front-rear direction at an interval narrower than the interval between the first serration and the second serration. A crimp terminal characterized by serrations formed of grooves or ridges . 2. The crimp terminal according to claim 1, wherein each of said first serration and said second serration is a serration composed of a plurality of grooves extending in the width direction. 3. The method according to claim 1, wherein the first serration and the second serration have the same shape and are arranged symmetrically in the front-rear direction with respect to the center of the wire barrel in the front-rear direction. Crimp terminals as described. The protruding portion protrudes from a first side edge of a portion forward of the central portion, drawing a first arc with the first side edge as a tangential line, and protruding in a direction opposite to the first arc. A third arc that draws a second arc and approaches the second side edge of the portion rearward of the central portion and is tangent to the second side edge in the opposite direction to the second arc. 4. The crimp terminal according to any one of claims 1 to 3, characterized in that it has a shape connecting to the second side edge by drawing a .

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