JP2006244815A - Structure of barrel part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a barrel part capable of preventing opening of the barrel part even in case external force is added to an electric wire. <P>SOLUTION: The barrel part 26 of a terminal fitting 20 consists of a pair of caulking pieces 26A, 26B. A locking protrusion 28 is provided in the vicinity of a tip part of one of the caulking pieces 26A, and a rest hole 29 capable of locking with the locking protrusion 28 in the vicinity of a tip part of the other caulking piece 26B. In case the barrel part 26 is caulked on the electric wire 10, the barrel 26 is prevented from opening by locking of the locking protrusion 28 to the rest part 29. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure of a barrel portion for caulking an electric wire.

  Conventionally, as a structure of a barrel portion, for example, the one of the following Patent Document 1 is known. A terminal fitting connected to the end of the shielded electric wire is accommodated inside the connector housing of the shielded connector. The connection structure between the electric wire end and the terminal fitting is usually made as shown in FIG. Met.

That is, a barrel portion 3 formed of a pair of caulking pieces for caulking the shielded electric wire 2 is provided at the rear end portion of the terminal fitting 1. On the other hand, the braided wire 4 (shield layer) is reversed on the outer sheath 5 at the end of the shielded electric wire 2, and the inverted portion of the braided wire 4 is caulked by the barrel portion 3 described above, thereby A connection was made.
JP-A-7-263082

  However, in the so-called overlap crimping in which the tip ends of a pair of caulking pieces are simply overlapped with each other like the barrel portion 3 described above, the barrel portion 3 can be easily moved when a tensile force is applied to the electric wire 2. There exists a problem that it will spread and the electric wire 2 will come off from the terminal metal fitting 1. FIG. In order to prevent the electric wire 2 from coming off, it is conceivable to increase the compressive strength of the barrel portion 3. For example, in the case of caulking the braided wire 4 as described above, the cushioning property of the braided wire 4 is sufficient. There is a concern that the caulking power is not sufficiently transmitted. At first, the method in which the end of the caulking piece protrudes from the outer surface of the electric wire 2 is not applicable because it may break through the braided wire 4 and the outer sheath 5 and short-circuit the core wire. In the above, the terminal fitting 1 is attached by caulking at one place on the braided wire 4, but caulking on the outer sheath 5 is further added, that is, by caulking at two places. . However, such a method is not advantageous because it enlarges the terminal fitting 1 itself.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a structure of a barrel portion that can prevent a caulking piece from opening even when an external force is applied to an electric wire.

  As means for achieving the above object, the invention of claim 1 is a structure of a barrel portion for caulking an electric wire by a pair of caulking pieces, and one caulking piece of the pair of caulking pieces includes A locking projection is provided, and the other caulking piece is engaged with the locking projection in a state where the barrel portion is caulked to the electric wire, so that the both caulking pieces are opened in the opening direction. It is characterized in that a receiving portion for restricting displacement is provided.

  The invention of claim 2 is the structure of the barrel portion according to claim 1, wherein the electric wire is a shielded electric wire in which a core wire is covered with an inner insulating layer, a shield layer, and an outer sheath in order. The shield layer that is exposed from the outer sheath and is reversed and folded outward from the outer sheath is caulked from the outer side.

  Further, the invention of claim 3 is the invention according to claim 1 or claim 2, wherein the two caulking pieces can be caulked to the electric wire in a state in which their tip portions are overlapped inside and outside. The barrel piece located on the inside has a receiving hole, while the barrel piece located on the outside has a locking projection protruding into the receiving hole. .

  According to the first aspect of the present invention, when the electric wire is caulked by the barrel portion, the locking protrusion provided on one caulking piece and the receiving portion provided on the other caulking piece are locked with each other. Since it is a structure, even when an external force is applied to the electric wire in the pulling direction, for example, it is possible to prevent the barrel portion from expanding as in the related art.

  Further, when the above-mentioned electric wire is a shielded electric wire, for example, when the shield layer that is exposed from the outer sheath and reversed to the outside of the outer sheath and folded back is caulked, the compression force of the barrel portion is reduced due to the problem of the core wire being cut. Since it cannot be strengthened, the above-described configuration in which the caulking piece is prevented from being opened by the locking of the locking protrusion and the receiving portion is particularly effective (the invention of claim 2).

  Furthermore, in order to reinforce the caulking situation with respect to the electric wire, the tip of the caulking piece may be simply pushed against the outer peripheral surface of the electric wire. However, when such a case is not permitted, a so-called overlap crimping form in which the ends of both the caulking pieces are overlapped inside and outside when caulking to the electric wire may be adopted. In this case as well, both the caulking pieces are prevented from being opened by locking by fitting the receiving hole and the locking protrusion, so that even if a pulling force is applied to the electric wire, the terminal fitting is securely held. (Invention of claim 3).

  Hereinafter, an embodiment relating to a terminal fitting to which the structure of the barrel portion of the present invention is applied will be described with reference to FIGS.

  As shown in FIG. 1, the shielded electric wire 10 is formed by covering a core wire 11 formed by bundling a plurality of strands with an internal insulating layer 12, covering the outside with a shield layer 13 made of a braided wire, and further covering the outside with an external sheath. 14 is covered with the structure. At the terminal portion of the shielded electric wire 10, the exposed shield layer 13 is folded back to the outside of the outer sheath 14, and the inner insulating layer 12 is exposed before the folded portion of the shield layer 13. 11 is exposed and extends.

  The terminal fitting 20 includes an outer terminal 21 connected to the shield layer 13, an inner terminal 30 connected to the core wire 11, and a resin dielectric 40 interposed between the inner and outer terminals 21, 30. Yes. The inner terminal 30 includes a tab portion 31 that can be connected to a mating terminal fitting (not shown) at the tip, and a core wire connection portion 32 that is caulked to the core wire 11 is formed at the rear end portion. Further, when the inner terminal 30 is inserted into the dielectric 40 between the tab portion 31 and the core wire connecting portion 32, the inner terminal 30 is fixed by biting into the upper wall in the accommodation hole 41 of the dielectric 40. The biting projection 33 is arranged.

  The dielectric 40 is for electrically insulating the inner terminal 30 and the outer terminal 21, and an accommodation hole 41 for accommodating the inner terminal 30 is formed therein. Further, for fixing to the outer terminal 21, a locking recess 42 is provided at the top, and a contact portion (not shown) is provided at the bottom.

  The outer terminal 21 is provided with a rectangular tube-shaped accommodation portion 22 at the front portion, and a lance 23 that engages with the dielectric member 40 is formed on the ceiling surface thereof by being obliquely cut and raised inwardly. The locking recess 42 can be elastically locked. Further, an abutting piece (not shown) is formed on the bottom surface by being cut and raised inward, and can be brought into contact with the contact portion (not shown) of the dielectric 40. Furthermore, the contact piece 24 which elastically contacts with the other party terminal which is not shown in figure is formed in the right-and-left both sides of the accommodating part 22. As shown in FIG. Furthermore, a pair of stabilizers 25, 25 are formed on the upper edge immediately after the housing portion so as to extend outward in the width direction, and perform guidance when the terminal fitting 20 is inserted into a connector housing (not shown). And the barrel part 26 for performing the connection to the shielded electric wire 10 continues in the back.

  The barrel portion 26 is connected to the rear end portion of the accommodating portion 22 side via a connecting piece 27, extends from the connecting piece 27 in the width direction substantially the same length, and in a state before being connected to the shielded electric wire 10, It consists of a pair of caulking pieces 26A and 26B having an overall U-shape opened upward. When caulking with respect to the shielded electric wire 10 is performed on the barrel portion 26 in the present embodiment, caulking is performed by so-called overlap crimping in which the ends of the both caulking pieces 26A and 26B overlap each other by a predetermined length range.

  In the vicinity of the distal end of one of the pair of caulking pieces 26A and 26B, the caulking piece 26A (the caulking piece located on the outer peripheral side when the overlap crimping is performed as shown in FIG. 3) The stop protrusion 28 is knocked out so as to protrude toward the inner peripheral surface. Further, the barrel portion 27 is aligned with the locking projection 28 when the shield wire 10 is caulked at the tip of the other caulking piece 26B (the caulking piece located on the inner peripheral side when the crimping is performed). The receiving holes 29 that fit together are open in a square shape. Further, the locking projection 28 is set to a knockout amount so that the inner surface side thereof is substantially flush with the surface around the receiving hole when the overlap pressing is performed.

  In addition, the taper surface 26C is formed in the front-end | tip part of both caulking pieces 26A and 26B, respectively. As shown in FIG. 3, both tapered surfaces 26 </ b> C are formed on the outer surface side when positioned on the inner peripheral surface side during crimping, and on the inner surface side when positioned on the outer peripheral surface side.

  Next, the operation of this embodiment will be described. In order to attach the terminal fitting 20 to the terminal portion of the shielded electric wire 10, first, the outer sheath 14 at the end of the shielded electric wire 10 is peeled to expose the shield layer 13, and the shield layer 13 is inverted on the outer sheath 14. Keep it. Further, the inner insulating layer 12 of the shielded electric wire 10 is peeled to expose the core wire 11, and the core wire connecting portion 32 of the inner terminal 30 is crimped thereto by caulking.

  On the other hand, the dielectric 40 is inserted from the front of the accommodating portion 22 of the outer terminal 21. Then, the contact portion comes into contact with the abutting piece (not shown), and the lance 23 is inserted into the locking recess 42, so that the dielectric 40 is positioned in the housing portion 22. Thereafter, when the inner terminal 30 connected to the shielded electric wire 10 is inserted into the accommodation hole 41 of the dielectric 40, the biting protrusion 33 bites into the ceiling surface of the accommodation hole 41 and is fixed.

  Next, the inverted portion of the shield layer 13 in the shielded electric wire 10 is placed on the bottom surface of the barrel portion 26 of the outer terminal 21. In this state, the whole is put on a crimping machine (not shown). Then, overlap pressure bonding is performed so that both barrel pieces 26 </ b> A and 26 </ b> B are along the outer peripheral surface of the shield layer 13. Specifically, the crimping is performed such that the caulking piece 26B provided with the receiving hole 29 of the pair of caulking pieces 26A and 26B is directed to the outer surface of the shield layer 13, and the other caulking piece 26A is covered from above. At this time, the locking projection 28 of the caulking piece 26 </ b> A is aligned and fitted in the receiving hole 29, and the locking projection 28 also presses the shield layer 13.

  Thus, although the outer terminal 21 is caulked to the shielded electric wire 10, the electric wire may be subjected to an external force in the shake direction by pulling or the like thereafter. In such a case, the force in the opening direction is applied to both the caulking pieces 26A and 26B. However, in this embodiment, as shown in FIG. 3, since the locking projection 28 and the receiving hole 29 are in a locked state, both the caulking pieces 26A and 26B are not expanded, and the initial good condition is obtained. The crimped state is maintained as it is.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

  (1) In the above embodiment, the locking protrusion and the receiving hole (receiving portion) are rectangular, but the present invention is not limited to this, and may be other shapes such as a circle.

  (2) In the above embodiment, the receiving part is penetrated in the shape of a hole, but it may be a bottomed hole, and in addition to the opening prevention by fitting such irregularities, a hook claw is formed at one end. In addition, a hooking method may be used in which a portion on which the hook is hooked is formed on the other side.

The exploded perspective view of the shielded electric wire and terminal fitting of one embodiment of the present invention Similarly perspective view when shielded wire and terminal fitting are connected Similarly, a cross-sectional view when the shielded wire and terminal fitting are connected Perspective view when connecting a conventional shielded wire and terminal fitting

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Shield electric wire 11 ... Core wire 12 ... Inner insulating layer 13 ... Shield layer 14 ... Outer sheath 20 ... Terminal metal fitting 21 ... Outer terminal 26 ... Barrel part 26A, 26B ... Caulking piece 28 ... Locking protrusion 29 ... Receiving hole (receiving) Part)
30 ... Inner terminal 40 ... Dielectric

Claims (3)

A structure of a barrel portion for caulking an electric wire with a pair of caulking pieces, wherein one caulking piece of the pair of caulking pieces is provided with a locking projection, and the other caulking piece has the above-mentioned A barrel portion characterized in that a receiving portion for restricting displacement in the opening direction of both the caulking pieces is provided by locking with the locking protrusion in a state where the barrel portion is caulked to an electric wire. Structure. The electric wire is a shielded electric wire in which a core wire is covered with an inner insulating layer, a shield layer, and an outer sheath in order, and a shield layer that is exposed from the outer sheath and is reversed and folded outside the outer sheath. 2. The barrel part structure according to claim 1, wherein the barrel part is caulked from the outside. The two caulking pieces can be caulked to the electric wire with their tip portions overlapped on the inside and outside, and the barrel piece located on the inner side during caulking has a receiving hole opened, while the barrel piece located on the outer side The structure of the barrel part according to claim 1 or 2, wherein a locking projection that fits into the receiving hole and locks is formed to protrude.

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