JP5074270B2 - Terminal fitting and wire harness - Google Patents

Description

  The present invention relates to a terminal fitting and a wire harness.

  Conventionally, as a terminal fitting connected to an electric wire, for example, the one described in Patent Document 1 is known. The terminal fitting is made of a metal plate material and includes a crimping portion that is caulked from the outside to a core wire exposed from the end of the electric wire, and a connection portion that is connected to the mating terminal connected to the crimping portion.

  When an oxide film is formed on the surface of the core wire described above, there is a concern that the contact resistance between the core wire and the crimp portion is increased due to the oxide film being interposed between the core wire and the crimp portion.

Therefore, in the prior art, the crimping portion is provided with a protruding piece that protrudes toward the core wire side. The protruding piece is cut and raised substantially perpendicular to the wall surface constituting the crimping portion. When the crimping part is caulked to the core wire of the electric wire, the protruding piece bites into the core wire. Then, as a result of the destruction and removal of the oxide film formed on the surface of the core wire, the contact resistance between the electric wire and the terminal fitting can be reduced.
JP 2003-249285 A

  The core wire is formed by twisting a plurality of strands. For this reason, when the protruding piece bites into the core wire as described above, there is a concern that a part of the wire constituting the core wire is cut by the protruding piece.

  This invention was completed based on the above situations, Comprising: While reducing the contact resistance between electric wires, the terminal metal fitting with which the cutting | disconnection of the strand was suppressed and the wire harness provided with this terminal metal fitting The purpose is to provide.

The present invention is connected to a crimping part made of a metal plate material and connected to a mating terminal metal fitting connected to the crimping part and caulked from the outside to the core wire exposed from an end of an electric wire including a core wire formed by twisting a plurality of strands. A terminal part having a connecting part, wherein the crimping part protrudes to the electric wire side around a rotating shaft extending in a direction intersecting the axial direction of the electric wire, and the electric wire A plurality of projecting portions that are inclined in the thickness direction of the crimping portion are formed in the axial direction of the crimping portion, and the plurality of projecting portions are cut and raised with the end portion side of the electric wire as a rotation shaft. And

Moreover, this invention is a wire harness provided with the electric wire containing the core wire formed by twisting several strands, and the terminal metal fitting connected to the said core wire exposed from the terminal of the said electric wire, Comprising: The said terminal metal fitting Is provided with a crimping portion made of a metal plate material and caulked to the core wire from the outside, and a connection portion connected to the mating terminal fitting connected to the crimping portion, and the crimping portion has an axial direction of the electric wire. and with caused outright projects the wire-side about the rotation axis extending in a direction intersecting, a plurality of protrusions are formed which are inclined with respect to the axial direction of the electric wire in the thickness direction of the crimp portion, the The plurality of protrusions are cut and raised using the end side of the electric wire as a rotation axis .

  When the crimping portion is caulked to the electric wire, the electric wire is pressed by the crimping portion and extends in the axial direction of the electric wire. Then, the electric wire is in sliding contact with the tip of the protruding portion that is cut and raised from the crimping portion toward the electric wire, with the rotation axis extending in the direction intersecting the axial direction of the electric wire as the center. Thereby, the oxide film formed on the surface of the electric wire is peeled off by sliding contact with the tip of the protruding portion, and the new surface of the electric wire is exposed. The contact resistance between the electric wire and the terminal fitting can be reduced by the contact between the new surface and the inner peripheral surface of the crimping portion.

Moreover, according to this invention, the protrusion part inclines in the thickness direction of a crimping | compression-bonding part about the axial direction of an electric wire. For this reason, even if the crimping | compression-bonding part is crimped to an electric wire, the front-end | tip of a protrusion part is slidably contacted with the attitude | position inclined with respect to the core wire. As a result, it is possible to suppress the protrusion from biting into the core wire as compared with the case where the protrusion is cut and raised substantially perpendicular to the wall surface of the crimping portion. Thereby, it can suppress that the strand which comprises a core wire is cut | disconnected.
Furthermore, since the oxide film formed on the surface of the core wire is peeled off at a plurality of locations by being in sliding contact with the plurality of protruding portions, the contact resistance with the terminal fitting of the electric wire can be further reduced.

As embodiments of the present invention, the following embodiments are preferable.
The protrusion height dimension from the wall surface of the said crimping | compression-bonding part of the front-end | tip of the said protrusion part may be set smaller than the diameter of the said strand.

  According to said structure, when crimping | crimping a crimping | compression-bonding part to an electric wire, it can suppress that the front-end | tip of a protrusion part enters into the radial inside of an electric wire rather than the diameter of a strand with respect to a core wire. As a result, it can further suppress that the front-end | tip of a protrusion part cut | disconnects a strand.

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

  In the case where the conductor is made of aluminum or an aluminum alloy, in order to break the oxide film formed on the surface of the conductor and reduce the contact resistance, it is necessary to crimp the crimping portion to the wire core with a high compression rate. In such a case, this configuration is effective.

  ADVANTAGE OF THE INVENTION According to this invention, while reducing the contact resistance between an electric wire and a terminal metal fitting, the cutting | disconnection of the strand which comprises an electric wire can be suppressed.

  An embodiment of the present invention will be described with reference to FIGS. The wire harness 10 according to the present embodiment includes an electric wire 11 and a female terminal fitting 12 (corresponding to a terminal fitting) connected to the end of the electric wire 11.

  As shown in FIG. 1, the electric wire 11 is formed by surrounding an outer periphery of a core wire 13 with an insulating coating 14. The core wire 13 may be made of any metal such as aluminum, aluminum alloy, copper, copper alloy, or the like as necessary. The core wire 13 is formed by twisting a plurality of strands 20. The cross-sectional shape of the strand 20 is circular. The insulation coating 14 is peeled off at the end of the electric wire 11 and the core wire 13 is exposed.

  As shown in FIG. 1, the female terminal fitting 12 is formed by press-molding a metal plate (not shown) into a predetermined shape. The female terminal fitting 12 has an insulation barrel 15 that crimps the insulation coating 14 of the electric wire 11 from outside. A wire barrel 16 (corresponding to a crimping portion) is formed on the left side of the insulation barrel 15 in FIG.

  On the left side of the wire barrel 16 in FIG. 1, a cylindrical connection portion 17 is connected to the wire barrel 16 and is electrically connected by fitting with a male terminal fitting (not shown) (corresponding to a counterpart terminal fitting). Is formed.

  Now, in FIG. 2, the wire barrel 16 in the state before crimping to the electric wire 11 is shown. The surface on the front side in FIG. 2 is the inner side when the electric wire 11 is caulked to the wire barrel 16 and is located on the electric wire 11 side. The wire barrel 16 is formed with a plurality (four in this embodiment) of protruding portions 21 that protrude toward the electric wire 11 when the wire barrel 16 is caulked to the electric wire 11. Each protrusion 21 is a pair of first slits 22 formed along the axial direction of the electric wire 11 (the direction indicated by the arrow A in FIG. 2), and the end of the electric wire 11 is opposite to the first slit 22. By connecting the end portion located on the side (right side in FIG. 2) and being surrounded by the second slit 23 extending in the direction intersecting with the axial direction of the electric wire 11 (direction indicated by arrow B in FIG. 2), the wire Separated from the barrel 16. In the present embodiment, the second slit 23 extends in a direction substantially orthogonal to the axial direction of the electric wire 11.

  Each protrusion 21 is located on the side opposite to the second slit 23 (left side in FIG. 2) and has a rotation axis extending in a direction intersecting the axial direction of the electric wire 11 as a center (on the paper surface in FIG. 2). (Refer to FIG. 3 and FIG. 4).

  As shown in FIG. 3, the protruding portion 21 is inclined inward in the thickness direction of the wire barrel 16 (upward in FIG. 3) in the axial direction of the electric wire 11 (left-right direction in FIG. 3).

  As shown in FIG. 2, the protruding portions 21 are formed side by side with a certain interval in a direction intersecting the axial direction of the electric wire 11. Further, the protruding portions 21 are formed side by side with a certain interval in the axial direction of the electric wire 11.

  Although highlighted in FIG. 3, the protruding height H of the protruding portion 21 from the wall surface of the wire barrel 16 is set to be smaller than the diameter of the strand 20.

  Next, the operation and effect of this embodiment will be described. Below, an example of the attachment process of the female terminal metal fitting 12 with respect to the electric wire 11 is shown. First, a metal plate is formed into a predetermined shape by press molding. At this time, the protruding portion 21 may be formed simultaneously.

  Then, the connection part 17 is formed by bending the metal plate material formed in the predetermined shape. At this time, the protruding portion 21 may be formed.

  Subsequently, the insulation coating 14 of the electric wire 11 is removed to expose the core wire 13. With the core wire 13 placed on the wire barrel 16 and the insulation coating 14 placed on the insulation barrel 15, the barrels 15 and 16 are moved from the outside with respect to the electric wire 11 by a mold (not shown). Close.

  When the wire barrel 16 is caulked to the core wire 13, the core wire 13 is pressed by the wire barrel 16 and is plastically deformed and extends in the axial direction of the electric wire 11. Then, the electric wire 11 is in sliding contact with the distal end of the protruding portion 21 that protrudes from the wire barrel 16 toward the electric wire 11 and is cut and raised about a rotation axis that extends in a direction intersecting the axial direction of the electric wire 11. Thereby, the oxide film formed on the surface of the electric wire 11 is peeled off by being in sliding contact with the tip of the protruding portion 21, and the new surface of the electric wire 11 is exposed. When the new surface and the inner peripheral surface of the wire barrel 16 come into contact with each other, the contact resistance between the electric wire 11 and the terminal fitting can be reduced.

  Further, according to the present embodiment, the protruding portion 21 is inclined in the thickness direction of the wire barrel 16 with respect to the axial direction of the electric wire 11. For this reason, even if the wire barrel 16 is caulked to the electric wire 11, the tip of the protruding portion 21 is in sliding contact with the core wire 13 in an inclined posture. As a result, it is possible to suppress the protrusion 21 from biting into the core wire 13 as compared with the case where the protrusion 21 is cut and raised substantially perpendicular to the wall surface of the wire barrel 16. Thereby, it can suppress that the strand 20 which comprises the core wire 13 is cut | disconnected.

  Further, according to the present embodiment, the protrusion height dimension H from the wall surface of the wire barrel 16 at the tip of the protrusion 21 is set smaller than the diameter of the strand 20. Thereby, when the wire barrel 16 is caulked to the electric wire 11, it is possible to prevent the tip of the protruding portion 21 from entering the inner side in the radial direction of the electric wire 11 with respect to the core wire 13 rather than the diameter of the wire 20. . As a result, it is possible to further suppress the tip of the protruding portion 21 from cutting the strand 20.

  In addition, according to the present embodiment, the oxide film formed on the surface of the core wire 13 is peeled off at a plurality of locations by sliding contact with the plurality of protruding portions 21, so that the contact resistance with the terminal fitting of the electric wire 11 is reduced. It can be made even smaller.

  In addition, when the core wire 13 consists of aluminum or aluminum alloy, in order to break the oxide film formed on the surface of the core wire 13 and to reduce the contact resistance, the wire barrel 16 has a high compression ratio (for example, about 40 to 70%). Must be caulked to the core wire 13. In such a case, the present embodiment is extremely effective. The compression rate is defined by {(conductor area after compression) / (conductor area before compression)} × 100.

<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 present embodiment, the wire barrel 16 has a configuration in which four projecting portions 21 are formed is not limited thereto, as required, two one to three, or five or more projecting It is good also as a structure in which the part 21 is formed.
(2) In the present embodiment, the plurality of protrusions 21 are all configured to be cut and raised with the end portion side of the electric wire 11 as a rotation shaft, but the present invention is not limited thereto . A part of the plurality of protrusions 21 may be cut and raised with the end side of the electric wire 11 as a rotation axis, and the rest may be cut and raised with the opposite side of the end of the electric wire 11 as a rotation axis.
(3) In the present embodiment, the protrusion height dimension H from the wall surface of the wire barrel 16 at the tip of the protrusion 21 is set to be smaller than the diameter of the strand 20, but this is not limitative. Instead, the protrusion height dimension H from the wall surface of the wire barrel 16 at the tip of the protrusion 21 may be set larger than the diameter of the strand 20.
(4) The protrusion height dimensions of the protrusions 21 from the wall surface of the wire barrel 16 may all be the same, or may differ depending on the part where the protrusions 21 are formed.
(5) In the present embodiment, the terminal fitting is the female terminal fitting 12, but is not limited thereto, and may be a male terminal fitting, or a shape in which a through hole penetrating the plate material is formed (so-called LA terminal). It is good. That is, the connection part 17 of a terminal metal fitting can take arbitrary shapes as needed.
(6) In the present embodiment, the electric wire 11 is a covered electric wire. However, the electric wire 11 is not limited to this, and may be a bare electric wire or a shielded electric wire when insulated from the surroundings. Can be used. The conductor of the electric wire may be a core wire of a covered electric wire, or may be a central conductor of a shielded electric wire or a braided wire, and can take any configuration as necessary.
(7) As for the shape of the barrel piece of the insulation barrel 15, three or more may be formed alternately from the left and right sides, or only one may be formed.

The side view which shows the wire harness which concerns on one Embodiment of this invention The principal part enlarged plan view which shows the unfolded state of a female terminal metal fitting Main section enlarged view of female terminal fitting The principal part expansion perspective view which shows a protrusion part

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Wire harness 11 ... Electric wire 12 ... Female terminal metal fitting (terminal metal fitting)
13 ... Core wire 16 ... Wire barrel (crimp part)
17 ... Connection part 20 ... Wire 21 ... Protruding part

Claims (5)

A crimping portion made of a metal plate and caulked from the outside of the core wire exposed from the end of the electric wire including a core wire formed by twisting a plurality of strands, and a connection portion connected to the mating terminal fitting connected to the crimping portion A terminal fitting having
The crimping portion protrudes and is raised and raised about the rotating shaft extending in a direction intersecting the axial direction of the electric wire, and is inclined in the thickness direction of the crimping portion with respect to the axial direction of the electric wire. A plurality of protrusions are formed ,
The plurality of protrusions are cut and raised with the end side of the electric wire as a rotation axis . The terminal fitting according to claim 1, wherein a protruding height dimension of the tip of the protruding portion from the wall surface of the crimping portion is set to be smaller than a diameter of the element wire. A wire harness comprising an electric wire including a core wire formed by twisting a plurality of strands, and a terminal fitting connected to the core wire exposed from the end of the electric wire,
The terminal fitting includes a crimping portion made of a metal plate material and caulked to the core wire from the outside, and a connection portion connected to the mating terminal fitting connected to the crimping portion,
The crimping portion protrudes and is raised and raised about the rotating shaft extending in a direction intersecting the axial direction of the electric wire, and is inclined in the thickness direction of the crimping portion with respect to the axial direction of the electric wire. A plurality of protrusions are formed ,
The wire harness characterized in that the plurality of projecting portions are cut and raised with an end portion side of the electric wire as a rotation axis . The wire harness according to claim 3 , wherein a protruding height dimension of the tip of the protruding portion from the wall surface of the crimping portion is set smaller than a diameter of the strand. The core wire, the wire harness according to any one of claims 3 or claim 4, characterized in that it consists of aluminum or an aluminum alloy.

Images