JP2012059440A - Terminal structure of shielded wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal structure of a shielded wire capable of obtaining a strong caulking force over the whole circumference of an electric conduction ring at caulking the electric conduction ring, and also preventing a braided wire and an insulation envelope from being damaged.SOLUTION: In the terminal structure of a shielded wire, the terminal of a shielded wire 10 is peeled to gradually expose the terminal of a core wire 11 and the terminal of a braided wire 13, an underlay ring 40 obtained by bending and forming a metal plate into a cylindrical shape is fitted on the terminal of an insulation envelope 14, the terminal of the braided wire 13 is folded on the outer periphery of the underlay ring 40, an electric conduction ring 30 is fitted on the outer periphery of the braided wire 13 to caulk so as to clamp the electric conduction ring 30 from two mutually opposed directions, and the underlay ring 40 is arranged so that the direction of a split groove 41 formed between both side edges intersects the clamp direction at caulking the electric conduction ring 30.

Description

  The present invention relates to a terminal structure of a shielded wire, and more particularly to a structure of a portion where a conductive ring is fitted to a terminal of a braided wire.

  As an example of the terminal structure of the shielded wire, one described in Patent Document 1 is known. In this case, the end of the shielded wire is peeled to expose the end of the core wire and the end of the braided wire in stages, and a terminal fitting is connected to the end of the core wire. On the other hand, an underlay ring is fitted to the end of the insulating sheath, and the end of the braided wire is folded and overlapped on the outer periphery, and a conductive ring is fitted to the outer periphery of the braided wire, and using a caulking machine The structure is such that the conductive ring and the braided wire are electrically connected by clamping the conductive ring from the upper and lower sides and caulking it into, for example, a hexagonal cross section.

JP 2001-251089 A

Here, with respect to the underlay ring used to reinforce the caulking force of the conductive ring, for the purpose of reducing the cost and the like, the rectangular metal plate material is turned so that the opposite side edges face each other to form a cylindrical shape. The formed one may be used. In other words, such an underlay ring has a shape in which a split groove is formed between the both side edges.
When using an underlay ring having such a grooved cylindrical shape, for example, when set in a caulking machine, if the upper surface or the lower surface of the groove is positioned, the clamping force acts on the portion where the groove is formed. Therefore, both side edges that face each other are deformed so as to bite into the insulating outer skin, so that the caulking strength is inferior, and the insulating outer skin and the braided wire inside thereof may be broken.
The present invention has been completed on the basis of the above circumstances, and its purpose is to obtain a strong caulking force over the entire circumference when caulking the conductive ring, and to braided wire and insulation. It is to be able to prevent the outer skin from being damaged.

  The terminal structure of the shielded electric wire of the present invention exposes the terminal of the core wire and the terminal of the braided wire in stages by peeling off the terminal of the shielded electric wire, and the terminal fitting is connected to the terminal of the core wire, The end of the insulating sheath is fitted with an underlay formed by turning a metal plate into a cylindrical shape, and the end of the braided wire is folded and overlapped on the outer periphery of the underlay ring, and the outer periphery of the braided wire is overlapped. A conductive ring is fitted, and the conductive ring and the braided wire are electrically connected by caulking the conductive ring so as to sandwich the conductive ring from two opposite directions, and The underlay ring is characterized in that a split groove formed between both side edges is arranged in a direction crossing a clamping direction when caulking the conductive ring.

In the caulking and crimping of the conductive ring, after the underlay ring is fitted to the end of the insulating sheath, the end of the braided wire is folded and overlapped on the outer periphery, and the conductive ring is fitted to the outer periphery of the braided wire It is set in a caulking machine and is clamped by being clamped from two opposite directions. At that time, the underlay ring is arranged so that the split groove formed between both side edges faces the direction intersecting the direction of receiving the clamping pressure.
Since the conductive ring is clamped at two positions away from the split groove of the underlay ring, the conductive ring is caulked into a regular cross-sectional shape without unnecessary deformation at the formation position of the split ring of the underlay ring. It is done. Therefore, a strong caulking force can be obtained over the entire circumference, and damage to the braided wire and the insulating outer skin can be avoided.

The following configuration may also be used.
(1) The underlay ring has a confirmation protrusion having a predetermined positional relationship with the split groove so as to protrude from the folded end of the braided wire when covered with the braided wire. Is provided.
After the underlay ring is fitted to the end of the insulation skin, when the end of the braided wire is folded and overlapped on the outer periphery of the underlay ring, a confirmation protrusion having a predetermined positional relationship with the split groove of the underlay ring The portion protrudes from the folded end of the braided wire. Therefore, by rotating the shielded electric wire around the axis while visually checking the confirmation protrusion, the orientation of the underlay ring around the axis can be easily and accurately oriented so as to face the direction intersecting the direction in which the split groove receives the clamping pressure. Can be adjusted.

(2) The protrusion for confirmation is provided over the entire circumference of the underlay ring.
Since it can be said that the protrusion for confirmation is naturally formed by the rear edge of the underlay ring that protrudes from the folded end of the braided wire after the braided wire is folded back and overlapped, the underwear ring is fitted to the insulating outer skin. The protrusion for confirmation is surely formed without being constrained in the front-rear direction. Since the split groove can be directly seen in the confirmation protrusion, the work of adjusting the underlying ring in a predetermined direction can be performed more easily and accurately.

(3) The confirmation protrusion can protrude from the rear edge of the conductive ring.
Since the protrusion for checking the underlay ring can protrude from the rear edge of the conductive ring, the orientation of the underlay ring can be adjusted while observing the protrusion even after the conductive ring is fitted on the outer periphery of the braided wire. And by extension, it is easier to set on a caulking machine. In addition, even after the conductive ring is caulked, the positional relationship between the pinching position and the split groove of the underlay ring can be reinspected.

  According to the present invention, since the underlay ring is arranged in a posture facing the direction intersecting the direction in which the split groove receives the clamping pressure, unnecessary deformation near the split groove of the underlay ring when the conductive ring is caulked. In this case, the conductive ring can be caulked to have a regular cross-sectional shape, a strong caulking force can be obtained over the entire circumference, and damage to the insulating sheath and the braided wire can be prevented.

The partially cutaway side view which shows the terminal structure of the shielded electric wire which concerns on Embodiment 1 of this invention Perspective view of the underlay ring Partially cutaway side view showing conductive ring fitting operation in terminal processing step Partially cutaway side view showing the completion of fitting of the conductive ring Partially cutaway side view of the conductive ring after crimping has been completed Sectional view taken along line VI-VI in FIG. The perspective view of the underlay ring concerning Embodiment 2 Rear view Partially cutaway side view of the conductive ring that has been crimped

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the terminal structure of the shielded electric wire applied to the female shield connector is illustrated.
The shielded electric wire 10 has a structure in which a core wire 11, an insulating inner skin 12, a braided wire 13 and an insulating outer skin 14 are arranged concentrically in order from the inside. A female terminal 20 is connected across the core wire 11 and the end of the insulating endothelium 12 in the shielded electric wire 10, and a conductive ring 30 is crimped and connected to the outer periphery of the end of the braided wire 13.

  As shown in FIG. 1, a wire barrel 23 and an insulation barrel 24 are connected to the female terminal 20 behind a connecting portion 21 having a rectangular tube shape connected to a mating male terminal (not shown). Shape. An elastic contact piece 22 that elastically contacts the tab of the male terminal is provided in the connection portion 21.

The structure of the portion where the conductive ring 30 is caulked and crimped is as follows. At the terminal of the shielded electric wire 10, the terminal of the core wire 11 and the terminal of the braided wire 13 are exposed stepwise by peeling off the insulating outer skin 14 and the insulating inner skin 12. As shown in FIG. 3, an underlay ring 40 is fitted to the end of the insulating sheath 14, and the exposed end of the braided wire 13 is folded and overlapped on the outer periphery thereof. A ring 30 is fitted and caulked and crimped.
Therefore, the conductive ring 30 is formed in a cylindrical shape having a diameter larger than that of the shielded electric wire 10 and having a length substantially equal to the length of the folded braided wire 13. The front end side of the conductive ring 30 is a pressed part 31, and the rear end side is a contact part 32.

  On the other hand, the underlay ring 40 has a rectangular metal plate as a base material, and the metal plate is bent so that the corresponding side edges abut each other. It is formed in a cylindrical shape with a diameter that fits closely. In other words, the underlay ring 40 is formed in a split grooved cylindrical shape in which a split groove 41 is inserted between the opposite side edges.

Since the function of the underlay ring 40 is to receive a caulking force inside the braided wire 13, the length of the underlay ring 40 is at most sufficient if it is long enough to fit completely on the back side of the folded braided wire 13. .
Here, in this embodiment, the length of the underlay ring 40 is formed to be extended. More specifically, as shown in FIG. 3, after the underlay ring 40 is fitted to the end of the insulating outer skin 14. When the braided wire 13 is folded and overlapped, the trailing edge of the underlay ring 40 is a predetermined length from the folded end of the braided wire 13, for example, about 20% of the length of the folded braided wire 13 Is the extent to protrude. The projecting portion of the underlay ring 40 becomes a confirmation projecting portion 45 capable of confirming the position of the split groove 41 as will be described later.

  Further, as shown in FIG. 4, the confirmation protrusion 45 of the underlay ring 40 described above, when the conductive ring 30 is fitted at a regular position covering almost the entire length of the braided wire 13, It is set so as to protrude from the rear edge of the conductive ring 30 so as to be visible.

The present embodiment has the structure as described above, and the terminal treatment process of the shielded electric wire 10 will be specifically described.
As already described, at the end of the shielded electric wire 10, the end of the insulating sheath 14 is stripped over a relatively long dimension, and the end of the insulating endothelium 12 and the braided wire 13 are only shorter than that. By peeling off, the terminal of the core wire 11 and the terminal of the braided wire 13 are exposed stepwise.

Next, the underlay ring 40 is inserted and fitted to the outer periphery of the terminal where the insulating skin 14 is left from the front. Subsequently, as shown in FIG. 3, the braided wire 13 in an exposed state is folded back and overlapped on the outer periphery of the underlay ring 40. At that time, the trailing edge of the underlay ring 40 protrudes a predetermined length from the folded end of the braided wire 13, thereby forming a confirmation protrusion 45.
Subsequently, the conductive ring 30 is inserted from the front, and is fitted on the outer periphery of the folded braided wire 13 as indicated by the arrow line in FIG. As shown in FIG. 4, the conductive ring 30 is fitted to a normal position where the front edge substantially corresponds to the front edge of the underlay ring 40. At this time, the above-described confirmation protrusion 45 is also protruded from the rear edge of the conductive ring 30.

  From this state, the fitting portion of the conductive ring 30 is set in the caulking machine, and the crimped portion 31 on the front end side of the conductive ring 30 is caulked. The caulking machine includes an anvil and a crimper, and functions to caulk in a hexagonal cross section by clamping the pressure-bonded portion 31 of the conductive ring 30 from above and below.

  Here, when setting the fitting portion of the conductive ring 30 to the caulking machine, the confirmation protrusion 45 of the underlay ring 40 is visually observed, and the shield wire 10 is rotated while rotating around the axis as necessary. The orientation of the underlay ring 40 is adjusted so that the split groove 41 of the ring 40 faces the left side (right side is acceptable) as viewed from the back (right side in FIG. 4), and in this state, the conductive ring 30 is Set between anvil and crimper.

  When the crimping operation is performed by the crimper approaching the anvil, the crimped portion 31 of the conductive ring 30 is 90 degrees from the split groove 41 of the underlay ring 40 as shown by the arrow in FIG. As shown in FIG. 5 and FIG. 6, the pressure-bonded portion of the conductive ring 30 is pressed without any unnecessary deformation at the formation position of the split groove 41 of the underlay ring 40. 31 is caulked to a regular hexagonal cross section. Thereby, the fitting process of the conductive ring 30 is completed, and the conductive wire 30 is electrically connected to the braided wire 13.

  After that, as shown in FIG. 1, the end of the core wire 11 and the end of the insulating endothelium 12 that are exposed in stages are caulked and crimped to the wire barrel 23 and the insulation in the female terminal 20, respectively. The core wire 11 and the female terminal 20 are in an electrically connected state. Thus, the terminal processing of the shielded electric wire 10 is completed.

According to this embodiment, when the conductive ring 30 is caulked and crimped by a caulking machine using the underlay ring 40 with the split groove 41, the underlay ring 45 is visually observed by checking the protrusion 45 for confirmation provided on the underlay ring 40. After confirming the position of the 40 split grooves 41 and rotating the shielded electric wire 10 about the axis, the orientation of the underlay ring 40 is adjusted so that the split grooves 41 face sideways, and then the conductive ring 30 is connected to the caulking machine. Can be set between anvil and crimper.
Thereby, the to-be-crimped part 31 of the conductive ring 30 is sandwiched and pressed in two directions, which are shifted from the split groove 41 of the underlay ring 40 by 90 degrees, so that the split ring 41 of the underlay ring 40 is formed at the position where it is formed. The conductive ring 30 can be crimped to a regular hexagonal shape without unnecessary deformation. Therefore, a strong caulking force can be obtained over the entire circumference, and damage to the insulating outer skin 14 and the braided wire 13 inside thereof can be prevented.

  In other words, the confirmation protrusion 45 is formed by the rear edge portion of the underlay ring 40 protruding from the folded end of the braided wire 13 after the braided wire 13 is folded back and stacked. The confirmation protrusion 45 is reliably formed without being restrained in the front-rear direction when fitted to the insulating skin 14. That is, when the underlay ring 40 is fitted to the insulating outer shell 14, it is not necessary to care about the posture in the front-rear direction, and the terminal processing work can be simplified.

  Since the protrusion 45 for confirmation formed in the underlay ring 40 can protrude from the rear edge of the conductive ring 30 that is fitted, even after the conductive ring 30 is fitted on the outer periphery of the braided wire 13, The orientation of the underlay ring 40 can be adjusted while observing the confirmation protrusion 45, that is, the caulking machine can be set while the conductive ring 30 is fitted, so that the setting operation becomes easier. Further, even after the conductive ring 30 is caulked, the positional relationship between the crimping position by caulking and the split groove 41 of the underlay ring 40 can be reinspected.

<Embodiment 2>
7 to 9 show Embodiment 2 of the present invention. In the second embodiment, a change is made to the form of the protrusion 47 for confirmation provided on the underlay ring 40A.
In this embodiment, as shown in FIG. 7 and FIG. 8, the trailing edge of the underlay ring 40A having a cylindrical shape with the split groove 41 having a length that fits in the back side of the folded braided wire 13 as shown in FIGS. A protrusion 47 for confirmation having a predetermined width is formed from a position shifted 90 degrees in the circumferential direction from the formation position of the split groove 41 in FIG.
After the underlay ring 40A is fitted to the end of the insulating sheath 14, when the braided wire 13 is folded and overlapped, the confirmation protrusion 47 protrudes visibly from the folded end of the braided wire 13, Further, when the conductive ring 30 is fitted at a regular position covering the folded braided wire 13 over almost the entire length, the conductive ring 30 is also set to protrude from the rear edge.

  The crimping of the conductive ring 30 is performed as follows. The underlay ring 40A is fitted on the outer periphery of the terminal of the shielded electric wire 10 where the insulating sheath 14 is left, and then the braided wire 13 that is exposed is folded back and overlapped on the outer periphery of the underlay ring 40A. The confirmation protrusion 47 of the underlay ring 40 </ b> A protrudes from the folded end of the braided wire 13. Subsequently, the conductive ring 30 is fitted on the outer periphery of the folded braided wire 13, and the confirmation protrusion 47 protrudes from the rear edge of the conductive ring 30.

From this state, the fitting portion of the conductive ring 30 is set in the caulking machine. At this time, the conductive ring 30 is placed on the caulking machine so that the confirmation protrusion 47 of the underlaying ring 40A comes upward or downward. Set between and crimper. As a result, the underlay ring 40 takes a posture in which the split groove 41 faces sideways.
When the caulking operation is performed from this state, as shown in FIG. 9, the pressure-bonded portion 31 of the conductive ring 30 is clamped in two vertical directions shifted from the split groove 41 of the underlay ring 40 </ b> A by 90 degrees. Similarly, the conductive ring 30 is caulked in a regular hexagonal shape without unnecessary deformation at the formation position of the split groove 41 of the underlay ring 40A.
Since the protrusion 47 for confirmation is formed not only on the entire circumference of the rear edge of the underlay ring 40A but on a part of the circumferential direction, the development area of the base material can be suppressed small, and the material cost can be reduced accordingly. it can.

<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) The confirmation protrusion provided on the underlay ring only needs to protrude at least from the folded end of the braided wire, and may be hidden when the conductive ring is fitted. In this case, when setting the caulking machine, the orientation of the underlay ring may be adjusted before fitting the conductive ring, and then the conductive ring may be fitted and then set.

(2) The position in the case where the protrusion for confirmation is provided at a part in the circumferential direction at the rear edge of the underlay ring is not limited to the position illustrated in the above embodiment, and includes the position where the split groove is formed, Any other position may be used as long as the positional relationship is clearly understood.
(3) The present invention can be similarly applied to a shielded electric wire in which a male terminal is connected to an end of a core wire.
(4) The terminal fitting connected to the end of the core wire may be another type of terminal fitting such as a bolted terminal, and the connection structure of the terminal fitting adopts another structure such as press contact. May be.

DESCRIPTION OF SYMBOLS 10 ... Shield electric wire 11 ... Core wire 13 ... Braided wire 14 ... Insulation outer sheath 20 ... Female terminal (terminal metal fitting)
30 ... Conductive ring 31 ... Pressed part 40, 40A ... Underlay ring 41 ... Split groove 45 ... Protrusion for confirmation 47 ... Protrusion for confirmation

Claims (4)

By stripping the end of the shielded wire, the end of the core wire and the end of the braided wire are exposed stepwise, the terminal metal fitting is connected to the end of the core wire, and the end of the insulating sheath is covered with a metal plate An underlay ring formed by curving into a shape is fitted, and the end of the braided wire is folded and overlapped on the outer periphery of the underlay ring, and a conductive ring is fitted on the outer periphery of the braided wire. The conductive ring and the braided wire are electrically connected by caulking the ring so as to be clamped from two opposite directions.
The underlay ring is arranged such that a split groove formed between both side edges faces a direction crossing a clamping direction when caulking the conductive ring. Terminal structure. The underlay ring is provided with a protrusion for confirmation having a predetermined positional relationship with the split groove so as to protrude from the folded end of the braided wire when covered with the braided wire. The terminal structure of the shielded electric wire according to claim 1, wherein The terminal structure for a shielded electric wire according to claim 2, wherein the protrusion for confirmation is provided over the entire circumference of the underlay ring. 4. The terminal structure of a shielded electric wire according to claim 2, wherein the protrusion for confirmation can protrude from a rear edge of the conductive ring.

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