JP5077150B2 - Terminal fitting - Google Patents

Description

  The present invention relates to a terminal fitting.

Patent Document 1 discloses a terminal fitting including an electric wire crimping portion for connecting electric wires by crimping. In this terminal fitting, a structure is adopted in which a groove is formed in the contact surface of the electric wire crimping portion with the conductor of the electric wire, and the groove is hooked on the outer periphery of the conductor, thereby increasing the fixing force between the electric wire crimping portion and the conductor. .
JP 2005-222815 A

In said terminal metal fitting, since the depth of a groove | channel is limited in the range of the plate | board thickness of an electric wire crimping part, the latching allowance with the conductor in a groove | channel is small. Therefore, when the plate | board thickness of an electric wire crimping part is thin, sufficient adhering force may not be acquired.
This invention is completed based on the above situations, Comprising: It aims at improving the adhesive force of an electric wire crimping part and the conductor of an electric wire.

  As means for achieving the above object, the invention of claim 1 is a terminal fitting having an open barrel-shaped wire crimping portion for connecting a conductor of a wire by crimping, and the wire crimping portion includes the wire A fixing wall in which a part of the crimping part is displaced to the conductor side, and an end edge part of the fixing wall and the wire crimping part are connected in a step shape, and the wire crimping part and the fixing It is characterized in that a locking portion thicker than the wall is formed.

  The invention of claim 2 is characterized in that, in the invention described in claim 1, the fixing wall is formed with a biting portion protruding in a rib shape toward the conductor.

<Invention of Claim 1>
In a state where the conductor is crimped to the electric wire crimping portion, the step-shaped locking portion is hooked on the conductor, thereby improving the fixing force between the conductor and the electric wire crimping portion. Even if the tightening force when crimping the conductor is large, the locking portion having a large thickness is difficult to deform, so that the locking allowance with the conductor in the locking portion does not decrease.

<Invention of Claim 2>
Since the biting portion is locked so as to bite into the outer periphery of the conductor, the fixing force is further improved.

<Embodiment 1>
A first embodiment of the present invention will be described below with reference to FIGS. The terminal fitting 10 of the present embodiment is a female shape formed by bending a metal plate material 10P punched into a predetermined shape, and the front end side portion is a terminal connection portion 11 having a rectangular tube shape. ing. The terminal connecting portion 11 has a well-known configuration that functions as a connecting means with a long and thin tab (not shown) of a male mating terminal.

  The rear end portion of the terminal fitting 10 is an open barrel-shaped wire crimping portion 12. A front end portion of the electric wire 30 is connected to the electric wire crimping portion 12 by crimping. The electric wire 30 includes a conductor 31 made of a stranded wire obtained by twisting a plurality of fine metal wires, and an insulating coating 32 surrounding the conductor 31. At the front end portion of the electric wire 30, the front end portion of the conductor 31 is exposed by removing the insulating coating 32 in advance as preparation for connection to the terminal fitting 10. In addition, as a material of the conductor 31, copper, a material (for example, aluminum) whose rigidity is higher than copper, or a material (for example, aluminum) whose electrical conductivity is lower than copper is used.

  The front end portion of the wire crimping portion 12 is a wire barrel portion 13 to which the conductor 31 is connected, and the rear end portion of the wire crimping portion 12 is an insulating coating 32 that surrounds the conductor 31 in the front end portion of the wire 30. Insulation barrel part 14 to which the remaining part is connected is formed. The wire barrel portion 13 has a form in which a pair of symmetrical crimping pieces 16 are extended from the left and right side edges of the bottom plate portion 15. The electric wire 30 crimped to the wire barrel portion 13 is surrounded and pressurized by the bottom plate portion 15 and the pair of caulking pieces 16 and is pressed against the wire barrel portion 13 by the fixing force generated by the pressurization. It is fixed so that conduction is possible.

  In the crimped state, the front end portion of the conductor 31 is positioned so as to protrude further forward than the front end edge of the crimping piece 16. A tightening region 17 to be tightened by a crimper (not shown) of the applicator in the front-rear direction of the wire barrel (crimping piece 16) is limited to a range excluding both front and rear ends of the crimping piece 16, and the tightening region 17 The front edge and the rear edge of the bell mouth 18 are inclined (tapered) so as to be slightly larger in diameter than the tightening region 17. Since the bell mouth 18 is formed by limiting the tightening region 17 as described above, the edges of the front end edge and the rear end edge in the inner periphery of the crimping piece 16 do not cut the fine metal wire constituting the conductor 31. .

  The wire barrel portion 13 is formed with a fixing wall 20 and a locking portion 21. The fixed wall 20 has a configuration in which a portion of the wire barrel portion 13 within the range of the tightening region 17 in the front-rear direction is displaced toward the conductor 31 (inner peripheral surface). In the state of the flat metal plate 10P before bending, the fixed wall 20 is parallel to a region other than the fixed wall 20 in the wire barrel portion 13 (hereinafter referred to as a non-fixed portion 22). The formation region of the fixing wall 20 in the left-right direction (circumferential direction in the crimped state) includes the bottom plate portion 15 from the position inside the rising end of the one crimping piece 16 (on the bottom plate portion 15 side), and the other crimping piece. 16 is a range extending to a position on the inner side (bottom plate portion 15 side) from the rising edge of 16. The fixed wall 20 has a square shape. Further, the plate thickness dimension Ta of the fixed wall 20 is constant over the entire region, and is the same as the plate thickness Tb of the non-fixed portion 22.

  The locking portion 21 is a form in which the front and rear end edges of the fixing wall 20 and the non-fixing portion 22 and the right and left end edge edges of the fixing wall 20 and the fixing portion are connected in a stepped shape. A rectangular frame shape that is continuous over the entire circumference of the fixing wall 20 is formed. The plate thickness dimension Tc of the locking portion 21 is thicker than the plate thicknesses Ta and Tb of the fixed wall 20 and the non-fixed portion 22. The plate thickness Tc of the locking portion 21 is smaller than twice the plate thickness Ta of the fixing wall 20, but may be larger than twice the plate thickness Ta of the fixing wall 20. Further, the inner surface of the locking portion 21 (the surface facing the conductor 31) is continuous with the inner surface of the fixing wall 20 (the contact surface with the conductor 31), and the outer surface of the locking portion 21 is the non-fixing portion 22. It is connected to the outer surface of the same surface. Further, the locking portion 21 is located within the range of the tightening region 17 in the front-rear direction.

  In a state where the conductor 31 is crimped to the wire barrel portion 13, the inner surface of the fixing wall 20 and the inner surface of the locking portion 21 are in close contact with the outer periphery of the conductor 31, and the inner surface of the non-fixing portion 22 is near the locking portion 21. The rectangular frame region is not in contact with the conductor 31. Similarly, in the crimped state, the edge-shaped corner edge on the inner surface side of the locking portion 21 bites into the outer periphery of the conductor 31, and this biting action causes the conductor 31 and the wire barrel portion 13 to be in the radial direction. A large locking allowance is secured between them. Thereby, the fixing force of the front-back direction between the wire barrel part 13 and the conductor 31 is heightened.

  Even if the tightening force when crimping the conductor 31 is set large, the locking portion 21 having a large thickness is not easily crushed and deformed, so that the locking allowance with the conductor 31 in the locking portion 21 is reduced. Absent. In addition, even if the fixing wall 20 is deformed so as to bend outward between the locking portions 21 by the reaction force from the conductor 31 side, the thick locking portion 21 hardly deforms. Therefore, there is no possibility that the locking margin between the conductor 31 and the locking portion 21 is reduced.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. In the terminal fitting 40 of the second embodiment, the fixing wall 43 formed in the wire barrel portion 42 of the electric wire crimping portion 41 is 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 wire barrel portion 42 of the second embodiment is formed with a fixing wall 43 and a locking portion 44 similar to those of the first embodiment, and the fixing wall 43 is formed with a biting portion 45 protruding toward the conductor 31 side. ing. The biting portion 45 is formed by pressing the fixed wall 43 so as to knock it out from the outer surface side. The biting portion 45 extends in a circumferential direction intersecting the axis of the conductor 31 (a direction parallel to the rising direction of the caulking piece 16 from the bottom plate portion 15), and a plurality of the biting portions 45 are arranged in parallel at intervals in the front-rear direction. . The cross-sectional shape of each biting portion 45 is substantially triangular. In a state where the conductor 31 of the electric wire 30 is crimped to the wire barrel portion 42, the biting portion 45 bites into the outer periphery of the conductor 31, thereby exhibiting a high fixing force.

<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 the said embodiment, although the formation area of the adhering wall was made into the range inside the outer edge part of an electric wire crimping | compression-bonding part, according to this invention, the formation area of an adhering wall reaches the outer edge part of an electric wire crimping part. Also good.
(2) In the above embodiment, one fixing wall is formed in the electric wire crimping portion. However, according to the present invention, a plurality of fixing walls may be formed in one electric wire crimping portion.
(3) Although the above embodiment has been described with reference to an example applied to a female terminal fitting, the present invention can also be applied to a male terminal fitting.

The side view showing the state which crimped the electric wire to the terminal metal fitting in Embodiment 1. Plan view showing the state where wires are crimped to terminal fittings Plan view showing the shape of the wire crimping part of the metal plate XX sectional view of FIG. The top view showing the shape of the electric wire crimping | compression-bonding part of the metal plate material of Embodiment 2. YY sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Terminal metal fitting 12 ... Wire crimping part 20 ... Adhering wall 21 ... Locking part 30 ... Electric wire 31 ... Conductor 40 ... Terminal metal fitting 42 ... Electric wire crimping part 43 ... Adhering wall 44 ... Locking part 45 ... Biting-in part

Claims (2)

In the terminal fitting having an open barrel-shaped wire crimping part for connecting the conductor of the wire by crimping,
In the wire crimping part,
A fixing wall in a form in which a part of the wire crimping portion is displaced toward the conductor;
It is a form which connects the edge part of the above-mentioned fixed wall and the above-mentioned electric wire crimping part in the shape of a level difference, and is characterized by forming the above-mentioned electric wire crimping part and the locking part thicker than the above-mentioned fixed wall. Terminal fitting to be used.   2. The terminal fitting according to claim 1, wherein a biting portion protruding in a rib shape toward the conductor side is formed on the fixing wall.

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