JP2009123621A - Crimping terminal for aluminum wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crimping terminal for an aluminum wire that easily and reliably strikes a balance between the reduction in contact resistance of an aluminum wire conductor with the terminal and the securement of the crimping strength of the terminal. <P>SOLUTION: The crimping terminal 10 for the aluminum wire, crimped on the aluminum wire 1 having the conductor 2 in which a plurality of strands 3 made of aluminum or aluminum alloy are twisted, includes: a bottom plate 20 on which the conductor 2 is placed; a pair of conductor swaging pieces 21 that is adjacently provided on the bottom plate 20 and is swaged to the conductor 21 so as to sandwich the conductor 2 on the bottom plate 20; and an elastic piece 24 for pushing the conductor 2, which is placed on the inside of a conductor receiving portion 13 formed with the bottom plate 20 and the pair of conductor swaging pieces 21. A sharp edge 24a is disposed at a position in contact with the conductor 2 of the elastic piece 24. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a crimp terminal for an aluminum wire that is crimped to an aluminum wire having a conductor portion in which a plurality of strands made of aluminum or aluminum alloy are twisted together.

  Copper wires are generally used for wire harnesses routed in vehicles such as automobiles. In connecting the wire harnesses or between the wire harness and the in-vehicle device, a terminal is attached to the copper wire of the wire harness, and this type of terminal is generally attached to the copper wire by crimping.

  The terminals crimped to the copper electric wire typically have a bottom plate portion on which a conductor portion of the copper electric wire formed by twisting a plurality of copper wires is placed, and a conductor portion placed on the bottom plate portion. A pair of conductor caulking pieces that are connected to the bottom plate portion so as to be sandwiched in the width direction. Then, the conductor crimping pieces are crimped to the conductor portion so that their tip portions are inserted into the conductor portion and the strands of the conductor portion are partially held. Thereby, a terminal is crimped | bonded to the conductor part of a copper electric wire.

  By the way, in recent years, aluminum wires have been attracting attention in consideration of the shortage of copper resources and the weight reduction of vehicles and the ease of recycling. However, aluminum has a thicker oxide film formed on the surface than copper, and in an aluminum electric wire, the contact resistance between the conductor portion and the terminal tends to be relatively high. In order to reduce this contact resistance, a method is known in which each conductor crimping piece of the terminal is strongly crimped to the conductor portion to increase the compressibility of the conductor portion. According to this, the oxide film of each strand which comprises a conductor part is destroyed, and the contact resistance between a conductor part and a terminal is reduced. In the present specification, the compression ratio of the conductor portion is defined as the ratio of the cross-sectional area of the conductor portion after crimping to the cross-sectional area of the conductor portion before crimping.

  However, as the compressibility of the conductor portion is increased, the stress acting on the conductor portion is also increased. And aluminum is inferior in mechanical strength compared with copper, and in an aluminum electric wire, when an excessive stress acts on a conductor part, the crimping | compression-bonding strength of a terminal will fall remarkably. Therefore, in crimping terminals to aluminum wires, crimping terminals for aluminum wires or terminals to aluminum wires with the aim of reducing both the contact resistance between the conductor and the terminals and ensuring the crimping strength of the terminals. Various crimping structures have been proposed (see, for example, Patent Documents 1 to 3).

In the crimping structure of the terminal to the aluminum wire disclosed in Patent Document 1, according to the cross-sectional area of the conductor portion of the aluminum wire, the contact resistance between the conductor portion and the terminal is reduced, and the crimping strength of the terminal is ensured. The compression ratio of the conductor portion that can be compatible is defined. For example, when the cross-sectional area of the conductor portion is less than 1.5 mm ² , the compressibility of the conductor portion is 50 to 70%, and when the cross-sectional area of the conductor portion is 1.5 mm ² or more, The compression rate is 40 to 70%. In addition, the crimping | compression-bonding rate of the conductor part in the crimping | compression-bonding of the terminal to a copper electric wire is typically 75 to 95%.

  In the crimping structure of the terminal to the aluminum wire disclosed in Patent Document 2, two pairs of crimping pieces (barrels) to be crimped to the conductor portion 402 of the aluminum wire 401 are provided as shown in FIG. A step is provided so that the holding crimping piece 403 positioned on the proximal end side of the conductor portion is higher than the conductive crimping piece 404 positioned on the distal end side of the conductor portion 402 in the crimped state. Both crimping pieces 403 and 404 are crimped to the conductor portion 402 by using the crimping jig. As a result, the compression rate of the conductor portion 402 by the holding crimping piece 403 is approximately the same as the compression rate of the conductor portion in crimping the terminal to the copper electric wire, and the crimping strength is ensured. The compression ratio is relatively high to reduce the contact resistance.

The crimp terminal for an aluminum electric wire disclosed in Patent Document 3 is provided with serrations on the contact surface between the bottom plate portion and the conductor portion of the crimping piece. Each strand constituting the conductor of the aluminum electric wire bites into the groove constituting the serration, whereby the oxide film on the surface of each strand is removed and the conductor portion is prevented from coming off. And in patent document 3, the depth of the groove | channel which comprises a serration is prescribed | regulated according to the diameter of the strand which comprises the conductor of an aluminum electric wire.
JP 2005-174896 A JP-A-2005-50736 JP 2007-173215 A

  In the crimping structure of the terminal to the aluminum electric wire disclosed in Patent Document 1, the compression ratio of the conductor portion is generally higher than that of the copper electric wire, and the crimping strength of the terminal is inevitably lowered. On the other hand, in the crimping structure of the terminal to the aluminum electric wire disclosed in Patent Document 2, the holding caulking piece is caulked and the conduction caulking piece is caulked. The compression ratio of the conductor can be changed, and the compression ratio of the conductor in the portion where the holding crimping piece is crimped can be set to the same level as in the case of the copper wire, so that a decrease in the crimping strength of the terminal can be avoided. . However, in the crimping structure disclosed in Patent Document 2, a dedicated crimping is used to crimp both the crimping pieces to the conductor so that the conduction crimping pieces and the holding crimping pieces have different heights. A jig is required, and it is necessary to manage the heights of the conductive crimping piece and the holding crimping piece, which is expensive.

  Further, generally, a springback can occur in the crimped piece crimped to the conductor portion. In the crimping structure of the terminal to the aluminum electric wire disclosed in Patent Documents 1 to 3, the tip end portion of the crimping piece is inserted into the conductor portion so that the projecting end surface faces the bottom plate portion. The crimped piece thus crimped easily has its tip portion easily removed from the conductor portion, and springback is likely to occur. And the conductor part of an aluminum electric wire is easy to produce stress relaxation compared with copper in the aluminum which forms each strand, and it is hard to restore | restore even if a springback arises in a crimping piece and stress is reduced. Accordingly, a gap is generated between the crimping piece and the conductor portion, and there is a possibility that desired contact resistance and pressure bonding strength cannot be obtained.

  The present invention has been made in view of the above-described circumstances, and can easily and reliably achieve both a reduction in contact resistance between a conductor portion of an aluminum electric wire and a terminal, and securing of a crimping strength of the terminal. It aims at providing the crimp terminal for aluminum electric wires.

The said objective is achieved by the crimp terminal for aluminum electric wires as described in the following (1)-(4).
(1) A crimp terminal for an aluminum electric wire that is crimped to an aluminum electric wire having a conductor portion in which a plurality of strands made of aluminum or aluminum alloy are twisted together, and a bottom plate portion on which the conductor portion is placed; A pair of conductor crimping pieces that are connected to the bottom plate portion and are crimped to the conductor portion so as to sandwich the conductor portion on the bottom plate portion, and the bottom plate portion and the pair of conductor crimping pieces. An aluminum electric wire comprising: an elastic piece provided on an inner side of a conductor holding part for pressing the conductor part, wherein an edge is provided at a contact portion of the elastic piece with the conductor part Crimp terminal.
(2) The elastic piece is a section connected to the bottom plate portion, and is folded and overlapped with the bottom plate portion with a gap between the elastic piece and the bottom plate portion. Crimp terminal for aluminum wires.
(3) The aluminum wire according to (1), wherein the elastic piece is separated from the bottom plate portion by a pair of slits formed in parallel to the bottom plate portion, and is punched out from the bottom plate portion. Crimp terminal.
(4) The aluminum wire crimp terminal according to (1), wherein the elastic piece is cut and raised from each of the conductor crimping pieces.

According to the crimp terminal for aluminum electric wires having the configuration (1), the oxide film on the surface of each strand of the conductor portion can be removed by the sharp edge provided on the elastic piece. As a result, the contact resistance between the conductor part and the terminal can be reduced without increasing the compression ratio of the conductor part, and the crimping strength of the terminal can be ensured by setting the compression ratio of the conductor part to the same level as in the case of a copper wire. it can. Furthermore, even when a springback occurs in the conductor crimping piece, the gap between the conductor crimping piece and the conductor portion can be filled by restoring the elastic piece. Thereby, the contact resistance between the conductor portion and the terminal and the crimping strength of the terminal can be maintained.
Preferably, the elastic piece is formed by folding a section continuous with the bottom plate portion and overlapping the bottom plate portion with a gap between the elastic piece.
Preferably, the elastic piece is formed by being separated from the bottom plate portion by a pair of slits formed in parallel with the bottom plate portion and punched out from the bottom plate portion.
Preferably, the elastic piece is cut and raised from each conductor crimping piece.

  According to the crimp terminal for an aluminum wire according to the present invention, it is possible to easily and reliably achieve both a reduction in contact resistance between the conductor portion of the aluminum cable and the terminal and a securing of the crimp strength of the terminal.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a connection structure between an aluminum electric wire and a terminal according to the present invention will be described in detail based on the drawings.

(First embodiment)
1 is a perspective view of a first embodiment of a crimp terminal for an aluminum wire according to the present invention, FIG. 2 is a development view of the terminal of FIG. 1, and FIG. 3 is a sectional view of the terminal of FIG.

  As shown in FIG. 1, an aluminum electric wire 1 has a conductor portion 2 in which a plurality of strands 3 made of aluminum or aluminum alloy are twisted together, and a sheath 4 in which the outer periphery of the conductor portion 2 is formed of an insulating material. It is covered. In the end portion of the aluminum electric wire 1, the sheath 4 is removed at a predetermined length to expose the conductor portion 2, and the terminal 10 is crimped to the end portion. A preferred specific example of the aluminum alloy is an alloy of aluminum and iron. When this alloy is employed, it is easier to extend and the strength (particularly the tensile strength) can be increased compared to an aluminum conductor.

  The terminal 10 is provided with a connecting portion 11 with a mating terminal (not shown) at the distal end thereof, and with a holding portion 12 that holds the aluminum electric wire 1 at the proximal end thereof. Furthermore, the holding part 12 is provided with a conductor holding part 13 for holding the conductor part 2 of the aluminum electric wire 1 on the distal end side, and a sheath holding part 14 for holding the sheath 4 of the aluminum electric wire 1 on the base end side. Yes.

  The conductor holding part 13 is connected to the bottom plate part 20 so as to sandwich the bottom plate part 20 on which the conductor part 2 exposed at the terminal part of the aluminum electric wire 1 is placed and the conductor part 2 placed on the bottom plate part 20. And a pair of conductor crimping pieces 21, which are formed in a substantially U shape in a cross section perpendicular to the axial direction of the conductor portion 2 placed on the bottom plate portion 20.

  The sheath holding portion 14 includes a bottom plate portion 22 on which the sheath 4 of the terminal portion of the aluminum electric wire 1 is placed and a pair of sheaths that are connected to the bottom plate portion 22 so as to sandwich the sheath 4 placed on the bottom plate portion 22. And a caulking piece 23, which is formed in a substantially U-shaped cross section like the conductor holding portion 13.

  As shown in FIG. 2, the terminal 10 is formed by punching a single plate made of a conductive material such as a copper alloy into a predetermined shape and bending it. Therefore, the plate material forming the connection portion 11, the bottom plate portion 20 of the conductor holding portion 13, and the bottom plate portion 22 of the sheath holding portion 14 are integrated.

  The terminal 10 further includes an elastic piece 24 inside the conductor holding portion 13. The elastic piece 24 is formed by folding back a section cut out from the plate material of the connection portion 11 connected to the bottom plate portion 20 of the conductor holding portion 13. Thus, the edge 24a of the elastic piece 24 formed by cutting out from the plate material is sharp. The elastic piece 24 is provided so as to overlap the bottom plate part 20 with a predetermined gap between the elastic piece 24 and the bottom plate part 20 of the conductor holding part 13, and when pressed toward the bottom plate part 20, It is elastically bent and deformed so as to narrow the gap with the bottom plate portion 20.

  In the terminal 10, the pair of conductor crimping pieces 21 of the conductor holding part 13 are crimped to the conductor part 2 of the aluminum electric wire 1 placed on the bottom plate part 20 of the conductor holding part 13, and the sheath holding part 14 The pair of sheath crimping pieces 23 is crimped to the sheath 4 of the aluminum electric wire 1 placed on the bottom plate portion 22 of the sheath holding portion 14 and is crimped to the electric wire 1.

  As shown in FIG. 3, the pair of conductor crimping pieces 21 are crimped to the conductor portion 2 substantially symmetrically with respect to a plane that includes the axis of the conductor portion 2 and is substantially perpendicular to the bottom plate portion 20. More specifically, the pair of conductor crimping pieces 21 are bent so that their tip portions are respectively inserted into the conductor portions 2, thereby holding a part of the wires 3 of the conductor portions 2. It is crimped to the conductor part 2 so that it may become. The compression ratio of the conductor part 2 in which the pair of conductor crimping pieces 21 is crimped is 50 to 90%. The form of crimping of the pair of sheath crimping pieces 23 is not particularly limited. For example, the distal end portion of each sheath crimping piece 23 may be bitten into the sheath 4, or only the outer periphery of the sheath 4 may be wound.

  The conductor portion 2 contacts the sharp edge 24a of the elastic piece 24 in the process in which the pair of conductor crimping pieces 21 are crimped and compressed. Each strand 3 of the conductor portion 2 in contact with the edge 24a is scraped off of the oxide film on the surface thereof to expose the aluminum or aluminum alloy substrate. Thereby, good conduction is ensured between the conductor portion 2 and the terminal 10.

  Then, the conductor portion 2 compressed by the crimping of the pair of conductor crimping pieces 21 presses the elastic piece 24 toward the bottom plate portion 20. Accordingly, the elastic piece 24 is elastically bent and deformed so as to narrow a gap with the bottom plate portion 20, and an elastic reaction force is applied to the conductor portion 2.

  According to the aluminum wire crimp terminal 10 of the present embodiment, the oxide film on the surface of each wire 3 of the conductor portion 2 can be removed by the sharp edge 24 a provided on the elastic piece 24. Thereby, even if it does not raise the compression rate of the conductor part 2, the contact resistance of the conductor part 2 and the terminal 10 can be reduced, the compression rate of the conductor part 2 is made the same as the case of a copper wire, and the crimping | compression-bonding strength of the terminal 10 Can be secured. Further, even when a springback occurs in the conductor crimping piece 21, the gap between the conductor crimping piece 21 and the conductor portion 2 can be filled by restoring the elastic piece 24. Thereby, the contact resistance between the conductor part 2 and the terminal 10 and the crimping strength of the terminal 10 can be maintained.

(Second Embodiment)
FIG. 4 is a perspective view of a second embodiment of the crimp terminal for an aluminum electric wire according to the present invention, and FIG. 5 is a development view of the terminal of FIG. In addition, description is abbreviate | omitted or simplified by attaching | subjecting an equivalent code | symbol in a figure to the site | part which is functionally common with the crimp terminal for aluminum electric wires of 1st Embodiment mentioned above.

  As shown in FIG. 4, the connection part 111, the conductor holding part 113, and the sheath holding part 114 are provided on the terminal 110 that is crimped to the terminal part of the aluminum electric wire 1.

  As shown in FIG. 5, the terminal 110 is formed by punching a single plate made of a conductive material such as a copper alloy into a predetermined shape and bending it. Therefore, the plate material forming the connecting portion 111, the bottom plate portion 120 of the conductor holding portion 113, and the bottom plate portion 122 of the sheath holding portion 114 are integrated. In the punching process, a band-like carrier 115 that connects the plurality of terminals 110 is formed. Each terminal 110 is sequentially supplied to the bending press in a state where the base end of the bottom plate portion 122 of the sheath holding portion 114 is connected to the carrier 115. The terminal 110 is separated from the carrier 115 after being bent, and the carrier 115 is generally discarded.

  The terminal 110 further includes an elastic piece 124 inside the conductor holding portion 113. The elastic piece 124 is formed by folding back a section cut out from the plate material of the carrier 115. Thus, the edge 124a of the elastic piece 124 formed by cutting out from the plate material is sharp. The elastic piece 124 is provided along the bottom plate portion 120 across the sheath holding portion 114 with a predetermined gap between the conductor holding portion 113 and the bottom plate portion 120. When pressed, it is elastically bent and deformed so as to narrow the gap with the bottom plate portion 120.

  In the terminal 110, the pair of conductor crimping pieces 121 of the conductor holding part 113 are crimped to the conductor part 2 of the aluminum electric wire 1 placed on the bottom plate part 120 of the conductor holding part 113, and the sheath holding part 114 The pair of sheath crimping pieces 123 is crimped to the sheath 4 of the aluminum electric wire 1 placed on the bottom plate portion 122 of the sheath holding portion 114 and is crimped to the electric wire 1.

  The conductor portion 2 contacts the sharp edge 124a of the elastic piece 124 in the process in which the pair of conductor crimping pieces 121 are crimped and compressed. Each strand 3 of the conductor portion 2 in contact with the edge 124a is stripped off of the oxide film on the surface thereof to expose the aluminum or aluminum alloy substrate. Thereby, good conduction is ensured between the conductor portion 2 and the terminal 110.

  Then, the conductor portion 2 compressed by the crimping of the pair of conductor crimping pieces 121 presses the elastic piece 124 toward the bottom plate portion 120. Thereby, the elastic piece 124 is elastically bent and deformed so as to narrow the gap with the bottom plate portion 120, and an elastic reaction force is applied to the conductor portion 2.

  According to the aluminum wire crimp terminal 110 of the present embodiment, the oxide film on the surface of each wire 3 of the conductor portion 2 can be removed by the sharp edge 124 a provided on the elastic piece 124. Thereby, the contact resistance between the conductor part 2 and the terminal 110 can be reduced without increasing the compression ratio of the conductor part 2, and the compression strength of the terminal 110 is set to the same compression ratio as that of the copper wire. Can be secured. Furthermore, even when a springback occurs in the conductor crimping piece 121, the gap between the conductor crimping piece 121 and the conductor portion 2 can be filled by restoring the elastic piece 124. Thereby, the contact resistance between the conductor part 2 and the terminal 110 and the crimping strength of the terminal 110 can be maintained.

  Furthermore, according to the crimp terminal 110 for aluminum electric wires of this embodiment, the elastic piece 124 is cut out from the carrier 115 that is generally discarded. Therefore, the use efficiency of the plate material forming the terminal 110 can be increased.

(Third embodiment)
6 is a perspective view of a third embodiment of the crimp terminal for an aluminum electric wire according to the present invention, FIG. 7 is a development view of the terminal of FIG. 6, and FIG. 8 is a sectional view of the terminal of FIG. In addition, description is abbreviate | omitted or simplified by attaching | subjecting an equivalent code | symbol in a figure to the site | part which is functionally common with the crimp terminal for aluminum electric wires of 1st Embodiment mentioned above.

  As shown in FIG. 6, the connection part 211, the conductor holding part 213, and the sheath holding part 214 are provided on the terminal 210 that is crimped to the terminal part of the aluminum electric wire 1.

  The terminal 210 further includes an elastic piece 224 inside the conductor holding portion 213. As shown in FIG. 7, the elastic piece 224 is formed with a pair of slits 225 extending in parallel with the axial direction of the conductor part 2 placed on the bottom plate part 220 of the conductor holding part 213 in the bottom plate part 220. A region between the pair of slits 225 is divided from the bottom plate part 220, and the divided region is formed by punching out from the bottom plate part 220. Therefore, the elastic piece 224 is supported by the bottom plate part 220 at both ends. Further, the edge 224a of the elastic piece 224 formed by cutting out from the plate material in this way is sharp.

  In the terminal 210, the pair of conductor crimping pieces 221 of the conductor holding part 213 is crimped to the conductor part 2 of the aluminum electric wire 1 placed on the bottom plate part 220 of the conductor holding part 213, and the sheath holding part 214 The pair of sheath crimping pieces 223 is crimped to the sheath 4 of the aluminum electric wire 1 placed on the bottom plate portion 222 of the sheath holding portion 214 and is crimped to the electric wire 1.

  As shown in FIG. 8, the conductor portion 2 contacts the sharp edge 224 a of the elastic piece 224 in the process in which the pair of conductor crimping pieces 221 are crimped and compressed. Each strand 3 of the conductor portion 2 in contact with the edge 224a is scraped off of the oxide film on the surface thereof to expose the aluminum or aluminum alloy substrate. Thereby, good conduction is ensured between the conductor portion 2 and the terminal 210.

  And the conductor part 2 which the pair of conductor crimping pieces 221 was crimped and compressed presses the elastic piece 224 toward the bottom plate part 220 side. Thereby, the elastic piece 224 is elastically bent and deformed toward the bottom plate part 220 side, and an elastic reaction force is applied to the conductor part 2.

  According to the aluminum wire crimp terminal 210 of the present embodiment, the oxide film on the surface of each wire 3 of the conductor portion 2 can be removed by the sharp edge 224 a provided on the elastic piece 224. Thereby, the contact resistance between the conductor part 2 and the terminal 210 can be reduced without increasing the compression rate of the conductor part 2, and the compression strength of the terminal 210 is made the same as the case of the copper wire with the compression rate of the conductor part 2. Can be secured. Furthermore, even when a springback occurs in the conductor crimping piece 221, the gap between the conductor crimping piece 221 and the conductor portion 2 can be filled by restoring the elastic piece 224. Thereby, the contact resistance between the conductor part 2 and the terminal 210 and the crimping strength of the terminal 210 can be maintained.

  Furthermore, according to the aluminum wire crimp terminal 210 of the present embodiment, the elastic piece 224 is supported by the bottom plate portion 220 of the conductor holding portion 213 at both ends thereof. According to such a configuration, the strength of the elastic piece 224 can be improved as compared with the elastic pieces 24 and 124 of the first and second embodiments described above in which one end portion is a free end, and the conductor portion 2 and the contact resistance between the terminal 210 and the crimping strength of the terminal 210 can be more reliably maintained.

  The elastic piece 224 is not limited to the above configuration, and for example, a pair of slits extending in a direction perpendicular to the axial direction of the conductor portion 2 is formed in the bottom plate portion 220, and a region between the pair of slits is formed. It is also possible to divide from the bottom plate portion 220 and form the divided region by punching out from the bottom plate portion 220.

(Fourth embodiment)
FIG. 9 is a perspective view of a fourth embodiment of the crimp terminal for an aluminum electric wire according to the present invention, FIG. 10 is a developed view of the terminal of FIG. 9, and FIG. 11 is a sectional view of the terminal of FIG. In addition, description is abbreviate | omitted or simplified by attaching | subjecting an equivalent code | symbol in a figure to the site | part which is functionally common with the crimp terminal for aluminum electric wires of 1st Embodiment mentioned above.

  As shown in FIG. 9, the terminal 310 to be crimped to the terminal portion of the aluminum electric wire 1 is provided with a connection portion 311, a conductor holding portion 313, and a sheath holding portion 314.

  The terminal 310 further includes an elastic piece 324 inside the conductor holding portion 313. The elastic piece 324 is formed by cutting and raising from each conductor crimping piece 321 of the conductor holding portion 313 with reference to FIG. As described above, the edge 324a of the elastic piece 324 formed by cutting out from the plate material is sharp.

  In the terminal 310, the pair of conductor crimping pieces 321 of the conductor holding portion 313 are crimped to the conductor portion 2 of the aluminum electric wire 1 placed on the bottom plate portion 320 of the conductor holding portion 313, and the sheath holding portion 314 The pair of sheath crimping pieces 323 are crimped to the sheath 4 of the aluminum electric wire 1 placed on the bottom plate portion 322 of the sheath holding portion 314 and are crimped to the electric wire 1.

  As shown in FIG. 11, the conductor portion 2 contacts the sharp edge 324 a of the elastic piece 324 in the process in which the pair of conductor crimping pieces 321 is crimped and compressed. Each strand 3 of the conductor portion 2 in contact with the edge 324a is scraped off of the oxide film on the surface thereof to expose the aluminum or aluminum alloy substrate. Thereby, good conduction is ensured between the conductor portion 2 and the terminal 310.

  And the conductor part 2 which the pair of conductor crimping pieces 321 was crimped and compressed presses each elastic piece 324 toward the conductor crimping piece 321 side where it was cut and raised. Thereby, each elastic piece 324 is elastically bent and deformed toward the conductor crimping piece 321, and an elastic reaction force is applied to the conductor portion 2.

  According to the aluminum wire crimping terminal 310 of the present embodiment, the oxide film on the surface of each strand 3 of the conductor portion 2 can be removed by the sharp edge 324a provided on the elastic piece 324. Thereby, the contact resistance between the conductor part 2 and the terminal 310 can be reduced without increasing the compression rate of the conductor part 2, and the compression strength of the terminal 310 is set to the same compression ratio as that of the copper wire. Can be secured. Further, even when a springback occurs in the conductor crimping piece 321, the gap between the conductor crimping piece 321 and the conductor portion 2 can be filled by restoring the elastic piece 324. Thereby, the contact resistance between the conductor part 2 and the terminal 310 and the crimping strength of the terminal 310 can be maintained.

  And the crimp terminal 310 for aluminum electric wires of this embodiment forms the elastic piece 324 in the pair of conductor crimping pieces 321 of the conductor holding part 313. When the diameter of the aluminum wire 1 is thin, the width of the bottom plate portion 320 of the conductor holding portion 313 is also narrowed corresponding to the diameter of the aluminum wire 1. Therefore, it becomes difficult to form an elastic piece along the bottom plate portion 320 as in the first to third embodiments described above. On the other hand, the conductor crimping piece 321 has a certain length even when the diameter of the aluminum electric wire 1 is thin, and it is relatively easy to cut the elastic piece 324 there. Therefore, the aluminum wire crimp terminal 310 of the present embodiment is particularly suitable when the diameter of the aluminum wire 1 is thin.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the shape, size, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

It is a perspective view of 1st Embodiment of the crimp terminal for aluminum electric wires of this invention. FIG. 2 is a development view of the terminal of FIG. 1. It is sectional drawing of the terminal of FIG. It is a perspective view of 2nd Embodiment of the crimp terminal for aluminum electric wires of this invention. FIG. 5 is a development view of the terminals of FIG. 4. It is a perspective view of 3rd Embodiment of the crimp terminal for aluminum electric wires of this invention. FIG. 7 is a development view of the terminals of FIG. 6. It is sectional drawing of the terminal of FIG. It is a perspective view of 4th Embodiment of the crimp terminal for aluminum electric wires of this invention. FIG. 10 is a development view of the terminals of FIG. 9. FIG. 10 is a cross-sectional view of the terminal of FIG. 9. It is a side view which shows the crimping | compression-bonding structure of the terminal to the conventional aluminum electric wire.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Aluminum electric wire 2 Conductor part 3 Elementary wire 10 Crimp terminal for aluminum electric wires 13 Conductor holding part 20 Bottom plate part 21 Conductor crimping piece 24 Elastic piece 24a Edge 110 Aluminum electric wire crimping terminal 113 Conductor holding part 115 Carrier 120 Bottom plate part 121 Conductor addition Clamping piece 124 Elastic piece 124a Edge 210 Aluminum wire crimping terminal 213 Conductor holding part 220 Bottom plate part 221 Conductor crimping piece 224 Elastic piece 224a Edge 225 Slit 310 Aluminum wire crimping terminal 313 Conductor holding part 320 Bottom plate part 321 Conductor clamping piece 324 elastic piece 324a edge

Claims (4)

A crimp terminal for an aluminum wire that is crimped to an aluminum wire having a conductor portion in which a plurality of strands made of aluminum or an aluminum alloy are twisted together,
A bottom plate portion on which the conductor portion is placed;
A pair of conductor crimping pieces that are connected to the bottom plate portion and are crimped to the conductor portion so as to sandwich the conductor portion on the bottom plate portion;
An elastic piece for pressing the conductor portion provided inside a conductor holding portion formed by the bottom plate portion and the pair of conductor crimping pieces;
With
A crimp terminal for an aluminum electric wire, wherein a sharp edge is provided at a contact portion of the elastic piece with the conductor portion.   2. The aluminum electric wire according to claim 1, wherein the elastic piece is a section continuous to the bottom plate portion, and is folded and overlapped with the bottom plate portion with a gap between the elastic piece and the bottom plate portion. Crimp terminal.   2. The crimp terminal for an aluminum electric wire according to claim 1, wherein the elastic piece is separated from the bottom plate portion by a pair of slits formed in parallel with the bottom plate portion, and is punched out from the bottom plate portion. .   The crimp terminal for an aluminum electric wire according to claim 1, wherein the elastic piece is cut and raised from each of the conductor crimping pieces.

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