JP6301724B2 - Contact connection structure - Google Patents

Description

  The present invention relates to a terminal contact connection structure.

  Various terminals that have been proposed in the past have been proposed in Patent Document 1 and female terminals 100 and male terminals 200 as shown in FIGS.

  As shown in FIGS. 8 and 9, the female terminal 100 includes a rectangular box portion 101 and an elastic deflecting portion 102 provided in the box portion 101 and disposed in the box portion 101.

  The elastic deflecting portion 102 is provided with an indent portion 103 that protrudes toward the bottom surface side.

  The indent portion 103 has a substantially spherical outer peripheral surface, and the center vertex is located at the lowest position.

  The female terminal 100 is tin-plated from the viewpoints of improving connection reliability in a high temperature environment and improving corrosion resistance in a corrosive environment.

  The male terminal 200 has a flat tab portion 201. The male terminal 200 is tin-plated from the viewpoints of improving connection reliability in a high-temperature environment and improving corrosion resistance in a corrosive environment.

  In such a terminal, as shown in FIG. 9, when the tab portion 201 of the male terminal 200 is inserted into the box portion 101 of the female terminal 100, the elastic bending portion 102 is deformed and the insertion of the tab portion 201 is allowed. .

  In the insertion process of the tab portion 201, the tab portion 201 slides on the indent portion 103 of the elastic bending portion 102, and at the terminal insertion completion position, as shown in FIGS. The surface of the tab part 201 contacts.

  In this conventional example, the indentation part 103 of the female terminal 100 and the contact surface of the tab part 201 of the male terminal 200 are in electrical contact with each other using the bending return force of the elastic bending part 102 as a contact load. And when an electric current flows through this contact surface, between the female terminal 100 and the male terminal 200 will energize.

  By the way, the outer surface of the elastic bending part 102 and the tab part 201 is tin-plated over the whole area. As shown in FIG. 11, a copper / tin alloy layer B and a tin plating layer C are formed on the outer surface side of the base material layer A of the copper alloy material by tin-plating both terminals and further performing a reflow process. An oxide film D is formed on the outer surface of the tin plating layer C.

  Since the oxide film D has a very high electrical resistivity compared to tin and copper, it is necessary to destroy the oxide film D and create a large number of contact surfaces (ohmic points) between the tin plating layers C to reduce the contact resistance. There is.

  In the conventional contact connection structure, the oxide film is destroyed by the contact load between the contact surfaces of the indent portion and the tab portion, and the contact between the plated metal of the indent portion and the tab portion is obtained at the location where the oxide film is destroyed. I am trying to do it.

JP 2007-280825 A

  However, in the terminal described in the conventional example, it is conceivable to increase the contact pressure between the contact portions in order to promote the destruction of the oxide film, but there is a problem that both terminals are enlarged and the structure becomes complicated. there were.

  Accordingly, an object of the present invention is to provide a terminal capable of reducing contact resistance without increasing the size of the terminal or complicating the structure as much as possible in order to solve the above-described problems.

In order to solve the above-mentioned problem, in the invention of claim 1, a first contact portion provided on the first terminal, having an indent portion projecting thereon and having a plating layer formed on the surface , and the first terminal are provided. provided in the second terminal connected, the fitting recess is formed, and a second contact portion where the plating layer formed on the surface, the indentation portion before Symbol first contact portion is the first 2 is a contact connection structure that slides on the contact surface of the two contact portions and contacts the second contact portion by fitting the indent portion into the fitting recess at the terminal insertion completion position. It is characterized in that at least one of the concave portion and the convex portion is formed on the surface of the surface in a state of either one of the radial stripe and the concentric circle.

  According to the first aspect of the present invention, at least one of the concave portion and the convex portion is formed on the surface of the fitting concave portion so as to be arranged in at least one of a radial shape and a concentric shape. Yes.

  In this way, when a contact load is applied between the contact surface between the indent portion and the fitting recess by forming the recess or the projection, the recess or projection causes the contact surface between the indent portion and the fitting recess. Local pressure can be applied.

  As a result, the destruction of the oxide film formed on the surface of the indent portion and the surface of the fitting recess is promoted, and the contact between the plating metal of the indent portion and the fitting recess can be obtained at the location where the oxide film is broken. it can.

  Therefore, the contact resistance can be reduced without increasing the size of the terminal or making it as complex as possible.

It is sectional drawing of the female terminal and male terminal which show the state before the terminal insertion of this invention. It is sectional drawing of the female terminal and male terminal which show the state of the terminal insertion completion position of this invention. It is explanatory drawing explaining the state by which the oxide film formed in the indent part and fitting recessed part of this invention is destroyed. It is explanatory drawing explaining the state which the oxide film formed in the indent part of this invention and the fitting recessed part is destroyed, and plating metals contact. It is a perspective view which shows typically the convex part formed in the fitting recessed part of this invention. It is a perspective view which shows typically the 1st modification of the convex part formed in the fitting recessed part of this invention. It is a perspective view which shows typically the 2nd modification of the convex part formed in the fitting recessed part of this invention. It is sectional drawing of the female terminal and male terminal which show the state before terminal insertion of a prior art example. It is sectional drawing of the female terminal and male terminal which show the state of the terminal insertion completion position of a prior art example. It is a contact connection principal part enlarged view of the female terminal and male terminal of a prior art example. It is the schematic which shows the plating layer of a terminal.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, a terminal in which the terminal connection structure of the present invention is used includes a female terminal 1 and a male terminal 2. The female terminal 1 is disposed in a terminal accommodating chamber in a female connector housing (not shown).

  The female terminal 1 is tin-plated on the surface and includes a box portion 3 as a first contact portion.

  The box portion 3 is formed in a square shape with an opening at the front, and includes an elastic bending portion 5a formed by bending the upper surface inward, and a bottom surface portion 5b protruding from the lower surface toward the upper surface. Yes.

  The elastic bending part 5a has elasticity and is formed to be inclined from the upper surface of the box part 3 to the lower surface. Moreover, the indent part 7 which protrudes toward the bottom face side is formed in the surface of the elastic bending part 5a.

  The indent portion 7 protrudes in a spherical shape from the elastic deflecting portion 5a, and the center position is located at the lowermost portion of the spherical shape. Since the indent portion 7 is formed in the elastic deflection portion 5a, it can be displaced in the vertical direction.

  The bottom surface portion 5 b is formed at a position substantially opposite to the indent portion 7 with a predetermined interval, and the male terminal 2 is inserted between the bottom surface portion 5 b and the indent portion 7.

  The male terminal 2 is tin-plated on the surface and includes a tab portion 4 as a second contact portion.

  The tab portion 4 is inserted between the bottom surface portion 5 b of the female terminal 1 and the indent portion 7 at the tip.

  In the present embodiment, a fitting recess 6 is formed on the surface of the tab portion 4 facing the indent portion 7 so that the indent portion 7 is fitted into the fitting recess 6 at the terminal insertion completion position. ing.

  The fitting recess 6 is formed by press molding. And the fitting recessed part 6 is formed in the taper shape which diameter-expands toward an opening side by sectional view, and has the substantially flat bottom face part 6c and the slope part 6d which inclines at a side part. The bottom surface portion 6 c and the inclined surface portion 6 d serve as the surface 6 b of the fitting recess 6.

  By the way, the outer surface of the elastic bending part 5a and the tab part 4 is tin-plated over the entire region, and the copper / tin alloy layer B, the tin plating layer is formed on the outer surface side of the base material layer A of the copper alloy material. C is formed, and an oxide film D is formed on the outer surface of the tin plating layer C (see FIG. 11).

  Since this oxide film D has a very high electrical resistivity as compared with tin and copper, even if the oxide films D are brought into contact with each other, a good electrical connection cannot be obtained.

  Therefore, the oxide film D is destroyed by the contact load between the contact surfaces of the indent portion 7 and the tab portion 4, and the plated metals of the indent portion 7 and the tab portion 4 are brought into contact with each other at the location where the oxide film D is destroyed. Thus, it is common to obtain a better electrical connection.

  At this time, it is preferable that the destruction of the oxide film D can be further promoted.

  Therefore, in this embodiment, the destruction of the oxide film D can be further promoted.

  Specifically, a convex portion (at least one of the concave portion and the convex portion) 6 a was formed on the surface 6 b of the fitting concave portion 6.

  Thus, by forming a convex portion (at least one of the concave portion and the convex portion) 6 a on the surface 6 b of the fitting concave portion 6, a contact load is applied between the contact surfaces of the indent portion 7 and the fitting concave portion 6. When working, a local pressure can be applied between the contact surfaces of the indented portion 7 and the fitting recessed portion 6 by the recessed portion or the protruding portion 6a.

  Here, the present inventor has grasped by visualization that the oxide film D is broken concentrically or radially at a plurality of locations when a load is applied between the contact surfaces of the indent portion 7 and the tab portion 4.

  Therefore, the convex portion (at least one of the concave portion and the convex portion) 6a formed on the surface 6b of the fitting concave portion 6 is arranged in at least one of a radial shape and a concentric shape, and the oxide film D was further promoted to crack concentrically or radially.

  In the present embodiment, as shown in FIG. 5, a plurality of convex portions (at least one of the concave portions and the convex portions) 6a are formed linearly on the slope portion (surface), and are formed radially as a whole. To be.

  Next, an example of a state in which the female terminal 1 and the male terminal 2 are electrically connected will be described.

  First, as shown in FIG. 1, the tab portion 4 of the male terminal 2 is inserted from the opening side of the box portion 3 of the female terminal 1. The tab portion 4 inserted from the opening of the box portion 3 is inserted between the indent portion 7 and the bottom surface portion 5b. At this time, the tab portion 4 slides on the indent portion 7 and the bottom surface portion 5b, pushes the elastic bending portion 5a upward, and elastically deforms in a direction in which the indent portion 7 and the bottom surface portion 5b are separated from each other.

  When the tab portion 4 is further inserted into the female terminal 1, the terminal insertion completion position shown in FIG. 2 is reached, and the indent portion 7 is fitted into the fitting recess 6.

  Thus, in the state where the tab portion 4 is inserted to the terminal insertion completion position, a bending return force is generated in the elastic bending portion 5 a, and the contact between the indent portion 7 and the fitting recess 6 is caused by this bending return force. The contact load will act on the.

  At this time, the surface of the indent portion 7 is locally pressed by the convex portion (at least one of the concave portion and the convex portion) 6 a formed in the fitting concave portion 6. In the present embodiment, the surface of the indent portion 7 is pressed radially.

  As a result, it is promoted that the oxide film D on the surface of the indent portion 7 is radially cracked, and the oxide film D is cracked (see FIG. 3). On the other hand, since the pressing force is concentrated on the convex portion (at least one of the concave portion and the convex portion) 6a, the oxide film D of the convex portion (at least one of the concave portion and the convex portion) 6a is cracked. Is likely to occur (see FIG. 3).

  When the oxide film D is cracked, the plating layer C enters the surface through the gap between the oxide films D (see FIG. 4).

  Thus, as the plating layer C enters the surface through the gap between the oxide films D, the plating layers C (the plating metal of the indent portion 7 and the fitting recess 6) contact each other as shown in FIG. Better electrical connection can be obtained.

  As described above, in the present embodiment, at least one of the concave portion and the convex portion 6a is arranged on the surface of the fitting concave portion 6 in a state of at least one of a radial shape and a concentric shape. Forming.

  In this way, when the contact load is applied between the contact surfaces of the indent 7 and the fitting recess 6 by forming the recess or the projection 6a, the indent 7 and the fitting recess are formed by the recess or the projection 6a. A local pressure can be applied between the six contact surfaces.

  As a result, the destruction of the oxide film D formed on the surface of the indent portion 7 and the surface of the fitting recess 6 is promoted, and the plated metals of the indent portion 7 and the fitting recess 6 are exchanged at the location where the oxide film D is broken. Contact can be obtained.

  Therefore, the contact resistance can be reduced without increasing the size of the terminal or making it as complex as possible. In particular, according to the present embodiment, since the oxide film D can be broken even if the contact pressure between the contact portions is reduced, there is an advantage that the terminal can be easily downsized. .

  The convex portions 6a do not need to be provided continuously in a straight line, and as shown in FIG. 6, the convex portions 6a can be provided so as to be scattered in a radial pattern. The shape of each convex part 6a formed at this time can be set as appropriate, such as a circle, a triangle, or a quadrangle. Moreover, each convex part 6a can be formed by embossing, for example.

  Moreover, the convex part 6a can also be provided in a grid | lattice form, as shown in FIG. In other words, the convex portions 6a can be formed so as to be arranged radially and concentrically.

  Moreover, you may make it form the convex part 6a in concentric form.

  In addition, you may make it form a recessed part in the surface of the fitting recessed part 6. FIG. If the recess is formed in this way, the destruction of the oxide film D is promoted by the edge portion of the recess edge.

  Moreover, in this embodiment, although the tin plating layer is formed on the surface of the elastic bending part 5a and the tab part 4, this invention has the same effect if it is a plating layer in which an oxide film other than tin is formed. can get.

3 1st contact part (box part)
4 Second contact part (tab part)
6 fitting recessed part 6a convex part (at least one of a convex part and a recessed part)
6b Surface 7 Indented part

Claims (1)

A first contact portion provided on the first terminal, having an indented portion projecting thereon , and having a plating layer formed on the surface ;
A second contact connected to the first terminal, having a fitting recess , and having a second contact portion with a plating layer formed on the surface ;
Before Symbol slides on the contact surface of the indent portion is the second contact portion of the first contact portion, the terminal insertion completion position, the second contact portion and the indentation portion is fitted into the fitting recess A contact connection structure for contacting,
On the surface of the fitting recess, at least one of the recess and the protrusion is formed so as to be arranged in any one of a radial stripe and a concentric circle. Construction.

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