JP2010055874A - Connection structure of terminal metal fitting and electric wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve prevention of formation of electric corrosion at a connected part of a conductor and a terminal metal fitting in the case the conductor and the terminal metal fitting of an electric wire are made of a different kind of metal. <P>SOLUTION: An electric wire crimped part 26 of an open barrel shape formed in the terminal metal fitting 20A and the front end part of the electric wire 10 in which the conductor 11 composed of the different kind of metal from the terminal metal fitting 20A is surrounded by an insulating cover 12 are connected. Since a part protruding forward from the front end of the electric wire crimped part 22 out of the conductor 11 exposed by removing the insulating cover 12 is covered by a covering part 30, there is no possibility of sticking of an electrolytic solution, and formation of electric corrosion due to sticking of the electrolytic solution can be prevented. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a connection structure between a terminal fitting and an electric wire.

Patent Document 1 discloses a technique in which an aluminum conductor is used in place of a conventional copper alloy conductor in order to reduce the weight of an electric wire in a connection structure between a terminal fitting and an electric wire. In this connection structure, a conventional copper alloy is used for the terminal fitting.
JP 2003-317817 A

  As described above, when the conductor of the electric wire and the terminal metal fitting are different metals, if an electrolytic solution such as moisture is present at the connection portion between the two, electrolytic corrosion, i.e., both metals dissolve as ions in the electrolytic solution and are electrically There is a possibility that a phenomenon of corrosion progresses due to a chemical reaction. When electric corrosion occurs, the contact resistance between the conductor and the terminal fitting increases, so a countermeasure is required.

  The present invention has been completed based on the above circumstances, and in the case where the conductor of the electric wire and the terminal fitting are different metals, the prevention of the occurrence of electrolytic corrosion at the connection portion between the conductor and the terminal fitting. The purpose is to plan.

  As a means for achieving the above object, the invention of claim 1 is an electric wire in which an open barrel-shaped wire crimping portion formed on a terminal fitting and a conductor made of a metal different from the terminal fitting are surrounded by an insulating coating. A connection structure for connecting the front end portion of the conductor, wherein the terminal fitting covers a portion of the conductor exposed by removing the insulating coating and protruding forward from the front end of the wire crimping portion. It is characterized in that the part is provided.

  Invention of Claim 2 is the thing of Claim 1, The said electric wire crimping | compression-bonding part is provided with the baseplate and a pair of crimping piece which stands up from the right-and-left both-sides edge of the said baseplate, The said conductor is the said baseplate. The crimping is performed in a state of being surrounded by the pair of caulking pieces, and the cover part is characterized in that it has a form extending forward from the front end of the caulking pieces.

  According to a third aspect of the present invention, in the device according to the first or second aspect, the terminal fitting functions as a connecting means for connecting with a mating terminal, a rear end of the terminal connecting portion, and the electric wire. A connecting portion that connects the front end of the crimping portion, a portion of the conductor that protrudes forward from the wire crimping portion is located in the connecting portion, and the cover portion extends from the connecting portion. It has a feature in the form that it comes out.

  Invention of Claim 4 is a thing in any one of Claim 1 thru | or 3. WHEREIN: The said wire crimping | compression-bonding part is located behind the wire barrel part to which the said conductor connects by crimping, and the said wire barrel part And an insulation barrel portion to which a portion covered with the insulating coating of the electric wire is crimped. The wire crimping portion extends rearward from the rear end of the wire barrel portion. It is characterized in that a flange portion is formed so as to overlap the outer periphery of the front end portion of the insulating coating.

  The invention of claim 5 is characterized in that, in the invention of claim 4, the rear end of the flange portion is continuous with the insulation barrel portion.

<Invention of Claim 1>
Conventionally, the portion of the conductor that protrudes forward from the front end of the wire crimping portion has been exposed and an electrolytic solution such as water is liable to adhere to it, and thus has been subject to electrolytic corrosion. On the other hand, in the present invention, the portion of the conductor that protrudes forward from the front end of the wire crimping portion is covered with the covering portion, so that there is no possibility that the electrolytic solution adheres, and the electric current caused by the attachment of the electrolytic solution is present. The occurrence of food can be prevented.

<Invention of Claim 2>
Since the cover part is formed integrally with the crimping piece, there is no possibility that the electrolyte enters from the gap between the cover part and the crimping piece and adheres to the conductor.

<Invention of Claim 3>
Since the cover part is formed integrally with the connecting part, there is no possibility that the electrolyte enters from the gap between the cover part and the connecting part and adheres to the conductor.

<Invention of Claim 4>
The portion of the conductor from which the insulation coating is removed behind the wire barrel portion is covered by the flange portion, so that there is no possibility that the electrolyte adheres to the conductor in the gap between the wire barrel portion and the insulation barrel portion. .

<Invention of Claim 5>
Since the rear end of the flange portion is continuous with the insulation barrel portion, there is no possibility that the electrolyte enters the gap between the flange portion and the insulation barrel portion.

<Embodiment 1>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The electric wire 10 according to the first embodiment includes an electric conductor 10 made of a stranded wire obtained by twisting a plurality of fine metal wires, and an insulating coating 12 surrounding the conductor 11. At the front end portion of the electric wire 10, the front end portion of the conductor 11 is exposed by removing the insulating coating 12 in advance in preparation for connection to the terminal fitting 20 </ b> A. As the material of the conductor 11, an aluminum alloy is used for the aluminum sphere. The property of the material of the conductor 11 is that it is more rigid than copper and has a lower conductivity than copper.

  A terminal fitting 20A is connected to the front end portion of the electric wire 10 by crimping. The terminal fitting 20A is made of a metal different from the conductor 11 (ie, copper or copper alloy), and is formed by bending a metal plate material (not shown) punched into a predetermined shape. The terminal fitting 20A is of a female shape, and the front end side portion (the left side portion in FIGS. 1 and 2) is a terminal connecting portion 21 having a rectangular tube shape. The terminal connection portion 21 is of a well-known form that functions as a connection means with an elongated tab (not shown) of a male counterpart terminal.

  A connecting portion 22 is connected to the rear end of the terminal connecting portion 21. The connecting portion 22 includes a flat bottom wall 23 that is continuous with the bottom wall of the terminal connecting portion 21, and a pair of left and right symmetrical side walls 24 that rise substantially at right angles from the left and right side edges of the bottom wall 23. The height of the side wall 24 is lower than that of the terminal connection portion 21. An accommodation space 25 opened upward is formed inside the connecting portion 22.

  An electric wire crimping portion 26 for crimping the front end portion of the electric wire 10 is connected to the rear end of the connecting portion 22. A front end side portion of the wire crimping portion 26 is a wire barrel portion 27, and a rear end side portion of the wire crimping portion 26 is an insulation barrel portion 28. The rear end of the wire barrel portion 27 and the front end of the insulation barrel portion 28 are connected by a connecting portion 29. The connecting portion 29 has a form in which a pair of laterally symmetrical side plates 29b are raised from the left and right side edges of the bottom plate 29a.

  The wire barrel portion 27 is for crimping the front end portion of the conductor 11, and has a form in which a pair of symmetrical first caulking pieces 27b are extended from the left and right side edges of the first bottom plate 27a. The conductor 11 crimped to the wire barrel portion 27 is surrounded and pressurized by the first bottom plate 27a and the pair of first caulking pieces 27b, and the wire barrel portion is caused by the fixing force generated by the pressurization. 27 is fixed to be conductive. In the crimped state, the front end portion of the conductor 11 protrudes further forward than the front end edge of the first caulking piece 27 b and is positioned in the accommodating space 25 in the connecting portion 22.

  The insulation barrel portion 28 is for crimping a portion of the front end portion of the electric wire 10 that is covered with the insulating coating 12, and a pair of second caulking pieces that are symmetrical from the left and right side edges of the second bottom plate 28a. It is the form which extended 28b. The electric wire 10 crimped to the insulation barrel portion 28 is surrounded and pressurized by the second bottom plate 28a and the pair of second caulking pieces 28b, and is insulated by the fixing force generated by the pressurization. It is fixed to the barrel portion 28.

  In the crimped state, the front end portion of the insulating coating 12 protrudes further forward than the front end edge of the second caulking piece 28b and is positioned forward of the rear end edge of the first caulking piece 27b. The rear end portion of the exposed portion of the conductor 11 and the front end portion of the insulating coating 12 are located in the region between the first caulking piece 27b and the second caulking piece 28b in the front-rear direction (the region corresponding to the connecting portion 29). is doing.

  The terminal fitting 20 </ b> A is integrally formed with a cover portion 30 for covering a portion of the conductor 11 exposed by removing the insulating coating 12 and protruding forward from the front end of the wire barrel portion 27. The cover portion 30 is connected to the front end edge of the first caulking piece 27 b of the wire barrel portion 27 and the rising end edge (upper end edge) of the side wall 24 of the connecting portion 22. That is, the cover portion 30 extends forward from the first caulking piece 27b, covers the outer periphery of the front end portion of the conductor 11 from above, and covers the front end surface of the conductor 11 from the front.

  Further, the wire crimping portion 26 is integrally formed with a flange portion 31 that extends rearward from the rear end of the first caulking piece 27 b of the wire barrel portion 27 and overlaps the outer periphery of the front end portion of the insulating coating 12. . The flange 31 is continuous with the rear end edge of the first caulking piece 27b, the front end edge of the second caulking piece 28b, and the rising end edge (upper end edge) of the side plate 29b of the connecting portion 29. Therefore, between the wire barrel portion 27 and the insulation barrel portion 28, the conductor 11 and the insulating coating 12 are completely covered and are not exposed to the outside.

  Conventionally, the portion of the conductor that protrudes forward from the front end of the wire crimping portion has been exposed and an electrolytic solution such as water is liable to adhere to it, and thus has been subject to electrolytic corrosion. On the other hand, in this Embodiment 1, since the part which protruded ahead from the front end of the electric wire crimping part 26 among the conductors 11 is covered with the cover part 30, the front end part (it protrudes ahead from the wire barrel part 27) of the conductor 11 is covered. There is no risk that the electrolytic solution adheres to the portion), and the occurrence of electrolytic corrosion due to the adhesion of the electrolytic solution can be prevented.

  In particular, in the present embodiment, the rear end of the cover portion 30 is continuous with the first caulking piece 27b, and the side edge of the cover portion 30 is continuous with the side wall 24 of the connecting portion 22. Therefore, the cover portion 30 and the first caulking portion are connected. Intrusion of the electrolytic solution is surely prevented even in the gap with the piece 27 b and between the cover portion 30 and the side wall 24.

  Further, since the flange portion 31 is formed between the wire barrel portion 27 and the insulation barrel portion 28 so that the conductor 11 and the insulating coating 12 are not exposed, the wire barrel portion 27 and the insulation barrel portion 28 are not exposed. There is no risk of electrolyte intrusion from the gap. In particular, the front end of the flange 31 is connected to the first crimping piece 27b, the rear end of the flange 31 is connected to the second crimping piece 28b, and the side edge of the flange 31 is connected to the side plate 29b. Intrusion is reliably prevented.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. In the terminal fitting 20B of the second embodiment, the cover portion 32 and the collar portion 34 are configured differently from the first embodiment. Since other configurations are the same as those of the first embodiment, the same configurations are denoted by the same reference numerals, and descriptions of structures, operations, and effects are omitted.

  The cover part 32 of the second embodiment is a form extending forward from the front end edge of the first caulking piece 27 b of the wire barrel part 27, and is not directly connected to the side wall 24 of the connecting part 22. The cover portion 32 covers the outer periphery of the front end portion of the conductor 11 from above and covers the front end surface of the conductor 11 from the front. Further, the front end side portion of the cover portion 32 is an inclined portion 33 inclined forward so as to approach the bottom wall 23 toward the front. The inclined portion 33 is located between the left and right side walls 24, and the front end side portion of the inclined portion 33 is accommodated in the accommodating space 25 and covers the conductor 11 from the front. On the other hand, the flange 34 extending rearward from the rear end of the first caulking piece 27b and overlapping the outer periphery of the front end portion of the insulating coating 12 rises from the rear end edge of the first caulking piece 27b and the side plate 29b of the connecting portion 29. Although it continues to the front end side region of the end edge (upper end edge), it does not continue directly to the second crimping piece 28b. Therefore, a part of the insulating coating 12 is exposed between the rear end of the flange 34 and the second crimping piece 28b.

<Embodiment 3>
Next, a third embodiment of the present invention will be described with reference to FIGS. The terminal fitting 20C of the third embodiment is different from the first and second embodiments in that the cover portion 32 has the same form as that of the second embodiment and does not have a collar portion. ing. In addition, the substantially front half region (front end side region) of the cover portion 32 is an inclined portion 33 that is inclined forward so as to approach the bottom wall 23 of the connecting portion 22 toward the front. Are cut obliquely according to the inclined portion 33. The front end surface 11F of the conductor 11 cut obliquely is in contact with the inclined portion 33 of the cover portion 32 so as to abut from the rear. Since other configurations are the same as those in the first embodiment or the second embodiment, the same components are denoted by the same reference numerals, and descriptions of the structure, operation, and effects are omitted.

<Embodiment 4>
Next, a fourth embodiment of the present invention will be described with reference to FIGS. In the terminal fitting 20D of the fourth embodiment, the cover portion 35 is configured differently from the first to third embodiments, and the flange portion 34 having the same form as that of the second embodiment is formed. The cover portion 35 of the fourth embodiment is integrally formed on the left and right side walls 24 of the connecting portion 22. The front end side portion (substantially the first half region) of the cover portion 35 is an inclined portion 36 that is inclined so as to approach the bottom wall 23 of the connecting portion 22 toward the front. The inclined portion 36 is disposed in the accommodating space 25 of the connecting portion 22 and is positioned so as to cover the conductor 11 from the front. The substantially second half region at the side edge of the cover portion 35 continues to the rising edge of the side wall 24, but the substantially first half region at the side edge of the cover portion 35 (that is, the side edge of the inclined portion 36) rises. It is not directly connected to the edge. Further, the cover portion 35 is not directly connected to the first caulking piece 27 b of the wire barrel portion 27. Since other configurations are the same as those in the first embodiment or the second embodiment, the same components are denoted by the same reference numerals, and descriptions of the structure, operation, and effects are omitted.

<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 Embodiments 1 to 4 described above, the cover is formed integrally with the terminal fitting, but the cover may be a separate component from the terminal fitting.
(2) The form in which the cover part of Embodiment 1 continues to both the wire barrel part and the connecting part can also be applied to Embodiments 2 to 4.
(3) The form which the collar part of Embodiment 1 continued to the insulation barrel part is applicable also to Embodiments 2-4.
(4) The form in which the collar part and the insulation barrel part of Embodiment 2 are not directly connected can also be applied to Embodiment 1.
(5) The form in which the cover part and the connection part of Embodiments 2 and 3 are not directly connected can also be applied to Embodiment 1.
(6) The form which forms the collar part of Embodiment 1, 2, 4 is applicable also to Embodiment 3. FIG.
(7) The form in which the cover part of Embodiment 4 is not directly connected to the wire barrel part can also be applied to Embodiments 1 to 3.
(8) The form in which the cover portion of the third embodiment contacts the front end surface of the conductor can also be applied to the first, second, and fourth embodiments.
(9) The configuration in which the front end face of the conductor of the third embodiment is inclined with respect to the axis of the electric wire can be applied to the first, second, and fourth embodiments.
(10) In the first to fourth embodiments, the female terminal fitting in which the terminal connecting portion has a rectangular tube shape has been described. However, the present invention can also be applied to a male terminal fitting in which the terminal connecting portion has an elongated tab. .
(11) Although the conductor is a stranded wire in the above embodiment, the present invention can also be applied when the conductor is a single core wire.

Side view of Embodiment 1 Plan view Side view of Embodiment 2 Plan view Side view of Embodiment 3 Plan view Partial cutaway view Side view of Embodiment 4 Plan view

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Electric wire 11 ... Conductor 12 ... Insulation coating 20A ... Terminal metal fitting 21 ... Terminal connection part 22 ... Connection part 26 ... Electric wire crimping part 27 ... Wire barrel part 27a ... 1st bottom plate 27b ... 1st crimping piece 29 ... Insulation barrel part DESCRIPTION OF SYMBOLS 30 ... Cover part 31 ... Gutter part 20B, 20C, 20D ... Terminal metal fitting 32, 35 ... Cover part 34 ... Gutter part

Claims (5)

A connection structure for connecting an open barrel-shaped wire crimping portion formed on a terminal fitting and a front end portion of an electric wire in which the terminal fitting surrounds a conductor made of a different metal with an insulating coating,
The terminal fitting is provided with a covering portion for covering a portion of the conductor exposed by removing the insulating coating and projecting forward from the front end of the wire crimping portion. Connection structure. The electric wire crimping portion includes a bottom plate and a pair of caulking pieces rising from left and right side edges of the bottom plate;
The conductor is crimped in a state surrounded by the bottom plate and the pair of caulking pieces,
The terminal metal fitting and electric wire connection structure according to claim 1, wherein the cover portion has a form extending forward from a front end of the caulking piece. The terminal fitting has a terminal connecting portion that functions as a connection means with a mating terminal, and a connecting portion that connects a rear end of the terminal connecting portion and a front end of the wire crimping portion;
The portion of the conductor that protrudes forward from the wire crimping portion is located in the connecting portion,
The terminal metal fitting and electric wire connection structure according to claim 1, wherein the cover portion is extended from the connecting portion. The wire crimping portion is a wire barrel portion to which the conductor is connected by crimping, and an insulation barrel portion in which a portion of the wire covered with the insulating coating is crimped and positioned behind the wire barrel portion. And configured with
The hook portion is formed in the wire crimping portion so as to extend rearward from the rear end of the wire barrel portion and overlap the outer periphery of the front end portion of the insulating coating. 4. The terminal metal fitting and electric wire connection structure according to any one of 3 above.   The terminal fitting and electric wire connection structure according to claim 4, wherein a rear end of the flange portion is continuous with the insulation barrel portion.

Images