JP2005190941A - Shield connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield connection structure capable of obtaining an enough contact load of a shield braid and a barrel without adverse effects such as cross-section deformation on inside core wires at the time of a calking process of the shield braid by the barrel at a crimping part of an outer conductive shell of a shield connector, in case of shield connection of a terminal part consisting of a plurality of core wires, shield braid covering an outside of the core wires, and a sheath covering an outside of the braid with an outer conductor shell of a shield connector. <P>SOLUTION: A cylindrical ring is inserted into an inside position of the shield braid exposed by peeling of the sheath of a terminal part of the shield cable, and the barrel of the crimping part the outer conductor shell has is put under a calking process on the shield braid at a part where the cylindrical ring is inserted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an automobile wire harness, and more particularly to a shield connection structure between a shielded cable such as a shielded twisted pair electric wire, which is a transmission cable used in a LAN system mounted on a vehicle, and a connector.

  In general, a twisted pair electric wire called STP (shielded twisted pair), which is provided with a shield braid, is formed by twisting two single-core wires. The feature is that the influence of electromagnetic induction can be reduced by reversing the direction of the magnetic field generated by the adjacent wire loops formed by this twisted twist and canceling each other's generated magnetic field. In this case, it is known that the shield braid further covers the outside, so that it is difficult to radiate electromagnetic induction noise to the outside and it is difficult to receive noise from the outside, and it is widely used as a LAN cable for high-speed transmission.

  Usually, such shielded twisted-pair electric wires are processed by terminal processing and connected to a dedicated connector called a modular connector. Recently, electric devices mounted on automobiles such as car navigation systems have been used with such shielded twisted-pair electric wires. May constitute a vehicle loading network.

  As a shield connection structure between the shield braid of the shield twisted pair electric wire and the outer conductor shell of a shield connector usually used in an automobile or the like, for example, there is one disclosed in Patent Document 1 below.

ACT 7-18379

  In the shield connection structure of Patent Document 1, the crimping barrel included in the outer conductor shell is crimped from the shield braid exposed by peeling the sheath. However, if the crimping is performed with strong pressure, the twisted core wire on the inside is removed. This will cause the high frequency characteristics to deteriorate. For this reason, the caulking pressure must be reduced, resulting in a problem that the pull-out strength of the connector with respect to the electric wire is weak and a contact load sufficient to satisfy connection reliability sufficient for use in a vibrating vehicle such as an automobile. There was no problem.

  Therefore, the problem to be solved by the present invention is to obtain a sufficient contact load between the shield braid and the barrel without affecting the core wire, such as cross-sectional deformation, when crimping the shield braid by the barrel of the crimp portion of the outer conductor shell. It is to provide a shield connection structure that can be used.

  In order to solve the above problems, a shield connection structure according to the present invention includes a terminal portion of a shield cable comprising a plurality of core wires, a shield braid covering the outside of the core wires, and a sheath covering the outside, and an outer conductor shell of the shield connector. The cylindrical ring is inserted into the shield braid exposed inside the shield braid at the shield cable end portion, and the shield of the portion where the cylindrical ring is inserted The gist of the invention is that the barrel of the crimping portion of the outer conductor shell is crimped on the braid.

  Further, the shield connection structure according to the present invention is a shield connection structure between a terminal portion of a shielded cable and a shield connector outer conductor shell comprising a plurality of core wires, a shield braid covering the outside of the core wires, and a sheath covering the outside. A reversing portion in which a cylindrical ring is attached to an outer position of the shield braid exposed by peeling the sheath of the shield cable end portion, and the shield braid is folded and reversed on the cylindrical ring. The gist of the invention is that the barrel of the crimping portion provided in the outer conductor shell is crimped on the shield braid of the reversal portion.

  In this case, a second barrel different from the barrel is further provided in the crimping portion of the outer conductor shell, and the second barrel is caulked on the sheath in a portion not peeled off. good.

  According to the invention of the shield connection structure having the above-described configuration, the cylindrical ring is inserted into the inner position of the shield braid exposed by peeling the sheath of the shield cable terminal portion, and the portion where the cylindrical ring is inserted is inserted. The barrel of the crimping portion of the outer conductor shell on the shield braid is crimped, or a cylindrical ring is attached to the outer position of the shield braid exposed by peeling the sheath of the shield cable end portion, and the tubular A reversing part is formed by turning the shield braid on the ring and the barrel of the crimping part of the outer conductor shell is crimped on the shield braid of the reversing part. Get sufficient connection reliability between shield braid and crimp barrel without affecting cross section deformation It is possible. In this case, the caulking process on the reversing portion prevents the cable from being pulled out by pulling.

  Further, a second barrel different from the caulked barrel of the shield braid is provided at the crimping portion of the outer conductor shell, and the second barrel is caulked on the sheath of the part not peeled off. By doing so, the influence on the shield connection portion due to external forces such as bending and twisting of the cable is reduced.

  Embodiments of a shield connection structure according to the present invention will be described below with reference to the drawings. The shield connection structure according to this embodiment is applied to a so-called multi-core shielded cable having a large number of core wires, and in this embodiment, a case where it is applied particularly to a two-core shielded twisted pair electric wire having two core wires will be described. To do. FIG. 1 shows a cross-sectional view of the shield connection structure according to the first embodiment.

  As shown in FIG. 1, the shield connector 1 connected to the terminal portion of the shield twisted pair electric wire W includes an inner conductor terminal 2, a dielectric 3, an outer conductor terminal 4, and a cylindrical ring 5.

  The inner conductor terminal 2 is connected to the conductor Wb of the core wire Wa of the shielded twisted pair electric wire W and transmits a high-frequency signal, and has a so-called female type terminal shape. The dielectric 3 that accommodates the inner conductor terminal 2 is used to insulate between the conductor terminals of the inner conductor terminal 2 and the outer conductor terminal 4 and is formed by a resin insulating member having a predetermined dielectric constant. The inner conductor terminal 2 is inserted and fixed from behind. Further, a flange portion 3 a is provided at the front end of the dielectric 3, and abuts on the front end of the outer conductor terminal 4 that is open.

  The outer conductor terminal 4 is connected to the shield braid Wd of the shield twisted pair electric wire W, covers the periphery of the inner conductor terminal 2 and electromagnetically shields it. The outer conductor terminal 4 includes a main body portion 4a formed in a hollow shape that is opened in the front and rear by bending a conductive plate material, and the dielectric 3 can be accommodated in the main body portion 4a. In addition, a crimping part 4b extending rearward of the main body part 4a is provided. A braided crimping barrel 4c that is caulked on the shield braid Wd that is placed on the front side of the crimping part 4b, and a rear side thereof The sheath crimping barrel 4d is formed on the sheath We by crimping. In this case, the outer conductor terminal 4 is electrically connected to the shield braid Wd by the braid crimp barrel 4c.

  The cylindrical ring 5 located inside the exposed shield braid Wd in the figure is formed of a metal material or a hard resin material, and has a cylindrical shape opened in the front and rear, and its inner diameter is The twisted core wires Wa and Wa are formed so as to be inserted, and the outer diameter thereof is formed so as to be inserted inside the shield braid Wd exposed by peeling the sheath We. As shown in the drawing, when the cylindrical ring 5 is inserted into the shield braid Wd and then caulked by the braid crimping barrel 4c, the outer periphery of the cylindrical ring 5 receives caulking pressure. The twisted core wires Wa and Wa are not affected by cross-sectional deformation or the like. As a result, a strong caulking pressure can be applied, so that the shield braid Wd and the braided crimping barrel 4c having good connection reliability are brought into contact with each other. Moreover, since the sheath We is peeled off at the portion to be crimped by the braided crimp barrel 4c, the increase in the outer diameter of this portion can be suppressed by inserting the cylindrical ring 5.

  Next, a shield connection structure according to the second embodiment will be described with reference to FIG. Since this shield connection structure is different from the structure of the first embodiment of FIG. 1 only in the positional relationship between the cylindrical ring and the shield braid, the same components are denoted by the same reference numerals and description thereof is omitted. The explanation will focus on the different points.

  The cylindrical ring 6 shown in FIG. 1 is different from the cylindrical ring 5 in FIG. 1 in the inner and outer diameters, and the inner diameter is such that the shield braid Wd exposed by peeling the sheath We can be inserted. The outer diameter is formed substantially equal to the outer diameter of the sheath We. Accordingly, as shown in the drawing, after the shield braid Wd is inserted inside, the shield braid Wd is folded and reversed to form the reversal portion 7 on the outer periphery of the cylindrical ring 6, and the braid crimping barrel is formed on the reversal portion 7. The caulking process by 4c is performed. As a result, as in the first embodiment described above, the outer periphery of the cylindrical ring 6 is subjected to caulking pressure, so that the inner twisted core wire is not affected by cross-sectional deformation or the like, and further, due to tension. It is a shield connection structure with high connection reliability that prevents the cable from coming off.

  As mentioned above, although the embodiment of the shield connection structure according to the present invention has been described, the present invention is not limited to these examples, and can be implemented in various modes without departing from the gist of the present invention. Of course. For example, in the embodiment, the shielded cable has been described using a shielded twisted pair electric wire having a pair of twisted pair core wires. Needless to say, the shield connector can be applied to both male and female connectors.

It is the figure which showed the cross section of 1st Embodiment of the shield connection structure which concerns on this invention. It is the figure which showed the cross section of 2nd Embodiment of the shield connection structure which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield connector 2 Inner conductor terminal 3 Dielectric body 3a Flange part 4 Outer conductor terminal 4a Body part 4b Crimp part 4c Braid crimp barrel 4d Sheath crimp barrel 5, 6 Cylindrical ring 7 Inversion part W Shield twisted pair electric wire Wa Core wire Wb Conductor Wd Shield Braided We sheath

Claims (3)

  A shield connection structure between a shield cable end portion and a shield connector outer conductor shell, comprising a plurality of core wires, a shield braid covering the outside of the core wires, and a sheath covering the outside, and the shield cable end portion A cylindrical ring is inserted into an inner position of the shield braid exposed by the sheath peeling, and a barrel of the crimping portion provided in the outer conductor shell is caulked on the shield braid of the portion where the cylindrical ring is inserted. Shield connection structure characterized by being processed.   A shield connection structure between a shield cable end portion and a shield connector outer conductor shell, comprising a plurality of core wires, a shield braid covering the outside of the core wires, and a sheath covering the outside, and the shield cable end portion A cylindrical ring is attached to the outer position of the shield braid exposed by the sheath peeling, and a reversal portion is formed on the cylindrical ring by turning the shield braid back and reversed. A shield connection structure, characterized in that a barrel of a crimping portion included in the outer conductor shell is crimped on a braid.   The crimping portion of the outer conductor shell is provided with a second barrel that is different from the barrel, and the second barrel is crimped on the sheath in a portion not peeled off. The shield connection structure according to claim 1 or 2.

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