JP2008181810A - Shield terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield terminal in which a shield wire terminal part can be crimped without causing a positional shift in the front and rear direction, and down-sizing can be promoted. <P>SOLUTION: Since in a barrel piece 34 of the external conductor 30, a braided wire crimping part 34A and a sheath crimping part 34B are integrally formed without leaving spacing in the front and rear direction, length size of the external conductor 30 in the front and rear direction becomes smaller compared with a case in which gaps are installed between both crimping parts in order to prevent the positional shift of the shield wire 40, thus the down-sizing of the shield terminal 1 can be promoted. Moreover, when the terminal part of the shield wire 40 is arranged at a prescribed position, a contacting fringe 38A of the external conductor 30 comes to contact the front fringe 44A of the sheath 44, thus positioning of the terminal part of the shield wire 40 is made. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shield terminal used by being connected to a terminal portion of a shielded electric wire.

Conventionally, for example, a shield terminal disclosed in Patent Document 1 is known as a connector that is used by being connected to a terminal portion of a shielded electric wire peeled in stages so that a core wire and a shield layer are exposed. The shield terminal includes an inner conductor that is crimped to a core wire and an outer conductor that can accommodate the inner conductor with a dielectric interposed.
The rear end portion of the outer conductor is provided with a wire barrel portion that is crimped to the braided wire (shield layer) and an insulation barrel portion that is crimped to a sheath that covers the outer periphery of the braided wire. The barrel portion is arranged at a predetermined interval in the front-rear direction. When the outer conductor is crimped to the end portion of the shielded electric wire, the end portion of the shielded electric wire is moved back and forth by observing the boundary between the braided wire and the sheath from the gap between the wire barrel portion and the insulation barrel portion. It is possible to confirm that the crimping has been performed without being displaced in the direction.
JP 2000-208214 A

By the way, in recent years, there is also a demand for miniaturization as much as possible for the shield terminal as described above. And in said shield terminal, although the position shift of the shield electric wire in the front-back direction can be surely prevented, the terminal is enlarged by the amount of providing a gap between the wire barrel part and the insulation barrel part. Therefore, further ingenuity has been desired.
The present invention has been completed based on the above-described circumstances, and provides a shield terminal that can be crimped without causing the terminal portion of the shielded wire to be displaced in the front-rear direction and can be reduced in size. The purpose is to do.

  As means for achieving the above object, the invention of claim 1 is a shield terminal connected to a terminal portion of a shielded electric wire peeled in stages so that the core wire and the shield layer are respectively exposed. An inner conductor that is crimped to the core wire, and an outer conductor that can accommodate the inner conductor in a state of interposing a dielectric, and the rear end of the outer conductor is shielded from the shield layer. A portion of the sheath covering the outer periphery of the layer is provided with a barrel portion that is wound in the circumferential direction and crimped, and a shield layer crimping portion that is a portion of the barrel portion wound around the shield layer and the sheath A sheath crimping portion that is a portion that is wound around the front end portion, and is integrally formed without a space in the front-rear direction over the circumferential direction, and the outer conductor or dielectric Is characterized at the terminal portion of the shielded wire is positioning portion abutting the same terminal portion or the inner conductor is provided when it is arranged at a predetermined position.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the positioning portion is arranged at a position where it abuts against the front edge of the sheath.

<Invention of Claim 1>
At the rear end portion of the outer conductor, a barrel portion that is wound in the circumferential direction and is crimped on a portion extending from the shield layer to the front end portion of the sheath is provided, and the shield layer that is a portion of the barrel portion that is wound around the shield layer The crimping portion and the sheath crimping portion, which is a portion wound around the front end portion of the sheath, are integrally formed with no space in the front-rear direction over the circumferential direction. As a result, the length of the outer conductor in the front-rear direction can be reduced as compared with the case where a gap is provided between the portion wound around the shield layer and the portion wound around the sheath, thereby reducing the size of the shield terminal. be able to.
In addition, the shield wire is positioned by the positioning portion provided in the outer conductor or the dielectric contacting the terminal portion or the inner conductor of the shield wire arranged at a predetermined position.
Therefore, the terminal portion of the shielded wire can be crimped without being displaced in the front-rear direction, and the shield terminal can be downsized.

<Invention of Claim 2>
The positioning part comes into contact with the front edge of the sheath. Here, for example, if the positioning portion comes into contact with the inner conductor, the core wire crimped to the inner conductor may be deformed or the like when it comes into contact with vigor. However, according to the structure of this invention, such a situation can be avoided and the terminal part of a shielded electric wire can be positioned reliably.

Embodiments of the present invention will be described below with reference to FIGS.
The shield terminal 1 in the present embodiment is used by being connected to the terminal portion of the shielded electric wire 40. In the following, each component will be described with the left side of FIG. 1 as the front, the right side as the rear, the upper side as the upper side, and the lower side as the lower side.
The shielded electric wire 40 includes a core wire 41, an insulating layer 42 covering the outer periphery of the core wire 41, a braided wire 43 (corresponding to the shield layer of the present invention) surrounding the outer periphery of the insulating layer 42, and the braided wire 43. And a sheath 44 that covers the outer periphery of the substrate. The terminal portion of the shielded electric wire 40 is peeled in stages so that the core wire 41 and the braided wire 43 are exposed. In addition, the braided wire 43 is formed by weaving a conductive fine metal wire.

  The shield terminal 1 includes an inner conductor 10 connected to the core wire 41 of the shielded electric wire 40. The inner conductor 10 is formed by bending a conductive metal plate material punched into a predetermined shape. The inner conductor 10 is formed in a female terminal shape, and includes a connecting portion 11 having a rectangular tube shape into which a tab (not shown) of a mating inner conductor formed in a male terminal shape can be inserted.

  An engagement piece 12 that can be engaged with a dielectric 20 described later is provided at the rear end of the connection portion 11. The engagement piece 12 has a shape that is inclined upward (outside of the connection portion 11) toward the rear. Further, a core wire crimping portion 13 for crimping the core wire 41 of the shielded electric wire 40 is provided behind the connection portion 11.

  The shield terminal 1 includes an outer conductor 30 that can accommodate the inner conductor 10 crimped to the core wire 41 with the dielectric 20 interposed. The outer conductor 30 is formed by bending a conductive metal plate punched into a predetermined shape. The outer conductor 30 includes a main body 31 that can accommodate the dielectric 20.

  The main body 31 has a substantially cylindrical shape into which the dielectric 20 can be inserted from the front, and a metal lance 32 formed by cutting and raising is formed at the rear end. The metal lance 32 has a shape that is inclined inward of the main body 31 toward the rear. Further, a stopper 33 is provided at the rear end of the main body 31 to restrict the rearward movement of the dielectric 20 by coming into contact with the restriction surface 26 formed at the rear end of the dielectric 20 from the rear. ing.

  The dielectric 20 accommodated in the main body 31 is mounted between the inner conductor 10 and the outer conductor 30 to electrically insulate the two conductors 10 and 30 from each other. The dielectric 20 is formed in a generally thick, generally cylindrical shape from an insulating material such as synthetic resin, and the inside thereof is a housing portion 21 in which the inner conductor 10 is housed. A plug-in space 22 into which a mating outer conductor (not shown) is inserted is secured between the main body 31 and the dielectric 20.

  An engagement hole 23 that can be engaged with the engagement piece 12 of the inner conductor 10 is formed in the vertical direction in the position close to the rear end of the dielectric 20. A restricting surface 26 is formed. Further, an engagement protrusion 24 that can engage with the metal lance 32 of the outer conductor 30 is provided at the rear end of the dielectric 20. Note that a tab insertion opening 25 is formed at the front end of the dielectric 20 so that the mating tab can be inserted into the accommodating portion 21.

  A barrel portion 35 is provided at the rear end portion of the outer conductor 30 and is wound around and crimped to a portion extending from the braided wire 43 at the end portion of the shielded electric wire 40 to the front end portion of the sheath 44 in the circumferential direction. The barrel portion 35 is connected to the rear end of the main body portion 31 via a connecting portion 37.

  The barrel portion 35 includes a pair of left and right barrel pieces 34. Each of the pair of barrel pieces 34 has a single plate shape, and has a width dimension in the front-rear direction capable of crimping a range extending between the braided wire 43 and the front end portion of the sheath 44 in the end portion of the shielded electric wire 40. The width dimension in the front-rear direction is approximately twice the dimension in the front-rear direction of the exposed portion of the braided wire 43. The barrel piece 34 is disposed across the boundary line between the braided wire 43 and the sheath 44, and is crimped to the braided wire 43 and the sheath 44 by a substantially equal range.

  A substantially first half portion of both barrel pieces 34 is a braided wire crimping portion 34A (corresponding to the shield layer crimping portion of the present invention) which is wound around the braided wire 43 in the circumferential direction and is crimped. The portion is also a sheath crimping portion 34B that is wound around the sheath 44 in the circumferential direction and crimped. That is, the barrel piece 34 has a shape in which the braided wire crimping portion 34A and the sheath crimping portion 34B are formed integrally with each other in the circumferential direction without a space in the front-rear direction.

  As shown in FIG. 2, both barrel pieces 34 extend upward from the bottom wall 36 of the barrel portion 35 with substantially the same length, and the upper side is opened before connection with the shielded electric wire 40. It is substantially U-shaped. Both barrel pieces 34 have a length dimension that allows caulking by so-called overlap crimping, in which, when the caulking with respect to the shielded electric wire 40 is performed, the tip portions overlap each other by a predetermined length range.

  And the front-end | tip part of each barrel piece 34 is made into the shape where a substantially latter half part protrudes upwards rather than a substantially front half part. That is, in each barrel piece 34, the sheath crimping portion 34B has a circumferential length greater than that of the braided wire crimping portion 34A. As a result, the sheath crimping portion 34B of the barrel piece 34 is sufficiently firmly caulked with respect to the surface of the sheath 44 without being insufficient in the circumferential length, and the braided wire crimping portion 34A is circumferentially long. The dimension is set to be a reasonable dimension with no excess and no waste.

  A hammering portion 38 is provided on the bottom wall 36 of the barrel portion 35. The hitting portion 38 cuts the cut along the front edge 44A at a position corresponding to the front edge 44A of the sheath 44 on the bottom wall 36 (approximately the center position in the front-rear direction of the barrel portion 35). It is formed by knocking out the front part upward. The hitting portion 38 is provided at a portion of the bottom wall 36 corresponding to the braided wire crimping portion 34A and has a shape protruding upward (side on which the shielded electric wire 40 is disposed), and the upper surface thereof is braided in the front-rear direction. It comes in contact with the line 43. The projecting dimension of the hitting portion 38 from the bottom wall 36 is substantially the same as the thickness dimension of the sheath 44.

  The rear end edge of the knocking portion 38 is disposed at a position shifted upward from the bottom wall 36, and the terminal portion of the shielded electric wire 40 is inserted from the rear between the pair of barrel pieces 34 and disposed at a predetermined position. Then, the front edge 44A of the sheath 44 can come into contact. The rear end edge of the hitting portion 38 is a contact edge 38A corresponding to the positioning portion of the present invention.

Next, the operation and effect of the present embodiment configured as described above will be described.
In order to attach the shield terminal 1 to the terminal portion of the shielded electric wire 40, first, the sheath 44 of the terminal portion of the shielded electric wire 40 is peeled to expose the braided wire 43, and the insulating layer 42 is peeled to expose the core wire 41. The core wire crimping portion 13 of the inner conductor 10 is crimped to the core wire 41 by crimping (see FIG. 1).

  On the other hand, the dielectric 20 is attached to the main body 31 of the outer conductor 30. When the dielectric 20 is inserted into the outer conductor 30 from the front and pushed into a predetermined position, the engagement protrusion 24 of the dielectric 20 gets over the metal lance 32 and the metal lance 32 is restored and deformed. By engaging with the portion 24 from the front, the forward movement of the dielectric 20 is restricted. Further, the restricting surface 26 of the dielectric 20 abuts against the stopper 33 of the main body 31, and further rearward insertion is restricted. Thus, the dielectric 20 is positioned and mounted at a predetermined position in the main body 31 of the outer conductor 30.

  After that, when the inner conductor 10 connected to the shielded electric wire 40 is inserted into the accommodating portion 21 of the dielectric 20 from the rear and pushed into a predetermined position (a position slightly before the regular accommodating position), the inner conductor 10 The engagement piece 12 enters the engagement hole 23 of the dielectric 20 and elastically returns to engage with the engagement hole 23. Thereby, the inner conductor 10 is prevented from coming off from the accommodating portion 21.

  When the shielded electric wire 40 is further pushed in, the front edge 44A of the sheath 44 abuts against the abutting edge 38A just before the front surface of the inner conductor 10 hits the front wall of the housing portion 21, and further pushing of the shielded electric wire 40 is restricted. (See FIG. 3). In this way, the terminal portion of the shielded electric wire 40 has the inner conductor 10 completely accommodated in the accommodating portion 21 of the dielectric 20, and the braided wire 43 and the front end portion of the sheath 44 are displaced in the front-rear direction with respect to the barrel portion 35. Positioning is performed at a normal position (the boundary between the braided wire 43 and the sheath 44 is located at the center in the front-rear direction of the barrel portion 35).

  In this manner, with the terminal portion of the shielded electric wire 40 positioned at a predetermined position with respect to the shield terminal 1, the whole is mounted on a crimping machine (not shown), and both barrel pieces 34 are portions of the portion extending from the braided wire 43 to the front end portion of the sheath 44. Overlap crimping is performed along the outer peripheral surface. Then, both barrel pieces 34 are wound around the braided wire 43 and the front end portion of the sheath 44 at a time, and are firmly crimped. As described above, according to the configuration of the present embodiment, positioning can be performed without visually confirming a positional deviation in the front-rear direction between the terminal portion of the shielded electric wire 40 and the shield terminal 1. The terminal portion can be crimped without being displaced in the front-rear direction.

Since the substantially first half portion (braided wire crimping portion 34A) of the barrel piece 34 crimps the braided wire 43 and the substantially latter half portion (sheath crimping portion 34B) crimps the sheath 44, for example, the barrel piece is only the braided wire 43. Compared to the case where only crimping is performed, the holding power of the shield terminal 1 with respect to the shielded electric wire 40 is reliably improved.
Further, since the barrel piece 34 caulks the braided wire 43 and the sheath 44 at a ratio of approximately half, the fixing force to the shielded electric wire 40 acts in a well-balanced manner.

  In the present embodiment, the rear edge of the hitting portion 38 is the abutting edge 38A. For example, the abutting edge is formed in a cantilever shape by cutting and raising, and is behind the cut and raised piece. In the case of an edge, if the front edge 44A of the sheath 44 abruptly contacts the contact edge, the cut and raised piece may be deformed forward, and accurate positioning may not be achieved. However, since the abutting edge 38A is the rear edge of the hitting portion 38, even if the front edge 44A of the sheath 44 abuts vigorously, it is unlikely to be deformed or the like, and the shielded electric wire 40 is surely secured. Is positioned at a normal position.

  Furthermore, since the front edge 44A of the sheath 44 comes into contact with the contact edge 38A immediately before the front surface of the inner conductor 10 hits the front wall of the housing portion 21, the inner conductor 10 contacts the front wall of the housing portion 21. It is possible to prevent the core wire 41 from buckling and the like by striking vigorously.

  As described above, according to the present embodiment, the barrel portion 35 of the outer conductor 30 is formed such that the braided wire crimping portion 34A and the sheath crimping portion 34B are integrated with no gap in the front-rear direction. The length of the outer conductor 30 in the front-rear direction is smaller than that in the case where a gap is provided between the two crimping parts in order to prevent the positional deviation of the shielded electric wire 40, thereby reducing the size of the shield terminal 1. Can do.

Further, when the terminal portion of the shielded electric wire 40 is disposed at a predetermined position, the contact edge 38A of the outer conductor 30 contacts the front edge 44A of the sheath 44, thereby positioning the terminal portion of the shielded electric wire 40.
Therefore, the terminal portion of the shielded electric wire 40 can be crimped without being displaced in the front-rear direction, and the shield terminal 1 can be downsized.

  The barrel portion 35 has a single plate shape in which the braided wire crimping portion 34A and the sheath crimping portion 34B are integrated, and the shape thereof is very simple, so that it is easy to manufacture.

  Further, the contact edge 38 </ b> A comes into contact with the front edge 44 </ b> A of the sheath 44. Here, for example, when the contact edge comes into contact with the inner conductor 10, there is a possibility that the core wire 41 crimped to the inner conductor 10 may be deformed or the like if the contact edge is vigorously contacted. However, according to the structure of this embodiment, such a situation can be avoided and the terminal part of the shielded electric wire 40 can be positioned reliably.

<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.

  (1) In the above embodiment, the method of pressure bonding of the barrel piece 34 is overlap pressure bonding (wrap-type pressure bonding), but is not limited to this, and for example, the upper end of the barrel piece is brought into contact with each other and crimped. It may be a heart-shaped crimp.

  (2) In the above embodiment, the end portion of the shielded electric wire 40 is positioned by the front edge 44A of the sheath 44 contacting the contact edge 38A (positioning portion). Although care is required not to cause deformation or the like of the core wire during attachment, positioning may be performed by a part of the inner conductor abutting against a positioning portion formed on the outer conductor or dielectric.

(3) In the above embodiment, the shield layer is the braided wire 43, but the present invention is not limited to this, and any shield layer may be used as long as it has a shield function.
(4) In the above embodiment, the inner conductor 10 is formed in a female terminal shape, but the present invention can be applied even if the inner conductor is in a male terminal shape.

  (5) In the above-described embodiment, the barrel portion 35 is crimped to the braided wire 43 that is still covered with the insulating layer 42. However, the present invention is not limited to this, and the braided wire is reversed to the outer peripheral side of the sheath. It may be in a state where it is crimped to the inverted part of the braided wire and the rear part of the sheath that is covered with the braided wire.

Side sectional drawing showing the state before the shield terminal in embodiment of this invention is attached to the terminal part of a shielded electric wire Sectional view showing the shape of the hammer Side sectional view showing the state where the end of the shielded wire is positioned with respect to the shield terminal Side sectional view showing the state where the shield terminal is attached to the end of the shielded wire

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Shield terminal 10 ... Inner conductor 20 ... Dielectric 30 ... Outer conductor 34A ... Braided wire crimping part (shield layer crimping part)
34B ... Sheath crimping part 35 ... Barrel part 38A ... Contact edge (positioning part)
40 ... shielded wire 41 ... core wire 43 ... braided wire (shield layer)
44 ... sheath 44A ... front edge of sheath

Claims (2)

A shield terminal connected to a terminal portion of a shielded wire peeled in stages so that the core wire and the shield layer are exposed,
An inner conductor that is crimped to the core wire, and an outer conductor that can accommodate the inner conductor with a dielectric interposed therebetween,
The rear end portion of the outer conductor is provided with a barrel portion that is wound in the circumferential direction and crimped to a portion extending from the shield layer to the front end portion of the sheath covering the outer periphery of the shield layer,
Of the barrel portion, a shield layer crimping portion that is a portion that is wound around the shield layer and a sheath crimping portion that is a portion that is wound around the front end portion of the sheath are integrated with no gap in the front-rear direction over the circumferential direction. And being formed,
The shield terminal, wherein the outer conductor or the dielectric is provided with a positioning portion that comes into contact with the end portion or the inner conductor when the end portion of the shielded electric wire is arranged at a predetermined position. The shield terminal according to claim 1, wherein the positioning portion is disposed at a position where the positioning portion abuts on a front edge of the sheath.

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