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WO2024214747A1 - Electric wire-equipped crimp terminal and manufacturing method of crimp terminal with electric wire - Google Patents

Electric wire-equipped crimp terminal and manufacturing method of crimp terminal with electric wire Download PDF

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Publication number
WO2024214747A1
WO2024214747A1 PCT/JP2024/014569 JP2024014569W WO2024214747A1 WO 2024214747 A1 WO2024214747 A1 WO 2024214747A1 JP 2024014569 W JP2024014569 W JP 2024014569W WO 2024214747 A1 WO2024214747 A1 WO 2024214747A1
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WO
WIPO (PCT)
Prior art keywords
core wire
crimping
crimp terminal
bottom plate
electric wire
Prior art date
Application number
PCT/JP2024/014569
Other languages
French (fr)
Japanese (ja)
Inventor
亮 黒石
泰 渥美
匡 藤木
憲昭 蔵城
賢次 宮本
静之 小野
Original Assignee
株式会社オートネットワーク技術研究所
住友電装株式会社
住友電気工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社オートネットワーク技術研究所, 住友電装株式会社, 住友電気工業株式会社 filed Critical 株式会社オートネットワーク技術研究所
Publication of WO2024214747A1 publication Critical patent/WO2024214747A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
    • H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
    • H01R43/048—Crimping apparatus or processes

Definitions

  • This disclosure relates to a crimp terminal with electric wire and a method for manufacturing the crimp terminal with electric wire.
  • a crimp terminal with a wire has been widely adopted, in which a pair of crimping pieces formed on the core wire crimping portion of the crimp terminal are crimped and crimped to a core wire consisting of multiple strands exposed at the end of the wire from which the insulating coating has been stripped, thereby connecting the crimp terminal to the wire.
  • aluminum wires have been used in place of copper wires as wires used in automotive wire harnesses due to their light weight and recyclability. In the case of aluminum wires, a strong oxide coating with high electrical resistance is present on the surface of each strand, which leads to a decrease in electrical performance when connecting terminals.
  • Patent Document 1 proposes ultrasonically connecting the core wire exposed at the end of the aluminum wire before crimping and crimping. According to this, the strands from which the coating such as the oxide film formed on the surface of each strand has been stripped come into contact with each other and are electrically connected, thereby reducing the electrical resistance between the wire and the terminal.
  • Patent Document 1 it is necessary to carry out pre-processing by ultrasonically connecting the core wire exposed at the end of the aluminum electric wire, and then to crimp the core wire with a pair of crimping parts of the core wire crimping part, which inevitably lengthens the manufacturing process and increases manufacturing costs.
  • the objective of the present invention is to provide a crimp terminal with electric wire that can remove the oxide film adhering to the core wire at low cost and enables a stable electrical connection between the crimp terminal and the core wire, and a method for manufacturing the crimp terminal with electric wire.
  • the crimp terminal with electric wire of the present disclosure comprises an electric wire having an internal core wire exposed from an insulating coating at the end, and a crimp terminal having a core wire crimping portion to which the core wire of the electric wire is crimped, the core wire crimping portion of the crimp terminal having a bottom plate portion on which the core wire is placed and a pair of crimping pieces protruding from both sides of the bottom plate portion and crimped to the core wire on the bottom plate portion, the core wire crimping portion having an extrusion protrusion formed by extruding a part of at least one of the bottom plate portion and the crimping pieces toward the core wire in a middle region excluding both side portions in the extension direction of the core wire.
  • the manufacturing method of the crimp terminal with electric wire disclosed herein includes preparing an electric wire having an internal core wire exposed from an insulating coating at the terminal, and a crimp terminal having a core wire crimping portion to which the core wire of the electric wire is crimped, the core wire crimping portion having a bottom plate portion on which the core wire is placed and a pair of crimping pieces protruding from both sides of the bottom plate portion, the core wire of the electric wire is placed on the bottom plate portion, and the pair of crimping pieces are crimped and crimped to the core wire on the bottom plate portion, and after the crimping and crimping, a part of at least one of the bottom plate portion and the crimping pieces is pushed toward the core wire in an intermediate region excluding both side portions in the extension direction of the core wire to form an extrusion protrusion.
  • the present disclosure provides a crimp terminal with electric wire and a method for manufacturing the crimp terminal with electric wire that can remove the oxide film attached to the core wire at low cost and enable a stable electrical connection between the crimp terminal and the core wire.
  • FIG. 1 is an exploded perspective view showing a state before crimping of an electric wire and a crimp terminal constituting an electric wire-attached crimp terminal according to a first embodiment.
  • FIG. FIG. 2 is a plan perspective view of the crimp terminal with electric wire according to the first embodiment, which is formed by crimping the electric wire and the crimp terminal shown in FIG.
  • FIG. 3 is a bottom perspective view of the crimp terminal with electric wire shown in FIG. 2 .
  • 4 is a vertical cross-sectional view of the crimp terminal with electric wire shown in FIG. 2, which corresponds to the cross section taken along line IV-IV in FIG.
  • FIG. 5 is a cross-sectional view corresponding to the VV section of FIG.
  • FIG. 6 is a planar perspective view of the crimp terminal with electric wire according to the second embodiment.
  • FIG. 7 is a cross-sectional view of the crimp terminal with electric wire shown in FIG. 6, and corresponds to FIG.
  • the crimp terminal with electric wire of the present disclosure comprises: (1) An electric wire having an internal core wire exposed from an insulating coating at an end thereof, and a crimp terminal having a core wire crimping portion to which the core wire of the electric wire is crimped, wherein the core wire crimping portion of the crimp terminal has a bottom plate portion on which the core wire is placed and a pair of crimping pieces protruding from both sides of the bottom plate portion and crimped to the core wire on the bottom plate portion, and the core wire crimping portion has an extrusion protrusion formed by extruding a portion of at least one of the bottom plate portion and the crimping pieces toward the core wire in an intermediate region excluding both side portions in the extension direction of the core wire.
  • the core wire crimping portion of the crimp terminal to which the core wire is crimped has an extrusion protrusion formed by extruding a part of at least one of the bottom plate portion and the crimping piece toward the core wire in the middle region excluding both sides in the extension direction of the core wire.
  • the wires are electrically connected by contacting each other, and the electrical resistance between the wire and the terminal can be reduced.
  • the oxide film attached to the core wire can be removed at low cost, and a crimp terminal with electric wire that enables a stable electrical connection between the crimp terminal and the core wire can be provided.
  • the extrusion protrusion is provided in the middle region excluding both side portions in the extension direction of the core wire in the core wire crimping portion, the extrusion protrusion can be provided without both side portions where a bell mouth is likely to occur in the process of crimping the core wire with a pair of crimping pieces.
  • This can prevent a malfunction in which the compressive force by the extrusion protrusion is released at the bell mouth forming portion and the core wires cannot be sufficiently tightly attached to each other, and the extrusion protrusion can stably achieve partial high adhesion between the strands of wires, thereby reliably reducing the electrical resistance between the wire and the terminal. This can suppress an increase in resistance due to the thermal effect in the vehicle.
  • the extrusion protrusion only needs to be provided on a portion of the bottom plate of the core wire crimping portion and at least one of the pair of crimping pieces, and may be provided only on the bottom plate, only on one or both crimping pieces, or on both the bottom plate and the crimping pieces.
  • the extrusion protrusion is disposed in the center of the intermediate region in the extension direction. Since the extrusion protrusion is provided in the center of the intermediate region of the core wire crimping portion in the extension direction of the core wire, it is possible to advantageously prevent the compression force exerted by the extrusion protrusion toward the inside of the core wire crimping portion from escaping to the outside of the core wire crimping portion due to the extension of the core wire, etc. As a result, it is possible to advantageously and stably secure the region where the extrusion protrusion realizes high density between the wires, and it is possible to more advantageously enable a stable electrical connection between the crimp terminal and the core wire.
  • the extrusion protrusion is provided in the intermediate region of the bottom plate portion, and the protruding end face of the extrusion protrusion is arranged to face the tip portions of the pair of crimping pieces inserted inside the core wire in the extrusion direction of the extrusion protrusion.
  • the core wire can be reliably compressed between the extrusion protrusion and the crimping piece.
  • the protruding end face of the extrusion protrusion is arranged to face the tip portions of the pair of crimping pieces inserted inside the core wire.
  • the extrusion protrusion is provided in the intermediate region on the base end side of each of the crimping pieces, and the protruding end face of the extrusion protrusion is arranged to face the tip portion of each of the crimping pieces inserted inside the core wire in the extrusion direction of the extrusion protrusion.
  • the core wire can be reliably compressed between a pair of extrusion protrusions facing each other in the extrusion direction.
  • the protruding end face of each extrusion protrusion is arranged to face the tip portion of each crimping piece inserted inside the core wire.
  • the compression rate of the core wire sandwiched between the extrusion protrusion and the crimping piece can be improved, and a stable electrical connection between the crimp terminal and the core wire due to the high density between the wires by the extrusion protrusion can be more advantageously achieved.
  • by providing an extrusion protrusion on the base end of each of the pair of crimping pieces and clamping the core wire between the respective tip ends it becomes easier to achieve an even compression state between the strands that make up the core wire on the left and right, which makes it possible to more effectively suppress the increase in resistance due to thermal effects in the vehicle compared to when the compression state is uneven.
  • the protruding dimension of the extrusion protrusion from the bottom plate portion or the inner surface of the crimping piece is greater than the depth dimension of the serration from the inner surface. This is because by making the protruding dimension of the extrusion protrusion larger than the depth dimension of the serration that provides resistance to pulling out of the core wire from the core wire crimping portion, the extrusion protrusion can more reliably achieve the effect of improving the adhesion between the strands. More preferably, it is desirable that the protruding dimension of the extrusion protrusion is at least twice the depth dimension of the serration, and even more preferably at least three times.
  • the method for producing a crimp terminal with electric wire includes: (6) A crimp terminal is prepared having an electric wire whose internal core wire is exposed from an insulating coating at a terminal, and a core wire crimping portion to which the core wire of the electric wire is crimped, the core wire crimping portion having a bottom plate portion on which the core wire is placed and a pair of crimping pieces protruding from both sides of the bottom plate portion, the core wire of the electric wire is placed on the bottom plate portion, and the pair of crimping pieces are crimped and crimped to the core wire on the bottom plate portion, and after the crimping and crimping, a portion of at least one of the bottom plate portion and the crimping pieces is pushed toward the core wire in an intermediate region excluding both side portions in the extension direction of the core wire to form an extrusion protrusion.
  • the core wire of the electric wire is placed on the bottom plate of the crimp terminal, and the pair of crimping pieces is crimped toward the bottom plate with the core wire on the bottom plate sandwiched therebetween, and then a part of at least one of the bottom plate and the crimping pieces is pushed toward the core wire in the middle region excluding both sides in the extension direction of the core wire to form an extrusion protrusion.
  • This improves the adhesion between the wires at the part where the extrusion protrusion is pushed toward the core wire in the core wire crimped and placed in the core wire crimping part.
  • the oxide coating between the wires is partially removed and the wires are electrically connected by contacting each other, and the electrical resistance between the electric wire and the terminal can be reduced. Since it is only necessary to extrude a part of the core wire crimping part inward to form the extrusion protrusion after the core wire is crimped, the oxide coating attached to the core wire can be removed at low cost, and a crimp terminal with electric wire that enables a stable electrical connection between the crimp terminal and the core wire can be provided.
  • the extrusion protrusion is provided in the middle region of the core wire crimping portion excluding both side portions in the direction in which the core wire extends, the extrusion protrusion can be provided excluding both side portions where a bell mouth is likely to form in the process of crimping the core wire using a pair of crimping pieces. This allows the press process of forming the extrusion protrusion to be performed regardless of whether a bell mouth is present or not, resulting in excellent workability.
  • the crimp terminal with electric wire 10 includes an electric wire 16 having an inner core wire 12 exposed from an insulating coating 14 at a terminal thereof, and a crimp terminal 20 having a core wire crimping portion 18 to which the core wire 12 of the electric wire 16 is crimped.
  • the electric wire 16 has a core wire 12 as a conductor formed by twisting together a plurality of wires made of aluminum or an aluminum alloy, and the outer periphery of this core wire 12 is covered with an insulating coating 14 made of an insulating material. That is, at the end of the electric wire 16, a predetermined length of the insulating coating 14 is removed to expose the core wire 12.
  • a crimp terminal 20 to be crimped and connected to this electric wire 16 is adapted to be crimped to the core wire 12 exposed at the end of the electric wire 16.
  • the crimp terminal 20 is formed by pressing a flat metal plate into a predetermined shape.
  • a metal having low electrical resistance such as copper or a copper alloy can be appropriately selected.
  • the crimp terminal 20 is preferably plated with tin or nickel.
  • the crimp terminal 20 has a connection portion 22 at one end (front end) in the longitudinal direction, and a core wire crimping portion 18 at the other end (rear end) in the longitudinal direction.
  • the connection portion 22 has a circular flat plate shape, and a bolt insertion hole 24 is formed in the center.
  • the crimp terminal 20 is electrically connected to the device by fastening the connection portion 22 to a connection terminal connected to a device not shown.
  • the core wire crimping portion 18 has a cylindrical shape that opens in the front-rear direction, and the core wire 12 exposed at the end of the electric wire 16 is crimped to the core wire crimping portion 18. In this way, the crimp terminal 20 and the electric wire 16 are electrically connected to each other, forming the electric wire crimp terminal 10 shown in FIG. 2.
  • the core wire crimping portion 18 of the crimp terminal 20 has a bottom plate portion 26 on which the core wire 12 of the electric wire 16 is placed, and a pair of crimping pieces 28, 28 that are connected to both sides of the bottom plate portion 26, protrude from both sides, and are crimped to the core wire 12.
  • a plurality of groove-shaped serrations 32 are provided on an inner surface 30 located between the pair of crimping pieces 28, 28 of the bottom plate portion 26.
  • the core wire 12 enters the serrations 32 to improve conductivity and provide resistance to pulling the core wire 12 out of the core wire crimping portion 18.
  • the crimp terminal with electric wire 10 is configured in a state in which the core wire 12 exposed at the end of the electric wire 16 is crimped to the core wire crimping portion 18 of the crimp terminal 20 in a crimping step in a manufacturing method described below, thereby connecting the electric wire 16 and the crimp terminal 20.
  • the crimp terminal with electric wire 10 further has an extrusion protrusion 34 formed by extruding a part of the bottom plate portion 26 toward the core wire 12 in an intermediate region ⁇ excluding both side portions of the core wire crimping portion 18 in the extending direction of the core wire 12 (left and right direction in Fig. 4).
  • the extrusion protrusion 34 is located within the intermediate region ⁇ of the bottom plate portion 26 of the core wire crimping portion 18, and further in the central portion of the intermediate region ⁇ (see Fig. 4).
  • Such an extrusion protrusion 34 can be formed by press-extruding or stamping a predetermined position of the bottom plate portion 26 from the outside to the inside, i.e., toward the core wire 12, in a press process described later with respect to the core wire crimping portion 18 of the crimp terminal 20 after the crimping process in which the electric wire 16 is crimped.
  • extrusion protrusion 34 in the intermediate region ⁇ of the bottom plate portion 26, it is possible to advantageously avoid a problem in the press process after the crimping process in the manufacturing method described later, in which it becomes difficult to hold the core wire crimping portion 18 with a die in the press process due to the influence of a bell mouth (not shown) that is likely to be provided on both sides of the core wire crimping portion 18 in the crimping process.
  • An open recess 35 is formed in the outer surface 33 of the bottom plate portion 26 in association with the formation of the extrusion protrusion 34.
  • the protrusion dimension L1 of the extrusion protrusion 34 from the inner surface 30 of the bottom plate portion 26 is larger than the depth dimension L2 of the serration 32 from the inner surface 30 of the bottom plate portion 26, and is preferably set to be at least two times, more preferably at least three times, and in this embodiment is set to be at least three times.
  • the extrusion protrusion 34 is provided at approximately the center of the width direction of the bottom plate portion 26 (the left-right direction in FIG. 5 perpendicular to the extension direction of the core wire 12), and the protruding end face 36 of the extrusion protrusion 34 is disposed in the extrusion direction of the extrusion protrusion 34 (upward direction in FIG. 5) facing the tip ends 38, 38 of the pair of crimping pieces 28, 28 inserted inside the core wire 12 by the crimping process. This ensures that the core wire 12 is compressed between the extrusion protrusion 34 and the crimping piece 28.
  • the compression ratio of the core wire 12 sandwiched between the protruding end face 36 of the extrusion protrusion 34 and the tip ends 38, 38 of the pair of crimping pieces 28, 28 is improved.
  • the protruding end face 36 spreads on a plane in a direction perpendicular to the facing direction of the tip ends 38, 38 of the pair of crimping pieces, and a compressive force can be applied to the core wire 12 over a wider range.
  • the electric wire 16 shown in FIG. 1 is prepared by stripping the insulating coating 14 at the end of the electric wire 16 to expose the internal core wire 12.
  • a metal flat plate is pressed and bent to prepare the crimp terminal 20 shown in FIG. 1.
  • the core wire 12 of the electric wire 16 is placed on the bottom plate 26 of the core wire crimping portion 18 of the crimp terminal 20.
  • a crimping process is carried out in which the pair of crimping pieces 28, 28 of the core wire crimping portion 18 are crimped and crimped to the core wire 12 on the bottom plate 26.
  • the core wire crimping portion 18 of the crimp terminal 20 with the core wire 12 of the electric wire 16 placed on the bottom plate portion 26 is placed on a lower die for crimping (not shown), and an upper die for crimping (not shown) is placed on top and pressed, so that the pair of crimping pieces 28, 28 are crimped toward the core wire 12 placed on the bottom plate portion 26.
  • the crimped electric wire 16 and crimp terminal 20 that are connected to each other and obtained in this crimping process are turned upside down.
  • the core wire crimping portion 18 of the crimp terminal 20 to which the core wire 12 is crimped is provided with an extrusion protrusion 34 formed by pushing a portion of the bottom plate portion 26 toward the core wire 12 in the middle region ⁇ excluding both side portions in the extension direction of the core wire 12. Therefore, the adhesion between the wires constituting the core wire 12 can be improved in the portion formed by pushing the extrusion protrusion 34 toward the core wire 12. This high adhesion between the wires allows the oxide film between the wires to be partially removed, and the wires are electrically connected by contacting each other, reducing the electrical resistance between the electric wire 16 and the crimp terminal 20.
  • the oxide film adhering to the core wire can be removed at low cost, and it is possible to provide a wire-attached crimp terminal 10 that enables a stable electrical connection between the crimp terminal 20 and the core wire 12.
  • the extrusion protrusion 34 is located within the intermediate region ⁇ of the bottom plate portion 26 of the core wire crimping portion 18, and is further disposed in the center of the intermediate region ⁇ (see FIG. 3). This advantageously prevents the inward compressive force of the core wire crimping portion 18 caused by the extrusion protrusion 34 from escaping to the outside of the core wire crimping portion 18 due to elongation of the core wire 12, etc. Therefore, the extrusion protrusion 34 advantageously and stably achieves high density between the wires, and more advantageously ensures a stable electrical connection between the crimp terminal and the core wire.
  • the protruding end face 36 of the extrusion protrusion 34 is disposed in the extrusion direction of the extrusion protrusion 34 (upward in Figure 5) facing the tip ends 38, 38 of the pair of crimping pieces 28, 28 inserted inside the core wire 12 by the crimping process.
  • This reliably improves the compression ratio of the core wire 12 sandwiched between the protruding end face 36 of the extrusion protrusion 34 and the tip ends 38, 38 of the pair of crimping pieces 28, 28, and advantageously achieves high density between the strands of wire between the extrusion protrusion 34 and the crimping piece 28.
  • the extrusion protrusion 34 is formed by pushing out a part of the bottom plate 26 of the core wire crimping portion 18 toward the core wire 12, so there is no need to cut out or provide holes in the bottom plate 26 or the crimping piece 28. This prevents the core wire 12 from deforming toward the cutouts or holes, which could cause the compression force applied between the strands by the extrusion protrusion 34 to escape.
  • the protrusion dimension L1 of the extrusion protrusion 34 from the inner surface 30 of the bottom plate portion 26 is set to be greater than the depth dimension L2 of the serration 32 from the inner surface 30, so that the extrusion protrusion 34 can more reliably improve the adhesion between the wires.
  • the crimp terminal with electric wire 40 according to the second embodiment differs from the crimp terminal with electric wire 10 according to the first embodiment in the location where a push-out protrusion 42, which will be described later, is formed.
  • differences between the crimp terminal with electric wire 40 according to the second embodiment and the crimp terminal with electric wire 10 according to the first embodiment will be described, and detailed description of the same members or parts as those according to the first embodiment will be omitted by assigning the same reference numerals in the drawings as those in the first embodiment.
  • the crimp terminal with electric wire 40 has extrusion protrusions 42 formed by extruding a part of each crimping piece 28 toward the core wire 12 in an intermediate region ⁇ excluding both side portions of the core wire crimping portion 18 in the extending direction of the core wire 12 (left and right direction in Fig. 6).
  • the extrusion protrusions 42 are arranged in the intermediate region ⁇ of the base end sides 44, 44 of the crimping pieces 28, 28 arranged opposite to each other on both sides in the width direction of the core wire crimping portion 18, and further in the central portion of the intermediate region ⁇ (see Fig. 6).
  • the core wire crimping portion 18 of the crimp terminal 20 is placed on a lower press die (not shown) in a state in which the crimping pieces 28 of the core wire crimping portion 18 are oriented so as to be arranged upward, and an upper press die (having a protrusion for forming the extrusion protrusions 42) (not shown) is placed on top to perform pressing.
  • an upper press die having a protrusion for forming the extrusion protrusions 42
  • recesses 48 that open onto the outer surfaces 46 of the respective crimping pieces 28 are provided.
  • the protruding end surface 50 of the extrusion protrusion 42 provided on the base end side 44 of each crimping piece 28 in the extrusion direction spreads flatly in a direction perpendicular to the protruding direction, and is disposed opposite the tip end 38 of each crimping piece 28 inserted inside the core wire 12.
  • serrations 32 as in the first embodiment may be provided at appropriate positions on the inner surface 30 of the bottom plate portion 26 and the inner surface 52 of each crimping piece 28.
  • the protruding dimension L1 of the extrusion protrusion 42 from the inner surface 52 of the crimping piece 28 is made larger than the depth dimension L2 of the serrations 32 from the inner surface 30 of the bottom plate portion 26 and the inner surface 52 of the crimping piece 28, preferably two or more times, more preferably three or more times. Even if serrations are not provided, it is preferable that the protruding dimension L1 of the extrusion protrusion 42 is larger than the depth dimension of a general serration.
  • the compression ratio of the core wire 12 sandwiched between the extrusion protrusion 42 and the crimping piece 28 can be improved, and a stable electrical connection between the crimp terminal 20 and the core wire 12 can be more advantageously achieved by increasing the density between the strands by the extrusion protrusion 42.
  • the extrusion protrusion 42 is provided on the base end side 44 of each of the pair of crimping pieces 28 and the core wire 12 can be sandwiched between the respective tip portions 38, it is easy to achieve an even compression state between the strands constituting the core wire 12 on the left and right, and the increase in resistance due to the thermal effect in the vehicle can be more advantageously suppressed compared to the case where the compression state is uneven.
  • the extrusion protrusion 42 is located in the middle region ⁇ and is positioned in its central portion, which prevents the compression force from escaping.
  • the extrusion protrusion 42 is also formed without a notch or hole, which prevents the compression force from escaping, similar to the first embodiment.
  • the extrusion protrusion 34 is extruded at one location on the bottom plate portion 26, but multiple extrusion protrusions 34 may be provided at multiple locations on the bottom plate portion 26.
  • one extrusion protrusion 42 is provided on each crimping piece 28, but multiple extrusion protrusions 34 may be provided on each crimping piece 28, or one or multiple extrusion protrusions 42 may be provided on only one of the crimping pieces 28.
  • the extrusion protrusions 34, 42 are provided on either the bottom plate portion 26 or the crimping piece 28, but they may be provided on both.
  • the serrations 32 are groove-shaped extending in a direction intersecting the extension direction of the core wire 12, but the shape and arrangement of the serrations 32 are not limited to this. For example, they may be concave, and do not need to extend in a groove-like shape, but may be formed of circular or polygonal recesses arranged in a dot pattern. Furthermore, the serrations may be formed on the inner surface of the crimping piece instead of or in addition to the bottom plate portion.
  • Crimp terminal with electric wire (embodiment 1) 12 Core wire 14 Insulating coating 16 Electric wire 18 Core wire crimping portion 20 Crimp terminal 22 Connection portion 24 Bolt insertion hole 26 Bottom plate portion 28 Crimping piece 30 Inner surface (bottom plate portion) 32 Serration 33 External surface (bottom plate) 34: Extrusion protrusion 35: Recessed portion 36: Protruding end surface 38: Tip portion (crimping piece) 40 Crimp terminal with electric wire (embodiment 2) 42: Extrusion protrusion 44: Base end side 46: Outer surface (crimping piece) 48: recessed portion 50: protruding end surface 52: inner surface (crimping piece) ⁇ Intermediate region L1 Projection dimension of extrusion protrusion L2 Depth dimension of serration

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Manufacturing Of Electrical Connectors (AREA)

Abstract

Provided is an electric wire-equipped crimp terminal with which an oxide film adhered to a core wire can be removed at a low cost, and which enables stable electrical connection of the crimp terminal and the core wire.　An electric wire-equipped crimp terminal (10) comprises: an electric wire (16) in which an internal core wire (12) is exposed from an insulation coating (14) at a terminal; and a crimp terminal (20) having a core wire crimp part (18) to which the core wire (12) of the electric wire (16) is crimped. The core wire crimp part (18) of the crimp terminal (20) is provided with a bottom plate part (26) on which the core wire (12) is placed, and a pair of crimping pieces (28, 28) protruding from both sides of the bottom plate part (26) and crimped to the core wire (12) on the bottom plate part (26). The core wire crimp part (18) has an extrusion protrusion (34) formed by extruding a part of at least one of the bottom plate part (26) and the crimping piece (28) toward the core wire (12) in an intermediate region (α) excluding both side portions in the extension direction of the core wire (12).

Description

電線付き圧着端子および電線付き圧着端子の製造方法Crimp terminal with electric wire and method for manufacturing the same
　本開示は、電線付き圧着端子および電線付き圧着端子の製造方法に関する。 This disclosure relates to a crimp terminal with electric wire and a method for manufacturing the crimp terminal with electric wire.
　従来から、圧着端子の芯線圧着部に形成された一対の加締め片が、絶縁被覆を剥がされた電線の端部に露出した複数の素線からなる芯線に加締め圧着されることによって、電線に圧着端子が接続された構造の電線付き圧着端子が広く採用されている。近年では、自動車用のワイヤハーネスに使用されている電線として、軽量性やリサイクル性の良さから銅電線に換えてアルミニウム電線が用いられている。アルミニウム電線の場合、各素線の表面に、強固で電気抵抗の大きい酸化被膜が存在することから、端子を接続する上で通電性能の低下を招く。そこで、特許文献１には、アルミニウム電線の端部に露出した芯線を、加締め圧着する前に超音波接続を行うことが提案されている。これによれば、各素線の表面に形成された酸化膜等の被膜が剥がされた素線同士が互いに接触することで電気的に接続され、電線と端子との間の電気抵抗を小さくできる。 Conventionally, a crimp terminal with a wire has been widely adopted, in which a pair of crimping pieces formed on the core wire crimping portion of the crimp terminal are crimped and crimped to a core wire consisting of multiple strands exposed at the end of the wire from which the insulating coating has been stripped, thereby connecting the crimp terminal to the wire. In recent years, aluminum wires have been used in place of copper wires as wires used in automotive wire harnesses due to their light weight and recyclability. In the case of aluminum wires, a strong oxide coating with high electrical resistance is present on the surface of each strand, which leads to a decrease in electrical performance when connecting terminals. Therefore, Patent Document 1 proposes ultrasonically connecting the core wire exposed at the end of the aluminum wire before crimping and crimping. According to this, the strands from which the coating such as the oxide film formed on the surface of each strand has been stripped come into contact with each other and are electrically connected, thereby reducing the electrical resistance between the wire and the terminal.
特開２００９－２３１０７９号公報JP 2009-231079 A
　しかしながら、特許文献１の構造では、アルミニウム電線の端末に露出した芯線を超音波接続する前処理を行った後で、芯線圧着部の一対の加締め部で芯線を加締め圧着する必要があることから、製造工程の長時間化、製造費用の高コスト化が避けられなかった。 However, with the structure of Patent Document 1, it is necessary to carry out pre-processing by ultrasonically connecting the core wire exposed at the end of the aluminum electric wire, and then to crimp the core wire with a pair of crimping parts of the core wire crimping part, which inevitably lengthens the manufacturing process and increases manufacturing costs.
　そこで、芯線に付着した酸化被膜を低コストで除去することができ、圧着端子と芯線との安定的な電気接続を可能にする電線付き圧着端子および電線付き圧着端子の製造方法を提供することにある。 The objective of the present invention is to provide a crimp terminal with electric wire that can remove the oxide film adhering to the core wire at low cost and enables a stable electrical connection between the crimp terminal and the core wire, and a method for manufacturing the crimp terminal with electric wire.
　本開示の電線付き圧着端子は、端末において内部の芯線が絶縁被覆から露出してなる電線と、前記電線の前記芯線が圧着された芯線圧着部を有する圧着端子と、を備え、前記圧着端子の前記芯線圧着部は、前記芯線が載置される底板部と、前記底板部の両側から突出して前記底板部上の前記芯線に対して加締め圧着された一対の加締め片と、を有し、前記芯線圧着部は、前記芯線の延出方向の両側部分を除く中間領域において、前記底板部および前記加締め片の少なくとも一方における一部を前記芯線に向かって押し出して形成した押出突部を有している、ものである。 The crimp terminal with electric wire of the present disclosure comprises an electric wire having an internal core wire exposed from an insulating coating at the end, and a crimp terminal having a core wire crimping portion to which the core wire of the electric wire is crimped, the core wire crimping portion of the crimp terminal having a bottom plate portion on which the core wire is placed and a pair of crimping pieces protruding from both sides of the bottom plate portion and crimped to the core wire on the bottom plate portion, the core wire crimping portion having an extrusion protrusion formed by extruding a part of at least one of the bottom plate portion and the crimping pieces toward the core wire in a middle region excluding both side portions in the extension direction of the core wire.
　本開示の電線付き圧着端子の製造方法は、端末において内部の芯線が絶縁被覆から露出してなる電線と、前記電線の前記芯線が圧着される芯線圧着部を有する圧着端子を準備し、前記芯線圧着部が、前記芯線が載置される底板部と、前記底板部の両側から突出する一対の加締め片を有しており、前記電線の前記芯線を前記底板部に載置して、前記底板部上の前記芯線に対して前記一対の加締め片を加締め圧着し、前記加締め圧着後に、前記芯線の延出方向での両側部分を除く中間領域において、前記底板部および前記加締め片の少なくとも一方における一部を前記芯線に向かって押し出して押出突部を形成する、ものである。 The manufacturing method of the crimp terminal with electric wire disclosed herein includes preparing an electric wire having an internal core wire exposed from an insulating coating at the terminal, and a crimp terminal having a core wire crimping portion to which the core wire of the electric wire is crimped, the core wire crimping portion having a bottom plate portion on which the core wire is placed and a pair of crimping pieces protruding from both sides of the bottom plate portion, the core wire of the electric wire is placed on the bottom plate portion, and the pair of crimping pieces are crimped and crimped to the core wire on the bottom plate portion, and after the crimping and crimping, a part of at least one of the bottom plate portion and the crimping pieces is pushed toward the core wire in an intermediate region excluding both side portions in the extension direction of the core wire to form an extrusion protrusion.
　本開示によれば、芯線に付着した酸化被膜を低コストで除去することができ、圧着端子と芯線との安定的な電気接続を可能にする電線付き圧着端子および電線付き圧着端子の製造方法を提供することができる。 The present disclosure provides a crimp terminal with electric wire and a method for manufacturing the crimp terminal with electric wire that can remove the oxide film attached to the core wire at low cost and enable a stable electrical connection between the crimp terminal and the core wire.
図１は、実施形態１に係る電線付き圧着端子を構成する電線と圧着端子の圧着前の状態を示す分解斜視図である。FIG. 1 is an exploded perspective view showing a state before crimping of an electric wire and a crimp terminal constituting an electric wire-attached crimp terminal according to a first embodiment. FIG. 図２は、図１に示す電線と圧着端子を圧着してなる実施形態１に係る電線付き圧着端子の平面側斜視図である。FIG. 2 is a plan perspective view of the crimp terminal with electric wire according to the first embodiment, which is formed by crimping the electric wire and the crimp terminal shown in FIG. 図３は、図２に示す電線付き圧着端子の底面側斜視図である。FIG. 3 is a bottom perspective view of the crimp terminal with electric wire shown in FIG. 2 . 図４は、図２に示された電線付き圧着端子の縦断面図であって、図５のＩＶ－ＩＶ断面に相当する縦断面図である。4 is a vertical cross-sectional view of the crimp terminal with electric wire shown in FIG. 2, which corresponds to the cross section taken along line IV-IV in FIG. 図５は、図４のＶ－Ｖ断面に相当する横断面図である。FIG. 5 is a cross-sectional view corresponding to the VV section of FIG. 図６は、実施形態２に係る電線付き圧着端子の平面側斜視図である。FIG. 6 is a planar perspective view of the crimp terminal with electric wire according to the second embodiment. 図７は、図６に示された電線付き圧着端子の横断面図であって、図５に対応する図である。FIG. 7 is a cross-sectional view of the crimp terminal with electric wire shown in FIG. 6, and corresponds to FIG.
＜本開示の実施形態の説明＞
　最初に、本開示の実施態様を列記して説明する。
　本開示の電線付き圧着端子は、
（１）端末において内部の芯線が絶縁被覆から露出してなる電線と、前記電線の前記芯線が圧着された芯線圧着部を有する圧着端子と、を備え、前記圧着端子の前記芯線圧着部は、前記芯線が載置される底板部と、前記底板部の両側から突出して前記底板部上の前記芯線に対して加締め圧着された一対の加締め片と、を有し、前記芯線圧着部は、前記芯線の延出方向での両側部分を除く中間領域において、前記底板部および前記加締め片の少なくとも一方における一部を前記芯線に向かって押し出して形成した押出突部を有している、ものである。 <Description of the embodiments of the present disclosure>
First, embodiments of the present disclosure will be listed and described.
The crimp terminal with electric wire of the present disclosure comprises:
(1) An electric wire having an internal core wire exposed from an insulating coating at an end thereof, and a crimp terminal having a core wire crimping portion to which the core wire of the electric wire is crimped, wherein the core wire crimping portion of the crimp terminal has a bottom plate portion on which the core wire is placed and a pair of crimping pieces protruding from both sides of the bottom plate portion and crimped to the core wire on the bottom plate portion, and the core wire crimping portion has an extrusion protrusion formed by extruding a portion of at least one of the bottom plate portion and the crimping pieces toward the core wire in an intermediate region excluding both side portions in the extension direction of the core wire.
　本開示の電線付き圧着端子によれば、芯線が加締められた圧着端子の芯線圧着部は、芯線の延出方向の両側部分を除く中間領域において、底板部および加締め片の少なくとも一方における一部を前記芯線に向かって押し出して形成した押出突部を有している。これにより、芯線圧着部に加締められて配置された芯線において、押出突部が芯線に向かって押し出されて形成された部位において素線間の密着力を向上させることができる。すなわち、押出突部による部分的な素線間の高密着化は、素線間の酸化被膜を部分的に除去することができる。そして、素線同士が互いに接触することで電気的に接続され、電線と端子との間の電気抵抗を小さくできるのである。要するに、芯線が圧着された芯線圧着部の底板部および加締め片の少なくとも一部を芯線に向かって押し出して押出突部を形成するだけでよいことから、芯線に付着した酸化被膜を低コストで除去することができ、圧着端子と芯線との安定的な電気接続を可能にする電線付き圧着端子を提供できるのである。 According to the disclosed crimp terminal with electric wire, the core wire crimping portion of the crimp terminal to which the core wire is crimped has an extrusion protrusion formed by extruding a part of at least one of the bottom plate portion and the crimping piece toward the core wire in the middle region excluding both sides in the extension direction of the core wire. This makes it possible to improve the adhesion between the wires at the portion formed by extruding the extrusion protrusion toward the core wire in the core wire crimped and arranged in the core wire crimping portion. In other words, the partial increase in adhesion between the wires due to the extrusion protrusion can partially remove the oxide film between the wires. Then, the wires are electrically connected by contacting each other, and the electrical resistance between the wire and the terminal can be reduced. In short, since it is only necessary to extrude at least a part of the bottom plate portion and the crimping piece of the core wire crimping portion to which the core wire is crimped toward the core wire to form the extrusion protrusion, the oxide film attached to the core wire can be removed at low cost, and a crimp terminal with electric wire that enables a stable electrical connection between the crimp terminal and the core wire can be provided.
　特に、押出突部は、芯線圧着部における芯線の延出方向での両側部分を除く中間領域に設けられていることから、一対の加締め片による芯線の圧着工程において、ベルマウスが生じ易い両側部分を外して、押出突部を設けることができる。これにより、押出突部による圧縮力がベルマウス形成部位で逃がされて芯線間を十分に密着できなくなる不具合を未然に防止でき、押出突部による素線間の部分的な高密着化を安定して実現して、電線と端子との間の電気抵抗を確実に小さくすることができる。これにより、車両での熱影響による抵抗の上昇を抑制することができる。また、押出突部は芯線圧着部の底板部および加締め片の少なくとも一方における一部を芯線に向かって押し出して形成しているので、底板部や加締め片を切り欠いたりそれらに穴を設けたりすることがない。それゆえ、それらの切り欠きや穴から押出突部によって素線間に加えられる圧縮力が逃げる不具合が発生することも未然に抑制されている。なお、押出突部は、芯線圧着部の底板部および一対の加締め片の少なくとも一方における一部に設けられていればよく、底板部のみに設けられていてもよいし、一方または両方の加締め片のみに設けられていてもよいし、底板部と加締め片の両方に設けられていてもよい。 In particular, since the extrusion protrusion is provided in the middle region excluding both side portions in the extension direction of the core wire in the core wire crimping portion, the extrusion protrusion can be provided without both side portions where a bell mouth is likely to occur in the process of crimping the core wire with a pair of crimping pieces. This can prevent a malfunction in which the compressive force by the extrusion protrusion is released at the bell mouth forming portion and the core wires cannot be sufficiently tightly attached to each other, and the extrusion protrusion can stably achieve partial high adhesion between the strands of wires, thereby reliably reducing the electrical resistance between the wire and the terminal. This can suppress an increase in resistance due to the thermal effect in the vehicle. In addition, since the extrusion protrusion is formed by extruding a part of at least one of the bottom plate portion and the crimping piece of the core wire crimping portion toward the core wire, there is no need to cut out or provide a hole in the bottom plate portion or the crimping piece. Therefore, the malfunction in which the compressive force applied between the strands of wires by the extrusion protrusion escapes through the cutout or hole is also suppressed. The extrusion protrusion only needs to be provided on a portion of the bottom plate of the core wire crimping portion and at least one of the pair of crimping pieces, and may be provided only on the bottom plate, only on one or both crimping pieces, or on both the bottom plate and the crimping pieces.
（２）上記（１）において、前記押出突部が、前記延出方向における前記中間領域の中央部分に配置されている、ことが好ましい。芯線圧着部の中間領域において芯線の延出方向での中央部分に押出突部が設けられていることから、押出突部による芯線圧着部内方への圧縮力が、芯線の延びなどによって芯線圧着部の外部に逃れることを有利に抑制することができる。その結果、押出突部による素線間の高密度化が実現される領域を有利かつ安定して確保することができ、圧着端子と芯線との安定的な電気接続を一層有利に可能にできる。 (2) In the above (1), it is preferable that the extrusion protrusion is disposed in the center of the intermediate region in the extension direction. Since the extrusion protrusion is provided in the center of the intermediate region of the core wire crimping portion in the extension direction of the core wire, it is possible to advantageously prevent the compression force exerted by the extrusion protrusion toward the inside of the core wire crimping portion from escaping to the outside of the core wire crimping portion due to the extension of the core wire, etc. As a result, it is possible to advantageously and stably secure the region where the extrusion protrusion realizes high density between the wires, and it is possible to more advantageously enable a stable electrical connection between the crimp terminal and the core wire.
（３）上記（１）または（２）において、前記押出突部が、前記底板部の前記中間領域に設けられており、前記押出突部の押出方向で前記押出突部の突出端面が前記芯線の内部に差し込まれた前記一対の加締め片の先端部に対向配置されている、ことが好ましい。底板部に押出突部を設けることで、押出突部と加締め片の間で前記芯線を確実に圧縮することができる。特に、押出突部の突出端面が前記芯線の内部に差し込まれた前記一対の加締め片の先端部に対向配置される。その結果、押出突部と加締め片の間に挟まれる芯線の圧縮率を向上させることができ、押出突部による素線間の高密度化による圧着端子と芯線との安定的な電気接続を一層有利に実現できる。 (3) In the above (1) or (2), it is preferable that the extrusion protrusion is provided in the intermediate region of the bottom plate portion, and the protruding end face of the extrusion protrusion is arranged to face the tip portions of the pair of crimping pieces inserted inside the core wire in the extrusion direction of the extrusion protrusion. By providing the extrusion protrusion on the bottom plate portion, the core wire can be reliably compressed between the extrusion protrusion and the crimping piece. In particular, the protruding end face of the extrusion protrusion is arranged to face the tip portions of the pair of crimping pieces inserted inside the core wire. As a result, the compression rate of the core wire sandwiched between the extrusion protrusion and the crimping piece can be improved, and a stable electrical connection between the crimp terminal and the core wire due to the high density between the strands of wires caused by the extrusion protrusion can be more advantageously achieved.
（４）上記（１）または（２）において、前記押出突部が、各前記加締め片の基端側における前記中間領域に設けられており、前記押出突部の押出方向で前記押出突部の突出端面が前記芯線の内部に差し込まれた各前記加締め片の先端部に対向配置されている、ことが好ましい。各加締め片の基端側に押出突部を設けることで、押出方向で対向する一対の押出突部間で芯線を確実に圧縮することができる。特に、各押出突部の突出端面が芯線の内部に差し込まれた各加締め片の先端部に対向配置される。その結果、押出突部と加締め片の間に挟まれる芯線の圧縮率を向上させることができ、押出突部による素線間の高密度化による圧着端子と芯線との安定的な電気接続を一層有利に実現できる。また、一対の加締め片のそれぞれの基端側に押出突部を設けてそれぞれの先端部との間で芯線を挟持できることから、芯線を構成する素線間の圧縮状態を左右均等に実現することが容易となり、圧縮状態が不均等となる場合に比して車両での熱影響による抵抗の上昇を一層有利に抑えることができる。 (4) In the above (1) or (2), it is preferable that the extrusion protrusion is provided in the intermediate region on the base end side of each of the crimping pieces, and the protruding end face of the extrusion protrusion is arranged to face the tip portion of each of the crimping pieces inserted inside the core wire in the extrusion direction of the extrusion protrusion. By providing an extrusion protrusion on the base end side of each crimping piece, the core wire can be reliably compressed between a pair of extrusion protrusions facing each other in the extrusion direction. In particular, the protruding end face of each extrusion protrusion is arranged to face the tip portion of each crimping piece inserted inside the core wire. As a result, the compression rate of the core wire sandwiched between the extrusion protrusion and the crimping piece can be improved, and a stable electrical connection between the crimp terminal and the core wire due to the high density between the wires by the extrusion protrusion can be more advantageously achieved. In addition, by providing an extrusion protrusion on the base end of each of the pair of crimping pieces and clamping the core wire between the respective tip ends, it becomes easier to achieve an even compression state between the strands that make up the core wire on the left and right, which makes it possible to more effectively suppress the increase in resistance due to thermal effects in the vehicle compared to when the compression state is uneven.
（５）上記（１）または（２）において、前記底板部および前記加締め片の内面の少なくとも一方には、凹状のセレーションが設けられており、前記内面からの前記セレーションの深さ寸法よりも、前記底板部または前記加締め片の前記内面からの前記押出突部の突出寸法の方が大きい、ことが望ましい。芯線に対する芯線加締め部からの引き抜き抵抗を付与するためのセレーションの深さ寸法よりも、押出突部の突出寸法が大きくされることにより、一層確実に押出突部による素線間の密着力向上効果を奏することができるからである。より好ましくは、押出突部の突出寸法がセレーションの深さ寸法の２倍以上、さらに好ましくは３倍以上であることが望ましい。 (5) In the above (1) or (2), it is desirable that at least one of the bottom plate portion and the inner surface of the crimping piece is provided with a concave serration, and that the protruding dimension of the extrusion protrusion from the bottom plate portion or the inner surface of the crimping piece is greater than the depth dimension of the serration from the inner surface. This is because by making the protruding dimension of the extrusion protrusion larger than the depth dimension of the serration that provides resistance to pulling out of the core wire from the core wire crimping portion, the extrusion protrusion can more reliably achieve the effect of improving the adhesion between the strands. More preferably, it is desirable that the protruding dimension of the extrusion protrusion is at least twice the depth dimension of the serration, and even more preferably at least three times.
　本開示の電線付き圧着端子の製造方法は、
（６）端末において内部の芯線が絶縁被覆から露出してなる電線と、前記電線の前記芯線が圧着される芯線圧着部を有する圧着端子を準備し、前記芯線圧着部が、前記芯線が載置される底板部と、前記底板部の両側から突出する一対の加締め片を有しており、前記電線の前記芯線を前記底板部に載置して、前記底板部上の前記芯線に対して前記一対の加締め片を加締め圧着し、前記加締め圧着後に、前記芯線の延出方向の両側部分を除く中間領域において、前記底板部および前記加締め片の少なくとも一方における一部を前記芯線に向かって押し出して押出突部を形成する、ものである。 The method for producing a crimp terminal with electric wire according to the present disclosure includes:
(6) A crimp terminal is prepared having an electric wire whose internal core wire is exposed from an insulating coating at a terminal, and a core wire crimping portion to which the core wire of the electric wire is crimped, the core wire crimping portion having a bottom plate portion on which the core wire is placed and a pair of crimping pieces protruding from both sides of the bottom plate portion, the core wire of the electric wire is placed on the bottom plate portion, and the pair of crimping pieces are crimped and crimped to the core wire on the bottom plate portion, and after the crimping and crimping, a portion of at least one of the bottom plate portion and the crimping pieces is pushed toward the core wire in an intermediate region excluding both side portions in the extension direction of the core wire to form an extrusion protrusion.
　本開示の電線付き圧着端子の製造方法によれば、電線の芯線を圧着端子の底板部に載置して、底板部上の芯線を間に挟んで底板部に向かって一対の加締め片を加締め圧着した後に、芯線の延出方向の両側部分を除く中間領域において、底板部および加締め片の少なくとも一方における一部を芯線に向かって押し出して押出突部を形成することを行う。これにより、芯線圧着部に加締められて配置された芯線において、押出突部が芯線に向かって押し出されて形成された部位において素線間の密着力を向上させることができる。その結果、素線間の酸化被膜を部分的に除去して素線同士を互いに接触することで電気的に接続させ、電線と端子との間の電気抵抗を小さくできるのである。芯線の加締め圧着後に、芯線圧着部の一部を内方に押し出して押出突部を形成するだけでよいことから、芯線に付着した酸化被膜を低コストで除去することができ、圧着端子と芯線との安定的な電気接続を可能にする電線付き圧着端子を提供できるのである。 According to the manufacturing method of the crimp terminal with electric wire disclosed herein, the core wire of the electric wire is placed on the bottom plate of the crimp terminal, and the pair of crimping pieces is crimped toward the bottom plate with the core wire on the bottom plate sandwiched therebetween, and then a part of at least one of the bottom plate and the crimping pieces is pushed toward the core wire in the middle region excluding both sides in the extension direction of the core wire to form an extrusion protrusion. This improves the adhesion between the wires at the part where the extrusion protrusion is pushed toward the core wire in the core wire crimped and placed in the core wire crimping part. As a result, the oxide coating between the wires is partially removed and the wires are electrically connected by contacting each other, and the electrical resistance between the electric wire and the terminal can be reduced. Since it is only necessary to extrude a part of the core wire crimping part inward to form the extrusion protrusion after the core wire is crimped, the oxide coating attached to the core wire can be removed at low cost, and a crimp terminal with electric wire that enables a stable electrical connection between the crimp terminal and the core wire can be provided.
　特に、押出突部は、芯線圧着部における芯線の延出方向での両側部分を除く中間領域に設けられていることから、一対の加締め片による芯線の圧着工程において、ベルマウスが生じ易い両側部分を外して、押出突部を設けることができる。これにより、ベルマウスの有無にかかわらず押出突部を形成するプレス工程を実行することができ、作業性に優れている。さらに、押出突部による圧縮力がベルマウス形成部位で逃がされて芯線間を十分に密着できなくなる不具合を未然に防止でき、押出突部による素線間の部分的な高密着化を安定して実現して、電線と端子との間の電気抵抗を確実に小さくすることができる。 In particular, since the extrusion protrusion is provided in the middle region of the core wire crimping portion excluding both side portions in the direction in which the core wire extends, the extrusion protrusion can be provided excluding both side portions where a bell mouth is likely to form in the process of crimping the core wire using a pair of crimping pieces. This allows the press process of forming the extrusion protrusion to be performed regardless of whether a bell mouth is present or not, resulting in excellent workability. Furthermore, it is possible to prevent problems in which the compressive force from the extrusion protrusion is released at the bell mouth formation portion, making it impossible to achieve sufficient adhesion between the core wires, and the extrusion protrusion stably achieves high partial adhesion between the strands, thereby reliably reducing the electrical resistance between the electric wire and the terminal.
＜本開示の実施形態の詳細＞
　本開示の電線付き圧着端子の具体例を、以下に図面を参照しつつ説明する。なお、本開示は、これらの例示に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 <Details of the embodiment of the present disclosure>
Specific examples of the crimp terminal with electric wire of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.
＜実施形態１＞
　以下、本開示の実施形態１の電線付き圧着端子１０について、図１から図５を用いて説明する。電線付き圧着端子１０は、端末において内部の芯線１２が絶縁被覆１４から露出してなる電線１６と、電線１６の芯線１２が圧着される芯線圧着部１８を有する圧着端子２０と、を備えて構成されている。 <Embodiment 1>
Hereinafter, a crimp terminal with electric wire 10 according to a first embodiment of the present disclosure will be described with reference to Fig. 1 to Fig. 5. The crimp terminal with electric wire 10 includes an electric wire 16 having an inner core wire 12 exposed from an insulating coating 14 at a terminal thereof, and a crimp terminal 20 having a core wire crimping portion 18 to which the core wire 12 of the electric wire 16 is crimped.
＜電線１６＞
　図１に示すように、電線１６は、アルミニウム製またはアルミニウム合金製の複数の素線が撚り合わされて成る導体部としての芯線１２を有し、この芯線１２の外周は絶縁材料で形成された絶縁被覆１４で覆われている。すなわち、電線１６は、その端末において、所定の長さで絶縁被覆１４が除去されて芯線１２が露出している。この電線１６に圧着接続される圧着端子２０は、電線１６の端末に露出した芯線１２に加締め圧着されるようになっている。 <Electric wire 16>
1, the electric wire 16 has a core wire 12 as a conductor formed by twisting together a plurality of wires made of aluminum or an aluminum alloy, and the outer periphery of this core wire 12 is covered with an insulating coating 14 made of an insulating material. That is, at the end of the electric wire 16, a predetermined length of the insulating coating 14 is removed to expose the core wire 12. A crimp terminal 20 to be crimped and connected to this electric wire 16 is adapted to be crimped to the core wire 12 exposed at the end of the electric wire 16.
＜圧着端子２０＞
　圧着端子２０は、平板状の金属平板を所定の形状にプレス加工してなる。金属平板を構成する金属としては、銅、銅合金等の電気抵抗が低い金属を適宜に選択することができる。圧着端子２０には、錫もしくはニッケルメッキが施されていることが好ましい。圧着端子２０は、長手方向の一端部（前端部）に接続部２２が設けられ、長手方向の他端部（後端部）に芯線圧着部１８が設けられている。接続部２２は円形平板形状を有しており、中央部にボルト挿通孔２４が貫設されている。図示しない機器に接続された接続端子に対して接続部２２をボルト締結することにより、圧着端子２０が機器に対して電気的に接続されるようになっている。芯線圧着部１８は、前後方向に開口する円筒形状を有しており、電線１６の端末に露出した芯線１２が芯線圧着部１８に圧着される。これにより、圧着端子２０と電線１６が電気的に接続された、図２に示す電線付き圧着端子１０が構成されている。 <Crimp terminal 20>
The crimp terminal 20 is formed by pressing a flat metal plate into a predetermined shape. As the metal constituting the metal plate, a metal having low electrical resistance such as copper or a copper alloy can be appropriately selected. The crimp terminal 20 is preferably plated with tin or nickel. The crimp terminal 20 has a connection portion 22 at one end (front end) in the longitudinal direction, and a core wire crimping portion 18 at the other end (rear end) in the longitudinal direction. The connection portion 22 has a circular flat plate shape, and a bolt insertion hole 24 is formed in the center. The crimp terminal 20 is electrically connected to the device by fastening the connection portion 22 to a connection terminal connected to a device not shown. The core wire crimping portion 18 has a cylindrical shape that opens in the front-rear direction, and the core wire 12 exposed at the end of the electric wire 16 is crimped to the core wire crimping portion 18. In this way, the crimp terminal 20 and the electric wire 16 are electrically connected to each other, forming the electric wire crimp terminal 10 shown in FIG. 2.
　より詳しくは、圧着端子２０の芯線圧着部１８は、電線１６の芯線１２が載置される底板部２６と、この底板部２６の両側に連接して両側から突出して、芯線１２に加締め圧着される一対の加締め片２８，２８と、を有している。図１および図４に示すように、底板部２６の一対の加締め片２８，２８間に位置する内面３０には、複数の凹溝状のセレーション３２が設けられている。これにより、一対の加締め片２８が芯線１２を間に挟んで底板部２６に向かって加締め圧着された際に、芯線１２がセレーション３２に入り込んで導電性を向上させたり、芯線１２の芯線圧着部１８からの引き抜き抵抗が付与されるようになっている。 More specifically, the core wire crimping portion 18 of the crimp terminal 20 has a bottom plate portion 26 on which the core wire 12 of the electric wire 16 is placed, and a pair of crimping pieces 28, 28 that are connected to both sides of the bottom plate portion 26, protrude from both sides, and are crimped to the core wire 12. As shown in Figures 1 and 4, a plurality of groove-shaped serrations 32 are provided on an inner surface 30 located between the pair of crimping pieces 28, 28 of the bottom plate portion 26. As a result, when the pair of crimping pieces 28 are crimped toward the bottom plate portion 26 with the core wire 12 sandwiched therebetween, the core wire 12 enters the serrations 32 to improve conductivity and provide resistance to pulling the core wire 12 out of the core wire crimping portion 18.
＜電線付き圧着端子１０＞
　電線付き圧着端子１０は、図２に示すように、電線１６の端末に露出した芯線１２が、後述する製造方法における圧着工程において、圧着端子２０の芯線圧着部１８に圧着されることで、電線１６と圧着端子２０が連結された状態で構成されている。図３から図５に示すように、電線付き圧着端子１０は、さらに、芯線１２の延出方向（図４の左右方向）における芯線圧着部１８の両側部分を除く中間領域αにおいて、底板部２６の一部を芯線１２に向かって押し出して形成した押出突部３４を有している。本実施形態では、芯線圧着部１８の底板部２６の中間領域α内にあって、さらに中間領域αの中央部分に押出突部３４が配置されている（図４参照）。このような押出突部３４は、電線１６が圧着された圧着工程後の圧着端子２０の芯線圧着部１８に対して、後述するプレス工程において、底板部２６の所定の位置を、外方から内方、すなわち、芯線１２に向かってプレス押し出しまたは打ち出しすることにより、形成することができる。なお、押出突部３４が、底板部２６の中間領域α内に設けられることにより、後述する製造方法において、圧着工程後のプレス工程において、圧着工程で芯線圧着部１８の両側部分に設けられやすい図示しないベルマウスなどの影響により、プレス工程で芯線圧着部１８を金型で保持することが困難になる問題を有利に回避することができる。なお、底板部２６の外面３３には、押出突部３４の形成に伴って設けられた凹み部３５が開口して形成されている。 <Crimp terminal 10 with electric wire>
As shown in Fig. 2, the crimp terminal with electric wire 10 is configured in a state in which the core wire 12 exposed at the end of the electric wire 16 is crimped to the core wire crimping portion 18 of the crimp terminal 20 in a crimping step in a manufacturing method described below, thereby connecting the electric wire 16 and the crimp terminal 20. As shown in Figs. 3 to 5, the crimp terminal with electric wire 10 further has an extrusion protrusion 34 formed by extruding a part of the bottom plate portion 26 toward the core wire 12 in an intermediate region α excluding both side portions of the core wire crimping portion 18 in the extending direction of the core wire 12 (left and right direction in Fig. 4). In this embodiment, the extrusion protrusion 34 is located within the intermediate region α of the bottom plate portion 26 of the core wire crimping portion 18, and further in the central portion of the intermediate region α (see Fig. 4). Such an extrusion protrusion 34 can be formed by press-extruding or stamping a predetermined position of the bottom plate portion 26 from the outside to the inside, i.e., toward the core wire 12, in a press process described later with respect to the core wire crimping portion 18 of the crimp terminal 20 after the crimping process in which the electric wire 16 is crimped. By providing the extrusion protrusion 34 in the intermediate region α of the bottom plate portion 26, it is possible to advantageously avoid a problem in the press process after the crimping process in the manufacturing method described later, in which it becomes difficult to hold the core wire crimping portion 18 with a die in the press process due to the influence of a bell mouth (not shown) that is likely to be provided on both sides of the core wire crimping portion 18 in the crimping process. An open recess 35 is formed in the outer surface 33 of the bottom plate portion 26 in association with the formation of the extrusion protrusion 34.
　図４に示すように、押出突部３４における底板部２６の内面３０からの突出寸法：Ｌ１は、セレーション３２における底板部２６の内面３０からの深さ寸法：Ｌ２よりも大きくされており、好ましくは、２倍以上、より好ましくは３倍以上とされ、本実施形態では３倍以上に設定されている。 As shown in FIG. 4, the protrusion dimension L1 of the extrusion protrusion 34 from the inner surface 30 of the bottom plate portion 26 is larger than the depth dimension L2 of the serration 32 from the inner surface 30 of the bottom plate portion 26, and is preferably set to be at least two times, more preferably at least three times, and in this embodiment is set to be at least three times.
　図５に示すように、押出突部３４は、底板部２６の幅方向（芯線１２の延出方向に直交する図５の左右方向）の略中央部分に設けられており、押出突部３４の押出方向（図５の上方向）で押出突部３４の突出端面３６が、圧着工程によって芯線１２の内部に差し込まれた一対の加締め片２８，２８の先端部３８，３８に対向配置されている。これにより、押出突部３４と加締め片２８の間で芯線１２を確実に圧縮することができる。特に、押出突部３４の突出端面３６と一対の加締め片２８，２８の先端部３８，３８の間に挟まれる芯線１２の圧縮率を確実に向上させることができる。なお、突出端面３６は、一対の加締め片の先端部３８，３８への対向方向に直交する方向で平面上に広がっており、より広い範囲で芯線１２に対して圧縮力を加えることができる。 As shown in FIG. 5, the extrusion protrusion 34 is provided at approximately the center of the width direction of the bottom plate portion 26 (the left-right direction in FIG. 5 perpendicular to the extension direction of the core wire 12), and the protruding end face 36 of the extrusion protrusion 34 is disposed in the extrusion direction of the extrusion protrusion 34 (upward direction in FIG. 5) facing the tip ends 38, 38 of the pair of crimping pieces 28, 28 inserted inside the core wire 12 by the crimping process. This ensures that the core wire 12 is compressed between the extrusion protrusion 34 and the crimping piece 28. In particular, it ensures that the compression ratio of the core wire 12 sandwiched between the protruding end face 36 of the extrusion protrusion 34 and the tip ends 38, 38 of the pair of crimping pieces 28, 28 is improved. The protruding end face 36 spreads on a plane in a direction perpendicular to the facing direction of the tip ends 38, 38 of the pair of crimping pieces, and a compressive force can be applied to the core wire 12 over a wider range.
＜電線付き圧着端子１０の製造方法＞
　以下、電線付き圧着端子１０の製造方法の具体的な一例を説明する。 <Method of manufacturing the crimp terminal with electric wire 10>
A specific example of a method for manufacturing the crimp terminal 10 with electric wire will be described below.
　先ず、電線１６の端末における絶縁被覆１４を剥いで内部の芯線１２を露出させることにより、図１に示す電線１６を準備する。また、金属平板をプレス加工および折り曲げ加工することにより、図１に示す圧着端子２０を準備する。続いて、電線１６の芯線１２を圧着端子２０の芯線圧着部１８の底板部２６に載置する。この状態で、底板部２６上の芯線１２に対して芯線圧着部１８の一対の加締め片２８，２８を加締め圧着する圧着工程を実行する。 First, the electric wire 16 shown in FIG. 1 is prepared by stripping the insulating coating 14 at the end of the electric wire 16 to expose the internal core wire 12. A metal flat plate is pressed and bent to prepare the crimp terminal 20 shown in FIG. 1. Next, the core wire 12 of the electric wire 16 is placed on the bottom plate 26 of the core wire crimping portion 18 of the crimp terminal 20. In this state, a crimping process is carried out in which the pair of crimping pieces 28, 28 of the core wire crimping portion 18 are crimped and crimped to the core wire 12 on the bottom plate 26.
　より詳細には、底板部２６に電線１６の芯線１２が載置された状態の圧着端子２０の芯線圧着部１８を図示しない圧着用の下金型に載置し、上方から図示しない圧着用の上金型を重ねてプレス加工を施すことにより、一対の加締め片２８，２８が、底板部２６に載置された芯線１２に向かって加締め圧着される。続いて、この圧着工程で得られた相互に連結された圧着後の電線１６および圧着端子２０の上下を反転させる。すなわち、図３に示すように芯線圧着部１８の底板部２６が上方に配置されるように配向した状態で、押出突部３４をプレス押し出し（打ち出し）するプレス工程を実行する。要するに、芯線圧着部１８の底板部２６が上方に配置されるように配向した状態で、圧着端子２０の芯線圧着部１８を図示しないプレス用の下金型に載置し、上方から図示しないプレス用の上金型（押出突部３４形成用の突起を有するもの）を重ねてプレス加工を施す。これにより、芯線圧着部１８の底板部２６の所定の部位が、芯線１２に向かって押し出され、図３から図５に示す押出突部３４が形成される。押出突部３４の形成に伴って、底板部２６の外面３３に開口する凹み部３５が設けられる。 More specifically, the core wire crimping portion 18 of the crimp terminal 20 with the core wire 12 of the electric wire 16 placed on the bottom plate portion 26 is placed on a lower die for crimping (not shown), and an upper die for crimping (not shown) is placed on top and pressed, so that the pair of crimping pieces 28, 28 are crimped toward the core wire 12 placed on the bottom plate portion 26. Next, the crimped electric wire 16 and crimp terminal 20 that are connected to each other and obtained in this crimping process are turned upside down. That is, with the bottom plate portion 26 of the core wire crimping portion 18 oriented so that it is positioned upward as shown in Figure 3, a pressing process is performed in which the extrusion protrusion 34 is press-extruded (hammered out). In short, the core wire crimping portion 18 of the crimp terminal 20 is placed on a lower press die (not shown) with the bottom plate portion 26 of the core wire crimping portion 18 oriented so as to be positioned upward, and a press working is performed by placing an upper press die (not shown) (having a protrusion for forming the extrusion protrusion 34) on top from above. As a result, a predetermined portion of the bottom plate portion 26 of the core wire crimping portion 18 is extruded toward the core wire 12, forming the extrusion protrusion 34 shown in Figures 3 to 5. As the extrusion protrusion 34 is formed, a recessed portion 35 that opens into the outer surface 33 of the bottom plate portion 26 is provided.
　このようにして得られた本実施形態の電線付き圧着端子１０においては、芯線圧着部１８の底板部２６上に載置された芯線１２に対して一対の加締め片２８，２８を加締め圧着する圧着工程の後に、芯線圧着部１８の底板部２６の所定の部位を芯線１２に向かって押し出して押出突部３４をプレス形成するプレス工程が実行される。これにより得られた電線付き圧着端子１０では、芯線１２が加締められた圧着端子２０の芯線圧着部１８は、芯線１２の延出方向の両側部分を除く中間領域αにおいて、底板部２６の一部を芯線１２に向かって押し出して形成した押出突部３４が設けられている。それゆえ、押出突部３４が芯線１２に向かって押し出されて形成された部位において芯線１２を構成する素線間の密着力を向上させることができる。この素線間の高密着化により、素線間の酸化被膜を部分的に除去することができ、素線同士が互いに接触することで電気的に接続され、電線１６と圧着端子２０との間の電気抵抗を小さくできるのである。特に、圧着工程の後に芯線圧着部１８に対してプレス工程を実施して押出突部３４を形成するだけでよいことから、芯線に付着した酸化被膜を低コストで除去することができ、圧着端子２０と芯線１２との安定的な電気接続を可能にする電線付き圧着端子１０を提供できるのである。 In the crimp terminal with electric wire 10 of this embodiment obtained in this manner, after the crimping process in which the pair of crimping pieces 28, 28 are crimped to the core wire 12 placed on the bottom plate portion 26 of the core wire crimping portion 18, a pressing process is carried out in which a predetermined portion of the bottom plate portion 26 of the core wire crimping portion 18 is pushed toward the core wire 12 to press-form an extrusion protrusion 34. In the crimp terminal with electric wire 10 obtained in this manner, the core wire crimping portion 18 of the crimp terminal 20 to which the core wire 12 is crimped is provided with an extrusion protrusion 34 formed by pushing a portion of the bottom plate portion 26 toward the core wire 12 in the middle region α excluding both side portions in the extension direction of the core wire 12. Therefore, the adhesion between the wires constituting the core wire 12 can be improved in the portion formed by pushing the extrusion protrusion 34 toward the core wire 12. This high adhesion between the wires allows the oxide film between the wires to be partially removed, and the wires are electrically connected by contacting each other, reducing the electrical resistance between the electric wire 16 and the crimp terminal 20. In particular, since it is only necessary to perform a pressing process on the core wire crimping portion 18 after the crimping process to form the extrusion protrusion 34, the oxide film adhering to the core wire can be removed at low cost, and it is possible to provide a wire-attached crimp terminal 10 that enables a stable electrical connection between the crimp terminal 20 and the core wire 12.
　また、押出突部３４は、芯線圧着部１８の底板部２６の中間領域α内にあって、さらに中間領域αの中央部分に押出突部３４が配置されている（図３参照）。これにより、押出突部３４による芯線圧着部１８の内方への圧縮力が、芯線１２の延びなどによって芯線圧着部１８の外部に逃れることを有利に抑制することができる。それゆえ、押出突部３４による素線間の高密度化を有利かつ安定して実現することができ、圧着端子と芯線との安定的な電気接続を一層有利に確保できる。 The extrusion protrusion 34 is located within the intermediate region α of the bottom plate portion 26 of the core wire crimping portion 18, and is further disposed in the center of the intermediate region α (see FIG. 3). This advantageously prevents the inward compressive force of the core wire crimping portion 18 caused by the extrusion protrusion 34 from escaping to the outside of the core wire crimping portion 18 due to elongation of the core wire 12, etc. Therefore, the extrusion protrusion 34 advantageously and stably achieves high density between the wires, and more advantageously ensures a stable electrical connection between the crimp terminal and the core wire.
　特に、実施形態１では、図５に示すように、押出突部３４の押出方向（図５の上方向）で押出突部３４の突出端面３６が、圧着工程によって芯線１２の内部に差し込まれた一対の加締め片２８，２８の先端部３８，３８に対向配置されている。これにより、押出突部３４の突出端面３６と一対の加締め片２８，２８の先端部３８，３８の間に挟まれる芯線１２の圧縮率を確実に向上させて、押出突部３４と加締め片２８の間で素線間の高密度化を有利に実現できる。 In particular, in the first embodiment, as shown in Figure 5, the protruding end face 36 of the extrusion protrusion 34 is disposed in the extrusion direction of the extrusion protrusion 34 (upward in Figure 5) facing the tip ends 38, 38 of the pair of crimping pieces 28, 28 inserted inside the core wire 12 by the crimping process. This reliably improves the compression ratio of the core wire 12 sandwiched between the protruding end face 36 of the extrusion protrusion 34 and the tip ends 38, 38 of the pair of crimping pieces 28, 28, and advantageously achieves high density between the strands of wire between the extrusion protrusion 34 and the crimping piece 28.
　ここで、押出突部３４は、芯線圧着部１８の底板部２６の一部を芯線１２に向かって押し出すことで形成されているので、底板部２６や加締め片２８を切り欠いたりそれらに穴を設けたりすることがない。それゆえ、それらの切り欠きや穴に向かって芯線１２が変形して、押出突部３４によって素線間に加えられる圧縮力が逃げる不具合が発生することも未然に抑制されている。 Here, the extrusion protrusion 34 is formed by pushing out a part of the bottom plate 26 of the core wire crimping portion 18 toward the core wire 12, so there is no need to cut out or provide holes in the bottom plate 26 or the crimping piece 28. This prevents the core wire 12 from deforming toward the cutouts or holes, which could cause the compression force applied between the strands by the extrusion protrusion 34 to escape.
　加えて、底板部２６の内面３０からの押出突部３４の突出寸法：Ｌ１が、セレーション３２の内面３０からの深さ寸法：Ｌ２よりも大きくされていることから、一層確実に押出突部３４による素線間の密着力向上効果を得ることができる。 In addition, the protrusion dimension L1 of the extrusion protrusion 34 from the inner surface 30 of the bottom plate portion 26 is set to be greater than the depth dimension L2 of the serration 32 from the inner surface 30, so that the extrusion protrusion 34 can more reliably improve the adhesion between the wires.
＜実施形態２＞
　続いて、本開示の実施形態２の電線付き圧着端子４０について、図６および図７に基づいて説明する。実施形態２の電線付き圧着端子４０は、実施形態１の電線付き圧着端子１０に対して、後述する押出突部４２の形成部位が異なっている。以下の説明では、実施形態２の電線付き圧着端子４０において実施形態１における電線付き圧着端子１０と異なる点について説明するとともに、実施形態１と同一の部材または部位には、図中に、実施形態１と同一の符号を付すことにより詳細な説明を省略する。 <Embodiment 2>
Next, a description will be given of a crimp terminal with electric wire 40 according to a second embodiment of the present disclosure with reference to Fig. 6 and Fig. 7. The crimp terminal with electric wire 40 according to the second embodiment differs from the crimp terminal with electric wire 10 according to the first embodiment in the location where a push-out protrusion 42, which will be described later, is formed. In the following description, differences between the crimp terminal with electric wire 40 according to the second embodiment and the crimp terminal with electric wire 10 according to the first embodiment will be described, and detailed description of the same members or parts as those according to the first embodiment will be omitted by assigning the same reference numerals in the drawings as those in the first embodiment.
＜電線付き圧着端子４０＞
　電線付き圧着端子４０は、図６に示すように、芯線１２の延出方向（図６の左右方向）における芯線圧着部１８の両側部分を除く中間領域αにおいて、各加締め片２８の一部を芯線１２に向かって押し出して形成した押出突部４２を有している。実施形態２では、芯線圧着部１８の幅方向両側に対向配置された加締め片２８，２８の基端側４４，４４の中間領域α内にあって、さらに中間領域αの中央部分に押出突部４２が配置されている（図６参照）。なお、各押出突部４２は、上述のプレス工程において、芯線圧着部１８の各加締め片２８が上方に配置されるように配向した状態で、圧着端子２０の芯線圧着部１８を図示しないプレス用の下金型に載置し、上方から図示しないプレス用の上金型（押出突部４２形成用の突起を有するもの）を重ねてプレス加工を施すことにより、形成される。押出突部４２の形成に伴って、各加締め片２８の外面４６に開口する凹み部４８が設けられる。 <Crimp terminal 40 with electric wire>
As shown in Fig. 6, the crimp terminal with electric wire 40 has extrusion protrusions 42 formed by extruding a part of each crimping piece 28 toward the core wire 12 in an intermediate region α excluding both side portions of the core wire crimping portion 18 in the extending direction of the core wire 12 (left and right direction in Fig. 6). In the second embodiment, the extrusion protrusions 42 are arranged in the intermediate region α of the base end sides 44, 44 of the crimping pieces 28, 28 arranged opposite to each other on both sides in the width direction of the core wire crimping portion 18, and further in the central portion of the intermediate region α (see Fig. 6). Note that, in the above-mentioned pressing process, the core wire crimping portion 18 of the crimp terminal 20 is placed on a lower press die (not shown) in a state in which the crimping pieces 28 of the core wire crimping portion 18 are oriented so as to be arranged upward, and an upper press die (having a protrusion for forming the extrusion protrusions 42) (not shown) is placed on top to perform pressing. In conjunction with the formation of the extrusion protrusions 42, recesses 48 that open onto the outer surfaces 46 of the respective crimping pieces 28 are provided.
　図７に示すように、各加締め片２８の基端側４４に設けられた押出突部４２の押出方向（図７中左右方向）での押出突部４２の突出端面５０が突出方向に直交する方向に平面状に広がっており、芯線１２の内部に差し込まれた各加締め片２８の先端部３８に対向配置されている。なお、図示は省略するが、実施形態２においても、底板部２６の内面３０や各加締め片２８の内面５２の適所に実施形態１の如きセレーション３２を設けてもよい。そして、押出突部４２における加締め片２８の内面５２からの突出寸法：Ｌ１は、セレーション３２が設けられる場合には、セレーション３２における底板部２６の内面３０や加締め片２８の内面５２からの深さ寸法：Ｌ２よりも大きくされ、好ましくは、２倍以上、より好ましくは３倍以上とされることが望ましい。セレーションが設けられない場合であっても、一般的なセレーションの深さ寸法よりも押出突部４２の突出寸法：Ｌ１は大きくされることが好ましい。 As shown in FIG. 7, the protruding end surface 50 of the extrusion protrusion 42 provided on the base end side 44 of each crimping piece 28 in the extrusion direction (left and right direction in FIG. 7) spreads flatly in a direction perpendicular to the protruding direction, and is disposed opposite the tip end 38 of each crimping piece 28 inserted inside the core wire 12. Although not shown, in the second embodiment, serrations 32 as in the first embodiment may be provided at appropriate positions on the inner surface 30 of the bottom plate portion 26 and the inner surface 52 of each crimping piece 28. If serrations 32 are provided, the protruding dimension L1 of the extrusion protrusion 42 from the inner surface 52 of the crimping piece 28 is made larger than the depth dimension L2 of the serrations 32 from the inner surface 30 of the bottom plate portion 26 and the inner surface 52 of the crimping piece 28, preferably two or more times, more preferably three or more times. Even if serrations are not provided, it is preferable that the protruding dimension L1 of the extrusion protrusion 42 is larger than the depth dimension of a general serration.
　実施形態２の電線付き圧着端子４０においても、芯線圧着部１８の底板部２６上に載置された芯線１２に対して一対の加締め片２８，２８を加締め圧着する圧着工程の後に、プレス工程において、各加締め片２８の所定の部位を芯線１２に向かって押し出して押出突部４２が形成される。それゆえ、実施形態１と同様に、押出突部４２と加締め片２８の間に挟まれる芯線１２の圧縮率を向上させることができ、押出突部４２による素線間の高密度化による圧着端子２０と芯線１２との安定的な電気接続を一層有利に実現できる。特に、一対の加締め片２８のそれぞれの基端側４４に押出突部４２を設けてそれぞれの先端部３８との間で芯線１２を挟持できることから、芯線１２を構成する素線間の圧縮状態を左右均等に実現することが容易となり、圧縮状態が不均等となる場合に比して車両での熱影響による抵抗の上昇を一層有利に抑えることができる。その他、押出突部４２が中間領域α内にあって、さらにその中央部分に配置されていることによる圧縮力の逃げ抑制効果や、押出突部４２の形成において切り欠きや穴が形成されていないことによる圧縮力の逃げ抑制効果も実施形態１と同様に得ることができる。 In the crimp terminal 40 with electric wire of the second embodiment, after the crimping process in which the pair of crimping pieces 28, 28 are crimped and crimped to the core wire 12 placed on the bottom plate 26 of the core wire crimping portion 18, a predetermined portion of each crimping piece 28 is pushed toward the core wire 12 in the pressing process to form an extrusion protrusion 42. Therefore, as in the first embodiment, the compression ratio of the core wire 12 sandwiched between the extrusion protrusion 42 and the crimping piece 28 can be improved, and a stable electrical connection between the crimp terminal 20 and the core wire 12 can be more advantageously achieved by increasing the density between the strands by the extrusion protrusion 42. In particular, since the extrusion protrusion 42 is provided on the base end side 44 of each of the pair of crimping pieces 28 and the core wire 12 can be sandwiched between the respective tip portions 38, it is easy to achieve an even compression state between the strands constituting the core wire 12 on the left and right, and the increase in resistance due to the thermal effect in the vehicle can be more advantageously suppressed compared to the case where the compression state is uneven. In addition, the extrusion protrusion 42 is located in the middle region α and is positioned in its central portion, which prevents the compression force from escaping. The extrusion protrusion 42 is also formed without a notch or hole, which prevents the compression force from escaping, similar to the first embodiment.
＜変形例＞
　以上、本開示の具体例として、実施形態１，２について詳述したが、本開示はこの具体的な記載によって限定されない。本開示の目的を達成できる範囲での変形、改良等は本開示に含まれるものである。例えば次のような実施形態の変形例も本開示の技術的範囲に含まれる。 <Modification>
Although the first and second embodiments have been described above as specific examples of the present disclosure, the present disclosure is not limited to these specific descriptions. Modifications, improvements, etc., within the scope of achieving the object of the present disclosure, are included in the present disclosure. For example, the following modified examples of the embodiments are also included in the technical scope of the present disclosure.
（１）実施形態１では、底板部２６の１か所に押出突部３４が押出形成されていたが、底板部２６の複数箇所に複数の押出突部３４が設けられていてもよい。実施形態２では、各加締め片２８に１つの押出突部４２が設けられていたが、各加締め片２８に複数の押出突部３４が設けられていてもよいし、一方の加締め片２８にのみ１つまたは複数の押出突部４２が設けられていてもよい。 (1) In the first embodiment, the extrusion protrusion 34 is extruded at one location on the bottom plate portion 26, but multiple extrusion protrusions 34 may be provided at multiple locations on the bottom plate portion 26. In the second embodiment, one extrusion protrusion 42 is provided on each crimping piece 28, but multiple extrusion protrusions 34 may be provided on each crimping piece 28, or one or multiple extrusion protrusions 42 may be provided on only one of the crimping pieces 28.
（２）実施形態１，２では、押出突部３４，４２は、底板部２６または加締め片２８のいずれか一方に設けられていたが、それら両方に設けられていてもよい。 (2) In the first and second embodiments, the extrusion protrusions 34, 42 are provided on either the bottom plate portion 26 or the crimping piece 28, but they may be provided on both.
（３）本実施形態では、セレーション３２は、芯線１２の延出方向に交差する方向に延びる凹溝状であったが、セレーション３２の形状や配設状態はこれに限定されない。例えば、凹状であればよく、凹溝状に延びる必要はなく、ドット状に配置された円形または多角形状の凹部によって構成してもよい。さらに、セレーションの形成部位は、底板部に代えてまたは加えて加締め片の内面に設けられていてもよい。 (3) In this embodiment, the serrations 32 are groove-shaped extending in a direction intersecting the extension direction of the core wire 12, but the shape and arrangement of the serrations 32 are not limited to this. For example, they may be concave, and do not need to extend in a groove-like shape, but may be formed of circular or polygonal recesses arranged in a dot pattern. Furthermore, the serrations may be formed on the inner surface of the crimping piece instead of or in addition to the bottom plate portion.
１０　電線付き圧着端子（実施形態１）
１２　芯線
１４　絶縁被覆
１６　電線
１８　芯線圧着部
２０　圧着端子
２２　接続部
２４　ボルト挿通孔
２６　底板部
２８　加締め片
３０　内面（底板部）
３２　セレーション
３３　外面（底板部）
３４　押出突部
３５　凹み部
３６　突出端面
３８　先端部（加締め片）
４０　電線付き圧着端子（実施形態２）
４２　押出突部
４４　基端側
４６　外面（加締め片）
４８　凹み部
５０　突出端面
５２　内面（加締め片）
α　中間領域
Ｌ１　押出突部の突出寸法
Ｌ２　セレーションの深さ寸法 10 Crimp terminal with electric wire (embodiment 1)
12 Core wire 14 Insulating coating 16 Electric wire 18 Core wire crimping portion 20 Crimp terminal 22 Connection portion 24 Bolt insertion hole 26 Bottom plate portion 28 Crimping piece 30 Inner surface (bottom plate portion)
32 Serration 33 External surface (bottom plate)
34: Extrusion protrusion 35: Recessed portion 36: Protruding end surface 38: Tip portion (crimping piece)
40 Crimp terminal with electric wire (embodiment 2)
42: Extrusion protrusion 44: Base end side 46: Outer surface (crimping piece)
48: recessed portion 50: protruding end surface 52: inner surface (crimping piece)
α Intermediate region L1 Projection dimension of extrusion protrusion L2 Depth dimension of serration

Claims (6)

  1. 　端末において内部の芯線が絶縁被覆から露出してなる電線と、
    　前記電線の前記芯線が圧着された芯線圧着部を有する圧着端子と、を備え、
    　前記圧着端子の前記芯線圧着部は、前記芯線が載置される底板部と、前記底板部の両側から突出して前記底板部上の前記芯線に対して加締め圧着された一対の加締め片と、を有し、
    　前記芯線圧着部は、前記芯線の延出方向の両側部分を除く中間領域において、前記底板部および前記加締め片の少なくとも一方における一部を前記芯線に向かって押し出して形成した押出突部を有している、電線付き圧着端子。     An electric wire having an inner core wire exposed from an insulating coating at a terminal;
    a crimp terminal having a core crimping portion to which the core wire of the electric wire is crimped,
    the core wire crimping portion of the crimp terminal has a bottom plate portion on which the core wire is placed, and a pair of crimping pieces protruding from both sides of the bottom plate portion and crimped to the core wire on the bottom plate portion,
    The core wire crimping portion has an extrusion protrusion formed by extruding a portion of at least one of the bottom plate portion and the crimping piece toward the core wire in an intermediate region excluding both side portions in the extension direction of the core wire.
  2. 　前記押出突部が、前記延出方向における前記中間領域の中央部分に設けられている、請求項１に記載の電線付き圧着端子。 The crimp terminal with electric wire according to claim 1, wherein the extrusion protrusion is provided in the center of the intermediate region in the extension direction.
  3. 　前記押出突部が、前記底板部の前記中間領域に設けられており、前記押出突部の押出方向で前記押出突部の突出端面が前記芯線の内部に差し込まれた前記一対の加締め片の先端部に対向配置されている、請求項１または請求項２に記載の電線付き圧着端子。 The crimp terminal with electric wire according to claim 1 or claim 2, wherein the extrusion protrusion is provided in the intermediate region of the bottom plate portion, and the protruding end face of the extrusion protrusion is arranged to face the tip end of the pair of crimping pieces inserted inside the core wire in the extrusion direction of the extrusion protrusion.
  4. 　前記押出突部が、各前記加締め片の基端側における前記中間領域に設けられており、前記押出突部の押出方向で前記押出突部の突出端面が前記芯線の内部に差し込まれた各前記加締め片の先端部に対向配置されている、請求項１または請求項２に記載の電線付き圧着端子。 The crimp terminal with electric wire according to claim 1 or claim 2, wherein the extrusion protrusion is provided in the intermediate region on the base end side of each of the crimping pieces, and the protruding end face of the extrusion protrusion is arranged to face the tip end of each of the crimping pieces inserted inside the core wire in the extrusion direction of the extrusion protrusion.
  5. 　前記底板部および前記加締め片の内面の少なくとも一方には、凹状のセレーションが設けられており、前記内面からの前記セレーションの深さ寸法よりも、前記底板部または前記加締め片の前記内面からの前記押出突部の突出寸法の方が大きい、請求項１または請求項２に記載の電線付き圧着端子。 The crimp terminal with electric wire according to claim 1 or claim 2, wherein at least one of the bottom plate portion and the inner surface of the crimping piece is provided with a concave serration, and the protrusion dimension of the extrusion protrusion from the bottom plate portion or the inner surface of the crimping piece is greater than the depth dimension of the serration from the inner surface.
  6. 　端末において内部の芯線が絶縁被覆から露出してなる電線と、前記電線の前記芯線が圧着される芯線圧着部を有する圧着端子を準備し、
    　前記芯線圧着部が、前記芯線が載置される底板部と、前記底板部の両側から突出する一対の加締め片を有しており、前記電線の前記芯線を前記底板部に載置して、前記底板部上の前記芯線に対して前記一対の加締め片を加締め圧着し、
    　前記加締め圧着後に、前記芯線の延出方向の両側部分を除く中間領域において、前記底板部および前記加締め片の少なくとも一方における一部を前記芯線に向かって押し出して押出突部を形成する、電線付き圧着端子の製造方法。     A crimp terminal is provided having an electric wire, the inner core of which is exposed from an insulating coating at a terminal thereof, and a core crimping portion to which the core of the electric wire is crimped;
    the core wire crimping portion has a bottom plate portion on which the core wire is placed and a pair of crimping pieces protruding from both sides of the bottom plate portion, the core wire of the electric wire is placed on the bottom plate portion, and the pair of crimping pieces are crimped and crimped to the core wire on the bottom plate portion,
    A method for manufacturing a crimp terminal with electric wire, wherein after the crimping, a portion of at least one of the bottom plate portion and the crimping piece is extruded toward the core wire in an intermediate region excluding both side portions in the extension direction of the core wire to form an extrusion protrusion.
PCT/JP2024/014569 2023-04-12 2024-04-10 Electric wire-equipped crimp terminal and manufacturing method of crimp terminal with electric wire WO2024214747A1 (en)

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JP2023-064900 2023-04-12

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3892459A (en) * 1974-06-21 1975-07-01 Amp Inc Open barrel terminal and method for terminating an electrical wire therein
JPS55120079U (en) * 1979-02-16 1980-08-25
JPH08222343A (en) * 1995-02-17 1996-08-30 Yazaki Corp Terminal crimping apparatus and terminal crimping method
JP2010073348A (en) * 2008-09-16 2010-04-02 Sumitomo Wiring Syst Ltd Terminal metal fitting, and electric wire with terminal metal fitting
JP2010103012A (en) * 2008-10-24 2010-05-06 Yazaki Corp Crimping terminal for aluminum wire and method for manufacturing crimping terminal for aluminum wire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3892459A (en) * 1974-06-21 1975-07-01 Amp Inc Open barrel terminal and method for terminating an electrical wire therein
JPS55120079U (en) * 1979-02-16 1980-08-25
JPH08222343A (en) * 1995-02-17 1996-08-30 Yazaki Corp Terminal crimping apparatus and terminal crimping method
JP2010073348A (en) * 2008-09-16 2010-04-02 Sumitomo Wiring Syst Ltd Terminal metal fitting, and electric wire with terminal metal fitting
JP2010103012A (en) * 2008-10-24 2010-05-06 Yazaki Corp Crimping terminal for aluminum wire and method for manufacturing crimping terminal for aluminum wire

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