JP5195191B2 - Terminal fittings and electric wires with terminal fittings - Google Patents

Description

  The present invention relates to a terminal fitting and an electric wire with terminal fitting.

Conventionally, what is described in Patent Document 1 is known as a terminal fitting to be crimped to an end of an electric wire. The terminal fitting includes a crimping portion that is crimped to the core wire exposed from the end of the electric wire, and a connection portion that extends from the crimping portion and is connected to the mating terminal fitting. By crimping the crimping portion to the core wire, the core wire and the crimping portion are electrically connected.
Japanese Patent Laid-Open No. 10-125362

  If an oxide film is formed on the surface of the core wire, there is a concern that the electrical resistance between the electric wire and the terminal fitting increases. In order to solve this problem, it is conceivable to increase the pressure when the crimping part is crimped to the core wire. As a result, the core wire is greatly plastically deformed by receiving pressure from the crimping portion, and the surface of the core wire and the inner wall of the crimping portion are in sliding contact. Then, the oxide film formed on the surface of the core wire is peeled off and the new surface of the core wire is exposed. It was expected that the electrical resistance between the electric wire and the terminal fitting would be reduced by the contact between the new surface and the crimping part.

  However, according to the above configuration, there is a problem in that, by applying a relatively large pressure to the crimping portion, the crimping portion itself is plastically deformed, and the length dimension of the terminal fitting is increased. In particular, there is a concern that the length dimension of the terminal fitting in the direction in which the electric wire extends changes greatly. This is due to the following reason.

  The step of crimping the crimping portion to the core wire is performed by placing the core wire on the crimping portion and then sandwiching the crimping portion from above and below by a pair of molds. The above mold is provided with an escape hole for allowing the electric wire to escape in an extending direction of the electric wire. The pressure-bonding portion that receives pressure from the core wire is deformed so as to protrude outward from the above-described escape hole, and tries to release the pressure. For this reason, a crimping | compression-bonding part deform | transforms about the extension direction of an electric wire, As a result, the length dimension of the terminal metal fitting about the extension direction of an electric wire will change a lot.

  When the length dimension of the terminal fitting changes, there is a concern that the terminal fitting protrudes from the connector housing when the terminal fitting is accommodated in the connector housing.

  The present invention has been completed based on the above-described circumstances, and provides a terminal fitting and a terminal-attached electric wire that are prevented from increasing in length in the direction in which the electric wire extends before and after crimping. For the purpose.

The present invention is a terminal fitting, wherein an electric wire is placed and a bottom plate formed extending in an extending direction of the electric wire, and protrudes laterally from a side edge of the bottom plate so as to be wound around the electric wire. A barrel piece to be crimped, a connection portion extending from the bottom plate and connected to a mating terminal metal fitting, and a portion of the bottom plate that is positioned closer to the end of the wire than the barrel piece in the extending direction. A connecting portion that connects a portion located on the opposite side of the end of the electric wire from the barrel piece with respect to the direction, and a pair of the connecting portions is formed on the bottom plate, and the pair of connecting portions Is formed line-symmetrically with respect to the bottom plate, and a cut portion formed by cutting the connecting portion is provided on a side edge of the bottom plate .

Further, the present invention is an electric wire with a terminal fitting, comprising: an electric wire including a core wire; and a terminal fitting that is crimped to the core wire exposed from an end of the electric wire, and the core wire is placed and the A bottom plate formed extending in the extending direction of the electric wire, a barrel piece that is protruded laterally from a side edge of the bottom plate and is crimped to wrap around the core wire, and connected to the mating terminal fitting extending from the bottom plate And a portion of the bottom plate that is located on the end side of the electric wire with respect to the extending direction in the extending direction and an end portion of the electric wire that is on the opposite side of the barrel piece with respect to the extending direction. A pair of connecting portions formed on the bottom plate, the pair of connecting portions being formed symmetrically with respect to the bottom plate, and a side edge of the bottom plate. Cut the connecting part Comprising the formed cut.

According to the present invention, the portion of the bottom plate that is located on the end side of the electric wire from the barrel piece in the extending direction and the portion that is located on the opposite side of the end of the electric wire from the barrel piece in the extending direction are the connecting portion. It is connected by. By this connection part, when a barrel piece is crimped | bonded to an electric wire (core wire), it can suppress that a baseplate extends in the extending direction.
Moreover, since a pair of connection part is formed symmetrically about the bottom board, when a barrel piece is crimped | bonded to an electric wire, it can suppress that a bottom board distorts asymmetrically about the extension direction.
Furthermore, the terminal fitting can be reduced in size as a whole by cutting the connecting portion.

As embodiments of the present invention, the following embodiments are preferable .

  The core wire may be made of aluminum or an aluminum alloy.

  When the core wire is made of aluminum or an aluminum alloy, an oxide film is relatively easily formed on the surface of the core wire. The above configuration is effective when an oxide film is easily formed on the surface of the core wire.

  ADVANTAGE OF THE INVENTION According to this invention, before and after crimping | compression-bonding, it can suppress that the length dimension of a terminal metal fitting becomes large about the direction where an electric wire is extended.

  An embodiment of the present invention will be described with reference to FIGS. The present embodiment is a terminal including an electric wire 11 including a core wire 10 and a female terminal fitting 12 (corresponding to a terminal fitting described in claims) that is crimped to the core wire 10 exposed from an end of the electric wire 11. It is the electric wire 13 with metal fittings. The female terminal fitting 12 is used by being housed in a cavity of a connector housing (not shown).

(Wire 11)
As shown in FIG. 1, the electric wire 11 includes a core wire 10 formed by twisting a plurality of fine metal wires and an insulating coating 14 made of a synthetic resin that covers the outer periphery of the core wire 10. The core wire 10 can use arbitrary metals as needed, such as aluminum, an aluminum alloy, copper, a copper alloy. In this embodiment, aluminum or an aluminum alloy is used.

(Female terminal fitting 12)
The female terminal fitting 12 is formed by pressing a metal plate material into a predetermined shape. As the metal plate material, any metal such as copper or copper alloy can be used as necessary. In this embodiment, copper or a copper alloy is used.

  As shown in FIG. 2, a bottom plate 15 on which the electric wire 11 is placed, and a pair of insulations that are crimped so as to protrude laterally from the side edge of the bottom plate 15 and wind from the outside of the insulating coating 14 of the electric wire 11. The barrel piece 16 and the side edge of the bottom plate 15 extend laterally from the side edge located on the end portion side (left front side in FIG. 2) of the electric wire 11 with respect to the insulation barrel piece 16 and wind from the outside of the core wire 10. A pair of wire barrel pieces 17 (corresponding to the barrel pieces described in the claims) and a male terminal fitting (not shown) extending from the bottom plate 15 (corresponding to the mating terminals described in the claims) And a connecting portion 18 connected to the. The bottom plate 15 is formed to be elongated in the extending direction of the electric wire 11 (the direction indicated by the arrow A in FIG. 2).

  The connecting portion 18 has a rectangular tube shape, and a male terminal fitting can be inserted. An elastic contact piece 19 that is elastically deformable is formed inside the connecting portion 18, and the elastic contact piece 19 elastically contacts the male terminal fitting, whereby the male terminal fitting and the female terminal fitting 12 are electrically connected. Connected.

  As shown in FIG. 3, the wire barrel piece 17 has a substantially rectangular shape before being crimped to the core wire 10. In a state where the wire barrel piece 17 is crimped to the core wire 10, the electric wire 11 extends in the left-right direction (direction indicated by the arrow A) in FIG. 3.

  Of the bottom plate 15 and the wire barrel piece 17, the surface on the side in contact with the core wire 10 (the front side in the direction passing through the paper surface in FIG. 3) is the contact surface 20. The contact surface 20 of the bottom plate 15 and the wire barrel piece 17 is formed with a plurality of grooves 21 extending in a direction intersecting with the extending direction (the direction indicated by the arrow A in FIG. 3). The groove 21 includes a first groove 22 group extending along a first direction (a direction indicated by an arrow B in FIG. 3) intersecting with the extending direction, and a second direction (which is different from the extending direction while intersecting the first direction). A second groove 23 group extending along a direction indicated by an arrow C in FIG. 3 is formed so as to intersect each other. As shown in FIG. 3, an edge 24 is formed at the opening edge of the groove 21 at the boundary with the contact surface 20.

(Connection structure between the electric wire 11 and the female terminal fitting 12)
As schematically shown in FIG. 5, the bottom plate 15 on which the core wire 10 is placed is placed on the anvil 25 located on the lower side, and the crimper 26 located above the anvil 25 is directed toward the anvil 25. When the wire barrel piece 17 is slidably contacted with the crimper 26 from below, the wire barrel piece 17 is guided to the lower surface of the crimper 26 and is crimped to the core wire 10.

  FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. As shown in FIG. 4, the pair of wire barrel pieces 17 are crimped so as to be wound around the outside of the core wire 10. The edges of the pair of wire barrel pieces 17 are in contact with each other at a position near the center in the width direction (left and right direction in FIG. 4) of the female terminal fitting 12 and outward (upward in FIG. 4). Abut. In FIG. 4, the detailed structure of the core wire 10 is omitted. Further, the structure of the groove 21 formed in the contact surface 20 of the bottom plate 15 and the wire barrel piece 17 is also omitted.

  A pressure is applied to the core wire 10 from the wire barrel piece 17 by being crimped so that the wire barrel piece 17 is wound around the core wire 10. Then, the oxide film formed on the surface of the core wire 10 is broken, and the new surface of the core wire 10 is exposed, and the new surface and the contact surface 20 of the bottom plate 15 and the wire barrel piece 17 come into contact with each other. The metal fitting 12 is electrically connected.

  Further, when the pressure is applied from the wire barrel piece 17, the core wire 10 is plastically deformed and enters the groove 21 formed in the contact surface 20 of the bottom plate 15 and the wire barrel piece 17. Then, the edge 24 formed at the opening edge of the groove 21 and the surface of the core wire 10 are in sliding contact with each other, whereby the oxide film of the core wire 10 is peeled off and the new surface of the core wire 10 is exposed. The new surface and the contact surface 20 of the bottom plate 15 and the wire barrel piece 17 are in contact with each other, so that the electrical connection between the electric wire 11 and the female terminal fitting 12 is ensured.

(Connecting part 27)
As shown in FIG. 3, a portion of the bottom plate 15 that is located closer to the end side (left side in FIG. 3) of the core wire 10 than the wire barrel piece 17 in the extending direction (the direction indicated by the arrow A in FIG. 3); A portion located on the opposite side (right side in FIG. 3) to the end of the core wire 10 in the extending direction is connected by a connecting portion 27. The connecting portion 27 has a shape that is bent twice at a right angle, and has a U-shape.

  The connecting portion 27 is formed on the side edge located on the upper side in FIG. 3 of the bottom plate 15 and also on the side edge located on the lower side. The two connecting portions 27 have the same shape, and are formed symmetrically with respect to the bottom plate 15 extending in the extending direction (the direction indicated by the arrow A in FIG. 3).

  As shown in FIG. 5, the connecting portion 27 does not interfere with the crimper 26 that moves downward to crimp the wire barrel piece 17 to the core wire 10. Specifically, in the connecting portion 27, the length dimension L1 between the edges positioned on the inner side in the width direction of the female terminal fitting 12 (left and right direction in FIG. 5) is greater than the length dimension L2 of the crimper 26 in the width direction. Is also set larger.

  As shown in FIG. 1, after the wire barrel piece 17 is crimped to the core wire 10 and the insulation barrel piece 16 is crimped to the insulating coating 14, the connecting portion 27 is cut, so that A portion located on the end side (left side in FIG. 1) of the core wire 10 from the wire barrel piece 17 in the extending direction (the direction indicated by the arrow A in FIG. 1), and the side opposite to the end portion of the core wire 10 in the extending direction ( A cut portion 28 obtained by cutting the connecting portion 27 is formed on the portion located on the right side in FIG.

  Then, an example of the manufacturing process of this embodiment is demonstrated. First, a metal plate material is press-formed into a predetermined shape. At this time, the groove 21 may be formed.

  Next, the connecting portion 18 is formed by bending the metal plate material. At this time, the groove 21 may be formed. Thereby, the female terminal fitting 12 is formed.

  As shown in FIG. 5, the female terminal fitting 12 is placed on the anvil 25. Subsequently, the insulation coating 14 located at the end of the electric wire 11 is peeled off to expose the core wire 10. The exposed core wire 10 is placed on the bottom plate 15 of the female terminal fitting 12.

  Thereafter, the crimper 26 is moved toward the anvil 25. Then, by being sandwiched between the crimper 26 and the anvil 25, the insulation barrel piece 16 is crimped so as to wrap around the outside of the insulating coating 14 of the electric wire 11, and the wire barrel piece 17 is placed outside the core wire 10. Crimped so that it wraps around. At this time, the connecting portion 27 does not interfere with the crimper 26 that moves downward. Thereafter, the connecting portion 27 is cut. Thereby, the electric wire 13 with a terminal metal fitting is completed.

  Then, the effect | action and effect of this embodiment are demonstrated. According to the present embodiment, pressure is applied to the core wire 10 from the wire barrel piece 17 by being crimped so that the wire barrel piece 17 is wound around the core wire 10. Then, the oxide film formed on the surface of the core wire 10 is broken, and the new surface of the core wire 10 is exposed, and the new surface and the contact surface 20 of the bottom plate 15 and the wire barrel piece 17 come into contact with each other. The metal fitting 12 is electrically connected.

  Further, when the pressure is applied from the wire barrel piece 17, the core wire 10 is plastically deformed and enters the groove 21 formed in the contact surface 20 of the bottom plate 15 and the wire barrel piece 17. Then, the edge 24 formed at the opening edge of the groove 21 and the surface of the core wire 10 are in sliding contact with each other, whereby the oxide film of the core wire 10 is peeled off and the new surface of the core wire 10 is exposed. The new surface and the contact surface 20 of the bottom plate 15 and the wire barrel piece 17 are in contact with each other, so that the electrical connection between the electric wire 11 and the female terminal fitting 12 is ensured.

  Moreover, according to this embodiment, the part located in the edge part side of the electric wire 11 rather than the wire barrel piece 17 about the extending direction among the bottom plates 15 and the edge part of the electric wire 11 opposite to the wire barrel piece 17 about the extending direction. The portion located on the side is connected by a connecting portion 27. By this connection part 27, when crimping the wire barrel piece 17 to the core wire 10, it can suppress that the baseplate 15 extends in the extending direction. Thereby, it can suppress that the length dimension about the extending direction where the electric wire 11 extends the female terminal metal fitting 12 becomes large.

  Further, according to the present embodiment, the pair of connecting portions 27 are formed on the bottom plate 15, and the pair of connecting portions 27 are formed symmetrically with respect to the bottom plate 15. Thereby, when the wire barrel piece 17 is crimped | bonded to the core wire 10, it can suppress that the baseplate 15 is distorted asymmetrically about the extension direction. Thereby, the dimensional stability of the female terminal metal fitting 12 can be improved.

  Moreover, according to this embodiment, the female terminal metal fitting 12 can be reduced in size as a whole by cutting the connecting portion 27.

  In the present embodiment, the core wire 10 is made of aluminum or an aluminum alloy. Thus, when the core wire 10 is made of aluminum or an aluminum alloy, an oxide film is relatively easily formed on the surface of the core wire 10. For this reason, when it is going to peel off the oxide film of the core wire 10, it is necessary to crimp | bond a wire barrel to the core wire 10 with a comparatively big pressure. Then, the wire barrel is also easily plastically deformed. This embodiment is effective when the wire barrel is crimped to the core wire 10 with a relatively strong pressure as described above.

<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 this embodiment, although the connection part 27 was set as the structure cut | disconnected after crimping the wire barrel piece 17 to the core wire 10, you may bend | fold as a reference example . Thereby, the size of the female terminal fitting 12 can be reduced in a state where the connecting portion 27 is connected to the female terminal fitting 12.
(2) In the present embodiment, the connecting portion 27 has a shape that is bent twice at a right angle. However, the connecting portion 27 is not limited to this, and can be semicircular and semi-long if it can escape from the crimper 26 when the wire barrel piece 17 is crimped A circular shape, a triangular shape, or the like may be used as required.
(3) In the present embodiment, the pair of connecting portions 27 is formed on the bottom plate 15. However, as a reference example , if the extension of the bottom plate 15 can be suppressed by one connecting portion 27. The number of connecting portions 27 may be one.
(4) The pair of wire barrel pieces 17 may be crimped to the core wire 10 so as to be displaced from each other in the direction in which the electric wires 11 extend, and three or more wire barrel pieces 17 are alternately formed from the left and right sides. Alternatively, only one wire barrel piece 17 may be formed and crimped to the core wire 10, and the shape of the wire barrel piece 17 may be any shape as necessary.
(5) In the present embodiment, the pair of connecting portions 27 are arranged symmetrically with respect to the bottom plate 15, but as a reference example , for example, when the wire barrel piece 17 is formed asymmetrically with respect to the bottom plate. Corresponding to the wire barrel piece 17, it may be arranged at an asymmetrical position with respect to the bottom plate, and can be arranged at an arbitrary position as required.
(6) In the present embodiment, the terminal fitting is the female terminal fitting 12 having the cylindrical connecting portion 18, but is not limited thereto, and may be a male terminal fitting having a male tab, or penetrating through a metal plate material. A so-called LA terminal in which a hole is formed may be used, and a terminal fitting having an arbitrary shape may be used as necessary.
(7) In the present embodiment, the electric wire 11 is a covered electric wire that covers the outer periphery of the core wire 10 with the insulating coating 14. However, the electric wire 11 is not limited to this, and the shielded electric wire 11 may be used. Can be used. The core wire 10 may be a single core wire 10.
(8) The groove 21 can be formed in any arrangement as required. Further, the groove 21 can be omitted. Moreover, as long as the edge is formed so as to be in sliding contact with the surface of the core wire 11, a concave portion having an arbitrary shape may be formed on the contact surface 20 of the bottom plate 15 or the wire barrel piece 17.

The side view which shows the electric wire with a terminal metal fitting which concerns on one Embodiment of this invention Perspective view showing female terminal fitting The principal part enlarged plan view which shows the state before crimping a wire barrel piece to a core wire IV-IV line sectional view in FIG. The principal part expansion schematic diagram which shows the female terminal metal fitting mounted in the anvil, and a crimper.

Explanation of symbols

10 ... core wire 11 ... electric wire 12 ... female terminal fitting (terminal fitting)
1 5 ... Bottom plate 1 7 ... Wire barrel piece (barrel piece)
1 8 ... connection part 2 7 ... connection part 2 8 ... cutting part
13 ... Electric wire with terminal fitting

Claims (3)

A bottom plate formed by extending in the extending direction of the electric wire while the electric wire is placed thereon, a barrel piece that protrudes laterally from a side edge of the bottom plate and is crimped to be wound around the electric wire, and the bottom plate A connecting portion that extends and connects to the mating terminal fitting, and a portion of the bottom plate that is positioned closer to the end of the wire than the barrel piece in the extending direction and a portion of the electric wire that extends from the barrel piece in the extending direction. A connecting portion that connects the end portion and the portion located on the opposite side ,
A pair of the connecting portions are formed on the bottom plate, and the pair of connecting portions are formed symmetrically with respect to the bottom plate,
A terminal fitting provided with a cut portion formed by cutting the connecting portion at a side edge of the bottom plate . An electric wire including a core wire, and a terminal fitting that is crimped to the core wire exposed from an end of the electric wire,
A bottom plate formed on the core wire and extending in an extending direction of the electric wire; a barrel piece that is protruded laterally from a side edge of the bottom plate so as to be wound around the core wire; and the bottom plate A connecting portion extending from the connecting terminal fitting and the bottom plate, a portion of the bottom plate that is located on the end side of the electric wire with respect to the extending direction and the electric wire with respect to the extending direction. It provided with end and connecting portion connecting the portion located on the opposite side, and
A pair of the connecting portions are formed on the bottom plate, and the pair of connecting portions are formed symmetrically with respect to the bottom plate,
An electric wire with a terminal fitting provided on a side edge of the bottom plate with a cut portion formed by cutting the connecting portion . The electric wire with a terminal fitting according to claim 2, wherein the core wire is made of aluminum or an aluminum alloy.

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