JP2011253724A - Terminal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal fitting which prevents an overlapping portion of barrels from collapsing and suppresses a deterioration of wire fixing force.SOLUTION: In the terminal fitting, a pair of insulation barrel pieces 13R and 13L which are connected to a terminal of a shield wire 30 are wound around an insulated outer covering portion 34 of the shield wire 30 and crimped in overlapping with each other. A regulation piece 22 is provided at a position of the insulation barrel piece 13L where the insulation barrel pieces 13R and 13L are overlapped and is capable of abutting with a side edge of the insulation barrel piece 13R.

Description

  The present invention relates to a terminal fitting including a barrel piece for crimping an electric wire.

  Conventionally, for example, a terminal fitting described in Patent Document 1 is known as a terminal fitting connected to a terminal portion of an electric wire. This terminal fitting includes a wire barrel portion that is caulked to a core wire of an electric wire, and an insulation barrel portion that is caulked to an insulating covering portion. The wire barrel portion has a pair of wire barrel pieces that are firmly caulked against the core wire so that the tip of the wire barrel portion bites into the core wire. On the other hand, the insulation barrel portion has a pair of barrel pieces that are wound so as to embrace the covering portion from both sides.

JP 2010-44996 A

However, the insulation barrel part is crimped by a so-called overlapped form in which both barrel pieces are overlapped, in addition to being squeezed with a tightening force that does not cause the covering part to be broken. Is likely to occur. When both barrel pieces are collapsed, the force for caulking the covering portion is reduced.
For example, when this type of terminal fitting is applied to a shielded electric wire whose core wire is covered with a braided wire, the braided wire is caulked in an overlapping manner by a wire barrel portion. Therefore, the wire adhering force of the wire barrel portion in the shielded wire is weaker than that in the case of being crimped to the core wire of the wire. For this reason, the wire fixing force of the insulation barrel portion in the shielded wire is very important, and the collapse of both barrel pieces may reduce the fixing force of the terminal fitting to the shielded wire as a whole.

  This invention is completed based on the above situations, Comprising: It aims at preventing the fall of a wire adhering force by restricting collapse of both barrel pieces which crimp a coating | coated part.

As means for achieving the above object, the present invention provides a terminal fitting in which a pair of barrel pieces connected to the end of an electric wire are wound and pressed in a state of overlapping from both sides of the covering portion of the electric wire, One of the barrel pieces is provided with a restriction piece capable of contacting the side edge of the other barrel piece in the axial direction of the electric wire at the overlapping position.
According to such a configuration, when the two barrel pieces are pressure-bonded in an overlapping state, the restriction piece provided on one barrel piece comes into contact with the side edge of the other barrel piece, thereby Unwinding is restricted, and a decrease in the wire fixing force can be prevented.

The following configuration is desirable as an embodiment of the present invention.
The said restriction piece is good also as a structure provided in the side edge of the said barrel piece wound around the outside. According to such a configuration, by providing the restriction piece on the barrel piece wound from the outside, the restriction piece can be easily crimped to the side edge of the barrel piece located inside.
The height from the one barrel piece to the tip of the restricting piece may be configured such that the tip of the restricting piece does not penetrate the covering portion so as to be able to bite into the covering portion. According to such a configuration, since the regulating piece of one barrel piece wound around the outer side is fixed in a state of biting into the covering portion of the electric wire, the one barrel piece located on the outside is somewhat different from the surrounding members. Even if it contacts, it can control that the state of an overlap part collapses.

It is good also as a structure provided with the connection part connected to an other party terminal metal fitting, and the said control piece being provided in the side edge by the side of the said connection part in the said barrel piece. According to such a configuration, when the metal plate material is punched and processed, the restriction piece can be formed by effectively utilizing the dead space formed between the connection portion and the barrel piece in the unfolded state.
A portion of one barrel piece that overlaps the other barrel piece is formed with a thin-walled portion that becomes thinner toward the tip, and a base end portion of the restriction piece is attached to the other barrel piece. It is good also as a structure which has the 1st contact surface which stands | starts up toward the said thin part, and has a 2nd contact surface arranged by shifting in the axial direction of this electric wire with this 1st contact surface.
In such a configuration, when both barrel pieces are wound around the covering portion, the tip of the other barrel piece overlaps the thin wall portion of one barrel piece, so that the side edge of the other barrel piece abuts the first contact surface. Arranged in contact. Thereby, collapse of both barrel pieces can be controlled.
However, when a slight shift occurs in the overlapping state of the two barrel pieces, the other barrel piece may ride on the first contact surface. In this case, the second contact surface is in contact with the side edge of the other barrel piece, so that the collapse of both barrel pieces for caulking the covering portion can be restricted.

  The electric wire may be a shielded electric wire including a braided wire that covers and shields a core wire and the covering portion that covers the braided wire, and the barrel pieces may be crimped to the covering portion. . In the case of a shielded wire, it is desirable that the crimping cross section is a perfect circle from the viewpoint of improving high frequency characteristics. In order to maintain this perfect circular shape, the force for caulking the covering portion may be made smaller than that of a normal electric wire, and both barrel pieces are likely to collapse. Even in such a case, the present invention is suitable for a shielded electric wire having a braided wire because it can restrict the collapse of both barrel pieces.

  According to the present invention, it is possible to regulate the collapse of both barrel pieces that caulk the covering portion.

The perspective view of the terminal metal fitting which concerns on this embodiment Plan view Front view Rear view Side view The perspective view which shows the state in which the terminal metal fitting was connected to the terminal of a shielded electric wire Sectional drawing which shows the state in which the terminal metal fitting with which the inner conductor terminal and the dielectric material were mounted | worn was accommodated in the connector housing

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS.
The terminal fitting 10 of the present embodiment is formed by punching a metal plate (not shown) having excellent conductivity and performing a predetermined bending process or the like. For example, the terminal fitting 10 of the shielded electric wire 30 is used as an outer conductor terminal for a high frequency connector. Connected to the terminal.
As shown in FIG. 7, the shielded electric wire 30 includes a signal wire 31 (corresponding to a core wire) arranged at the center of the axis, and an insulation inner coating portion (inner coating portion) arranged concentrically on the outer peripheral side of the signal wire 31 32), a braided wire 33 covering the in-insulation covering portion 32, and an insulating outer covering portion (corresponding to the covering portion) 34 covering the braided wire 33. At the end of the shielded electric wire 30, the insulation outer covering portion 34 is peeled off and the braided wire 33 is exposed.
As shown in FIGS. 1 to 5, the terminal fitting 10 includes a cylindrical connecting portion (corresponding to a connecting portion) 11 having a cylindrical shape, a wire barrel portion 12 disposed behind the cylindrical connecting portion 11, and the wire. And an insulation barrel portion 13 disposed behind the barrel portion 12.

As shown in FIG. 7, an inner conductor terminal 40 connected to the signal line 31 of the shielded electric wire 30 is accommodated inside the cylindrical connection portion 11, and between the inner conductor terminal 40 and the cylindrical connection portion 11. Is provided with a dielectric 41 made of an insulating material for insulating them.
On the outer surface of the cylindrical connecting portion 11, there are formed a lance locking projection 14 formed at the top end portion on the upper surface side and a retainer locking projection 15 formed at the rear end portion on the bottom surface side. As shown in FIG. 7, the lance locking protrusion 14 is locked by a flexible lance 52 provided in the cavity 51 of the connector housing 50, and the retainer locking protrusion 15 is provided on the connector housing 50. The retainer 54 is retained by the retainer mounting hole 53.

  On the other hand, as shown in FIG. 1, the wire barrel portion 12 includes a pair of arc-shaped bottom plate portions 16 </ b> A extending rearward from the cylindrical connection portion 11, and a pair of rising upward from the left and right side edges of the bottom plate portion 16 </ b> A. It comprises wire barrel pieces 12R and 12L. As shown in FIGS. 6 and 7, the pair of wire barrel pieces 12R and 12L is formed on the outer circumferential surface of the braided wire 33 so as to be held from both the left and right sides of the braided wire 33 of the shielded electric wire 30 disposed on the bottom plate portion 16A. It is wound and caulked in a so-called overlap type in which the tips of each other overlap. As a result, the terminal fitting 10 is electrically connected to the braided wire 33, and the inner conductor terminal 40 is electromagnetically shielded in the cylindrical connection portion 11 of the terminal fitting 10.

Further, a slit 17 extending in a direction orthogonal to the axial direction of the shielded electric wire 30 is provided in the central portion of the bottom plate portion 16A of the wire barrel portion 12 and the central portion of the wire barrel piece 12L located on the left side in the rear view. . The slit 17 is configured to bite into the braided wire 33 when both wire barrel pieces 12R and 12L are caulked to the braided wire 33.
In addition, a first bent groove 12A is provided in the inner surface of the distal end portion of the wire barrel piece 12L on the left side in the rear view in a direction parallel to the axial direction of the shielded electric wire 30. The bent groove 12A serves to make it easier for the left wire barrel piece 12L to enter the inside of the right wire barrel piece 12R when the two wire barrel pieces 12R and 12L are caulked.
A first tapered surface 18 is formed on the outer surface of the distal end portion of the wire barrel piece 12L. The first tapered surface 18 is inclined toward the inner distal end side. The inner surface of the distal end portion of the wire barrel piece 12R is inclined toward the outer distal end side. A second tapered surface 19 is formed. These taper surfaces 18 and 19 serve to make the barrel pieces 12R and 12L easy to adhere to each other when the wire barrel pieces 12R and 12L are caulked in an overlapping manner.

On the other hand, the insulation barrel portion 13 is formed behind the wire barrel portion 12 with an interval. As shown in FIG. 1, the insulation barrel portion 13 includes a widened bottom plate portion 16B provided behind the bottom plate portion 16A of the wire barrel portion 12 so as to be wider than the bottom plate portion 16A, and left and right side edges of the widened bottom plate portion 16B. And a pair of insulation barrel pieces 13R and 13L rising upward. In the following description, the insulation barrel pieces 13R and 13L may be abbreviated as barrel pieces 13R and 13L, respectively.
As shown in FIGS. 6 and 7, the pair of barrel pieces 13 </ b> R and 13 </ b> L is formed to be narrower than the wire barrel pieces 12 </ b> R and 12 </ b> L. The pair of barrel pieces 13R and 13L is wound around the outer peripheral surface of the insulating outer covering portion 34 so as to be held from both the left and right sides of the insulating outer covering portion 34 of the shielded electric wire 30, and the so-called over-over which overlaps the tip portions of each other. It is squeezed into a lap state. Thereby, the insulation barrel part 13 is fixed to the insulation outer covering part 34, and the terminal fitting 10 is held and fixed to the shielded electric wire 30 together with the wire barrel part 12.

On the inner surface of the tip of the right barrel piece (the right side barrel piece as viewed from the back) 13R, the second barrel for making it easier to get inside the left barrel piece (the left side barrel piece as viewed from the back) 13L, contrary to the wire barrel portion 12. A bent groove 13A is provided. The second bent groove 13 </ b> A is provided so as to extend in a direction parallel to the axial direction of the shielded electric wire 30.
Moreover, the thin part 26 which becomes thin toward the front end side is provided at the front end part of the left barrel piece 13L. The inner surface of the thin portion 26 is a third tapered surface 20 that is inclined toward the distal end side in the outward direction. On the other hand, a thin-walled portion 27 that is thinner toward the distal end side is also provided at the distal end portion of the right barrel piece 13R. The outer surface of the thin portion 27 is a fourth tapered surface 21 that inclines toward the tip end in the inward direction. These thin-walled portions 26 and 27, like the tapered surfaces 18 and 19 of the wire barrel portion 12, make it easy for the barrel pieces 13R and 13L to closely contact each other when the barrel pieces 13R and 13L are wound in an overlapping manner. Act on.

Now, a regulating piece 22 is provided at the side edge on the front side (wire barrel piece 12 side) at the tip of the left barrel piece 13L. As shown in FIGS. 1, 2 and 4, the restricting piece 22 protrudes inward (in the direction toward the right barrel piece 13R in FIG. 1) from the front side edge at the tip of the left barrel piece 13L. I am doing. The restricting piece 22 is formed by bending inward with the front side edge at the tip of the left barrel piece 13L as a bending edge. In addition, the control piece 22 is provided in the position adjacent to the thin part 26 in the position where both the barrel pieces 13R and 13L overlap.
The restricting piece 22 is formed between the cylindrical connecting portion 11 and the insulation barrel portion 13 when the terminal fitting 10 is unfolded, that is, using a dead space. The terminal fitting 10 is in a state in which a plurality of unfolded terminal fittings 10 are adjacently connected in a state before being cut into pieces. Therefore, the regulating piece 22 can be formed without changing the pitch between the pair of adjacent terminal fittings 10 and 10 in a state where the plurality of developed terminal fittings in the previous stage of cutting into individual pieces are connected.

A first contact surface 23 that rises inward from the side edge of the third tapered surface 20 is formed at the base end portion of the restriction piece 22. In addition, a second abutting surface 24 is formed at the tip of the restricting piece 22 and is shifted forward from the first abutting surface 23. The first contact surface 23 and the second contact surface 24 are connected to each other via a bent surface formed when the regulating piece 22 is bent. Both the contact surfaces 23 and 24 are surfaces that intersect the axial direction of the shielded electric wire 30. Note that an engagement claw 25 having a tapered shape is formed at the distal end of the restriction piece 22.
The first abutting surface 23 comes into contact with or close to the side edge of the right barrel piece 13R that has entered the third tapered surface 20 by pressure-bonding both the barrel pieces 13R, 13L. Accordingly, the first abutting surface 23 abuts against the side edge of the right barrel piece 13R, so that the collapse of the barrel pieces 13R and 13L is restricted.
Further, when the right barrel piece 13R is crimped in front of the original crimping position, it is expected that the right barrel piece 13R rides on the first contact surface 23. Even in this case, the front side edge of the right barrel piece 13R can be brought into contact with the second contact surface 24, so that the collapse of the barrel pieces 13R and 13L is restricted.
The protruding height of the restricting piece 22 from the left barrel piece 13L is slightly longer than the plate thickness dimension of the right barrel piece 13R, and the plate thickness dimension of the right barrel piece 13R and the thickness dimension of the insulating outer covering portion 34 are the same. The dimensions are set shorter than the sum. For this reason, when both the barrel pieces 13R and 13L are pressure-bonded to the insulating outer covering portion 34, the engaging claws 25 at the distal end portion of the regulating piece 22 are in a state of being bitten into the insulating outer covering portion 34, but come into contact with the braided wire 33. There is nothing.

The terminal fitting 10 of the present embodiment has the structure as described above. Next, a method for connecting the terminal fitting 10 and the shielded electric wire 30 will be described, and the operation and effect thereof will be described together.
First, the insulation outer covering portion 34 is peeled off at the end of the shielded wire 30 to expose the braided wire 33, and the insulation inner covering portion 32 is peeled off to expose the signal line 31. The inner conductor terminal 40 is crimped and connected to the end of the signal line 31.
On the other hand, the dielectric 41 is accommodated in advance in the cylindrical connecting portion 11 of the terminal fitting 10, and the inner conductor terminal 40 connected to the signal line 31 is inserted into the dielectric 41 to prevent it from coming off. Attach to the state. Accordingly, the exposed braided wire 33 in the shielded electric wire 30 is disposed on the bottom plate portion 16A of the wire barrel portion 12, and the insulating outer covering portion 34 is disposed on the bottom plate portion 16B of the insulation barrel portion 13.

  In this state where the shield wire 30 is arranged on the terminal fitting 10, in order to caulk both the wire barrel pieces 12R, 12L and the two insulation barrel pieces 13R, 13L of the terminal fitting 10, an anvil (not shown) and a crimper (not shown) are used. Crimping is performed by a known crimping machine having At this time, both the wire barrel pieces 12R and 12L are caulked around the braided wire 33 from both left and right sides on the outer peripheral surface of the braided wire 33 in an overlapping manner. Then, at the initial stage of the caulking operation, the tip of the left wire barrel piece 12L bends inward from the position of the first bent groove 12A, and the left wire barrel piece 12L sinks inside the right wire barrel piece 12R. . Thereby, both wire barrel pieces 12R and 12L are caulked smoothly, and as shown in FIG. 6, the tip portions of both wire barrel pieces 12R and 12L are connected in an overlapping manner. Further, the wire barrel pieces 12R and 12L are caulked in close contact with each other by the first and second tapered surfaces 18 and 19 provided at the tip portions of the wire barrel pieces 12R and 12L.

  On the other hand, in the insulation barrel portion 13, both the barrel pieces 13R and 13L are squeezed so as to be wrapped around the outer peripheral surface of the insulating outer covering portion 34 from both the left and right sides in the same manner as the two wire barrel pieces 12R and 12L. And fixed in overlapping form. Since the thin-walled portion 27 is formed at the tip of the right barrel piece 13R in the initial stage of the caulking operation, the right barrel piece 13R is not in contact with the left barrel piece 13L without the tips of the barrel pieces 13R and 13L interfering with each other. Guided inside. Further, the right barrel piece 13R surely sinks inside the left barrel piece 13L by bending inward from the position of the second bent groove 13A. Thereby, the overlap type crimping can be smoothly performed. Also, the barrel pieces 13R and 13L are caulked in close contact with each other by the third and fourth tapered surfaces 20 and 21 provided at the tip portions of the barrel pieces 13R and 13L.

By the way, since both the barrel pieces 13R and 13L are pressure-bonded in an overlapping manner, the left barrel piece 13L wound around the outside tends to collapse. However, since the restriction piece 22 is formed on the left barrel piece 13L of the present embodiment, when the restriction piece 22 abuts on the side edge of the right barrel piece 13R, the barrel pieces 13R and 13L are unrolled. Be regulated. Specifically, when one of the contact surfaces 23 and 24 contacts the side edge of the right barrel piece 13R, the collapse of the barrel pieces 13R and 13L is restricted. Thereby, the insulation outer coating | coated part 34 can be crimped | bonded by crimping, without the mutual barrel pieces 13R and 13L collapsing.
Further, when the left barrel piece 13L is caulked to the right barrel piece 13R, the engagement claw 25 of the restriction piece 22 bites into the insulating outer covering portion 34 of the shielded wire 30, so that the left barrel piece 13L is moved in the front-rear direction. Be regulated. On the other hand, since the right barrel piece 13R is in contact with the insulating outer covering portion 34 in a slightly biting manner, the movement in the front-rear direction is restricted. In this way, loosening of the barrel pieces 13R, 13L is restricted, and the fixing force of the terminal fitting 10 can be improved.

Further, when the terminal fitting 10 connected to the shielded electric wire 30 is carried out, even if the left barrel piece 13L slightly contacts with surrounding members, the engaging claws 25 bite into the insulating outer covering portion 34 of the shielded electric wire 30. Therefore, it is possible to prevent the state of the overlapping portion from collapsing.
Furthermore, even when the left barrel piece 13L is slightly displaced forward when crimping both the barrel pieces 13R, 13L by crimping with a crimper (not shown), the Since the two contact surfaces 24 are in contact with the side edge of the right barrel piece 13R, it is possible to prevent the overlapping state from being largely collapsed.

As described above, in the terminal fitting 10 of the present embodiment, the provision of the restriction piece 22 enables crimping and crimping without breaking the overlapping portion of the barrel pieces 13R and 13L. The claw 25 can improve the fixing force to the shielded electric wire 30.
Moreover, in the terminal metal fitting 10 of this embodiment, when the regulation piece 22 is provided in the dead space between the cylindrical connection part 11 and the insulation barrel part 13, when a metal plate is stamped and formed by a press, it is newly It is not necessary to provide a space for the restriction piece 22, and the dead space can be used effectively.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the restriction piece 22 is applied to the outer conductor terminal attached to the shielded electric wire 30. However, the present invention can be widely applied to terminal fittings that are crimped to the electric wire. That is, you may apply to the terminal metal fitting connected to the electric wire which consists of a core wire and a coating | coated part.
(2) In the above embodiment, the restriction piece 22 is formed on the front side edge of the left barrel piece 13L. However, the present invention is not limited to such a mode, and for example, the left barrel piece 13L. You may form the control piece 22 in the side edge of the rear side in. Moreover, you may form the control piece 22 in the right barrel piece 13R.
(3) In the above embodiment, the restriction piece 22 is formed at a position adjacent to the thin portion 26 at the position where the two barrel pieces 13R, 13L of the left barrel piece 13L overlap. It is not limited. The restriction piece 22 only needs to be formed at least at a part where the barrel pieces 13R and 13L overlap each other. For example, the restriction piece 22 may be formed in plural at the position where the barrel pieces 13R and 13L overlap. Moreover, the regulation piece 22 may be formed over the full length of the position where both the barrel pieces 13R and 13L overlap.
(4) In the above-described embodiment, the engagement claw 25 that bites into the insulation outer covering portion 34 of the shielded wire 30 is provided on the restriction piece 22, thereby improving the fixing force of the terminal fitting 10 to the shielded wire 30. However, the present invention is not limited to such an embodiment. For example, by providing a slit similar to the slit 17 of the wire barrel portion 12 in the barrel pieces 13R and 13L, the slit is formed as an insulating outer covering portion. 34 may be bitten. In that case, it is good also as a structure which does not provide the engagement nail | claw 25 in the front-end | tip part of the control piece 22. FIG.
(5) Although the terminal fitting is provided with the cylindrical connecting portion 11 in the above embodiment, according to the present invention, the terminal fitting may be applied to a crimp terminal that is crimp-connected to the mating terminal at the wire barrel portion 12.
(6) In the above embodiment, although the first contact surface 23 is formed in association with the provision of the thin portion 26, according to the present invention, neither the thin portion nor the first contact surface is formed. Thus, only the second contact surface may be formed.

11: Cylindrical connection (connection)
13: Insulation barrel piece (barrel piece)
20: Third taper surface (thin portion)
22: Restriction piece 26: Thin portion 30: Shielded wire (electric wire)
31: Signal line (core wire)
33: Braided wire 34: Insulation outer covering portion (covering portion)

Claims (6)

A pair of barrel pieces connected to the terminal of the electric wire is a terminal fitting that is wound and crimped in an overlapping state from both sides of the covering portion of the electric wire,
A terminal fitting in which a restriction piece capable of abutting in the axial direction of the electric wire with respect to a side edge of the other barrel piece is provided on one of the barrel pieces at a position where the barrel pieces overlap each other. .   The terminal fitting according to claim 1, wherein the regulating piece is provided on a side edge of one of the barrel pieces wound around the outside.   The height from the one barrel piece to the tip of the restricting piece is set so that the tip of the restricting piece can bite into the covering portion in a manner that the tip of the restricting piece does not penetrate the covering portion. The terminal fitting described.   The connection part connected to an other party terminal metal fitting is provided, The said control piece is provided in the side edge by the side of the said connection part in the said barrel piece, The Claim 1 characterized by the above-mentioned. The terminal fitting described.   A portion of one barrel piece that overlaps the other barrel piece is formed with a thin-walled portion that becomes thinner toward the tip, and a base end portion of the restriction piece is attached to the other barrel piece. The first abutting surface rising toward the thin wall portion and the first abutting surface having a second abutting surface arranged so as to be shifted in the axial direction of the electric wire. The terminal metal fitting as described in any one of thru | or 4.   The electric wire is a shielded electric wire including a braided wire that covers and shields a core wire, and the covering portion that covers the braided wire, wherein both the barrel pieces are crimped to the covering portion. The terminal metal fitting as described in any one of Claim 1 thru | or 5.

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