JP5403788B2 - Crimping structure of crimping barrel, crimping terminal and crimping device - Google Patents

Description

  The present invention extends the bottom plate part from both side edges of the bottom plate part and bends inward so as to wrap the conductor of the electric wire to be connected, so that the conductor is in close contact with the top surface of the bottom plate part. The present invention relates to a crimping structure of a crimping barrel having a conductor crimping piece that can be fastened, a crimping terminal having the crimping structure, and a crimping apparatus that crimps the crimping barrel and a conductor.

  Conventionally, as this type of crimp terminal, for example, one disclosed in the following Patent Document 1 is known. That is, as shown in FIG. 7, the crimp terminal 100 has a pair of fixed pieces 101 raised at the rear end portion, and each fixed piece 101 is connected to the rubber plug 103 through which the electric wire 102 is inserted. The rubber plug 103 is crimped together with the electric wire 102 by being caulked so as to be wound. Further, the respective fixing pieces 101 are displaced from each other in the front-rear direction, and are wound around the rubber plug 103 in a state of being wrapped in the front-rear direction so that the tips of the respective fixing pieces 101 abut each other or overlap in the vertical direction. There is no way. The crimp terminal 100 is inserted into a cavity of a waterproof connector housing (not shown) together with the rubber plug 103 through which the electric wire 102 is inserted, and is connected to the mating crimp terminal.

  However, since the crimp terminal 100 is wound around the rubber plug 103 with an elastic reaction force, a springback occurs after caulking, and as shown in the figure, the tip of each fixing piece 101 is lifted. obtain. Then, there is a concern that the inner wall surface (mirror finish) of the cavity of the waterproof connector housing interferes with the tip of each fixed piece 101 to damage the inner wall surface of the cavity. In view of this, Patent Document 1 also proposes a crimp terminal 200 for suppressing the occurrence of springback of the terminal fitting.

That is, as shown in FIG. 8 (A), the crimp terminal 200 has a pair of caulking pieces 201 raised at the rear end portion, and each caulking piece 201 has a front and rear as shown in FIG. 8 (B). In a state where the positions are alternately shifted in the direction, the electric wire 300 is wound around the rubber plug 301 to which the electric wire 300 is fitted and is caulked. Each caulking piece 201 is provided with a thin portion 202 that is thinned from the tip portion toward the base portion side, and the rigidity of the portion is reduced to facilitate the inward bending deformation operation. Thereby, generation | occurrence | production of a spring back is suppressed effectively.
JP 2004-303526 A

  As described above, such a crimp terminal is configured to reduce the rigidity by being thinned, and to effectively suppress the occurrence of springback during the crimping process.

  However, if such thinning has been applied in advance, each crimped piece (crimping) is carried out before the crimping terminal is transported to the work site or during storage until crimping. There is a risk that the shape will be deformed by some external force acting on the fragile thin wall portion of the barrel. As a result, a good caulking process cannot be performed on each caulking piece (crimp barrel), and a contact failure may also occur on the conductor of the electric wire.

  The present invention has been made in view of the above-described circumstances, and its purpose is that the crimping work can be performed in a good shape without causing deformation or the like until the crimping process is performed. An object of the present invention is to provide a crimping structure of a crimping barrel, a crimping terminal, and a crimping device that can effectively suppress the occurrence of springback during crimping.

In order to achieve the above-described object, the crimping structure of the crimping barrel according to the present invention is characterized by the following (1).
(1) A bottom plate portion and an upper surface of the bottom plate portion that extends upward from left and right side edges in the width direction of the bottom plate portion and is bent inward so as to enclose a conductor of an electric wire to be connected. A crimping structure of a crimping barrel having a conductor crimping portion having a plurality of conductor crimping pieces, and crimping the conductor by the conductor crimping portion,
Continuously along the axial direction of the conductor placed on the bottom plate portion, on the outer side of the bottom plate portion where the conductor crimping piece is bent by crimping, at both side portions in the width direction of the bottom plate portion. And a thin wall portion is formed on the bottom plate portion.

According to the pressure-bonding structure of the pressure-bonding barrel having the configuration of (1), the bottom plate portion is placed on the bottom plate portion on the outer side of the bottom plate portion bent by the pressure bonding, at both side portions in the width direction of the bottom plate portion. A groove along the axial direction of the conductor is formed, in other words, until the crimping process is performed, a groove that becomes a thin part is not formed in the conductor crimping part. The crimping work can be performed with the good shape without raising. In addition, it is possible to effectively suppress and suppress the occurrence of springback that occurs with bending deformation during crimping by the thin portion provided with the groove. Thereby, since it can suppress that a clearance gap generate | occur | produces between a conductor crimping | compression-bonding part and an electric wire conductor and troubles, such as a poor electrical contact, generate | occur | produce, a highly reliable crimping structure can be provided.

In order to achieve the above-described object, the crimping structure of the crimping barrel according to the present invention is characterized by the following ( 2 ).
( 2 ) The crimp terminal according to the present invention includes at least a part of the barrel having the crimp structure according to (1) .

According to the crimp terminal having the configuration ( 2 ), a highly reliable crimp structure can be provided not only for a bare crimp sleeve and the like but also for a crimp terminal having a part of the crimp structure.

In order to achieve the above-described object, the crimping apparatus according to the present invention is characterized by the following ( 3 ).
( 3 ) A crimping apparatus for crimping the crimping barrel of (1) and the conductor,
On the anvil on which the lower surface of the bottom plate portion is placed, a protrusion is formed at a position facing the portion where the groove is to be formed in the bottom plate portion when the conductor is crimped by the conductor crimping portion. ,
about.

According to the crimping device having the above configuration ( 3 ), a groove is formed on the outside of the bottom plate portion bent by the crimping, in other words, until the just before the crimping process, Since the groove to be formed is not formed, the crimping work can be performed while maintaining a good shape without causing deformation or the like during transportation or storage. In addition, it is possible to effectively suppress and suppress the occurrence of springback that occurs with bending deformation during crimping by the thin portion provided with the groove . Thereby, since it can suppress that a clearance gap generate | occur | produces between a conductor crimping | compression-bonding part and an electric wire conductor and troubles, such as a poor electrical contact, generate | occur | produce, a highly reliable crimping structure can be provided.

  According to the crimping structure of the crimping barrel of the present invention, after manufacturing the product until just before forming the crimping barrel by crimping, it is transported to the site where it is stored until it is crimped or to the site where the connection work with the wire is performed. During the operation, a state in which the thin portion is not formed in the conductor crimping portion can be maintained, so that safe and secure storage and transportation can be realized without deformation even when an external force or the like is applied. As a result, it is possible to reliably and stably perform the crimping operation while maintaining a good shape.

  In addition, the above-mentioned groove or depression is formed during the crimping process, and the occurrence of springback can be effectively suppressed during the crimping process, so that a gap is generated between the conductor crimping part and the wire conductor. Therefore, it is possible to prevent electrical contact failure and the like and to provide a highly reliable crimp structure.

  The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading through the best mode for carrying out the invention described below with reference to the accompanying drawings.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a crimp terminal 10 having a crimp structure of a crimp barrel according to the present invention. The crimp terminal 10 is formed by press-molding a conductive metal plate material, and is configured before performing a crimping operation by a crimping apparatus (or a crimping jig or the like) (see FIG. 1A). And the configuration after crimping (see FIG. 1B). The crimping terminal 10 has a bottom plate portion 20 and a wire connection provided on the front side (front side in FIG. 1) of the bottom plate portion 20. Part 21 and an electrical contact part 22 provided on the rear side (rear part in FIG. 1) of the bottom plate part 20. In addition, in the same figure, W shows an electric wire and W1 shows a core wire.

  Among these, in particular, the electrical contact portion 22 before crimping is formed with a pair of conductor crimping portions 23 and an insulator crimping portion 24 erected from both sides of the bottom plate portion 20 as shown in FIG. The conductor crimping part 23 and the insulator crimping part 24 respectively crimp and crimp the conductor W1 and the insulation coating W2 of the electric wire W, respectively.

  That is, the crimp terminal 10 used in the present embodiment has a longitudinal direction along the axial direction of the conductor W1 placed on the crimp terminal 10 (hereinafter, this direction is referred to as “front-rear direction”, and a direction perpendicular thereto). (Referred to as “left-right direction.”) A conductor crimping portion 23 (crimping) for crimping the conductor W1 exposed by removing the insulating coating W2 at the tip of the electric wire W to the electrical contact portion 22 on the rear end side. After that, they are called wire barrels V1 and V2, and a coating caulking portion 24 (after crimping, called insulator barrels V3 and V4) for crimping on the portion of the electric wire W having the insulation coating W2. It has. The electrical connection portion 21, the conductor crimping portion 23, and the insulator crimping portion 24 are configured to include a common bottom plate portion 20 (note that the bottom plate portion 20 until just before the crimping process will be described later. Note that the grooves G1, G2 have not yet been formed).

  The conductor crimping portion 23 is erected so as to extend upward from the left and right side edges of the bottom plate portion 20 in common with the wire connection portion 21 and wraps around the conductor W1 of the wire W to be connected. 2 conductor crimping pieces 23A and 23B that are crimped so that the conductor W1 of the electric wire W is in close contact with the upper surface of the bottom plate portion 20 by being bent inwardly.

  The two conductor crimping pieces 23A and 23B extending upward from the left and right side edges of the bottom plate portion 20 are portions having a U-shaped cross section as viewed from the front end side or the rear end side of the crimp terminal 10, and are symmetrical Is arranged. And after crimping the conductor W1 of the electric wire W with the conductor crimping pieces 23A and 23B, the bottom surface of the bottom plate portion 20 of the wire barrels V1 and V2 formed at the position where the conductor crimping pieces 23A and 23B are disposed. 2, grooves G1 and G2 (or depressions) extending in the front-rear direction as shown in FIG. 2 are formed from one end to the other end along the front-rear direction (axial direction). That is, in the crimping structure of the crimping barrel according to the present invention, as will be described in detail later, one end along the front-rear direction (axial direction) of the lower surface of the bottom plate portion 20 is suppressed during the crimping process in order to suppress the occurrence of springback. A groove (or a depression) as described above is formed from one end to the other end.

  On the other hand, the insulator crimping portion 24 has U-shaped sections formed so as to stand upright so as to extend the pair of covering crimping pieces 24 </ b> A and 24 </ b> B upward on both lateral edges of the bottom plate portion 20. The conductor crimping portion 23 and the insulator crimping portion 24 are arranged at an appropriate interval in the front-rear direction of the crimp terminal 10. Note that a groove (or recess) having the same structure may be formed in the insulator crimping portion 24 at the time of crimping and crimping.

  By crimping and fixing the crimp terminal 10 shown in FIG. 1 (A) to the electric wire W, the crimp structure of this embodiment shown in FIG. 1 (B) is obtained. That is, in the state where the conductor W1 of the electric wire W is disposed between the conductor crimping pieces 23A and 23B arranged symmetrically, the conductor crimping pieces 23A and 23B are as shown in FIG. Each of the conductors W1 is bent and crimped into a C shape so as to wrap around the outer periphery of the conductor W1, and thereby the conductor crimping portion 23 is crimped to the conductor W1 to form the wire barrels V1 and V2. The bending directions of the conductor crimping pieces 23A and 23B when the wire barrels V1 and V2 are formed by crimping the conductor crimping pieces 23A and 23B constituting the conductor crimping portion 23 are shown in FIG. It is indicated by an arrow in (B).

Here, the crimping method when crimping the conductor crimping portion 23 of the crimp terminal 10 to the electric wire W will be described in detail with reference to FIGS. 3 to 6.
First, a crimping apparatus (for example, a crimping jig) used for this crimping operation will be described with reference to FIG.
As this crimping jig, a jig composed of a crimper 30 and an anvil 40 is used. Of these, the crimper 30 is a so-called F-type, and descends toward the anvil 40. The lower end sides 31A and 31B protrude downward, and the guide groove 32 that receives the crimp terminal 10 therebetween. Is formed. The inner part of the guide groove 32 has a shape in which a protruding part 34 is provided between the left and right arcs 33A and 33B so as to connect the symmetrical arcs 33A and 33B.

  On the other hand, the anvil 40 rises from the lower side so as to face the crimper 30, and the upper part of the anvil 40 is configured by an upper surface 41 formed in a gentle arc shape that enters the guide groove 32 of the crimper 30. The upper surface 41 supports the lower surface of the bottom plate portion 21 of the crimp terminal 10. In particular, in the present invention, the wire barrels V1 and V2 after crimping are caused to adhere to the conductor W1 of the electric wire W at both ends of the upper surface 41 of the anvil 40. In other words, the occurrence of springback is possible. In order to be able to suppress it, it is possible to reduce the thickness of the bottom plate portion 21 of the conductor crimping portion 23 at any location between one end and the other end along the axial direction. Therefore, the pair of protrusions 42 that form the grooves G1 and G2 are provided so as to protrude upward (in the direction from the upper surface of the anvil 40 toward the lower surface of the bottom plate portion 21).

  Therefore, when the crimp terminal 10 is crimped between the crimper 30 and the anvil 40, the conductor crimping pieces 23A and 23B are bent inwardly along the arcs 33A and 33B in the guide groove 32, and the conductor crimping pieces 23A and 23B are bent. After the leading ends of the fastening pieces 23A and 23B abut each other, they are guided by the protruding portion 34 and bite into the conductor W1 of the electric wire. At the same time, the grooves G1 and G2 are formed by the biting of the protrusions 42 at the portions on both sides in the width direction of the bottom plate portion 21 of the conductor crimping portion 23. As a result, a B-type crimp structure similar to the letter “B” of the alphabet is completed.

Next, a crimping operation performed using such a crimping apparatus (for example, a crimping jig) will be described.
First, as shown in FIG. 4A, the crimp terminal 10 is set so that the bottom plate portion 21 is mounted on the upper surface 41 of the anvil 40, and the upper part of the anvil 40 on which the crimp terminal 10 is set is placed on the crimper 30. Insert into the guide groove 32. Then, as shown in FIG. 5B, when the anvil 40 is raised and the crimper 30 is lowered (if the anvil 40 or the crimper 30 moves in a direction relatively approaching the counterpart jig). The tip portions of the conductor crimping pieces 23A and 23B of the crimping terminal 10 set on the upper surface 41 of the anvil 40, as shown in FIG. It is pushed and bent along the surface of 33B toward each other.

  When the crimper 30 is continuously lowered, the conductor crimping pieces 23A and 23B are moved inward along the arcs 33A and 33B in the guide groove 32 as shown in FIGS. 5 (A) to 5 (C). The wire W is bent and bent into an arc shape, and the crimping operation of the electric wire W against the conductor W1 is started. At this time, as shown in FIG. 5 (A), the protrusions 42 provided on the left and right sides of the upper surface of the anvil 40 bite into the portions that become both side portions in the width direction of the bottom plate portion 21 that are the bases of the conductor crimping pieces 23A and 23B. Grooves G1 and G2 are formed. As a result, the conductor crimping pieces 23A and 23B tend to spread from the inside toward the outside as the thicknesses of the portions where the grooves G1 and G2 are formed are reduced. Restoring power can be reduced, leading to suppression of springback. That is, as will be described later, when the conductor crimping pieces 23A and 23B bite into the conductor W1 of the electric wire W and are crimped, the occurrence of a gap with respect to the conductor W1 of the conductor crimping pieces 23A and 23B is suppressed, and the fixing force is increased. It becomes possible to plan.

  Also, in the latter half of the crimping process shown in FIGS. 6A to 6C, after the leading ends of the conductor crimping pieces 23A and 23B abut each other, they are guided by the projecting portion 34 to be the conductor W1 of the electric wire. Dig into. Here, as described above, since the grooves G1 and G2 are formed at the portions which are the both side portions in the width direction of the bottom plate portion 21 which is the base of the conductor crimping pieces 23A and 23B, the fixing force is increased in accordance with the suppression of the spring back. Increase. Thereby, compared with the first half process of the crimping crimping process of FIGS. 5 (A) to (C), the crimp terminal 10 is pushed and bent in the left-right direction, and its height is higher than H1 (see FIG. 5 (C)). It changes to a flat shape that is kept low to a height H2 (however, H1> H2). As a result, as shown in FIG. 1 (B), there is no gap between the wire barrels V1 and V2 made of the conductor crimping pieces 23A and 23B and the core wire W1 of the electric wire W, and a reliable and stable crimped state. Can be realized. As a result, troubles such as occurrence of a gap between the conductor crimping portion 23 and the conductor W1 of the electric wire to cause an electrical contact failure can be suppressed, and a highly reliable crimping structure can be provided.

  By the way, in a normal crimping operation, even if a springback occurs during crimping, the conductor crimping pieces 23A and 23B can be crimped without a gap between the conductor W1 and the core wire W1 due to elastic deformation of the core wire W1. When a material with little elastic deformation is used, or when crimping to a portion formed of a resin material, a gap is generated between the conductor crimping pieces 23A and 23B and the core wire W1 of the electric wire W unless the spring back is suppressed. Therefore, there is a possibility that a reliable and stable crimped state cannot be realized. In this regard, according to the above-described crimping structure of the present embodiment, the generation of springback can be effectively suppressed by forming the grooves G1 and G2 to reduce the thickness, so that even a material with less elastic deformation can be used. A reliable and stable crimped state can be realized.

  Further, according to the crimping structure of the present embodiment, the conductor crimping pieces 23A and 23B are not formed with the thin-walled grooves G1 and G2 until immediately before the crimping process. Even if some external force is applied to the crimp terminal 10 or the like, a deformation or the like in the vicinity of the grooves G1 and G2 is not caused, and a good shape can be maintained until the crimping work is performed. As a result, a predetermined good crimping process can be performed during the crimping operation.

  In addition, according to the pressure-bonding structure of the present embodiment, the bottom plate portion 21 that is most prone to spring back is formed by forming the thin portions that are the grooves G1 and G2 at the portions that are both side portions in the width direction of the bottom plate portion 21. The amount of displacement at the joint between the conductor crimping pieces 23A and 23B can be effectively reduced.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.
For example, in the present embodiment, as shown in FIG. 1A, in addition to the pair of conductor crimping portions 23 erected and continuous from both sides of the bottom plate portion 20, an electrical contact portion 22 in which an insulator crimping portion 24 is formed. Although the crimping structure of the crimping barrel of the present invention is applied to the crimping terminal 10 having the above, the present invention is not limited to this. That is, the crimping structure of the crimping barrel of the present invention may be applied to a “bare crimping sleeve” in which only the conductor crimping portion is provided on the bottom plate portion, that is, constituted by only the barrel.

  Moreover, although the groove | channel was provided in this embodiment, you may provide a hollow instead of a groove | channel in the crimping | compression-bonding structure of this invention. Furthermore, in this embodiment, the groove is continuously formed from one end to the other end along the axial direction of the crimping barrel, but the groove or the recess is a bottom plate along the axial direction of the conductor crimping portion. The structure formed discontinuously from one end to the other end of the part may be used.

(A) is a perspective view which shows the structure of the principal part of the crimp terminal and electric wire for obtaining the crimp structure of 1st Embodiment of this invention, (B) is the perspective view which shows the state after crimping | bonding the said crimp terminal to the electric wire. FIG. (A) is a fragmentary perspective sectional view which shows the principal part of the same embodiment, (B) is a fragmentary perspective sectional view in the state which turned the principal part upside down. It is a perspective view which shows the structure of the principal part of the crimper and anvil which are used by this invention. (C) is explanatory drawing which shows the operation | work process until just before crimping the said crimp terminal to an electric wire. (A)-(C) is explanatory drawing which shows the first half operation process when crimping | bonding the said crimp terminal to an electric wire. (A)-(C) is explanatory drawing which shows the latter half work process when crimping | bonding the said crimp terminal to an electric wire. It is sectional drawing for demonstrating the conventional crimping | compression-bonding structure. (A) is a perspective view for demonstrating the crimp terminal used for another conventional crimp structure, (B) is a perspective view which shows the state after crimping the crimp terminal to the electric wire.

Explanation of symbols

10 Crimping terminal 20 Bottom plate part 23 Conductor crimping part 23A, 23B Conductor crimping piece (wire barrel)
30 Crimper 40 Anvil 42 Protrusion G1, G2 Groove V1, V2 Wire barrel W Electric wire W1 Conductor W2 Insulation coating

Claims (3)

The bottom plate portion is extended upward from the right and left side edges in the width direction of the bottom plate portion, and is bent inward so as to wrap the conductor of the electric wire to be connected, so that the conductor is crimped to the upper surface of the bottom plate portion. A crimping structure of a crimping barrel including a conductor crimping portion having a plurality of conductor crimping pieces, and crimping the conductor by the conductor crimping portion,
Continuously along the axial direction of the conductor placed on the bottom plate portion, on the outer side of the bottom plate portion where the conductor crimping piece is bent by crimping, at both side portions in the width direction of the bottom plate portion. The crimping structure of the crimping barrel is characterized in that a groove to be formed is formed and a thin portion is formed in the bottom plate portion.   A crimp terminal comprising at least a part of the barrel having the crimp structure according to claim 1. A crimping apparatus for crimping the crimping barrel according to claim 1 and the conductor,
On the anvil on which the lower surface of the bottom plate portion is placed, a protrusion is formed at a position facing the portion where the groove is to be formed in the bottom plate portion when the conductor is crimped by the conductor crimping portion. ,
A crimping device characterized by that.

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