JP2010040478A - Terminal fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To hardly receive external effects at a crimped section between a wire barrel section and a core wire. <P>SOLUTION: In terminal metal fittings 1, having the wire barrel section 4 for crimping a core wire section 7, exposed to an end section of an electric wire W, a deep portion conduction section 9 wherein one end side is connected with a wall surface of the terminal metal fittings 1 and the other end side is extended to the vicinity of the center of the core wire section 7 is arranged. Stability of a conduction function of the terminal metal fittings can be improved in this manner, since a conductive range with the core wire section 7 is secured at a deep portion of the core wire section. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a terminal fitting.

In general, as a structure for connecting the terminal fitting to the end of the electric wire, a structure in which the core portion exposed by peeling off the end portion of the electric wire is caulked by a wire barrel provided on the terminal fitting is well known ( See Patent Document 1 below). Therefore, the conduction region between the terminal fitting and the wire core wire is the outer peripheral portion of the core wire portion that is in close contact with the inner surface of the wire barrel.
JP 2005-174896 A

  However, since the outer peripheral side of the core wire portion, which is an electrically conductive region, is susceptible to external influences such as water, there is a concern that the conduction stability may deteriorate over time.

  This invention is completed based on the above situations, Comprising: It aims at providing the terminal metal fitting which can improve conduction | electrical_connection stability with an electric wire.

  As a means for achieving the above object, the invention of claim 1 is a terminal fitting provided with a wire barrel portion for caulking a core wire portion exposed at an end portion of an electric wire, and one end side is provided on a wall surface of the terminal fitting. The other end side is characterized in that a deep conduction portion extending to the vicinity of the center portion of the core wire portion is provided.

The invention of claim 2 is characterized in that, in the invention of claim 1, the deep conduction portion is formed integrally with the terminal fitting.
According to a third aspect of the present invention, the wire barrel portion includes a barrel piece, and the deep conduction portion includes a narrow connecting portion protruding from a tip edge of the barrel piece, It is characterized in that it is formed from a connecting portion that extends from the connecting portion along the substantially axial direction of the terminal fitting.

  The invention of claim 4 is characterized in that, in the invention of claim 1 or 2, the deep conduction portion extends from a front position of the wire barrel portion toward a center portion in the wire barrel portion. Have.

<Invention of Claim 1>
According to the first aspect of the present invention, by caulking the wire barrel portion to the core wire portion, the outer peripheral portion of the core wire portion is brought into close contact with the wire barrel portion, and a conduction region on the surface layer side is secured. Further, the deep conduction portion extends to the center portion of the core wire, and a conduction region is secured even at a deep location of the core wire. Therefore, even if the conduction function on the surface layer side is reduced due to an external influence, it is difficult to be affected by an external influence in the deep part, so that the conduction function can be reliably maintained here.

<Invention of Claim 2>
If the deep conduction portion is formed integrally with the terminal fitting main body, the structure of the terminal fitting can be simplified.

<Invention of Claim 3>
Since the deep conduction portion is formed at the tip edge of the barrel piece, the conduction portion can be guided to the vicinity of the center portion of the core portion along with the caulking operation of the barrel piece with respect to the core wire portion. Moreover, since the conduction | electrical_connection part and the front-end edge of a barrel piece are formed through the narrow connection part, the path | route into which water approachs along a barrel piece can be restrict | limited narrowly.
<Invention of Claim 4>
If one end side of the deep conduction part is set at a position away from the wire barrel part to the front, the distance from this position to the center part of the core wire part can be increased. It can be made less susceptible to external influences.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In the figure, 1 is a female terminal fitting made of a flat plate made of copper-based metal. A box portion 2 for connection to the mating terminal fitting is formed in the front half. A crimping portion 6 for the electric wire W is formed at the rear portion of the box portion 2 via the connection portion 3. The crimping part 6 is further provided with two barrel parts 4 and 5 located in the front and rear. A wire barrel portion 4 for caulking the core wire portion 7 exposed at the end portion of the electric wire W is disposed on the front side, and an insulation barrel portion 5 for caulking the covered portion of the electric wire is disposed on the rear side. A connecting portion 8 is formed between the barrel portions 4 and 5.

  The wire barrel portion 4 has a pair of barrel pieces 4A projecting in the width direction from both side edges of the bottom wall of the crimping portion 6, and both the barrel pieces 4A are erected upward in the caulking process, while the distal end portion is It is bent in the direction and strongly caulked to the core wire part 7. Thus, the core wire portion 7 is formed with the wire barrel portion 4 and the clamp boundary layer C (region shaded in FIG. 3) on the outer peripheral portion thereof. The clamp boundary layer C is a layered outer peripheral region that is caulked by the wire barrel portion of the core wire portion 7, and is a layer that is continuous in the circumferential direction from the inner surface of the wire barrel portion 4 to the inner end surfaces of both barrel pieces 4A. .

  Further, in the wire barrel part 4, a deep conduction piece 9 (deep conduction part) is provided from the bottom wall. The deep conduction piece 9 is formed by cutting and raising with the center portion of the bottom wall in the width direction and the length direction as the base ends. More specifically, a connecting portion 9A is formed on the deep conduction piece 9 obliquely forward (in the direction toward the box portion 2) from the base end, and straight from the terminal end of the connecting portion 9A along the axial direction. An extended conducting portion 9B is formed. However, the leading end of the conducting portion 9B is located in the back from the front end of the wire barrel portion 4, and the height from the bottom wall is approximately half of the height when the core wire portion 7 is crimped. It is. That is, the deep conduction piece 9 extends toward the center portion of the core wire portion 7 in the crimped state, in other words, extends so as to bite into the inside of the clamp boundary layer C described above.

In the present embodiment, the width of the connecting portion 9A is narrower than the conducting portion 9B on condition that the necessary strength of the deep conducting piece 9 is ensured.
The terminal fitting of Embodiment 1 is configured as described above, and in the case of the terminal fitting of this embodiment, the contact area with the core wire portion 7 is the inner peripheral surface of the wire barrel portion 4 and the outer peripheral portion of the core wire portion 7. In addition to the surface layer side contact area A1 (substantially corresponding to the clamp boundary layer C) ensured at the boundary portion between the core portion 7 and the deep portion side contact secured around the conducting portion 9B in the deep conducting piece 9 Area A2 is added. This has the following advantages.

  For example, when an aluminum wire is used instead of a normal copper wire, there is a concern about electrolytic corrosion with a terminal metal fitting made of a copper-based metal. Since electric corrosion causes an increase in contact resistance, we want to avoid it as much as possible. This electrolytic corrosion phenomenon is further promoted when water is present, but external influences such as water intrusion into the terminal fitting are likely to appear in the surface layer side contact region A1. On the contrary, since the influence is hard to occur at a deep part far from the surface layer, the deep conductive piece 9 is protected from electric corrosion as much as possible, and a good contact state can be obtained over a long period of time. Of course, such an effect is remarkably effective in an aluminum electric wire, but it is also effective in avoiding the influence of rust caused by the ingress of water in a copper electric wire.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the deep conduction pieces 10 are formed on both barrel pieces 4A of the wire barrel part 4, respectively. Both deep conduction pieces 10 are integrally formed from the central portion in the length direction at the front end edge of the barrel piece 4A via a connecting portion 10A having a narrow width. The connecting portion 10A protrudes outward at a substantially right angle from the end edge of the barrel piece 4A, and can bite into the clamp boundary layer C during caulking. From the tip of the connecting portion 10A, a conducting portion 10B is formed so as to project at a right angle in both the front and rear directions (may be projected in only one direction). However, the conducting portion 10B stays within the length range of the wire barrel portion 4 and does not protrude outward in the axial direction from the barrel portion 4.

  Also in the second embodiment configured as described above, as in the first embodiment, the deep conduction piece 10 can eliminate an external influence and ensure a good contact state. In addition, since the pair of deep conduction pieces 10 are provided in the width direction, the guarantee function is enhanced in terms of ensuring a good contact state. In addition, since the opening is not formed in the bottom wall as in the first embodiment, it is effective in avoiding the intrusion of water into the terminal fitting. Furthermore, even when considering the case where water penetrates through the deep conduction piece 10 and enters the terminal fitting, the length of the connecting portion is shorter than the length of the conduction portion 10B, so that a good contact area is ensured. Effective in terms.

<Embodiment 3>
FIG. 6 shows Embodiment 3 of the present invention. In the present embodiment, the base end of the deep conduction piece 11 is arranged in the connection portion 3 between the box portion 2 and the wire barrel portion 4. The deep end conductive piece 11 is welded at this position at the base end (may be formed by cutting and raising from the bottom wall), and from here into the wire barrel portion 4, that is, into the clamp boundary layer C, the core portion 7 It extends obliquely rearward toward the center (the center in the height direction and the length direction).

  Also in the third embodiment formed in this way, the same operational effects as in the other embodiments can be exhibited. In particular, in the third embodiment, the base end position as the water intrusion location is outside the wire barrel portion 4, which is effective in avoiding the influence of water on the core wire portion 7.

<Embodiment 4>
FIG. 7 shows Embodiment 4 of the present invention. In this embodiment, the deep conduction piece 12 is formed separately from the terminal fitting. The deep conduction piece 12 in this embodiment is formed by cutting and raising from the upper surface of a clamp piece 13 formed in a downward substantially U-shape that can be mounted so as to cover the connection part 3 of the terminal fitting from above. Contrary to Embodiment 3, the wire barrel portion 4 extends obliquely downward toward the center of the core wire portion 7 in the wire barrel portion 4.

  In the fourth embodiment, prior to caulking to the core wire portion 7, the clamp piece 4 </ b> A is attached to the terminal metal fitting so that the deep conduction piece 12 is positioned in the wire barrel portion 4. Under this condition, caulking is performed on the core wire portion.

  Also in the fourth embodiment formed as described above, the same operational effects as those of the other embodiments can be exhibited. In particular, since the deep conduction piece 12 is formed separately from the terminal fitting in the fourth embodiment, there is an advantage that the existing terminal fitting can be used.

<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, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

  (1) In the present embodiment, an example in which the present invention is applied to a female terminal fitting has been shown, but the present invention can also be applied to a male terminal fitting.

  (2) Although the case where the deep conductive piece in the embodiment is integrally formed by cutting and raising from the terminal fitting has been shown, it may be joined separately by welding or the like. In this way, since no opening is formed on the bottom surface of the terminal fitting, it is possible to avoid the intrusion of water into the terminal fitting.

Side sectional view which shows the connection state of the terminal metal fitting and electric wire which concern on Embodiment 1. Similarly, a sectional view taken along line II-II in FIG. Explanatory drawing showing the clamp boundary layer Side sectional view which shows the connection state of the terminal metal fitting and electric wire which concern on Embodiment 2. Similarly, a cross-sectional view taken along line VV in FIG. Side sectional view which shows the connection state of the terminal metal fitting and electric wire which concern on Embodiment 3. Side sectional view which shows the connection state of the terminal metal fitting and electric wire which concern on Embodiment 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Terminal metal fitting 4 ... Wire barrel part 7 ... Core wire part 9-12 ... Deep conduction | electrical_connection piece (Deep part conduction | electrical_connection part)
C ... Clamping area W ... Electric wire

Claims (4)

A terminal having a wire barrel portion for caulking the exposed core wire portion at the end of the electric wire, and a clamp boundary layer formed so as to be along the outer peripheral surface of the core wire portion by caulking the core wire portion by the wire barrel portion Metal fittings,
One end side is connected to the wall surface of the terminal fitting, and the other end side is provided with a deep conduction portion extending into the vicinity of the center portion of the core wire portion while biting inside the clamp boundary layer. Hardware. The terminal fitting according to claim 1, wherein the deep conduction portion is formed integrally with the terminal fitting. The wire barrel portion includes a barrel piece, the deep conducting portion includes a narrow connecting portion protruding from a tip edge of the barrel piece, and a conducting portion extending from the connecting portion along a substantially axial direction of the terminal fitting. The terminal fitting according to claim 2, wherein the terminal fitting is formed from. The terminal fitting according to claim 1, wherein the deep part conduction part extends from a front position of the wire barrel part toward a center part in the wire barrel part.

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