JP2015084309A - Terminal treatment structure of braided shield - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a connection reliability between inner and outer ferrules of a terminal of a braided shield.SOLUTION: A terminal treatment structure of a braid shield 30 enclosing covered electric wires 20 includes: an inner ferrule 50 arranged on the outer peripheral side of the braid shield 30; and an outer ferrule 60 fitted to the outer peripheral side of the inner ferrule in a state holding the terminal of the braid shield 30. The braid shield 30 is folded backward from the tip side and this folded portion is fixed being held between respective ferrules 50, 60. In the respective ferrules 50, 60, one is formed in the shape of a cylindrical pot and the other is formed in the shape of a conical cylinder.

Description

  The present invention relates to a terminal treatment structure for a braided shield surrounding a covered electric wire.

  Conventionally, when processing the terminal part of the braided shield surrounding the covered electric wire, the processing is performed with a structure as disclosed in Patent Document 1 below. That is, the braided shield is sandwiched between a cylindrical inner ferrule and an outer ferrule, and the terminal treatment is performed by pressing the braided shield, for example, by pressing it with a mold or the like so that the cylindrical shape of the outer ferrule is crushed.

JP2011-165355A

  However, in the terminal processing structure of the prior art disclosed in Patent Document 1, when a long cylindrical ferrule corresponding to a plurality of covered electric wires is compressed and deformed when crimped with a mold or the like, in the long side portion There is a problem in that the required crimping force cannot be obtained and the connection reliability of the braided shield is significantly lowered depending on the crimping location.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a braided shield terminal processing structure that eliminates the above-described problems caused by the prior art and can improve the connection reliability between the inner and outer ferrules of the braided shield terminal portion.

  The braided shield terminal processing structure according to the present invention is a braided shield terminal processing structure that surrounds a covered electric wire, the first annular conductive member disposed on the outer peripheral side of the braided shield, and the first annular conductor A second annular conductive member fitted on the outer peripheral side of the conductive member with the end portion of the braided shield interposed therebetween, and the braided shield member has a distal end side of the first annular conductive member. Folded backward from the front end side along the outer periphery, the folded portion is sandwiched and fixed between the first and second annular conductive members, and the first and second annular conductive members are both In the state before the fitting, one is a cylindrical cylinder and the other is a conical cylinder.

  According to the terminal treatment structure of the braided shield according to the present invention, the braided shield is folded back along the outer periphery from the front end side of the first annular conductive member, and the folded portion is between the first and second annular conductive members. Insert and fix with. Since these first and second annular conductive members are formed in a cylindrical shape on the one hand and in a cylindrical shape on the other side before being fitted together, they are fitted and deformed in the first annular conductive member. The braided shield is fixed in a state where the second annular conductive member is pressed to the first annular conductive member side with a predetermined pressure. For this reason, in the second annular conductive member, the portions where the deformation is not large and the portions that are not deformed are evenly distributed, and the portion that generates a load necessary to hold the braided shield between the first and second annular conductive members. Therefore, the reliability of connection with the inner and outer ferrules at the end of the braided shield can be improved.

In the braided shield terminal treatment structure, the first annular conductive member is conical and the second annular conductive member is a cylinder in a state before the first and second annular conductive members are fitted together. The first annular conductive member has a cylindrical shape, and the outer peripheral cross section on the front end side is smaller than the inner peripheral cross section of the second annular conductive member, and the outer peripheral cross section on the rear end side is that of the second annular conductive member. It may be larger than the inner circumferential cross section.
Alternatively, in a state before the first and second annular conductive members are fitted to each other, the first annular conductive member has a cylindrical shape, the second annular conductive member has a conical cylindrical shape, and the second In the annular conductive member, the inner peripheral cross section on the front end side is smaller than the outer peripheral cross section of the first annular conductive member, and the inner peripheral cross section on the rear end side is larger than the outer peripheral cross section of the first annular conductive member. Also good.

  In the braided shield terminal treatment structure, it is preferable that the second annular conductive member is thinner than the first annular conductive member.

  Further, it is preferable that the second annular conductive member is made of a material having better stretchability than the first annular conductive member.

  Further, the braided shield terminal processing structure may further include a retainer for holding the covered electric wire, and the first annular conductive member may be fitted in a state where the braided shield is sandwiched on the outer peripheral side of the retainer.

  In the braided shield terminal treatment structure, the first and second annular conductive members may have an oval cross section.

  ADVANTAGE OF THE INVENTION According to this invention, connection reliability with the inner and outer ferrule of the terminal part of a braided shield can be improved.

It is a disassembled perspective view of the shield wire harness for demonstrating the terminal processing structure of the braided shield which concerns on the 1st Embodiment of this invention. It is sectional drawing of the shield wire harness. It is a flowchart which shows the terminal processing process of the braided shield. It is sectional drawing of a part of process process of the braided shield. It is a figure for demonstrating the state of the terminal part of the braided shield. It is sectional drawing of the shield wire harness for demonstrating the terminal processing structure of the braided shield which concerns on the 2nd Embodiment of this invention. It is sectional drawing of a part of process process of the braided shield.

  Hereinafter, a braided shield terminal processing structure according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an exploded perspective view of a shield wire harness for explaining a braided shield terminal processing structure according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the shield wire harness. FIG. 3 is a flow chart showing the braided shield terminal processing step, and FIG. 4 is a partial cross-sectional view of the braided shield processing step. Furthermore, FIG. 5 is a figure for demonstrating the state of the terminal part of a braided shield.

  As shown in FIGS. 1 and 2, a shielded wire harness 100 subjected to braided shield terminal processing according to the first embodiment includes, for example, a braided shielded electric wire 10 having a braided shield 30 surrounding a plurality of covered electric wires 20. And a connector connected to the braided shielded electric wire 10. The connector has a connector housing 110 made of a resin molded member and a shield shell 120 made of a metal member.

  The braided shielded electric wire 10 has the respective covered electric wires 20 bundled in the center, and is arranged so as to surround the braided shield 30 on the outer peripheral side thereof, and the outer peripheral side of the braided shield 30 is covered with the covering member 11. It has a covered structure. The braided shield 30 has a structure in which a plurality of thin shield wires are knitted, and is configured to include a reinforcing intermediate material (not shown) such as vinyl that prevents deformation from being knitted.

  In the braided shielded electric wire 10, the covering member 11 is removed at the tip portion, and the opening portion at the tip of the braided shield 30 is widened. The retainer 40 is disposed inside the braided shield 30 and is made of a resin-molded member that holds the respective covered electric wires 20 in an independent state. The retainer 40 is fitted to the outer periphery of the retainer 40 with the braided shield 30 interposed therebetween. A conical cylindrical inner ferrule 50 as a first annular conductive member, and a second annular fitting fitted on the outer peripheral side of the inner ferrule 50 with the tip of the folded braided shield 30 sandwiched therebetween A cylindrical outer ferrule 60 as a conductive member is provided.

  That is, the inner ferrule 50 and the outer ferrule 60 are in a state before being fitted, the inner ferrule 50 has an elliptical conical cylindrical shape, the outer ferrule 60 has an elliptical cylindrical body shape, The outer peripheral section on the front end side is configured to be smaller than the inner peripheral section of the outer ferrule 60, and the outer peripheral section on the rear end side is configured to be larger than the inner peripheral section of the outer ferrule 60.

  Here, the inner ferrule 50 and the outer ferrule 60 are each made of a metal member formed into an elliptical cylindrical shape and an elliptical cylindrical body, but may be a combination of a cylindrical cylinder and a cylindrical cylinder. There is no limitation to this. Further, the outer ferrule 60 is formed of a material having good stretchability so that the plate thickness is thinner if the same material as the inner ferrule 50 and the rigidity is lower if different materials are used. Easily deformable characteristics that are easier to deform than the inner ferrule 50 are provided.

  Therefore, the inner ferrule 50 and the outer ferrule 60 are pressed in the fitting direction relative to each other, and the braided shield 30 is pressed to the inner ferrule 50 side with a predetermined pressure by the outer ferrule 60 that has been fitted and deformed. It is fixed with.

  For this reason, the braided shield 30 is sandwiched between the retainer 40 and the inner ferrule 50, and the leading end side of the sandwiched portion is folded back from the leading end side of the inner ferrule 50 along the outer periphery, and the folded portion is the inner portion. It is sandwiched between the ferrule 50 and the outer ferrule 60, pressed and pressed, and fixed. The retainer 40 includes a plurality of wire insertion holes 41 through which the plurality of covered wires 20 of the braided shielded wire 10 can be individually inserted.

The oval conical cylindrical inner ferrule 50 has a tapered outer shape whose diameter narrows toward the distal end in the terminal direction, and the outer ferrule 60 in the terminal direction of the elliptical outer cylinder 60 has a tapered shape. The peripheral edge portion is a rib 61 having a shape that rises outward. The rib 61 contacts the shield shell 120 when inserted into the connector housing 110, and the shield shell 120 and the braided shield 30 are electrically connected.
In addition to this embodiment, as a structure for electrical connection between the shield shell 120 and the braided shield 30, for example, a spring piece is formed on the shield shell 120 side, and the outer ferrule 60 is connected to the connector housing 110. The spring piece may come into contact with the outer peripheral surface of the outer ferrule 60 when inserted into the outer ferrule 60.

  A plurality of ring-shaped wire seals 80 each having a hole 81 for sealing each covered electric wire 20 while being in close contact are provided on the distal end side of the retainer 40. The terminal 70 is, for example, a known crimp-type terminal, and includes a connection portion 71 connected to the connection counterpart terminal, a crimp portion 72 to which the core wire 21 of the covered electric wire 20 is crimped, and a presser portion 73 that holds the covered electric wire 20. It is configured with. The terminal 70 is crimped and attached to the tip of the core wire 21 of each covered electric wire 20 that has passed through the wire insertion hole 41 of the retainer 40 and the hole 81 of the wire seal 80.

  The connector housing 110 has a terminal receiving hole 111 for receiving each covered electric wire 20 therein, and a terminal of the braided shield 30 to which the inner and outer ferrules 50 and 60 are attached. The terminal portion receiving hole 112 for receiving the portion, the fitting hole 113 into which the other connector formed on the distal end side of the terminal receiving hole 111 is fitted, the same as the fitting hole 113 and the terminal portion receiving hole 112 The shield shell accommodating hole 114 is formed so as to accommodate the shield shell 120 formed at the inner surface level.

  In addition, the connector housing 110 is formed to be recessed in an annular shape on the outer peripheral side of the fitting hole 113, and is provided in the peripheral wall fitting portion 115 into which the peripheral wall of the housing of another connector is fitted, and the housing of the other connector. A locking portion 116 for engaging with the locking piece to lock the fitting state of the connectors. For example, a housing seal 130 formed in an annular shape is inserted and attached to the rear side of the peripheral wall fitting portion 115 in the terminal direction.

  As with the outer ferrule 60, the shield shell 120 is made of a metal member formed in an elliptical cylindrical shape. A grommet 90 for waterproof sealing is attached to the rear side of the connector housing 110 in the terminal direction.

  Next, the terminal processing method of the braided shield 30 of the shield wire harness 100 will be described with reference to FIG. First, the braided shielded electric wire 10 is prepared and cut, for example, at a predetermined cutting position (step S100), and the covering member 11 is cut and removed by a desired length from the cutting position at a cutting position on the rear side in the terminal direction. Then, the braided shield 30 is exposed and the sheath opening is performed. In this case, the direction of the cutting position is the terminal direction.

  Next, the braided shield 30 is loosened so that a space is provided between the braided shield 30 and the reinforcing intermediate material (not shown) is removed, and the covered electric wire 20 is inserted into the terminal insertion hole 41 in the space. Thus, the retainer 40 is inserted, and each covered electric wire 20 is held by the retainer 40 (step S102). Thereby, the outer peripheral side of the retainer 40 is surrounded by the braided shield 30.

  Then, the braided shield 30 is arranged so that the tip end portion in the terminal direction is located in front of the retainer 40 in the terminal direction (step S104), and then the inner ferrule 50 from the tip direction tip side forward of the outer peripheral side of the retainer 40. Are inserted and arranged so that the braided shield 30 can be sandwiched with the retainer 40 later (step S106).

  When the inner ferrule 50 is thus arranged, the tip end portion of the braided shield 30 is folded back toward the terminal direction so as to cover the outer peripheral side of the inner ferrule 50 (step S108). Then, as shown in FIG. 4A, a comb-like jig 59 passing through the mesh from the outer peripheral side of the braided shield 30 is inserted into and abutted at the end of the inner ferrule 50 on the rear side in the terminal direction. Then, the plate-shaped jig 69 is brought into contact with the end of the outer ferrule 60 on the rib 61 side.

  After that, when the inner ferrule 50 and the outer ferrule 60 are relatively pushed in the fitting direction indicated by the arrows in the figure by moving the jigs 59 and 69, first, the outer ferrule 60 has a smaller end diameter than the inner ferrule 50. It contacts the braided shield 30 on the outer peripheral side between the front end and the rear end in the terminal direction having a large diameter.

  If the push-in is continued further, the outer ferrule 60 having the easily deformable characteristic is deformed while being expanded, so that the outer ferrule 50 is finally fitted and deformed on the outer peripheral side of the inner ferrule 50 as shown in FIG. The braided shield 30 is fixed to the inner ferrule 50 side with a predetermined pressure by the outer ferrule 60 (step S110), and the terminal processing of the braided shield 30 is finished.

  In the terminal processing of this embodiment, the inner ferrule 50 is attached to the outer periphery of the retainer 40 so that the braided shield 30 is sandwiched between the retainer 40 (step S106), and the retainer 40 is fitted inside the inner ferrule 50. In this state, the end of the braided shield 30 in the terminal direction is folded back (step S108), and the outer ferrule 60 is attached to the outer periphery thereof, but the retainer 40 is not fitted inside the inner ferrule 50. The distal end portion of the braided shield 30 in the terminal direction is folded back, the outer ferrule 60 is attached to the outer periphery, the retainer 40 is then fitted inside the inner ferrule 50, and the braided shield 30 is connected to the retainer 40 and the inner ferrule 50. You may make it pinch | interpose between.

  After the terminal processing, although illustration and detailed description are omitted, the retainer 40 is pushed into the inner peripheral side of the inner ferrule 50 and the braided shield 30 is sandwiched therebetween, whereby the retainer 40 and the braided shield 30 are inserted. The inner ferrule 50 and the outer ferrule 60 are fixed at the terminal portion.

  Once these are fixed, the wire seal 80 is inserted and attached from the distal end side in the terminal direction, the covering of each covered electric wire 20 is removed to expose the core wire 21, and the terminal 70 is placed on the crimping portion 72. It arrange | positions so that the covered electric wire 20 may be located on the holding | suppressing part 73, and it connects by crimping these.

  Thereafter, with respect to the connector housing 110 in which the shield shell 120 is accommodated in the shield shell accommodation hole 114, the terminal 70 and the terminal portion of the braided shield 30 are placed in the terminal accommodation hole 111 and the terminal portion accommodation hole 112 of the connector housing 110. The shield wire harness 100 can be manufactured by inserting and connecting the rib 61 of the outer ferrule 60 to the inner peripheral surface of the shield shell 120.

  As shown in FIG. 5, in the outer ferrule 60 after pressing and fixing in step S110 described above, attention is paid to, for example, four locations a, b, c, and d shown in FIG. As a result, the degree of deformation is different at each location, and the crimping state of the braided shield 30 is different. Here, the single layer indicates the thickness of one thin wire of the shield constituting the braid, and the multiple layer indicates the thickness of a plurality of thin wires.

  As shown in the figure, the braided shield 30 is flat at the location a and not crushed at the location d in both cases of single layer and multiple layers, but the location a is for the cutting tip side of the braided shield 30, Moreover, since the location d is the clamping side with the retainer 40, there is no problem. And in any one of these locations a to d, for example, locations b and c between the inner and outer ferrules 50 and 60, the braided shield 30 can be sufficiently clamped with a required load. Therefore, the mesh structure of the braided shield 30 makes it possible to obtain an appropriate crimping force at each part even if a part that is a single layer and a part that is a multilayer are mixed. Further, the braided shield 30 can be reliably connected even if the amount of pushing and the pushing position between the inner and outer ferrules 50, 60 are managed to some extent.

  As described above, according to the terminal processing structure according to the first embodiment, the plurality of covered electric wires 20 inside the braided shield 30 are held by the retainer 40, and the braided shield is interposed between the retainer 40 and the inner ferrule 50. 30, the braided shield 30 is folded back and sandwiched between the inner and outer ferrules 50 and 60, and the outer ferrule 60 fitted and deformed to the inner ferrule 50 is pressed against the inner ferrule 50 with a predetermined pressure. The shield 30 can be fixed.

  Therefore, in the outer ferrule 60, the portions d that are not deformed are distributed evenly from the portion a, and the portions that generate the load necessary to hold the braided shield 30 between the inner and outer ferrules 50, 60 are these. This is always possible, and the connection reliability between the inner and outer ferrules 50 and 60 and the braided shield 30 can be improved.

  Further, since the braided shield 30 is crimped and fixed between the inner ferrule 50 and the outer ferrule 60 in a folded state, the braided shield 30 does not come out carelessly from between these. Furthermore, since the cut end portion of the braided shield 30 is disposed on the rear side in the terminal direction, there is no possibility that a part of the braided shield 30 contacts the terminal 70 or the like and short-circuits.

  FIG. 6 is a cross-sectional view of a shielded wire harness for explaining a braided shield terminal processing structure according to a second embodiment of the present invention, and FIG. 7 is a part of the braided shield processing process by the braided shield terminal processing method. FIG. As shown in FIGS. 6 and 7, in the terminal processing structure according to the second embodiment, the inner ferrule 50 has an elliptical cylindrical shape, and the outer ferrule 60 has an elliptical cylindrical shape. However, this is different from the terminal processing structure according to the first embodiment.

  That is, the inner ferrule 50 and the outer ferrule 60 are in a state before being fitted, the inner ferrule 50 has an elliptical cylindrical shape, the outer ferrule 60 has an elliptical cylindrical shape, and the outer ferrule 60 The inner peripheral section on the front end side is smaller than the outer peripheral section of the inner ferrule 50, and the inner peripheral section on the rear end side is configured to be larger than the outer peripheral section of the inner ferrule 50. A tapered edge portion 51 is formed on the outer peripheral side of the inner ferrule 50 to prevent the braided shield 30 from being cut. Other configurations are the same as those of the first embodiment.

  In this case, the rib 61 of the outer ferrule 60 is formed on the rear side in the terminal direction. As shown in FIGS. 7A and 7B, the inner and outer ferrules 50 and 60 having the above-described configuration can be fixed to the braided shield 30 by using the jigs 59 and 69 as shown in FIGS. It becomes possible to connect in the same way as the form. Note that the crimping force of the inner and outer ferrules 50 and 60 is different from that in the first embodiment, and the front end side is larger and the rear end side is smaller.

DESCRIPTION OF SYMBOLS 10 Braided shield electric wire 11 Covering member 20 Covered electric wire 21 Core wire 30 Braided shield 40 Retainer 41 Electric wire insertion hole 50 Inner ferrule 51 Tapered edge part 60 Outer ferrule 61 Rib 59, 69 Jig 100 Shield wire harness

Claims (7)

A braided shield terminal processing structure surrounding a covered electric wire,
A first annular conductive member disposed on the outer peripheral side of the braided shield;
A second annular conductive member fitted on the outer peripheral side of the first annular conductive member with the terminal portion of the braided shield interposed therebetween;
The braided shield has its distal end folded back toward the rear from the distal end side of the first annular conductive member, and the folded portion is sandwiched between the first and second annular conductive members. Fixed,
One of the first and second annular conductive members is in the form of a cylindrical cylinder and the other is in the form of a conical cylinder in a state before the fitting of the two. The braided shield terminal treatment structure, In a state before the first and second annular conductive members are fitted together, the first annular conductive member has a conical cylindrical shape, and the second annular conductive member has a cylindrical body shape, and the first annular conductive member has a cylindrical shape. The conductive member is characterized in that the outer peripheral cross section on the front end side is smaller than the inner peripheral cross section of the second annular conductive member, and the outer peripheral cross section on the rear end side is larger than the inner peripheral cross section of the second annular conductive member. The braided shield terminal processing structure according to claim 1. In a state before the first and second annular conductive members are fitted, the first annular conductive member has a cylindrical shape, the second annular conductive member has a conical cylindrical shape, and the second annular shape. The conductive member is characterized in that the inner peripheral cross section on the front end side is smaller than the outer peripheral cross section of the first annular conductive member, and the inner peripheral cross section on the rear end side is larger than the outer peripheral cross section of the first annular conductive member. The braided shield terminal processing structure according to claim 1. The terminal treatment structure for a braided shield according to any one of claims 1 to 3, wherein the second annular conductive member is thinner than the first annular conductive member. The braided shield according to any one of claims 1 to 3, wherein the second annular conductive member is formed of a material having better stretchability than the first annular conductive member. Terminal processing structure. A retainer for holding the covered electric wire;
The braided shield terminal treatment structure according to any one of claims 1 to 5, wherein the first annular conductive member is fitted in a state in which the braided shield is sandwiched on an outer peripheral side of the retainer. . The braided shield terminal treatment structure according to any one of claims 1 to 6, wherein the first and second annular conductive members have an oval cross section.

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