JP2010027505A - Terminal metal fastener, and wire having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To block surely the movement of metal element wires in axial directions when a press-adhered portion receives a force applied in front/rear directions, in a terminal metal fastener. <P>SOLUTION: In the terminal metal fastener 10, a crimp 30 which is crimped pressingly to a terminal of a core wire 42 so as to hug the terminal is provided at the rear side of a body 20 connected with a mate-side conductors. The core wire 42 having a covered wire 40 with a cover 43 includes a twisted wire wherein a plurality of the metal element wires 41 are twisted. Furthermore, in a contacting portion which encloses the terminal of the core wire 42 in the press-adhered portion 30, a plurality of serrations 34 which are bitten by the core wire 42 accompanied by the crimp are formed. Moreover, at the opening edge of each serration 34, each hook side 34A which is nearly orthogonal to the axial direction P1 of the metal element wire 41 is formed constitutionally. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

Conventionally, a terminal fitting described in Patent Document 1 below is known as a terminal fitting including a crimping portion that crimps a core wire formed by twisting a plurality of metal strands. The crimp portion is provided with a pair of crimp pieces that embrace the ends of the core wire of the covered electric wire covered with the sheath from both the left and right sides. A pair of hook sides (ridges) that bite into the surface of the core wire protrude from the opposing surfaces of both the crimping pieces. At the time of crimping, these hooked side portions can break through the oxide film on the surface of the core wire and come into contact with the internal conductor to reliably establish conduction.
JP 2003-317817 A

  However, according to the above terminal fitting, as a result of arranging the hooking side portion in the direction orthogonal to the axial direction of the core wire, the hooking side portion is arranged obliquely with respect to the axial direction of the metal strand. . Here, when the covered wire is shaken up and down, etc., and the crimping part receives a force in the front-rear direction, each metal wire receives a pulling force in the axial direction at the same time, but it is hooked as described above. Since the side portion is disposed obliquely with respect to the axial direction of the metal strand, the movement of the metal strand in the axial direction cannot be reliably prevented.

  The present invention has been completed based on the above circumstances, and it is an object of the present invention to reliably prevent the movement of the metal wire in the axial direction when the crimping portion receives a force in the front-rear direction. To do.

  The present invention is crimped so as to embrace the end of a core wire in a covered electric wire covering a core wire made of a twisted wire obtained by twisting a plurality of metal strands behind a connecting portion connected to a counterpart conductor. A terminal fitting provided with a crimping portion, wherein a contact surface that wraps the terminal end of the core wire in the crimping portion is formed with a plurality of recesses into which the core wire bites in along with the crimping, and an opening edge of each recess has a metal It is characterized in that a hooking side portion that is substantially orthogonal to the axial direction of the element wire is formed.

  According to such a configuration, the core wire is embedded in the concave portion along with the pressure bonding, and the embedded portion is engaged with the hooking side portion. Here, since the hooking side portion is arranged substantially orthogonal to the axial direction of the metal strand, when the crimping portion receives a force in the front-rear direction, the movement of the metal strand in the axial direction is surely prevented. Can do.

The following configuration is preferable as an embodiment of the present invention.
The recess may be formed in a groove shape extending in the extending direction of the hooking side portion, and the plurality of recesses may be arranged side by side at a certain interval in the axial direction of the metal strand.
According to such a configuration, the structure of the mold can be simplified because the portion of the mold that strikes the concave portion forming the groove shape may be formed as an elongated protrusion.

A recessed part is good also as a structure currently formed in the hole shape which has a square opening edge part. As the square opening edge, an opening edge such as a square or a parallelogram may be used.
According to such a configuration, in addition to being able to prevent the movement of the metal element wire in the axial direction by the hooking side part, the extending direction of the hooking side part by the adjacent side part adjacent to the hooking side part The movement to can also be prevented.

The plurality of recesses are arranged side by side in the extending direction of the hooking side part, and are arranged in the extending direction of the adjacent side part adjacent to the hooking side part at a constant interval. It is good also as the structure arranged.
According to such a configuration, the protrusions that knock out the recesses in the mold are arranged in a row, and therefore, by forming between the protrusions by cutting without accompanying a time-consuming processing method such as electric discharge machining. The mold can be easily manufactured.

Further, the present invention provides an electric wire with a terminal fitting in which any one of the above terminal fittings is crimped to the end of the core wire in a covered electric wire in which a core wire made of a twisted wire obtained by twisting a plurality of metal strands is covered with a coating. Also good.
In this case, the metal strand may be made of aluminum or an aluminum alloy.

  ADVANTAGE OF THE INVENTION According to this invention, when a crimping | compression-bonding part receives the force to the front-back direction, the movement to the axial direction of a metal strand can be prevented reliably.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to the drawings of FIGS. As shown in FIG. 1, the terminal fitting 10 in the present embodiment includes a main body portion 20 (an example of the “connecting portion” in the present invention) 20 having a rectangular tube shape, and a crimping portion 30 formed at the rear of the main body portion 20. It has. The crimping part 30 is crimped so as to be held in the terminal of the covered electric wire 40.

  The covered electric wire 40 is an aluminum electric wire and has a configuration in which a core wire 42 made of a stranded wire obtained by twisting a plurality of metal strands 41 is covered with a covering 43. The covered electric wire 40 of the present embodiment uses a cross-sectional area of 0.75 sq and 11 metal wires 41. The conductor outer diameter (standard) of the core wire 42 is 1 mm. Further, the twist angle of the metal wire 41 is set to about 5 ° with respect to the axial direction of the core wire 42. The metal wire 41 is made of aluminum or an aluminum alloy.

  An elastic contact piece 21 that can be elastically displaced is formed inside the main body portion 20 by folding back from the front edge of the bottom surface portion 22 of the main body portion 20. A mating conductor (not shown) having a tab shape can be inserted between the opposing surface (not shown) facing the elastic contact piece 21 and the elastic contact piece 21 inside the main body 20. .

  The distance between the elastic contact piece 21 in the natural state and the opposing surface is set to be smaller than the plate thickness of the counterpart conductor. For this reason, when the counterpart conductor is inserted between the opposing surfaces while bending the elastic contact piece 21, the counterpart conductor and the elastic contact piece 21 are elastically contacted and electrically connected.

  The crimping portion 30 includes a wire barrel portion 31 having a substantially U shape and an insulation barrel portion 32 having a substantially U shape disposed behind the wire barrel portion 31. The wire barrel portion 31 and the insulation barrel portion 32 have a base surface 33 that is continuous with the bottom surface portion 22 of the main body portion 20, and each include a pair of caulking pieces 31 </ b> A and 32 </ b> A that stand up from opposite side edges of the base surface 33. Configured.

  As shown in FIG. 2, the wire barrel portion 31 can fix the core wire 42 by caulking the core wire 42 of the covered electric wire 40 with both caulking pieces 31 </ b> A. Similarly, the insulation barrel portion 32 can fix the covering 43 by caulking the covering 43 of the covered electric wire 40 with both the caulking pieces 32A.

  As shown in FIG. 3, a plurality of serrations (an example of the “concave part” of the present invention) 34 into which the core wire 42 bites is formed on the contact surface that wraps the end of the core wire 42 in the wire barrel portion 31. . As shown in FIG. 4, the serration 34 has a groove shape extending in a direction orthogonal to the axial direction P <b> 1 of the metal strand 41. Further, the serrations 34 are arranged side by side with a constant interval L1 in the axial direction P1 of the metal strand 41.

  A pair of hooking side portions 34 </ b> A extending in a direction orthogonal to the axial direction P <b> 1 of the metal element wire 41 is provided at the opening edge portion of each serration 34. 4 indicates the angle of the extending direction P3 of the hook side 34A with respect to the axial direction P1 of the metal wire 41, and the angle θ in the present embodiment is 90 °.

  When the core wire 42 is crimped by the wire barrel portion 31, the core wire 42 is almost completely embedded in the serration 34, and the embedded portion is in the axial direction P1 of the metal strand 41 with respect to the hooking side portion 34A. By locking, the movement of the metal wire 41 in the axial direction P1 is surely prevented, and thus the movement of the core wire 42 of the covered electric wire 40 in the axial direction P2 is reliably prevented.

  Next, the structure of the mold for knocking out the serration 34 will be briefly described. Since the portion where the serration 34 is formed in the mold can be constituted by a plurality of elongated protrusions, the structure of the mold is It can be simplified. In the case of forming such long and narrow protrusions, a space between the protrusions can be formed by cutting, so that the mold can be easily manufactured.

  The present embodiment is configured as described above, and its operation will be described subsequently. First, the covering 43 is peeled off at the end of the covered electric wire 40 to expose the core wire 42. Next, the core wire 42 is disposed on the contact surface of the wire barrel portion 31, and the covering 43 is disposed on the contact surface of the insulation barrel portion 32. Then, by caulking the caulking piece 31A of the wire barrel part 31 and the caulking piece 32A of the insulation barrel part 32, the core wire 42 is fixed to the wire barrel part 31, and the covering 43 is fixed to the insulation barrel part 32, and the terminal The electric wire with bracket is completed.

  The electric wire with terminal fittings manufactured in this way is shipped for the next process. Here, for example, a force in the front-rear direction may be applied to the crimping part 30 by, for example, the covered electric wire 40 being shaken up and down during conveyance. At this time, the core wire 42 receives a force in the axial direction P2, but at the same time, each metal wire 41 receives a force in the axial direction P1. However, the core wire 42 is embedded in the serration 34, and the embedded portion is locked to the hooking side portion 34A, thereby restricting the movement of each metal strand 41 in the axial direction P1, Therefore, the movement of the core wire 42 in the axial direction P2 is restricted.

  As described above, in the present embodiment, the hooking side portion 34A of the serration 34 in the crimping portion 30 is arranged to be orthogonal to the axial direction P1 of each metal element wire 41. When a force is applied, the covered electric wire 40 can be reliably prevented from moving in the axial direction P2 of the core wire 42. Further, since the serrations 34 having a groove shape are arranged side by side with a constant interval L1 in the axial direction P1 of the metal element wire 41, the structure of the mold can be simplified.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to the drawings of FIGS. In the present embodiment, the structure of the serration 34 according to the first embodiment is partly changed, and description of other overlapping structures, operations, and effects is omitted.

  As shown in FIG. 5, the serration 35 of the present embodiment is formed in a hole shape having a square opening edge. As in the first embodiment, the hooking side portion 35A of the serration 35 is arranged to be orthogonal to the axial direction P1 of the metal strand 41 as shown in FIG. That is, the angle θ in the extending direction P3 of the hook side 35A with respect to the axial direction P1 of the metal strand 41 is 90 °. An adjacent side portion 35B adjacent to the hooking side portion 35A at the opening edge portion of the serration 35 is configured to extend in the axial direction P1 of the metal strand 41. For this reason, in addition to being able to prevent movement of the metal element wire 41 in the axial direction P1 by the hooking side portion 35A, it is also possible to prevent movement of the hooking side portion 35A in the extending direction P3 by the adjacent side portion 35B. can do.

  A plurality of serrations 35 are arranged on the contact surface that wraps the end of the core wire 42 in the wire barrel portion 31. The plurality of serrations 35 are arranged side by side in the extending direction P3 of the hooking side portion 35A with a certain interval S2, and the extending direction (metal element) of the adjacent side portion 35B adjacent to the hooking side portion 35A. They are arranged side by side with a constant interval L2 in the axial direction P1) of the line 41. For this reason, as shown in FIG. 7, the protrusions 51 that knock out the serrations 35 in the mold 50 are arranged side by side with a constant interval L2 in the axial direction P1 of the metal strand 41 and hooked. The side portions 35A are arranged side by side in the extending direction P3 with a predetermined interval S2. Therefore, since each protrusion 51 is also arranged in a line in the axial direction P1 of the metal element wire 41 and the extending direction P3 of the hook side 35A, each protrusion 51 can be formed by cutting. it can. Therefore, the metal mold | die 50 can be easily manufactured by forming between each protrusion 51 by cutting without accompanying the time-consuming machining method, such as electric discharge machining.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to the drawings of FIGS. In the present embodiment, the shape of the opening edge portion of the serration 35 of the second embodiment is changed, and description of other overlapping structures, functions, and effects is omitted.

  As shown in FIG. 8, the serration 36 of the present embodiment is formed in a hole shape having an opening edge of a parallelogram. As in the second embodiment, the hooking side portion 36A of the serration 36 is arranged to be orthogonal to the axial direction P1 of the metal strand 41 as shown in FIG. That is, the angle θ in the extending direction P3 of the hook side portion 36A with respect to the axial direction P1 of the metal strand 41 is 90 °. An adjacent side portion 36B adjacent to the hooking side portion 36A at the opening edge portion of the serration 36 is configured to extend in the axial direction P1 of the metal strand 41. For this reason, in addition to being able to prevent movement of the metal element wire 41 in the axial direction P1 by the hooking side portion 36A, the adjacent side portion 36B also prevents movement of the hooking side portion 36A in the extending direction P3. can do.

  In addition, as shown in FIG. 10, the protrusion 61 that knocks out the serration 36 in the mold 60 is arranged side by side with a constant interval L3 in the axial direction P1 of the metal strand 41, and the hook side The portions 36A are arranged side by side with a constant interval S3 in the extending direction P3. Therefore, since each protrusion 61 is also arranged in a line in the axial direction P1 of the metal element wire 41 and the extending direction P3 of the hook side 36A, each protrusion 61 can be formed by cutting. it can. Therefore, the metal mold | die 60 can be easily manufactured by forming between each protrusion 61 by a cutting process, without accompanying the time-consuming process method, such as an electrical discharge machining.

  Furthermore, in the present embodiment, the plurality of serrations 36 arranged in a line in the extending direction of the hooking side portion 36A are extended in the extending direction of the hooking side portion 36A as they move one step in the axial direction P1 of the metal wire 41. Since they are arranged so as to be overlapped with P3, the metal strand 41 can be hooked at all positions in the extending direction P3 of the hooking side 36A. On the other hand, in the case of the arrangement of the second embodiment, a line in which the metal wire 41 is not caught is generated, and the serrations 35 cannot be arranged evenly in the extending direction P3 of the hooking side part 35A. Therefore, in this embodiment, the metal wire 41 can be more easily caught than in the second embodiment while simplifying the manufacture of the mold 60.

<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, each serration is arranged in the axial direction P1 of the metal element wire 41 at a predetermined interval. However, according to the present invention, each serration is arranged in the axial direction P1 of the metal element wire 41. You may arrange | position with a different space | interval.

  (2) In this embodiment, a pair of hooking sides are provided at the opening edge of one serration. However, according to the present invention, only one hooking side is provided at the opening edge of one serration. Also good.

  (3) Although the present embodiment provides serrations having groove-like or square opening edges, serrations having triangular opening edges may be provided according to the present invention.

  (4) Although in the second and third embodiments, the serrations are arranged side by side in the extending direction P3 of the hook side with a certain interval, according to the present invention, each serration is You may arrange | position with a different space | interval in the extending direction P3.

(5) In the present embodiment, the size of the covered electric wire 40 is 0.75 sq (compressed conductor and the number of metal strands 41 is 11), the conductor outer diameter (standard) is 1 mm, and the twist angle is 8.93 °. Although aluminum wires are used, according to the present invention, the following aluminum wires may be used.
Aluminum electric wire 1 Size: 1.25 sq (compressed conductor has 16 metal wires 41), conductor outer diameter (standard): 1.4 mm, twist angle: 12.40 °
Aluminum wire 2 Size: 2 sq (19 metal strands 41, not compression conductors), conductor outer diameter (standard): 1.8 mm, twist angle: 13.26 °
Aluminum wire 3 Size: 2.5 sq (19 metal strands 41 instead of compression conductors), conductor outer diameter (standard): 2.1 mm, twist angle: 15.37 °
Aluminum wire 4 Size: 3 sq (37 metal strands 41, not compression conductors), conductor outer diameter (standard): 2.25 mm, twist angle: 16.41 °

The perspective view of the terminal metal fitting in Embodiment 1. Side view of terminal fitting in Fig. 1 The top view in the unfolded state of the crimping | compression-bonding part in Embodiment 1. The top view which showed the state by which the hook side part and metal strand in FIG. 3 were arrange | positioned orthogonally The top view in the unfolded state of the crimping part in Embodiment 2. The top view which showed the state by which the hook side part in FIG. 5 and the metal strand were arrange | positioned orthogonally The perspective view which showed the protrusion of the metal mold | die which knocks out the serration in Embodiment 2 The top view in the unfolded state of the crimping part in Embodiment 3 The top view which showed the state by which the hook side part in FIG. 8 and the metal strand were arrange | positioned orthogonally The perspective view which showed the protrusion of the metal mold | die which knocks out the serration in Embodiment 3

Explanation of symbols

10 ... Terminal fitting 20 ... Main body (connection part)
30 ... Crimp part 31 ... Insulation barrel part 34 ... Serration (concave part)
34A ... Hook side 35 ... Serration (recess)
35A ... Hook side 35B ... Adjacent side 36 ... Serration 36A ... Hook side 36B ... Adjacent side 40 ... Covered wire 41 ... Metal wire 42 ... Core wire 43 ... Cover P1 ... Axial direction of metal wire P2 ... Axial direction of core wire P3 ... Extension direction of hook side

Claims (6)

A crimping part that is crimped so as to be held at the end of the core wire in a covered electric wire covered with a core wire composed of a stranded wire formed by twisting a plurality of metal strands behind the connection portion connected to the counterpart conductor A terminal fitting provided with
The contact surface that wraps the end of the core wire in the crimp portion is formed with a plurality of recesses into which the core wire bites with crimping, and the opening edge of each recess is substantially orthogonal to the axial direction of the metal strand. A terminal fitting having a hook side to be formed. The concave portion is formed in a groove shape extending in the extending direction of the hooking side portion, and the plurality of concave portions are arranged side by side at a predetermined interval in the axial direction of the metal strand. The terminal fitting according to claim 1. The terminal fitting according to claim 1, wherein the recess is formed in a hole shape having a square opening edge. The plurality of concave portions are arranged side by side in the extending direction of the hooking side portion with a constant interval, and have a constant interval in the extending direction of an adjacent side portion adjacent to the hooking side portion. The terminal fitting according to claim 3, wherein the terminal fitting is arranged side by side. The terminal metal fitting according to any one of claims 1 to 4 is crimped to an end of the core wire in a covered electric wire in which a core wire made of a twisted wire obtained by twisting a plurality of metal strands is covered with a coating. Electric wire with terminal fittings. The said metal element wire consists of aluminum or aluminum alloy, The electric wire with a terminal metal fitting of Claim 5 characterized by the above-mentioned.

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