JP2010080189A - Terminal fitting and electric wire with terminal fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal fitting restrained from elongation, and to provide an electric wire having the same. <P>SOLUTION: A surface, abutting on a core wire 21, out of a bottom plate part 48 of the terminal fitting is formed with a twin-supported elastic deformation part 50 whose both ends along the axial direction of the core wire 21 are connected to the bottom plate part 48. Force for seeking to push back the core wire 21 to the wire barrel part 47, 47 side is thereby applied by the elastic deformation part 50 in addition to force for pressing the core wire 21 to the bottom plate 48 side by the wire barrel parts 47, 47. The forces for pressing the core wire 21 from the mutually opposite sides are applied to obtain the force for holding the core wire 21 more strongly between the wire barrel parts 47, 47 and the bottom plate part 48. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a terminal fitting and an electric wire with terminal fitting.

When the terminal fitting is attached to the covered electric wire, the exposed core wire of the covered electric wire is crimped and connected to the terminal fitting (see Patent Document 1).
Here, when crimping the core wire to the terminal fitting, for example, an open barrel type terminal fitting having a pair of barrels raised from the side edge of the bottom plate portion is placed on the anvil, and the core wire is attached to the bottom plate portion. Address. When the crimper arranged above the terminal fitting is lowered, the barrel portion is gradually deformed so as to wrap the core wire, and the tip of the barrel portion is pressed into the core wire so that the core wire is crushed. .
JP 2007-12341 A

By the way, if the force to crimp the barrel part and the core wire is weak, the core wire is not crimped with a strong force, so the core wire is not firmly held by the terminal fitting (the holding force is weak), and the core wire is disconnected or misaligned. There is a concern to cause.
On the other hand, when crimping with a strong force, the core wire is crushed and a strong force is applied to the bottom plate portion below the core wire. At this time, the bottom plate portion is crushed and stretched in the axial direction of the core wire, which may cause stretching of the terminal fitting as a whole.
Due to the extension of the terminal fitting, when the terminal fitting is accommodated in a cavity such as a connector, there is a concern that the terminal fitting protrudes from the cavity.

  This invention was completed based on the above situations, Comprising: It aims at providing the electric wire with a terminal metal fitting and a terminal metal fitting which can ensure electric wire holding power, suppressing the extension of a terminal metal fitting. To do.

The terminal fitting according to the present invention is provided integrally with the electric wire connecting portion to which an electric wire is connected and the electric wire connecting portion, and is aligned with the electric wire connecting portion along the axial direction of the electric wire and connected to the counterpart terminal portion. A terminal connection part,
The electric wire connecting portion has a bottom plate portion on which the core wire of the electric wire is placed, and barrel portions extended from both side portions of the bottom plate portion,
The surface of the bottom plate portion that is in contact with the core wire is deformed by receiving pressure when the core wire is crimped, and an elastically deforming portion that exerts an elastic force on the core wire after the core wire is crimped is an axis of the core wire. It is characterized in that both end portions along the direction are formed in a doubly supported shape connected to the bottom plate portion (means 1).

According to the means 1, not only the force that the barrel portion presses the core wire toward the bottom plate portion, but also the force that pushes the core wire back toward the barrel portion by the elastic deformation portion is given. By applying a force for pressing the core wires from opposite directions, it is possible to obtain a stronger force for holding the core wire between the barrel portion and the bottom plate portion.
That is, even if the force that the barrel portion presses the core wire during the crimping is slightly weakened, the elastic deformation portion can secure the electric wire holding force, thereby suppressing the extension of the terminal fitting due to the crimping with a strong force. be able to.
In addition, since the elastically deforming part is a cantilevered shape, both ends of the elastically deforming part are supported by the bottom plate part, so that the load from the elastically deforming part is distributed in two places compared to the cantilevered form. In addition, the elastic force generated at two locations can be applied to the core wire side.

The means 1 may include a holding means for holding the electric wire by caulking a pair of caulking pieces from above the insulating coating of the electric wire (means 2).
If it does in this way, an electric wire can be held reliably rather than holding an electric wire only by a barrel part.

  It is good also as an electric wire with a terminal metal fitting which mounts the core wire which the covered electric wire exposed to the said baseplate part of the terminal metal fitting of the means 1 or the means 2, and crimps | bonds so that the said core wire may be wrapped by the said barrel part (means 3).

The terminal fitting according to the present invention is provided integrally with the electric wire connecting portion to which an electric wire is connected and the electric wire connecting portion, and is aligned with the electric wire connecting portion along the axial direction of the electric wire and connected to the counterpart terminal portion. A terminal connection part,
The electric wire connecting portion has a bottom plate portion on which the core wire of the electric wire is placed, and barrel portions extended from both side portions of the bottom plate portion,
The surface of the bottom plate that is in contact with the core wire is deformed by pressure when the core wire is crimped, and an elastic deformation portion that exerts an elastic force on the core wire after the core wire is crimped is an axis of the core wire. It is characterized in that both end portions in a direction orthogonal to the direction are formed in a cantilever shape continuous with the bottom plate portion (means 4).

According to the means 4, not only the force that the barrel portion presses the core wire toward the bottom plate portion but also the force that tries to push the core wire back toward the barrel portion by the elastic deformation portion. By applying a force for pressing the core wires from opposite directions, it is possible to obtain a stronger force for holding the core wire between the barrel portion and the bottom plate portion.
That is, even if the force that the barrel portion presses the core wire is slightly weakened during crimping, the core wire can be held by the force from the elastically deformable portion. The wire holding force can be secured while suppressing the elongation.
In addition, since the elastically deforming part is a cantilevered shape, both ends of the elastically deforming part are supported by the bottom plate part, so that the load from the elastically deforming part is distributed in two places compared to the cantilevered form. In addition, the elastic force generated at two locations can be applied to the core wire side.

The means 4 may include a holding means for holding the electric wire by caulking a pair of caulking pieces from above the insulating coating of the electric wire (means 5).
If it does in this way, an electric wire can be certainly held rather than holding an electric wire only with a barrel part.

  It is good also as an electric wire with a terminal metal fitting which places the core wire which the covered electric wire exposed on the said baseplate part of the terminal metal fitting of the means 4 or the means 5, and crimps | bonds so that the said core wire may be wrapped by the said barrel part (means 6).

  According to this configuration, it is possible to ensure the electric wire holding force while suppressing the elongation of the terminal fitting.

<Embodiment 1>
Hereinafter, the electric wire 10 with a terminal metal fitting of Embodiment 1 which actualized this invention is demonstrated with reference to FIGS.
As shown in FIG. 1, the electric wire 10 with terminal metal fittings of the first embodiment has a terminal metal fitting 30 connected by crimping to the terminal portion of the covered electric wire 20. The device is routed between devices (not shown) such as a motor. Note that the left side of FIG. 1 is assumed to be the front and the right side is assumed to be the rear.

  The covered electric wire 20 is obtained by covering a core wire 21 formed by spirally twisting a plurality of metal strands 21A made of an aluminum alloy with a resin insulating coating 22 (insulating layer). The insulation coating 22 is peeled off and the core wire 21 is exposed. In addition to the aluminum alloy, the core wire 21 may be an aluminum wire or other types of metal wires.

The terminal fitting 30 is a so-called open barrel type, and includes a box-shaped terminal connection portion 31 and a wire connection portion 40 that is continuous with the terminal connection portion 31 and to which the covered electric wire 20 is connected. Is made of a copper alloy.
The terminal connection portion 31 is a box-shaped female terminal, is provided integrally with the wire connection portion 40, and is aligned with the wire connection portion 40 along the axial direction of the wire 20 (the left-right direction in FIG. 1). By inserting the terminal into the insertion hole 31A, electrical connection with the counterpart terminal is achieved.

The electric wire connection portion 40 includes an insulation barrel portion 41 that holds the covered electric wire 20, and a core wire connection portion 45 that is connected to the core wire 21.
The insulation barrel portion 41 (corresponding to the “holding means” of the present invention) has a pair of caulking pieces 41A and 41A raised from the left and right side edges of the bottom plate continuous from the core wire connection portion 45. By curving the pieces 41A and 41A toward the core wire 21, the covered electric wire 20 is held so as not to be detached or displaced.

As shown in FIG. 2, the core wire connecting portion 45 includes a semicircular bottom plate portion 48 and a pair of wire barrel portions 47 and 47 extending upward from both side portions of the bottom plate portion 48 (the “barrel” of the present invention). Part)).
The wire barrel portions 47 and 47 are both rectangular and extend from both side portions of the bottom plate portion 48 in the width direction.

  The bottom plate portion 48 has a U-shaped shape with a convex lower side, and a top-end is provided with a double-sided elastic deformation portion 50 that protrudes upward before pressure bonding. In addition, although mentioned later in detail, the surface of the elastic deformation part 50 and the surface of the baseplate part 48 become substantially flush with the elastic deformation of the elastic deformation part 50 after pressure bonding.

  The elastically deforming portion 50 is formed so as to protrude from the central portion in the width direction of the upper surface 48A of the bottom plate portion 48, and is long in the axial direction of the core wire 21 (the same as the axial direction of the electric wire 20; Both end portions along the axial direction are formed in a cantilever shape that continues to the bottom plate portion 48. The length in the axial direction of the elastic deformation portion 50 is a portion corresponding to the wire barrel portions 47 and 47 in the bottom plate portion 48, that is, a portion of the bottom plate portion 48 from the substantially front end portion 47 </ b> A of the wire barrel portions 47 and 47 to the rear end. It is formed at a position over the portion 47B (see FIG. 3).

  The shape of the elastic deformation portion 50 is such that the end portions in the front-rear direction (both end portions along the axial direction of the core wire 21) are connected to the bottom plate portion 48 that is flat (flat in the axial direction). A double-supported shape (cross-linked shape) whose height increases in the direction toward the center of the deformable portion 50 is formed. The cross section of the elastic deformation portion 50 is rectangular, and the thickness in the vertical direction is substantially the same as the thickness of the bottom plate portion 48. However, both ends of the elastic deformation portion 50 are the same as those of the elastic deformation portion 50 described later. Since it is stretched during formation, the thickness is slightly reduced. Note that, depending on the processing method, the entire elastic deformation portion can be thinned to give the entire elastic deformation portion an elastic force. The elastic deformation portion 50 exhibits an elastic repulsion force on the side where the core wire 21 is disposed even if it is elastically deformed until it receives pressure and has the same shape as the bottom plate portion 48.

  The elastically deformable portion 50 is formed by, for example, forming a terminal metal plate (a developed shape of the terminal metal) into a central portion in the width direction by punching a metal flat plate having a predetermined thickness by a cutting machine (not shown). Then, two parallel cut portions 52, 52 are cut along the axial direction (see FIG. 4). In FIG. 4, the cut portions 52 and 52 are formed in the developed shape (terminal metal plate) after the metal plate material is punched in the wire connection portion 40.

Next, between the two cut portions 52, 52 is pressed and deformed from the side opposite to the side on which the core wire 21 of the bottom plate portion 48 is placed (the back side of the paper in FIG. 4) by the press machine, and the elastic deformation portion 50 Is protruded in a cantilevered manner on the side of the bottom plate portion 48 on which the core wire 21 is placed (the front side in FIG. 4). In addition, by deforming the elastic deformation portion 50 to the side on which the core wire 21 is placed, an opening 61 that communicates with the top and bottom of the bottom plate portion 48 is left (see FIG. 3).
As a result, the molded elastic deformation portion 50 is elastically deformed downward when pressure is applied when the core wire 21 is crimped, and exerts an elastic force on the core wire 21 even after the core wire 21 is crimped. Note that, after the crimping, the opening 61 is almost closed due to the deformation of the elastic deformation portion 50 pushed by the core wire 21.

Next, the manufacturing method of the electric wire 10 with a terminal metal fitting is demonstrated.
The exposed core wire 21 of the covered electric wire 20 is placed on the bottom plate portion 48 of the terminal fitting 30 obtained by bending the terminal original plate. Then, the terminal fitting 30 is positioned on the anvil 70 as shown in FIG.
Then, the crimper 71 disposed above the terminal fitting 30 is lowered.
Then, the wire barrel portions 47, 47 of the terminal fitting 30 are deformed into a shape that wraps the core wire 21 according to the inner surface shape of the crimper 71, and are pressed downward so as to crush the core wire 21.

Thereby, since the bottom plate part 48 and the elastic deformation part 50 are located under the core wire 21, they are pressed downward (in a direction to be crushed) together with the core wire 21. Thereby, as shown in FIG. 6, the elastic deformation part 50 elastically deforms below.
At this time, the core wire 21 receives a force compressed and pressed by caulking of the wire barrel portions 47 and 47 from above, and is biased by the elastic force of the elastic deformation portion 50 from below. ing.
Then, when the crimper 71 is lowered to a predetermined position, the crimping of the electric wire 10 with terminal fitting is finished.

As described above, in the first embodiment, not only the force that the wire barrel portions 47 and 47 (barrel portions) press the core wire 21 toward the bottom plate portion 48 side, but also the core wire 21 is placed on the wire barrel portions 47 and 47 side by the elastic deformation portion 50. The force to push back is given. By applying a force for pressing the core wire 21 from the opposite directions, a force for holding the core wire 21 between the wire barrel portions 47 and 47 and the bottom plate portion 48 more strongly can be obtained.
That is, even if the force with which the wire barrel portions 47 and 47 press the core wire 21 is slightly weakened during crimping, the elastic deformation portion 50 can secure the electric wire holding force. The elongation of the metal fitting can be suppressed.
Further, since the elastically deforming portion 50 is in a cantilever shape, both ends of the elastically deforming portion 50 are supported by the bottom plate portion 48 as compared with the cantilever shape, and the load from the elastically deforming portion 50 is reduced. In addition to the effect that it can be dispersed at two locations, the elastic force generated at two locations can be applied to the core wire 21 side, so that the core wire 21 can be held with a stronger force.

  Further, since the electric wire 20 is held by caulking the pair of caulking pieces 41A and 41A from above the insulating coating of the electric wire 20 by the insulation barrel portion 41 (holding means), the electric wire 20 is held only by the wire barrel portions 47 and 47. The electric wire 20 can be reliably held rather than held.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, about the structure same as Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.
The elastic deformation portion 50 of the first embodiment extends in the axial direction of the core wire 21, but the elastic deformation portion 150 of the second embodiment extends in a direction orthogonal to the axial direction of the core wire 21.

  The bottom plate portion 48 has a curved shape with a convex lower side, and a top-end is provided with a double-sided elastic deformation portion 150 protruding upward (see FIG. 9).

  The elastically deforming portion 150 is formed at the substantially central portion of the front end and the rear end of the barrel portions 47, 47 in the axial direction on the upper surface of the bottom plate portion 48, and is the same as the width direction of the core wire 21 (the direction orthogonal to the axial direction). ) And both end portions in the width direction are formed in a cantilever shape that is continuous with the bottom plate portion 48. The length of the elastic deformation portion 150 is formed from the base end portion of one barrel portion 47 to the base end portion of the other barrel portion 47, that is, over the entire width of the bottom plate portion 48.

  The shape of the elastic deformation portion 150 is such that the end portions in the width direction (both end portions in the direction orthogonal to the axial direction of the core wire 21) are continuous with the bottom plate portion 48 (almost flush with the surface of the bottom plate portion 48). It forms a doubly-supported shape (cross-linked shape) in which the position in the height direction increases from the portion toward the center. The cross section of the elastic deformation portion 150 is rectangular, and the thickness in the vertical direction is substantially the same as the thickness of the bottom plate portion 48. However, both ends of the elastic deformation portion 150 are described later. Since the film is stretched during the formation, the thickness is slightly reduced.

For example, as shown in FIG. 8, the elastically deforming portion 150 is molded into a terminal metal plate (a developed shape of the terminal metal) obtained by punching a metal flat plate having a predetermined thickness by using a cutting machine. , 47, two cut portions 152, 152 parallel to the width direction of the core wire 21 (in the direction perpendicular to the axial direction) are formed at a substantially central portion between the front end 47A and the rear end 47B. In FIG. 8, the cut portions 152 and 152 are formed in the developed shape (terminal metal plate) after the punching process of the metal plate material in the wire connection portion 40.
Next, between the two cut portions 152, 152 is pressed and deformed from the side opposite to the side on which the core wire 21 of the bottom plate portion 48 is placed (the back side of the paper in FIG. 8) by a press machine, and the elastic deformation portion 150. Is protruded in a cantilevered manner on the side of the bottom plate portion 48 on which the core wire 21 is placed (the front side of the drawing in FIG. 8).

Therefore, the elastically deforming portion 150 is slightly stretched when being pressed and deformed. In addition, by deforming the elastic deformation portion 150 to the side on which the core wire 21 is placed, an opening portion 161 that communicates with the top and bottom of the bottom plate portion 48 remains (FIG. 9).
As a result, when the molded elastic deformation portion 150 receives pressure during the crimping of the core wire 21, it is elastically deformed downward in FIG. 9 and exerts an elastic force on the core wire 21 after the core wire 21 is crimped. In addition, after crimping | compression-bonding, the opening part 161 will be substantially closed by the deformation | transformation of the elastic deformation part 150 pushed by the core wire 21. FIG.

Next, the manufacturing method of the electric wire 110 with a terminal metal fitting is demonstrated.
The exposed core wire 21 of the covered electric wire 20 is placed on the bottom plate portion 48 of the terminal fitting 130 obtained by bending the terminal original plate. Then, as shown in FIG. 5, the terminal fitting 130 is positioned on the anvil 70.
Then, the crimper 71 disposed above the terminal fitting 30 is lowered.
Then, the wire barrel portions 47, 47 of the terminal fitting 30 are deformed into a shape that wraps the core wire 21 according to the inner surface shape of the crimper 71, and are pressed downward so as to crush the core wire 21.

  Thereby, since the elastic deformation part 150 which protrudes from the baseplate part 48 and the baseplate part 48 is located under the core wire 21, it is pressed below with the core wire 21 (in the direction crushed). As a result, the elastic deformation portion 150 is elastically deformed as shown in FIG. 9 (in FIG. 9, the elastic deformation portion 150 is deformed into a downward convex curve similar to the bottom plate portion 48).

At this time, the core wire 21 receives a force compressed and pressed by caulking of the wire barrel portions 47 and 47 from above, and is biased by the elastic deformation portion 150 from below.
Then, when the crimper 71 is lowered to a predetermined position, the crimping of the electric wire 110 with terminal fitting is finished.

As described above, in the second embodiment, as in the first embodiment, the wire barrel portions 47 and 47 (barrel portions) not only have a force of pressing the core wire 21 toward the bottom plate portion 48 but also the elastic barrel 150 due to the elastic deformation portion 150. , 47 side, a force to push back the core wire 21 is applied. By applying a force for pressing the core wire 21 from the opposite directions, a force for holding the core wire 21 between the wire barrel portions 47 and 47 and the bottom plate portion 48 more strongly can be obtained.
That is, even if the force with which the wire barrel portions 47 and 47 press the core wire 21 is slightly weakened during crimping, the elastic deforming portion 150 can secure the electric wire holding force. The elongation of the metal fitting can be suppressed.
Further, since the elastically deforming portion 150 is in a cantilever shape, both ends of the elastically deforming portion 150 are supported by the bottom plate portion 48 as compared with the cantilever shape, and the load from the elastically deforming portion 150 is reduced. In addition to the effect that it can be dispersed at two locations, the elastic force generated at two locations can be applied to the core wire 21 side, so that the core wire 21 can be held with a stronger 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 above-described embodiment, the elastic deformation portions 50 and 150 are configured to extend in the axial direction or a direction orthogonal to the axial direction. However, the present invention is not limited thereto, and for example, elastic deformation extending in an oblique direction with respect to the axial direction. A part may be formed.

  (2) In the above embodiment, the elastic deformation portion is formed at one place, but the elastic deformation portion may be formed at a plurality of places.

Side view of the electric wire with terminal fittings of Embodiment 1 Perspective view of terminal fitting Side cross-sectional view of terminal fitting Diagram showing the unfolded shape of the terminal fitting Diagram showing crimper and anvil during crimping The figure showing a state where an elastic deformation part deforms in the case of pressure bonding Side view of the electric wire with terminal fittings of Embodiment 2 Diagram showing the unfolded shape of the terminal fitting Sectional drawing which shows the state in which the core wire was mounted in the baseplate part

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,110 ... Electric wire with a terminal metal fitting 20 ... Covered electric wire 21 ... Core wire 30 ... Terminal metal fitting 31 ... Terminal connection part 40 ... Electric wire connection part 41 ... Insulation barrel part 47 ... Wire barrel part (barrel part)
48 ... bottom plate part 50,150 ... elastic deformation part

Claims (6)

A wire connecting portion to which an electric wire is connected; and a terminal connecting portion that is provided integrally with the wire connecting portion, is aligned with the wire connecting portion along the axial direction of the wire, and is connected to the mating terminal portion. ,
The electric wire connecting portion has a bottom plate portion on which the core wire of the electric wire is placed, and barrel portions extended from both side portions of the bottom plate portion,
The surface of the bottom plate that is in contact with the core wire is deformed by pressure when the core wire is crimped, and an elastic deformation portion that exerts an elastic force on the core wire after the core wire is crimped is an axis of the core wire. A terminal fitting characterized in that both end portions along the direction are formed in a doubly-supported manner connected to the bottom plate portion. The electric wire with terminal fitting according to claim 1, further comprising holding means for holding the electric wire by caulking a pair of caulking pieces from above the insulating coating of the electric wire. The electric wire with a terminal metal fitting formed by placing the core wire with the covered electric wire exposed on the bottom plate portion of the terminal metal fitting according to claim 1 or 2, and pressing the core wire so as to wrap the core wire by the barrel portion. A wire connecting portion to which an electric wire is connected; and a terminal connecting portion that is provided integrally with the wire connecting portion, is aligned with the wire connecting portion along the axial direction of the wire, and is connected to the mating terminal portion. ,
The electric wire connecting portion has a bottom plate portion on which the core wire of the electric wire is placed, and barrel portions extended from both side portions of the bottom plate portion,
The surface of the bottom plate that is in contact with the core wire is deformed by pressure when the core wire is crimped, and an elastic deformation portion that exerts an elastic force on the core wire after the core wire is crimped is an axis of the core wire. A terminal fitting characterized in that both end portions in a direction orthogonal to the direction are formed in a cantilevered manner continuous to the bottom plate portion. The electric wire with a terminal fitting according to claim 4, further comprising holding means for holding the electric wire by caulking a pair of caulking pieces from above the insulating coating of the electric wire. The electric wire with a terminal metal fitting formed by mounting the core wire with which the covered electric wire is exposed on the bottom plate portion of the terminal metal fitting according to claim 4 or 5, and crimping the core wire so as to wrap the core wire.

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