JP2010062027A - Terminal fitting, and method of connecting wire to terminal fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a core wire part from protruding to the front of a wire barrel. <P>SOLUTION: A projecting part 11 having a height projecting inward from the height position of the general surface of a bottom surface part 8 is formed on the bottom surface part 8 at a rear part of a wire barrel 4. This projecting part 11 can curve and deform the middle portion in the longitudinal direction of the core wire part 6 with the state that the core wire part 6 exposed to the end portion of a wire W is caulked by the wire barrel 4. The front end position of the core wire part 6 is retreated as much as the core wire part 6 is curved, and its protrusion from the wire barrel 4 can be avoided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a terminal fitting and a method for connecting an electric wire to the terminal fitting.

Conventionally, with respect to the connection between the electric wire and the terminal fitting, the connection with the core wire portion (twisted wire) is performed by caulking the wire barrel portion, and the connection with the covering portion is performed by caulking the insulation barrel portion. In that case, the strands of the core wire portion may protrude from the front portion of the wire barrel portion and be scattered. The following Patent Document 1 is known as a countermeasure. In this device, the core wire portion is joined to the terminal fitting by welding. In addition, a pair of guide walls are provided in the width direction in front of the portion where the core wire portion is welded in the terminal fitting, and the tip of the core wire portion is passed through the slit formed between the two guide walls. In this way, “breaking” of the core wire portion is prevented.
Japanese Patent Laid-Open No. 10-149843

  However, in the case of the above structure, in addition to a portion where the core wire portion and the terminal fitting are connected (joining by welding), a portion (a pair for forming a guide wall and a guide wall) that converges the core wire portion at the front portion thereof. Therefore, the terminal fitting may be enlarged in the length direction.

  This invention was completed based on the above situations, and provides the connection method with the terminal metal fitting and electric wire which can suppress the enlargement of a terminal metal fitting, preventing the dispersion | distribution of a core wire part. For the purpose.

  As means for achieving the above-mentioned object, the invention of claim 1 is characterized in that the height of the general surface of these bottom surface portions is set at the middle portion in the length direction of the bottom surface portion of the wire barrel or the bottom surface portion behind the wire barrel. A protrusion having a height that protrudes inward from the vertical position is formed, and the protrusion is the length of the core wire portion with the core wire portion exposed at the tip of the electric wire being caulked by the wire barrel. It is characterized by a configuration in which a midway portion in the direction is bent and deformed.

  According to a second aspect of the present invention, in the one according to the first aspect, an insulation barrel for caulking the covering portion of the electric wire is provided behind the wire barrel in the length direction, and the wire barrel and Between the insulation barrels, a barrel connecting portion formed narrower than these two portions is formed in a deployed state of the terminal fitting, and the protruding portion extends along the width direction in the barrel connecting portion. It is characterized in that it can be bent in the length direction of the terminal fitting by being formed to protrude in a U shape to the side.

  According to the invention of claim 3, a protruding portion having a height protruding inward from the height position of the general surface of the bottom surface portion is formed on the bottom surface portion inside or behind the wire barrel in the terminal fitting. The caulking by the wire barrel is performed in a state where the intermediate portion of the core wire portion is curved by the protruding portion.

<Inventions of Claims 1 and 3>
According to the first and third aspects of the invention, in a state where the core wire portion of the electric wire is caulked by the wire barrel, the core wire portion is curved and deformed in the middle of the length direction by being pushed up at the tip of the protrusion portion. Therefore, compared with the case where the core wire portion is not deformed by bending, the tip position of the core wire portion can be retracted by the amount detoured by the curve deformation. Therefore, it is possible to effectively alleviate the situation where the core wire portion protrudes forward from the wire barrel. Moreover, since only a protrusion part is formed, the enlargement of a terminal metal fitting can also be avoided.

<Invention of Claim 2>
According to the invention of claim 2, since the barrel connecting portion is formed between the insulation barrel and the wire barrel and the protruding portion is formed here, even if both barrels are deformed during caulking, the protruding portion The influence can be made difficult.

  The following effects can also be obtained. For example, when the core portion is made of aluminum, it is necessary to break the oxide film on the surface, so that the caulking force with the wire barrel is higher than that of a normal copper electric wire. Then, the crimped terminal fitting may be stretched, and the positional relationship between the terminal fitting and the cavity may be deviated from the normal positional relationship. In such a case, if the protruding portion is formed in a U shape, even if the terminal fitting is stretched due to caulking, the stretching can be absorbed in the protruding portion. Therefore, the positional relationship between the terminal fitting and the cavity can be maintained in a regular relationship.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a copper female terminal fitting. In the front half, a terminal connection portion 2 for connection with a male terminal fitting (not shown) is provided in a square tube shape. A barrel portion 3 for connection with the electric wire W is formed behind the terminal connection portion 2. The barrel portion 3 includes a wire barrel 4 for caulking the core wire portion 6 exposed at the tip end portion of the electric wire W, an insulation barrel 5 for caulking the covering portion 7 of the electric wire W, and between the barrels 4 and 5. It consists of the connecting part 9 between the barrels to be connected. The core wire portion 6 of the electric wire W used in this embodiment is formed by twisting a large number of strands made of an aluminum alloy.

  FIG. 2 shows a state when the second half of the terminal fitting 1 is unfolded. The wire barrel 4 is formed by symmetrically projecting a pair of wire barrel pieces 4 </ b> A outward from each other in the width direction (vertical direction in FIG. 2) from both side edges of the bottom surface of the terminal fitting 1. In this embodiment, both wire barrel pieces 4A are formed in a rectangular shape that is long in the front-rear direction (left-right direction in FIG. 2), and is formed with a substantially uniform overhanging length over the entire length.

  The insulation barrel 5 is formed by a pair of insulation barrel pieces 5A projecting outward in the width direction from both side edges of the bottom surface portion 8 at the rear end portion of the terminal fitting 1. The protruding length in the width direction of both insulation barrel pieces 5A is longer than that of the wire barrel pieces 4A, and is formed uniformly over the entire length.

  The inter-barrel connecting portion 9 is formed such that the width dimension gradually increases from the rear end of the wire barrel 4 toward the rear (direction toward the insulation barrel 5) (even if formed with the same width dimension). Good). Cuts 10 are made inwardly at the four corners of the connecting part 9 between the barrels, that is, at each corner of the part connecting to the wire barrel 4 and the insulation barrel 5. This alleviates the influence of deformation caused by caulking on the wire barrel 4 and the insulation barrel 5 to the inter-barrel connecting portion 9.

  A projecting portion 11 is formed over the entire width of the central portion of the connecting portion 9 between the barrels in the length direction. As shown in FIG. 1, the protruding portion 11 is formed so as to protrude in an approximately U shape from the outer surface of the inter-barrel connecting portion 9 inward. In a state before the wire barrel 4 is caulked with respect to the core wire portion 6 of the electric wire W, a gap S is held in the length direction inside the protruding portion 11, and the protruding portion 11 is thus a terminal fitting. The elongation allowance for absorbing the elongation in the length direction of 1 is retained. Further, the position where the protruding portion 11 is provided in the length direction is slightly forward from the front end surface of the covering portion 7 in the middle of the length direction of the core wire portion 6 when the electric wire W is set to the terminal fitting 1 for caulking work. As far away as possible. In other words, when caulking is performed, the core wire portion 6 is separated from the front end of the covering portion 7 to the extent that the core wire portion 6 can be bent before and after sandwiching the protruding portion 11. Further, the height at which the protruding portion 11 protrudes from the general surface of the bottom surface portion 8 in the inter-barrel connecting portion 9 is such that the lower edge of the core wire portion 6 can be pushed up with at least the insulation barrel 5 being caulked. Is set.

  The present embodiment is configured as described above. When the electric wire W is connected to the terminal fitting 1, the electric wire W with the tip end peeled is set in a predetermined position in the terminal fitting 1. In that case, as shown in FIG. 3, the front end of the covering portion 7 is positioned slightly apart behind the protruding portion 11. At this time, the front end position of the core wire portion 6 is substantially aligned with the front end position of the wire barrel 4. In a state before caulking, the protruding portion 11 is supported in a contact state at a position near the base portion of the core wire portion 6.

  After the electric wire W is set to the terminal fitting 1, the caulking process of the wire barrel 4 to the core wire part 6 and the caulking process of the insulation barrel 5 to the covering part 7 are performed at the same time (even if the timing is shifted). Good). When the both barrels 4 and 5 are caulked, the insulation barrel 5 is crimped so that both the insulation barrel pieces 5A are wound around the outer peripheral surface of the covering portion 7, and the covering portion 7 is compressed. Held in a state. On the other hand, in the wire barrel 4, the tips of both wire barrel pieces 4 </ b> A are strongly caulked so as to bite into the core wire portion 6.

  As the caulking progresses in both barrels 4 and 5, a pressing force acts on the core wire portion 6 before and after the protruding portion 11 is sandwiched, so that the core wire portion 6 is relatively pushed up by the protruding portion 11. The portion 6 is forcibly bent and deformed with the protruding portion 11 as a vertex. As a result, the front end position of the core wire portion 6 is retracted by the amount of bending described above. Therefore, it is possible to avoid the strands of the core wire portion 6 from protruding from the front end of the wire barrel 4.

  In particular, when an aluminum electric wire is used as in the present embodiment, as described above, a stronger caulking force is applied as compared with a copper electric wire because it is necessary to break the oxide film. If the strand protrudes from the front end of the wire barrel 4, the protruding portion is spread so that the tip end side is expanded. In this case, normally, the rear end portion of the terminal connection portion 2 must be secured as a space where the retaining portion of the retainer enters. However, if there are scattered wires in this space, the retainer is retained. There is a concern that the approach of the part will be hindered. In this respect, according to the present embodiment, the core wire portion 6 is retracted so as not to protrude from the front end of the wire barrel 4, so that the retainer function can be maintained particularly when an aluminum electric wire is used. And so on.

  Further, as a strong caulking force is applied to the wire barrel 4, the wire barrel 4 is stretched. Since the gap S held in the protruding portion 11 absorbs this elongation, when the terminal fitting 1 is inserted into the cavity of the connector housing, the positional relationship set in advance between the terminal fitting 1 and the cavity is maintained. A situation that causes a shift can also be avoided.

  Furthermore, in this embodiment, since the cuts 10 are made in the four corners of the connecting portion 9 between the barrels so as not to be affected by the caulking deformation of both barrels, the protruding portion 11 can be maintained in the initial shape as much as possible. .

  As described above, according to the present embodiment, since the core wire portion 6 can be forcibly deformed by caulking by forming the protruding portion 11, the strands of the core wire portion 6 are formed on the wire barrel 4. It is possible to avoid a situation where it protrudes from the front end. Since such a function is exhibited only by forming the protruding portion 11 slightly, the terminal fitting 1 is not enlarged. In addition, the extension of the terminal fitting 1 generated by caulking can be absorbed by the protruding portion 11.

<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 this embodiment, although the protrusion part 11 was formed in the site | part behind the wire barrel 4, it is also possible to form in the inner area | region of the wire barrel 4. FIG.

  (2) In the present embodiment, the protruding portion 11 is formed in a U-shape so that the terminal fitting 1 can be stretched and absorbed. However, even if the protruding portion 11 is formed in a flat plate shape from the bottom surface of the terminal fitting 1. Alternatively, a flat plate-like separate member may be fixed by welding or the like.

  (3) Although the case where the present invention is applied to the female terminal fitting 1 is shown in the drawing, the present invention can also be applied to the male terminal fitting.

  (4) In this embodiment, although the example applied to the aluminum electric wire was shown, you may apply to a normal copper electric wire.

Broken view showing the second half of the terminal fitting broken away Exploded view of the latter half of the terminal fitting Broken view showing the latter half of the terminal fitting before caulking Broken view showing the latter half of the terminal fitting after caulking VV line sectional view in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Female terminal metal fitting 4 ... Wire barrel 6 ... Core wire part 7 ... Cover part 8 ... Bottom part 9 ... Inter-barrel connection part 11 ... Protrusion part

Claims (3)

A protruding portion having a height protruding inward from the height position of the general surface of the bottom surface portion is formed in the middle portion in the length direction of the bottom surface portion of the wire barrel or on the bottom surface portion behind the wire barrel. With
The projecting portion is a terminal fitting characterized by bending and deforming a portion in the length direction of the core wire portion in a state where the core wire portion exposed at the tip of the electric wire is caulked by the wire barrel. An insulation barrel for caulking the covering portion of the electric wire is provided at the rear of the wire barrel in the length direction, and a terminal fitting is in an expanded state between the wire barrel and the insulation barrel. A barrel connecting portion formed to be narrower than these two portions is formed, and the protruding portion is formed to protrude in a U shape toward the electric wire side along the width direction in the barrel connecting portion, thereby forming a terminal. The terminal fitting according to claim 1, wherein the terminal fitting can be bent in a length direction of the fitting. A projecting portion having a height projecting inwardly from the height position of the general surface of the bottom surface portion is formed on the bottom surface portion inside or behind the wire barrel of the terminal fitting, and the core portion A method for connecting an electric wire to a terminal fitting, wherein caulking is performed by the wire barrel in a state where a midway portion in the length direction is curved by the protruding portion.

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