JP5151936B2 - Terminal fitting and manufacturing method thereof - Google Patents

Description

The present invention relates to a terminal fitting and a manufacturing method thereof .

Patent Document 1 discloses a conventional terminal fitting. The terminal fitting includes a board portion on which the electric wire is placed, and a pair of barrel pieces that protrude from both sides of the board portion and are crimped from the outside to the core wire that is exposed at the end of the electric wire, and both barrel pieces are caulked to the core wire. By being attached, electrical connection with the electric wire can be taken.
JP 2008-262842 A

  By the way, for example, if a concave portion for reducing the plate thickness is provided on the inner surface of the barrel piece and the core wire is arranged along the inner surface of the concave portion, the holding force to the core wire of both barrel pieces can be increased, and consequently the terminal metal fitting and the electric wire Connection reliability can be improved. However, in this case, if the pressure-bonding force of both barrel pieces is set high, the barrel pieces are expanded along with the caulking operation, so that the thickness of the barrel pieces at the positions corresponding to the recesses is greatly reduced. There is a problem that the strength of the barrel piece is insufficient.

  The present invention has been completed based on the above circumstances, and an object thereof is to ensure the strength of the barrel piece.

As means for achieving the above object, the invention of claim 1 comprises a substrate part on which an electric wire is placed, and a pair of barrel pieces protruding from both sides of the substrate part, wherein both the barrel pieces are the electric wire. A terminal fitting that is crimped from the outside to the core wire exposed at the end of the barrel piece, the outer surface of the barrel piece is provided with a recessed portion recessed on the inner surface side, and the inner surface of the barrel piece is back-to-back with the recessed portion. A convex portion protruding toward the core wire is provided at a position, and the concave portion extends in a direction crossing the wiring direction of the core wire and is spaced in the wiring direction of the core wire in one of the barrel pieces. A plurality of first recesses arranged with a gap extending in a direction intersecting with the wiring direction of the core wire, and a plurality of the first concave portions arranged in the other of the barrel pieces with an interval in the wiring direction of the core wire. From the second recess The convex portion is composed of a first convex portion and a second convex portion that are arranged back to back with each of the first concave portion and the second concave portion, and the first concave portion and the second concave portion are The present invention is characterized in that the arrangement is alternately arranged in a staggered manner with respect to the wiring direction of the core wires .

  The invention of claim 2 is characterized in that, in the invention of claim 1, the convex part and the concave part are provided only in the barrel piece.

  The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the protrusion and the recess are in the form of a line extending in a direction intersecting the wiring direction of the core wire. .

Invention of Claim 4 is a manufacturing method of the terminal metal fitting of any one of Claim 1 thru | or 3, Comprising: The core wire exposed in the terminal of the said electric wire is mounted in the said board | substrate part, and the said state in the state caulking the both barrel pieces from the outside to the core wire, at the same time as the caulking operation, or after the caulking operation, banging outer surface of said barrel piece, the outer surface of the barrel piece, the recess recessed in the inner surface side While forming, the said convex part which protrudes in the said core line side is formed in the position of the said recessed part and back-to-back position in the inner surface of the said barrel piece.

<Invention of Claim 1>
Since the convex part which protrudes in the core wire side is provided in the inner surface of the barrel piece, the retention strength to the core wire of a barrel piece can be raised, and the improvement of the connection reliability of a terminal metal fitting and an electric wire can be aimed at. In addition, a concave portion is provided on the outer surface of the barrel piece, and a convex portion is provided at a position that is back to back with the concave portion on the inner surface of the barrel piece, so that only a concave portion that reduces the plate thickness is provided on the barrel piece. The strength of the barrel piece is ensured.

<Invention of Claim 2>
Since the convex portion and the concave portion are provided only in the barrel piece, that is, efficiently provided in a portion having a high crimping force to the core wire, the configuration is not complicated more than necessary.

<Invention of Claim 3>
Since the convex portion and the concave portion have a shape of a line extending in a direction intersecting with the wiring direction of the core wire, the holding force to the core wire is further enhanced.

<Invention of Claim 4>
Since the convex portion and the concave portion are formed at the same time as the caulking operation or after the caulking operation, the barrel piece in the crimped state is prevented from being opened and deformed by the spring back.

< Reference Example 1>
Reference Example 1 will be described with reference to FIGS. 1 and 2. The terminal fitting 10 according to the reference example 1 is connected to the terminal of the electric wire 90, and is accommodated in a connector housing (not shown) and fitted with a mating connector (not shown) in that state, thereby a mating terminal (not shown). Is connected to the continuity. The terminal fitting 10 includes a strip-like substrate portion 11 which is integrally formed by punching a conductive metal plate made of copper or a copper alloy into a predetermined shape and then bending, and extends over the entire length in the front-rear direction. ing.

  A connecting portion 12 that receives the mating terminal and is electrically connected to the mating terminal is provided at the front end of the substrate portion 11 by bending it into a rectangular tube shape. Further, a pair of open barrel-shaped holding pieces 13 that are crimped from the outside to the covering 91 at the end of the electric wire 90 on both side edges (both end edges in the width direction orthogonal to the extending direction) of the rear end portion of the substrate portion 11. Projecting outward. The two holding pieces 13 are bent along the outer peripheral surface of the covering 91 of the electric wire 90 after being crimped, and are arranged with their tips abutted at the substantially central portion in the width direction of the substrate portion 11 as shown in FIG. ing. Furthermore, a pair of open barrels that are crimped from the outside to the core wire 92 exposed at the end of the electric wire 90 between the connection portion 12 and both holding pieces 13 in the front-rear direction on both side edges of the substrate portion 11. A barrel piece 14 is provided protruding outward. Both barrel pieces 14 are crimped so as to penetrate deeply into the substantially central portion in the width direction of the core wire 92 of the electric wire 90, and after crimping, the barrel pieces 14 are curved and arranged with their tips butted against the substantially central portion in the width direction of the substrate portion 11. Has been.

  The electric wire 90 is arranged in the length direction (front-rear direction) of the substrate portion 11, and includes a core wire 92 in which strands made of aluminum or an aluminum alloy are twisted together, and a covering 91 made of an insulating resin covering the periphery of the core wire 92. It is configured.

  As shown in FIG. 1, a plurality of concave portions 15 are provided on the outer surfaces of the barrel pieces 14. Each concave portion 15 is a line extending in the width direction and has a V-shaped cross section, and is arranged in parallel with each other and in a straight line across both barrel pieces 14 as shown in FIG. In addition, a plurality of convex portions 16 projecting toward the core wire 92 are provided on the inner surfaces of both barrel pieces 14 at a position back to back with the concave portion 15. Each convex part 16 is a line extending in the width direction, has a V-shaped cross section, is arranged in parallel with each other and straddling both barrel pieces 14, and ends with a shape that fits each concave part 15. I am doing. For this reason, the barrel piece 14 has substantially the same thickness throughout the entire portion including the portions corresponding to the convex portions 16 and the concave portions 15. The convex portions 16 and the concave portions 15 are provided only on both barrel pieces 14, and are not provided on the connection portion 12, the substrate portion 11, and both holding pieces 13.

Next, the manufacturing method of the terminal metal fitting 10 which concerns on the reference example 1 , and its effect are demonstrated.
After stripping the covering 91 at the end of the electric wire 90 to expose the core wire 92, the electric wire 90 is placed on the upper surface of the substrate portion 11. Subsequently, the barrel pieces 14 and the holding pieces 13 are caulked by using an unillustrated jig such as an anvil and a crimper. Then, both the barrel pieces 14 are tilted inwardly, and the tip end part bites into the center part in the width direction of the core wire 92 from the outside (upper side), whereby the terminal fitting 10 and the electric wire 90 are electrically connected. Further, the outer surfaces of both barrel pieces 14 are pressed with the movement of the jig by the protrusions formed on the inner surfaces of the jigs corresponding to both barrel pieces 14, and concave portions 15 are formed on the outer surfaces of both barrel pieces 14. In addition, convex portions 16 are formed on the inner surfaces of both barrel pieces 14. And this convex part 16 bites into the surface of the core wire 92 in edge shape, and the core wire 92 is crimped | bonded firmly. In this case, even if an oxide film made of aluminum oxide is formed on the surface of the core wire 92, since the convex part 16 mechanically destroys the oxide film simultaneously with the formation of the convex part 16, Good connection reliability with the core wire 92 is ensured.

By the way, in the above case, since force in the plate thickness direction is applied to both barrel pieces 14 by the caulking operation, both barrel pieces 14 are spread, and there is a concern that the strength of the portion corresponding to the concave portion 15 is lowered. However, according to the reference example 1 , since the concave portions 15 and the convex portions 16 are provided in the back-to-back positions in both the barrel pieces 14, only the concave portions 15 that reduce the thickness of the barrel pieces 14 are provided. Compared to the above, the thickness of both barrel pieces 14 is not greatly reduced, and the protrusion 16 can keep the amount of elongation of both barrel pieces 14 small. As a result, the strength of both barrel pieces 14 is ensured appropriately.

  Moreover, since the convex part 16 and the recessed part 15 are provided only in both the barrel pieces 14, that is, efficiently provided in the site | part with the high crimping force to the core wire 92, the structure of the terminal metal fitting 10 becomes more complicated than necessary. Is avoided.

  Furthermore, since the convex part 16 and the recessed part 15 are in the shape of a line extending in a direction intersecting the wiring direction of the core wire 92, the holding force to the core wire 92 is further enhanced.

  Furthermore, since the convex portion 16 and the concave portion 15 are formed at the same time as the caulking operation, it is effectively prevented that both barrel pieces 14 crimped to the core wire 92 are opened and deformed outward by the spring back.

<Embodiment 1 >
Figure 3 shows the terminal fitting 10 according to the first embodiment. This is different from the reference example 1 in the arrangement of the convex portions 16 and the concave portions 15. That is, the concave portion 15 has a first concave portion 15A arranged parallel to each other on one of the outer surfaces of the barrel pieces 14, and has a second concave portion 15B arranged parallel to each other on the other side. Has been. The first recesses 15A and the second recesses 15B both have a shape extending linearly in the width direction, and are arranged in a staggered manner so as to be staggered in the front-rear direction. The not-shown convex portion 16 also has a first convex portion and a second convex portion at positions back to back with the first concave portion 15A and the second concave portion 15B, respectively. Others are the same as in Reference Example 1.

<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) After caulking both barrel pieces, a convex portion and a concave portion may be formed on the inner surface and the outer surface of both barrel pieces by hitting the outer surfaces of both barrel pieces, respectively.
(2) A convex part and a recessed part are arbitrary shapes, Comprising: For example, a cross-sectional angle U-shape may be formed.
(3) The number of convex portions and concave portions may be three or more.
(4) The terminal fitting may be a male terminal fitting having a male tab protruding forward.
(5) The electric wire may be a copper electric wire having a core wire obtained by twisting strands made of copper or a copper alloy.

It is a principal part fracture side view of the terminal metal fitting concerning a reference example 1. It is a principal part top view of a terminal metal fitting. 3 is a plan view of a main part of the terminal fitting according to Embodiment 1. FIG.

DESCRIPTION OF SYMBOLS 10 ... Terminal metal fitting 11 ... Board | substrate part 14 ... Barrel piece 15 ... Concave part 16 ... Convex part 90 ... Electric wire 92 ... Core wire

Claims (4)

It is a terminal fitting that includes a board portion on which an electric wire is placed and a pair of barrel pieces protruding from both sides of the board portion, and the two barrel pieces are crimped from the outside to the core wire exposed at the end of the electric wire. And
The outer surface of the barrel piece is provided with a recess recessed on the inner surface side,
On the inner surface of the barrel piece, a convex portion protruding toward the core wire side is provided at a position back to back with the concave portion ,
A plurality of the recesses extending in a direction intersecting with the wiring direction of the core wire, and a plurality of first recesses arranged at intervals in the wiring direction of the core wire in one barrel piece of the both barrel pieces; A plurality of second recesses extending in a direction crossing the wiring direction and arranged at intervals in the wiring direction of the core wire in the other barrel piece of the two barrel pieces; It consists of a first convex part and a second convex part, which are arranged in a back-to-back position with each of the concave part and the second concave part,
The terminal fitting, wherein the first recesses and the second recesses are alternately arranged in a staggered manner in the wiring direction of the core wire .   The terminal fitting according to claim 1, wherein the convex portion and the concave portion are provided only on the barrel piece.   The terminal fitting according to claim 1, wherein the convex portion and the concave portion have a shape of a line extending in a direction intersecting with a wiring direction of the core wire. It is a manufacturing method of the terminal metal fitting according to any one of claims 1 to 3 ,
On the board portion, the core wire exposed at the end of the electric wire is placed, and in this state, the barrel pieces are caulked from the outside, and simultaneously with the caulking operation or after the caulking operation, banging an outer surface of the barrel piece, the outer surface of the barrel piece, thereby forming the recess recessed in the inner surface side, the back-to-back position and the recess in the inner surface of said barrel piece, said protrusion protruding to the core wire side A method for manufacturing a terminal fitting, comprising: forming a terminal fitting.

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