JP2009054357A - Terminal connection structure of shielded wire and shielded wire with terminal, and manufacturing method of shielded wire with terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal connection structure for a shielded wire, increasing force of fixing a shielded connector to a wire terminal while suppressing reduction of wire diameter by compression of the shielded wire when pressing the shielded connector at the shielded wire terminal, and also to provide the shielded wire with the terminal and a manufacturing method of the shielded wire with the terminal. <P>SOLUTION: At a termination of the shielded wire 12 with a sheath 22 peeled to expose a braid 18 to the outside, an almost cylindrical sleeve 42 is inserted to be disposed within the exposed braid 18 and two pairs of press contact pieces 40 of an outer conductor terminal 26 of the shielded connector 14 are pressed into contact with the outside of the exposed braid 18 to form the connection structure 10 with the exposed braid 18 nipped between the sleeve 42 and the two pairs of press-contact pieces 40 of the outer conductor terminal 26. The shielded wire with the terminal has the connection structure 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a shielded wire terminal connection structure, a terminal-attached shielded wire, and a method of manufacturing a shielded wire with a terminal. The present invention relates to a shielded electric wire with a terminal and a method for manufacturing a shielded electric wire with a terminal.

  In recent years, vehicles such as automobiles, office automation equipment, home appliances, and the like have been improved in performance and multifunction, and accordingly, electrical signals transmitted between devices have been increased in speed and frequency. For transmission of a high-frequency signal, a shielded electric wire in which a signal conductor and a shield conductor are coaxially arranged is often used. Usually, an insulator is interposed between the signal conductor and the shield conductor, and both are insulated. A braid obtained by braiding metal strands in a mesh shape is often used for the shield conductor, and a foamed resin material may be used for the insulator.

  A shield connector is attached to the end of such a shielded wire, the inner conductor terminal of the shield connector is connected to the signal conductor of the shielded wire, and the outer conductor terminal is connected to the shield conductor. At this time, in order to connect the outer conductor terminal to the shield conductor, the end of the shielded wire is crimped by the crimping portion of the outer conductor terminal, so that the shielded wire insulator is formed of a foamed resin material and is easily crushed. It cannot be strongly crimped, and it is difficult to obtain a fixing force between the shielded electric wire and the shield connector. For this reason, normally, a substantially cylindrical sleeve is inserted between the shield conductor and the insulator, so that the insulator is not crushed when the outer conductor terminal is crimped at the end of the electric wire to enhance the fixing force.

  For example, as shown in FIG. 2, Patent Document 1 discloses a shield wire terminal connection structure in which a sleeve is inserted inside a braid at the end of a shielded wire and a shield connector is attached to the end. At the end of this shielded wire, the sheath is peeled off to expose the braid, and a substantially cylindrical sleeve is inserted inside the braid up to the inside of the sheath, and the crimp piece of the outer conductor terminal of the shield connector is connected to the braid of the braid. Crimping is performed at two locations, the outer side and the outer side of the sheath.

JP 2006-147223 A

  However, in the conventional terminal connection structure of a shielded electric wire, the sleeve is compressed when crimping in order to increase the adhesion between the shielded electric wire and the shield connector. As a result, the wire is compressed at the terminal connection part, the wire diameter is reduced, and the ratio of the outer conductor inner diameter to the inner conductor outer diameter is changed, which easily causes signal reflection due to impedance mismatch. It was. On the other hand, there is a problem that the bonding force between the terminal and the wire terminal becomes insufficient when the pressure is weakly applied to the extent that the wire diameter is not reduced in order to match the impedance at the terminal connection portion.

  Therefore, the problem to be solved by the present invention is that when the shield connector is crimped at the end of the shielded wire, the shield wire is compressed and the decrease in the wire diameter is suppressed, and the fixing force between the shield connector and the wire end is reduced. It is providing the manufacturing method of the terminal-connection structure of the shielded electric wire which heightened, and the shielded electric wire with a terminal, and the shielded electric wire with a terminal.

  As a result of intensive studies, the present inventors have found that the crimping force exerted by the crimping piece crimped to the outside of the sheath in the conventional shield wire terminal connection structure contributes to the pullout strength between the shield connector and the wire terminal. Is small, and the contribution to the fixing force between the shield connector and the wire terminal is small. On the other hand, the fixing force between the shield connector and the wire terminal is fixed between the braided shield wire and the outer conductor terminal of the shield connector. Obtaining knowledge that the influence of the wearing force is large, the present invention has been completed.

  That is, the shield wire end connection structure according to the present invention is configured such that the outer periphery of the signal conductor is covered with a shield conductor made of a braid through an insulator and the outer periphery of the braid is covered with a sheath to the end of the shielded wire. A terminal connection structure of a shielded electric wire formed by connecting a shield connector having an outer conductor terminal to be connected, wherein the outer conductor terminal includes a crimping portion having two pairs of crimping pieces to be crimped to the terminal of the shielded wire. The shielded electric wire has a sheath peeled off at the end to expose the braid, and a substantially cylindrical sleeve is inserted and disposed inside the exposed braid, and the outer side of the exposed braid is outside the outer braid. The gist is that two pairs of crimping pieces of the conductor terminal are crimped and the exposed braid is sandwiched between the sleeve and the two pairs of crimping pieces of the outer conductor terminal.

  And the summary of the shielded electric wire with a terminal which concerns on this invention has the said terminal connection structure.

  Furthermore, the method for manufacturing a shielded electric wire with a terminal according to the present invention comprises a terminal of a shielded electric wire, wherein the outer periphery of the signal conductor is covered with a shield conductor made of a braid through an insulator, and the outer periphery of the braid is covered with a sheath. A step of peeling a sheath having a length corresponding to the entire length of the crimping portion of the outer conductor terminal having a crimping portion provided with two pairs of crimping pieces to be crimped to the terminal, and exposing the braid; A step of inserting a substantially cylindrical sleeve inside, and crimping two pairs of crimp pieces of the outer conductor terminal to the outside of the exposed braid so that the exposed braid is connected to the sleeve and the outer conductor terminal. And a step of clamping between the two pairs of crimping pieces.

  The shield wire terminal connection structure according to the present invention includes a substantially cylindrical sleeve that is inserted and arranged inside the exposed braid, with the braid exposed by peeling the sheath at the end of the shield wire, and a shield connector. The outer conductor terminal is sandwiched between two pairs of crimping pieces provided in the crimping portion. That is, conventionally, a crimping piece that has been crimped to the outside of the sheath is crimped to the outside of the braid, and the braid exposed at two locations is sandwiched between the two pairs of crimping pieces and the sleeve.

  Therefore, the fixing force between the shield connector and the wire terminal is larger than the conventional terminal connection structure in which the braid exposed at one location is sandwiched between a pair of crimping pieces and the sleeve and the sheath is crimped at the other location. can do. Therefore, it is possible to obtain a sufficient fixing force while preventing the shielded wire from being compressed too much and reducing the wire diameter.

  And since the shielded electric wire with a terminal concerning the present invention has the above-mentioned terminal connection structure, it is suppressed that the shielded electric wire is crushed at the electric wire terminal, impedance matching is achieved at the terminal connecting part, and the shield connector and the electric wire terminal Excellent adhesion.

  Furthermore, according to the method for manufacturing a shielded electric wire with a terminal according to the present invention, it is possible to manufacture a shielded electric wire with a terminal that is excellent in impedance matching at the terminal connection portion and excellent in the adhesion between the shield connector and the electric wire terminal.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. In the terminal connection structure of the shielded electric wire according to the present embodiment, the side connected to the shield connector on the other side is the front side, and the opposite side is the rear side.

  As shown in FIG. 1, a shield wire terminal connection structure 10 according to an embodiment of the present invention electromagnetically shields a signal conductor 16 that transmits a signal and an outer periphery of the signal conductor 16 so as to cover the signal conductor 16. The terminal of the shielded electric wire 12 including the shield conductor 18 includes an inner conductor terminal 24 connected to the signal conductor 16 of the shielded electric wire 12 and an outer conductor terminal 26 connected to the shield conductor 18 of the shielded electric wire 12. The shield connector 14 is connected.

  The shielded electric wire 12 includes an insulator 20 made of an insulating material such as a resin material between the signal conductor 16 and the shield conductor 18, and the two conductors are in an insulated state. A sheath 22 made of an insulating material such as a material is covered. The signal conductor 16 of the shielded electric wire 12 is made of a conductive material such as copper, and is composed of a single strand or a stranded wire in which a plurality of strands are bundled. The shield conductor 18 covering the outer periphery of the signal conductor 16 is composed of a braid formed by weaving a plurality of strands made of a conductive material such as copper. In the shielded electric wire 12, the signal conductor 16 and the braid 18 are arranged coaxially, and the braid 18 covers and shields the outer periphery of the signal conductor 16 with no gap, and is suitable for transmitting a high-frequency signal.

  In the shield connector 14 connected to the end of the shielded electric wire 12, an outer conductor terminal 26 is arranged on the outer periphery of the inner conductor terminal 24 connected to the signal conductor 16, and a resin is interposed between the inner conductor terminal 24 and the outer conductor terminal 26. A dielectric 28 made of an insulating material such as a material is assembled.

  The inner conductor terminal 24 is formed by punching and bending a conductive plate material. A main body portion 30 formed in a substantially cylindrical shape is provided on the front side, and a connection portion 32 for connecting to the signal conductor 16 is extended and formed on the rear side of the main body portion 30. The inner conductor terminal 24 is a so-called female inner conductor terminal, and a spring piece 34 is provided inside the main body 30. When the inner conductor terminal 24 is fitted and connected to the mating shield connector, the inner male terminal is provided. The inner conductor terminal is inserted into the main body 30 and is elastically brought into contact with the spring piece 34 so as to be electrically connected.

  The dielectric 28 is formed in a substantially cylindrical shape and opens in the front-rear direction, and the inner conductor terminal 24 is accommodated therein from the rear side. The mating male inner conductor terminal can be inserted from the front side, and the front side is tapered so that the diameter gradually increases in the forward direction so that the male inner conductor terminal can be easily inserted.

  The outer conductor terminal 26 is formed by punching and bending a conductive plate material. The front side is provided with a fitting cylinder portion 36 which is formed in a substantially cylindrical shape and is open in the front-rear direction, and is fitted and connected to the outer conductor terminal of the shield connector on the other side. The dielectric 28 is accommodated in the inside from the front side of the fitting cylinder part 36. When the dielectric 28 is accommodated in the fitting cylinder 36 and the inner conductor terminal 24 is accommodated in the dielectric 28, the fitting cylinder 36 is disposed so as to cover the outer periphery of the inner conductor terminal 24. The terminal 24 is electromagnetically shielded.

  A crimping portion 38 for crimping and connecting to the electric wire end is formed at the rear end of the fitting cylinder portion 36, and the crimping portion 38 is provided with two pairs of crimping pieces 40 for crimping to the electric wire end. Yes. The pair of crimping pieces 40 are arranged side by side in the outer circumferential direction of the crimping portion 38, and the pair of crimping pieces 40 and the other pair of crimping pieces 40 are arranged in the axial direction of the crimping portion 38. Therefore, the wire ends are crimped at two locations. The pair of crimping pieces 40 extend in the direction of each other, one is arranged inside the other, and is crimped to the electric wire terminal so as to overlap.

  In the shield wire end connection structure 10, the sheath 22 is peeled off at the end of the shield wire 12, and the braid 18 is exposed. A substantially cylindrical sleeve 42 is inserted and disposed inside the exposed braid 18 so that the insulator 20 can be prevented from being crushed when the outer conductor terminal 26 is crimped. The sheath 22 is peeled off slightly longer than both the length of the sleeve 42 to be inserted and the length of the crimping portion 38 of the outer conductor terminal 26 to be crimped. Is not inserted. Two pairs of crimping pieces 40 of the outer conductor terminal 26 are crimped to the outside of the exposed braid 18, and the exposed braid 18 is sandwiched between the two pairs of crimping pieces 40 and the sleeve 42. That is, the braid 18 is directly sandwiched between the two pairs of crimping pieces 40 and the sleeve 42 without sandwiching the sheath 22 therebetween, and both the two pairs of crimping pieces 40 crimp the braid 18. Thus, the braid 18 is crimped at two locations.

  On the other hand, in the conventional connection structure 50, as shown in FIG. 2, the length for peeling the sheath 22 is the length of the sleeve 42 to be inserted and the crimping portion 38 of the outer conductor terminal 26 to be crimped. The sleeve 42 is inserted to the inside of the braid 18 to a position where it enters the inside of the sheath 22, and the crimping portion 38 of the outer conductor terminal 26 is also at a position covering the outside of the sheath 22. Of the two pairs of crimping pieces 40 of the crimping portion 38, one pair is disposed outside the braid 18, and the other pair is disposed outside the sheath 22. That is, one pair is a wire barrel that crimps the braid 18, and the other pair is an insulation barrel that crimps the sheath 22, and the braid 18 is crimped at one place.

  Therefore, the connection structure 10 according to the present invention further strengthens the connection between the outer conductor terminal 26 (crimp part 38) and the braid 18 as compared with the conventional connection structure 50.

  Here, considering the fixing force by the crimping piece 40 in the terminal connection structure of the shielded wire, the fixing force by the crimping piece 40 crimped to the sheath 22 is the fixing force between the sheath 22 and the crimping piece 40, and the sheath 22 is considered to be greatly affected by the tensile strength. On the other hand, the fixing force by the crimping piece 40 crimped to the braid 18 is a fixing force between the braid 18 and the crimping piece 40 and is considered to be greatly affected by the tensile strength of the braid 18. The tensile strength of the braid 18 is greater than the tensile strength of the sheath 22, and therefore the fixing force by the crimping piece 40 crimped to the sheath 22 contributes relatively little to the improvement of the fixing force in the entire connection structure.

  Then, the connection structure 10 according to the present invention that further strengthens the connection between the outer conductor terminal 26 and the braid 18 is the same crimp height (compressed height at the connection portion) as the conventional connection structure 50. The fixing force between the shield connector 14 and the wire terminal 12 can be made larger than that of the conventional connection structure 50. Accordingly, it is possible to obtain a sufficient fixing force without reducing the crimp height (while suppressing the shield wire 12 from being excessively compressed and reducing the wire diameter), and impedance matching can be achieved at the terminal connection portion. become able to.

  That is, conventionally, even when the shield wire 12 is crimped with a force that compresses the shielded wire 12 by the crimping piece 40 disposed outside the braid 18 and the sheath 22, a force that does not compress the shielded wire 12 is obtained. The pressure can be pressure-bonded to obtain a fixing force equal to or higher than the conventional one.

  Further, in the connection structure 10 according to the present invention, the sheath 22 is peeled off and the braid 18 is exposed longer than the conventional connection structure 50. Then, the portion of the bottom of the crimping portion 38 of the outer conductor terminal 26 that covers the outside of the sheath 22 and contacts the sheath 22 in the conventional connection structure 50 comes into contact with the braid 18, and the outer conductor terminal 26 is crimped. The contact area between the portion 38 and the braid 18 is larger than that of the conventional one. Moreover, the area where the crimping piece 40 contacts the braid 18 is also increasing. Thereby, the contact resistance value between the braid 18 and the outer conductor terminal 26 is reduced as compared with the prior art.

  And the shielded electric wire with a terminal which concerns on this invention is comprised by what has the connection structure 10 mentioned above. For this reason, the shielded electric wire 12 is prevented from being crushed at the electric wire terminal, impedance matching is achieved at the terminal connecting portion, and the adhesion between the shield connector 14 and the electric wire terminal 12 is excellent.

  Next, the manufacturing method of the shielded electric wire with a terminal which concerns on this invention is demonstrated.

  The method for manufacturing a shielded electric wire with a terminal according to the present invention includes a first step of exposing the braid 18 of the shielded electric wire 12, a second step of inserting a sleeve 42 inside the exposed braid 18, and an exposed braid 18. And a third step of crimping the outer conductor terminal 26.

  In the first step, the end of the shielded electric wire 12 is peeled off stepwise to expose the braid 18 of the shielded electric wire 12. That is, at the end of the shielded electric wire 12, the sheath 22 is peeled off to expose the braid 18 inside thereof, the exposed braid 18 is cut to expose the insulator 20 inside thereof, and exposed. The tip portion of the insulator 20 is cut to expose the signal conductor 16 inside the insulator 20. At this time, the length to peel off the sheath 22 is set to be slightly longer than the length of the sleeve 42 inserted and arranged inside the exposed braid 18 and the length of the crimping portion 38 of the outer conductor terminal 26. .

  Then, the sleeve 42 is disposed only inside the exposed braid 18, and the crimping piece 40 is disposed outside the exposed braid 18. At this time, since the two pairs of the crimping pieces 40 are arranged outside the braid 18 by changing the length of peeling the sheath 22, the outer conductor terminal is newly designed for use in the present invention. There is an advantage that the outer conductor terminal used so far can be used as it is.

  In the second step, the sleeve 42 is inserted inside the exposed braid 18. At this time, the exposed braid 18 may be widened so that the sleeve 42 can be easily inserted. The sleeve 42 is inserted only inside the exposed braid 18 and is not inserted inside the braid 18 that is covered with the sheath 22 and is not exposed. That is, the sleeve 42 is not inserted inside the sheath 22. Therefore, the trouble of inserting the sleeve 42 inside the sheath 22 is saved, the sleeve insertion force is reduced, and the sleeve insertability is improved.

  In the first step, the signal conductor 16 is exposed at the end of the shielded electric wire 12 that has been peeled off in stages. An inner conductor terminal 24 of the shield connector 14 is connected to the exposed end of the signal conductor 16. The connection of the inner conductor terminal 24 is preferably performed after the end of the shielded electric wire 12 is peeled and before the outer conductor terminal 26 is crimped.

  In the third step, the outer conductor terminal 26 is crimped to the exposed braid 18. That is, the crimping portion 38 of the outer conductor terminal 26 is disposed outside the exposed braid 18, and the outside of the braid 18 exposed by the two pairs of crimping pieces 40 of the crimping portion 38 is crimped. Thus, the two pairs of crimping pieces 40 and the sleeve 42 of the outer conductor terminal 26 are clamped from the inner and outer sides of the exposed braid 18.

  In the third step, the outer conductor terminal 26 is connected to the wire terminal 12. An inner conductor terminal 24 connected to the signal conductor 16 of the shielded electric wire 12 is disposed inside the outer conductor terminal 26. The inner conductor terminal 24 is accommodated in the dielectric 28. The inner conductor terminal 24 is accommodated from the rear side of the dielectric 28, and the dielectric 28 is accommodated from the front side of the outer conductor terminal 26. Therefore, the dielectric 28 is accommodated in the fitting tube portion 36 of the outer conductor terminal 26 in advance, and the inner conductor terminal connected to the signal conductor 16 when the outer conductor terminal 26 is crimped to the end of the shielded electric wire 12. 24 may be accommodated in the dielectric 28, or after the outer conductor terminal 26 is crimped to the end of the shielded electric wire 12, the dielectric 28 is accommodated from the front side in the fitting tube portion 36 of the outer conductor terminal 26. In this case, the inner conductor terminal 24 connected to the signal conductor 16 may be accommodated in the dielectric 28.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, in the above embodiment, in order to arrange the two pairs of crimping pieces 40 on the outside of the braid 18, the length to be peeled is a normal length, and the length of the crimping portion 38 is adjusted to the normal skinning length. The outer conductor terminal 26 may be used. Further, although the sleeve 42 is not inserted inside the sheath 22, it may be inserted even inside the sheath 22. Furthermore, in the above embodiment, the two pairs of crimping pieces 40 are arranged outside the braid 18 and the outside of the braid 18 is crimped at two locations, but the outer conductor terminal 26 has three pairs of crimping pieces 40. Alternatively, the outer side of the braid 18 may be crimped at three locations. Of course, the crimping piece 40 does not have to be a pair.

It is sectional drawing showing the terminal connection structure of the shield wire which concerns on one Embodiment of this invention. It is sectional drawing showing the terminal connection structure of the conventional shielded electric wire.

Explanation of symbols

10 Terminal connection structure of shielded wire 12 Shielded wire 14 Shield connector 16 Signal conductor 18 Shield conductor (braided)
20 Insulator 22 Sheath 24 Inner conductor terminal 26 Outer conductor terminal 28 Dielectric 40 Crimp piece 42 Sleeve

Claims (3)

A shield connector provided with an outer conductor terminal connected to the braid is connected to a terminal of a shielded electric wire formed by covering the outer periphery of the signal conductor with a shield conductor made of a braid through an insulator and covering the outer periphery of the braid with a sheath. A shielded wire terminal connection structure,
The outer conductor terminal has a crimping portion having two pairs of crimping pieces to be crimped to the end of the shielded electric wire, and the shielded electric wire is stripped of the sheath at the end to expose the braid. A substantially cylindrical sleeve is inserted and arranged inside the braid, and two pairs of crimping pieces of the outer conductor terminal are crimped to the outside of the exposed braid, and the exposed braid is connected to the sleeve and the outer conductor terminal. A terminal connection structure for a shielded wire, characterized in that it is sandwiched between two pairs of crimping pieces.   It has the terminal connection structure of Claim 1, The shielded electric wire with a terminal characterized by the above-mentioned. A shielded wire end formed by covering the outer periphery of the signal conductor with a shield conductor made of a braid through an insulator and covering the outer periphery of the braid with a sheath, and a crimping portion having two pairs of crimping pieces to be crimped to the end Peeling the sheath having a length corresponding to the entire length of the crimping portion of the outer conductor terminal to expose the braid;
Inserting a substantially cylindrical sleeve inside the exposed braid;
Crimping two pairs of crimping pieces of the outer conductor terminal to the outside of the exposed braid, and clamping the exposed braid between the sleeve and the two pairs of crimping pieces of the outer conductor terminal; The manufacturing method of the shielded electric wire with a terminal characterized by the above-mentioned.

Images