JP5065124B2 - Crimp terminal - Google Patents

Description

  The present invention relates to, for example, a crimp terminal that is crimped to a conductor portion of a covered electric wire and attached to the tip of the covered electric wire.

Conventionally, as a terminal fitting to be attached to the tip of a covered electric wire, a crimp terminal provided with a crimping portion for crimping a conductor part with a sheath removed has been often used.
Specifically, the crimp terminal includes a terminal connection portion disposed on the distal end side and a crimp portion disposed on the proximal end side that crimps the conductor portion of the covered electric wire, and the crimp portion is placed on the conductor portion. A crimping bottom called a wire barrel extending from both sides in the width direction of the crimping bottom, and a locking groove having a groove shape in the width direction called serration is formed in the front-rear direction on the crimping bottom. A plurality are provided at predetermined intervals.

  With the crimping terminal configured as described above, the conductor portion placed on the crimping bottom surface can be crimped with a crimping piece, and the terminal connection portion and the conductor portion can be electrically and mechanically connected.

  However, in such a connection between the crimp terminal and the conductor part, if the crimping by the crimping piece is weak, the electrical resistance in the electrical connection with the conductor part increases, and conversely, if the crimping by the crimping piece is strong, it will bite into the serration. As a result, the deformation load of the conductor increases, the strength of the conductor portion decreases, and there is a concern that the conductor portion may break at a load less than that required for use.

  Therefore, by interposing a crimping member, which is a separate member, between the crimping part and the conductor part, the contact area is expanded and the electric resistance is reduced without performing strong crimping that breaks the conductor part. A crimping method that can be used has been proposed (see Patent Document 1). By using this crimping method, both good electrical connection and mechanical connection can be achieved.

However, the electric wires have been made extremely thin in response to the recent reduction in weight and size of electronic devices, and when crimping the thinned conductor portion to the crimp terminal, a crimping member constituted by a separate member is interposed. Was difficult.
JP 2005-302475 A

  An object of this invention is to provide the crimp terminal which can improve electrical connectivity and mechanical connectivity.

According to the present invention, a crimping portion for crimping a conductor portion of a covered electric wire is constituted by a crimping bottom surface on which the conductor portion is placed, and a crimping piece extending from both sides of the crimping bottom surface in the width direction. , and short short crimping pieces of extended length extending from one side of the width direction on both sides, as well as composed of a long length crimping piece of extended length extending from the other side of the width direction on both sides The extension length of the crimping piece is set according to the diameter of the conductor portion to be crimped by the crimping portion, and the crimping bottom surface is configured with the bottom surface width according to the curl width in the crimping state of the long crimping piece. Thus, the bottom width W of the crimping bottom surface is based on the thickness t of the short crimping piece, the curl width w obtained by curling the long crimping piece with a lower limit curvature, and the curl width c obtained by curling the short crimping piece, While setting so that following Formula (1) w + t <= W <2w may be satisfied, The long crimping piece is curled and crimped so that the conductor part is pressed against the crimping bottom surface, and the short crimping piece presses the conductor part of the long crimping piece that cannot be held by the curl. When crimping, the following formula (2) is set so as to satisfy W = w + c, the long crimping piece is curled and crimped so as to wrap around the outer periphery of the conductor part, and the short crimping piece When crimping along the long crimping piece to be wound, the crimping terminal is set to satisfy the following formula (3) W = w + t .

  As an aspect of the present invention, the crimping bottom surface can be provided with a locking groove in the width direction, and a side surface in the width direction that is an end in the width direction of the locking groove can be formed as an inclined side surface.

  The crimp terminal includes a connection terminal including the crimp part and a female connector BOX, a male connector BOX, or a terminal connection part such as a screw insertion hole, or a connection terminal constituted by only the crimp part. .

  The covered electric wire is a covered electric wire in which a conductor portion in which a plurality of wires are made of pure copper, copper alloy, aluminum, or aluminum alloy is covered with an insulating covering, for example, a wire made of annealed copper wire A very thin covered electric wire having a conductor portion formed.

The said crimping | compression-bonding part is a wire barrel of the open barrel type which is a back view substantially U type in the state before crimping | compression-bonding.
The short crimping piece with a short extension extending from one side of the both sides in the width direction and the long crimping piece with a long extension extending from the other side of the both sides in the width direction are each in the width direction. Short crimping piece and long crimping piece arranged on each side, short crimping piece and long crimping piece on the first half and the latter half on one side in the width direction, and arranged alternately depending on the crimping piece on one side In addition, a short pressure-bonding piece and a long pressure-bonding piece on the other side are included.

  The curled width of the crimped piece in the crimped state includes, for example, the width of the crimped piece curled at the lower limit curvature in a state where the crimped piece is sandwiched between the crimper applicator and the anvil. The lower limit curvature is a curl radius determined according to the plate thickness, material, and the like, and refers to a curvature that allows the crimped piece to be curled without causing buckling or cracking.

The locking groove includes a serration having a cross-sectional groove shape arranged in a width direction substantially perpendicular to the longitudinal direction.
The inclined side surface includes a side surface formed by a tapered surface provided at an end in the width direction of the locking groove.

Thus, the crimping portion for crimping the conductor portion of the covered electric wire is constituted by the crimping bottom surface on which the conductor portion is placed and the crimping pieces extending from both sides in the width direction of the crimping bottom surface. , and short short crimping pieces of extended length extending from one side of the width direction on both sides, as well as composed of a long length crimping piece of extended length extending from the other side of the width direction on both sides By setting the extension length of the crimping piece according to the diameter of the conductor part to be crimped by the crimping part, the conductor part can be crimped in various states of crimping.

  Specifically, for example, curl only the long crimping piece and crimp it so that all of the thin conductor part is held with the long crimping piece, or curl the short crimping piece a little in addition to the curling of the long crimping piece. The long crimping piece and the short crimping piece can constitute a crimping state that substantially surrounds the outer periphery of the conductor part, or a crimping state corresponding to the diameter of the conductor part to be crimped. Therefore, a conductor part and a crimp terminal can be connected reliably.

  Further, by forming the crimping bottom surface with a bottom surface width corresponding to the curl width in the crimped state of the long crimping piece, a crimping bottom surface formed with an appropriate bottom surface width can be configured.

  The curled width in the crimped state of the long crimped piece is a curled width corresponding to the lower limit curvature determined by the material and thickness of the long crimped piece in the crimped state, so that the crimped bottom surface is crimped to the long crimped piece. By configuring with the bottom surface width corresponding to the curl width in the state, the conductor portion can be crimped with a long crimping piece without a gap. Therefore, the contact area can be secured and the crimped state is stabilized, so that the electrical connectivity and the mechanical connectivity can be improved.

  Specifically, when the width of the bottom surface of the crimping surface is wider than the curled width of the long crimping piece, a gap is created between the conductor part in the crimped state and the long crimping piece, and the contact area is reduced, so that electrical connection is achieved. And mechanical connectivity will be reduced.

  Conversely, if the width of the bottom surface of the crimping surface is narrower than the curl width of the long crimping piece, the conductor part that is crimped between the long crimping piece and the crimping bottom surface cannot be clamped or the bottom surface width is narrow. As a result, the crimping stress acting on the conductor portion increases, making it difficult to realize reliable electrical connection and mechanical connection.

  On the other hand, as described above, the bottom surface width of the crimping bottom surface is configured with the bottom surface width corresponding to the curl width in the crimped state of the long crimping piece, so that an extra crimping load is not applied and the contact area is ensured. A stable connection state can be realized.

  Furthermore, in addition to the configuration of the bottom surface width of the crimping bottom surface in accordance with the curled width of the crimped state of the long crimping piece, the other crimping piece of the two crimping pieces is composed of the short crimping piece, so that a thinner conductor Even in the case of a covered electric wire composed of parts, it is possible to realize a good connection state as described above.

Further, the bottom width W of the crimping bottom surface is based on the thickness t of the short crimping piece, the curl width w obtained by curling the long crimping piece with a lower limit curvature, and the curl width c obtained by curling the short crimping piece. By setting so as to satisfy the formula (1) and the formula (2) or (3) , it is possible to realize a connection with high electrical connectivity and mechanical connectivity uniformly.

Specifically, the bottom width W of the crimping bottom surface is based on the curling width w of the long crimping piece curled by the thickness t of the short crimping piece and the lower limit curvature, and the curled width c of the short crimping piece and the long crimping piece. to set according to the compression mode by short crimping pieces in the crimping state of the crimping portion, the conductor portion to be crimped, between the crimping bottom and crimping piece for crimping, unwanted gaps such as electrical resistance increases Can be prevented. In this way, since a crimped state in which unnecessary gaps are not generated can be configured, uniform electrical connectivity and mechanical connectivity can be realized.
Therefore, as described above, a stable crimped state can be configured even for a conductor portion of an electric wire that has been thinned in accordance with downsizing of an electronic device.

  Further, when the crimping bottom surface is provided with a locking groove in the width direction, and the width direction side surface that is the width direction end portion of the locking groove is formed by the inclined side surface, the conductor portion is crimped by the crimping portion. The deformation along the locking groove, that is, the deformation that bites into the locking groove occurs in the conductor portion, and the pulling resistance of the conductor portion crimped by the crimping portion can be improved and the mechanical connectivity can be improved.

  In addition, when a part of the crimped conductor part is deformed according to the locking groove, the edge part of the locking groove applies a strong pressure locally to the conductor part, and occurs on the surface of the conductor part. Resisting substances such as oxides can be removed, and electrical connectivity can be improved.

  Furthermore, by forming the side surface in the width direction as an inclined side surface, the burden caused by deformation of the conductor portion in the vicinity of the end portion in the width direction of the locking groove is reduced in the biting deformation into the locking groove caused by the pressure bonding by the pressure bonding portion. be able to.

Specifically, by forming the width side surface that is the width direction end portion of the locking groove as an inclined side surface, the deformation of the conductor portion in the vicinity of the width direction end portion of the locking groove is the tip side groove that forms the groove shape. In addition to the deformation in the longitudinal direction due to the side surface and the proximal side groove side surface, the deformation in the width direction due to the width direction side surface is also added, but by forming the width direction side surface as an inclined side surface, the deformation in the width direction due to the width direction side surface becomes gentle. Further, it is possible to reduce a load caused by deformation at the end portion in the width direction of the locking groove.
Therefore, machine connectivity can be improved.

  According to this invention, the crimp terminal which can improve electrical connectivity and mechanical connectivity can be obtained.

An embodiment of the present invention will be described below with reference to the drawings.
1 shows an explanatory view of the crimp terminal 1 by a perspective view, FIG. 2 shows an explanatory view of the crimp terminal 1 by a plan view, etc., and FIG. 3 shows an explanatory view explaining a crimp method of the wire barrel portion 10. FIG. 4 shows an explanatory view of the wire barrel portion 10 by a cross-sectional view in the width direction.

  In the crimp terminal 1, a wire barrel portion 10 for crimping the core wire 102 of the covered electric wire 100 includes a barrel bottom portion 11 on which the core wire 102 is placed, and a wire barrel piece 12 extending from both sides in the width direction Y of the barrel bottom portion 11 portion. It consists of and.

  The wire barrel piece 12 includes a short barrel piece 12a having a short extension length extending from one side in both sides in the width direction and a long barrel having a long extension length extending from the other side in both sides in the width direction. It consists of a piece 12b.

  Further, the barrel bottom portion 11 is configured with a bottom surface width W corresponding to the curl width w in the crimped state of the long barrel piece 12b, the barrel bottom portion 11 is provided with a serration 20 in the width direction Y, and the width direction in the serration 20 The width direction side surface 24 which is the edge part of Y is formed in the taper side surface.

  The configuration of the crimp terminal 1 described above will be described in detail. The crimp terminal 1 includes a connector box 2 that allows insertion of a male connector (not shown) from the front to the rear in the longitudinal direction X, and the rear of the connector box 2. A wire barrel portion 10 disposed via a first transition 18 having a predetermined length, and an insulation barrel portion 15 disposed behind a wire barrel portion 10 via a second transition 19 having a predetermined length. Are integrally formed.

The wire barrel part 10 is crimped by crimping the core wire 102 of the covered electric wire 100 with the wire barrel piece 12, and the insulation barrel part 15 is fixed by caulking the insulating coating 101 of the covered electric wire 100 with the insulation barrel piece 16. Yes.
The covered electric wire 100 constitutes a core wire 102 by bundling ultrafine wires that are thinner than conventional stranded wires in accordance with the recent reduction in size and weight of electronic devices.

  The crimp terminal 1 is three-dimensionally configured by bending from a plate state before assembly as shown in FIG. The connector box 2 is formed of an inverted hollow square column body, and includes a contact piece 2a that is bent backward in the longitudinal direction X and contacts a male connector to be inserted.

  As shown in FIG. 1B, the wire barrel portion 10 before crimping is composed of a barrel bottom portion 11 and wire barrel pieces 12 (12a, 12b) extending obliquely outward and upward from both sides in the width direction Y. And it is formed in a rear view substantially U-shape.

  Similarly, the insulation barrel portion 15 before crimping is also composed of a barrel bottom portion 17 and insulation barrel pieces 16 (16a, 16b) extending obliquely outward and upward from both sides in the width direction, and is substantially U-shaped in rear view. Is formed.

As described above, of the two wire barrel pieces 12 extending obliquely outward and upward from both sides in the width direction, the right side in the rear view is the short barrel piece 12a having a short extension length (L1), and the left side in the rear view that is the other side. Is a long barrel piece 12b having a long extension length (L2).
The extension length L is set to the length in the width direction Y with the width direction center CL of the crimp terminal 1 as a reference.

  Similarly, of the two insulation barrel pieces 16 that extend obliquely outward and upward from both sides in the width direction, the right side in the rear view is the short barrel piece 16a having a short extension length, and the left side in the rear view that is the other side is the extension length. The long barrel piece 16b is long.

  The extension length L1 of the short barrel piece 12a and the extension length L2 of the long barrel piece 12b are set according to the diameter D of the core wire 102 to be crimped by the wire barrel portion 10 (see FIG. 1B). ing.

  Further, as shown in FIG. 4B, the barrel bottom 11 of the wire barrel portion 10 is set to have a bottom surface width W corresponding to a curl width w that the long barrel piece 12 b curls and crimps the core wire 102. More specifically, the bottom surface width W of the barrel bottom 11 satisfies the above formula (1), and is set to a width that combines the curl width w of the long barrel piece 12b and the bending width c of the short barrel piece 12a.

  Further, as shown in the enlarged view of the part a in FIG. 1, the barrel bottom 11 is arranged at a predetermined interval in the longitudinal direction X, and is formed to have a length similar to the length in the width direction Y of the barrel bottom 11. The width direction side surface 24 which is the width direction edge part in the serration 20 is formed in the taper side surface.

  Each of the serrations 20 has a square section in the concave longitudinal direction formed by a front side surface 21 and a rear side surface 22 orthogonal to the barrel bottom portion 11 and a serration bottom surface 23 connecting the lower ends of the front side surface 21 and the rear side surface 22. It is formed in a certain groove shape. A serrated bottom surface 23 connecting the lower ends of the front side surface 21 and the rear side surface 22 is formed as a surface parallel to the barrel bottom portion 11.

  In the state before crimping of the crimp terminal 1 configured as described above, the wire barrel portion 10 and the covered electric wire 100 are arranged as shown in FIG. 1B and crimped by the crimp applicator 200 shown in FIG. As shown in FIG. 1 (c), the core wire 102 is crimped by the wire barrel portion 10, and the crimp terminal 1 can be attached to the covered electric wire 100.

  Specifically, the covered electric wire 100 is placed from above the crimp terminal 1 so that the core wire 102 of the covered electric wire 100 is inside the wire barrel portion 10 and the vicinity of the front end of the insulating coating 101 is inside the insulation barrel portion 15. (See FIG. 1B), set on the anvil 201 of the crimping applicator 200 shown in FIG. 3 (see FIG. 3A).

Then, as shown in FIG. 3 (b), the crimper 202 is lowered from above the wire barrel part 10, and the wire barrel part 10 is sandwiched between the anvil 201 and the crimper 202, as shown in FIG. The wire barrel piece 12 is curled.
The shape of the crimper 202 is determined according to the desired crimped shape, and may be symmetric or asymmetric.

  Simultaneously with the crimping of the wire barrel 10 described above, the crimper for the insulation barrel (not shown) is lowered from the top of the insulation barrel 15, and the anvil for the insulation barrel and the crimper for the insulation barrel are used for the insulation. The insulation barrel piece 16 is curled by sandwiching the insulation barrel portion 15.

  At this time, as shown in FIG. 4B, the long barrel piece 12b is curled and crimped so as to hold the core wire 102 against the barrel bottom 11, and the short barrel piece 12a is curled by the long barrel piece 12b. Crimp so that the core wire 102 of the part that could not be held in is pressed.

Alternatively, as shown in FIG. 4C in the lower right of FIG. 4, the long barrel piece 12b is curled and crimped so that the outer periphery of the core wire 102 is wound, and the short barrel piece 12a is a long barrel around which the core wire 102 is wound. Crimping is performed along the piece 12b.
The bending width c of the short barrel piece 12a is larger than the thickness t of the short barrel piece 12a and smaller than the curl width w of the long barrel piece 12b.

  Thus, the core wire 102 is crimped in close contact with the inner surfaces of the wire barrel piece 12 and the barrel bottom portion 11, and in this state, a contact area between the core wire 102 and the wire barrel portion 10 can be ensured.

  Accordingly, the wire barrel portion 10 of a normal crimp terminal in which the bottom width W of the barrel bottom portion 11 as shown in FIG. 4D shown in the lower left of FIG. 4 is set independently of the curl width w of the long barrel piece 12b. 'Compared to the case, reliable and stable connection can be realized.

Specifically, in the wire barrel portion 10 ′ having two wire barrel pieces 12 ′ having the same length, the bottom surface width W ′ of the barrel bottom portion 11 ′ is configured to be about twice the curl width w ′ of the wire barrel pieces 12 ′. Therefore, when crimping the core wire 102 composed of an extremely fine strand, a gap is generated around the core wire 102 in the crimping space 10A ′ surrounded by the wire barrel piece 12 ′ and the barrel bottom portion 11 ′.
Even if the wire barrel portion 10 'is further compressed in this state, the tip of the wire barrel piece 12' is attached to the barrel bottom portion 11 ', so that it cannot be compressed any further, and the core wire 102 can be sufficiently compressed. Without any gaps.

  Due to the gap generated around the core wire 102, the contact area between the inner surface of the barrel bottom 11 'or the wire barrel piece 12' and the core wire 102 is reduced. In addition, in the crimped state as shown in FIG. 4D, since a gap is generated around the core wire 102, the crimped state of the core wire 102 is not stable.

  Thus, when crimping the core wire 102 composed of ultrafine strands, in the case of the wire barrel portion 10 ′ having the same length of the wire barrel piece 12 ′, the curl width w ′ of the wire barrel piece 12 ′ is Since the bottom surface width W ′ of the barrel bottom 11 is determined, the gap around the core wire 102 cannot be filled, and it is difficult to ensure a stable connection state.

  However, like the wire barrel portion 10 of the crimp terminal 1 of the present embodiment, the short barrel piece 12a and the long barrel piece 12b having different lengths are provided, and the bottom width W of the barrel bottom portion 11 is set to be equal to that of the long barrel piece 12b. According to the curl width w of the lower limit curvature and the bending width c of the short barrel piece 12a, since it is determined to satisfy the above formula (1), as shown in FIG. 4 (b) and FIG. 4 (c), The core wire 102 can be crimped in a state where the outer periphery of the core wire 102 is in close contact with the barrel bottom 11 and the inner surface of the wire barrel piece 12. Therefore, the contact area of the inner surface of the barrel bottom 11 and the wire barrel piece 12 and the core wire 102 can be ensured.

  Furthermore, since the crimping space surrounded by the wire barrel piece 12 and the barrel bottom 11 is filled with the core wire 102, that is, the crimping is performed without a gap on the outer periphery of the core wire 102, a stable connection state without play. Can be secured. Therefore, both mechanical connectivity and electrical connectivity can be improved.

  Further, the length L (L1, L2) of the short barrel piece 12a or the long barrel piece 12b is set according to the diameter D of the core wire 102 to be crimped, and the bottom width W of the barrel bottom 11 is set to the long barrel piece 12b. By setting the width in accordance with the curl width w in the crimping state, a stable connection state can be realized in which the contact area as described above can be stably secured regardless of the core wire 102 of any diameter. Can do.

  Moreover, in the crimping state of the core wire 102 in such a wire barrel part 10, as shown in FIG.4 (b) and FIG.4 (c), the outer peripheral part of the core wire 102 comprised by several ultrafine wire is serrated 20 Deform along.

  In this way, the deformation along the serration 20, that is, the biting deformation portion 103 that bites into the serration 20 is deformed into a quadrangular cross-sectional shape corresponding to the quadrangular cross-sectional groove shape of the serration 20, and protrudes outward in the radial direction of the core wire 102. It becomes.

  Moreover, since the width direction side surface 24 which is the width direction edge part in the serration 20 is formed in the taper side surface, as shown in FIG.4 (b), the edge part 103c of the biting deformation part 103 is formed in a taper shape. The Rukoto.

  Thus, when the core wire 102 is crimped to the barrel bottom portion 11 by the wire barrel piece 12 and deformed along the shape of the serration 20, the edge portion 22a formed by the rear side surface 22 and the barrel bottom portion 11 of the serration 20 is formed. A strong pressure can be applied locally to the core wire 102 to remove a resistance substance such as an oxide generated on the surface of the core wire 102, and electrical connectivity can be improved.

  Further, since the contact deformation area between the barrel bottom 11 and the core wire 102 is increased by forming the biting deformation portion 103 that bites into the serration 20, the electrical connectivity between the wire barrel portion 10 and the core wire 102 is further improved. be able to.

  Moreover, the biting deformation | transformation part 103 which digs into the serration 20 can increase the resistance of the drawing direction with respect to the wire barrel part 10 of the core wire 102, and can improve mechanical connectivity.

  Furthermore, since the width direction side surface 24 which is the width direction edge part in the serration 20 is formed by the taper side surface, as shown in FIG.4 (b), the deformation | transformation load of the core wire 102 by the width direction side surface 24 of the serration 20 is applied. Reduced.

  Specifically, when the width direction side surface 24 is configured by an end surface orthogonal to the barrel bottom portion 11, the deformation of the core wire 102 in the vicinity of the width direction side surface 24 of the serration 20 is caused by the deformation in the longitudinal direction by the front side surface 21 and the rear side surface 22. In addition, since the deformation in the width direction by the end surface orthogonal to the barrel bottom 11 is also added, the load due to the deformation is increased as compared with the portion where only the deformation in the other longitudinal direction occurs, and for example, a pulling force in the pulling direction is given. There is a risk of breaking.

  However, by forming the width side surface 24 as a tapered side surface, the deformation of the end portion 103c by the width direction side surface 24 becomes gentle, and the load due to the deformation on the width direction side surface 24 of the serration 20 can be reduced. Therefore, a more reliable and stable mechanical connection can be realized.

In correspondence between the configuration of the present invention and the above-described embodiment,
The conductor portion of the present invention corresponds to the core wire 102,
Similarly,
The crimping part corresponds to the wire barrel part 10,
The crimping bottom surface corresponds to the barrel bottom 11,
The crimping piece corresponds to the wire barrel piece 12,
The short crimping piece corresponds to the short barrel piece 12a,
The long crimping piece corresponds to the long barrel piece 12b,
The locking groove corresponds to serration 20,
The inclined side corresponds to the tapered side,
The short extension length corresponds to L1,
Long extension length corresponds to L2,
The diameter of the conductor part corresponds to D,
The bottom width corresponds to W,
The curl width corresponds to w,
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

Explanatory drawing by the perspective view of a crimp terminal. Explanatory drawing of a crimp terminal. Explanatory drawing explaining the crimping | compression-bonding method of a wire barrel part. Explanatory drawing by the width direction sectional drawing of a wire barrel part.

DESCRIPTION OF SYMBOLS 1 ... Crimp terminal 2 ... Connector box 10 ... Wire barrel part 11 ... Barrel bottom part 12 ... Wire barrel piece 12a ... Short barrel piece 12b ... Long barrel piece 20 ... Serration 24 Side surface 100 ... Covered electric wire 102 ... Core wire L1 ... Short Extension length L2 ... Long extension length D ... Conductor diameter W ... Bottom width w ... Curl width Y ... Width direction

Claims (2)

The crimping part that crimps the conductor part of the covered wire
It is composed of a crimping bottom surface on which the conductor portion is placed and a crimping piece extending from both sides in the width direction of the crimping bottom surface,
The crimping piece
A short crimping piece with a short extension length extending from one side of the both sides in the width direction,
The length of the crimping piece extends from the other side of the both sides in the width direction, and the extension length of the crimping piece depends on the diameter of the conductor portion to be crimped by the crimping portion. Set,
The crimping bottom surface,
The bottom surface width W of the press-bonded bottom surface is configured to have a bottom surface width corresponding to the curl width in the crimped state of the long press-bonded piece .
Based on the thickness t of the short pressure-bonded piece, the curl width w obtained by curling the long pressure-bonded piece with a lower limit curvature, and the curl width c obtained by curling the short pressure-bonded piece,
While setting so that following Formula (1) w + t <= W <2w may be satisfied,
The long crimping piece is curled and crimped so as to hold the conductor part against the crimping bottom surface, and the short crimping piece presses the conductor part of the long crimping piece that cannot be held by the curl. When crimping
Set to satisfy the following equation (2) W = w + c,
When the long crimping piece is curled and crimped so as to wrap around the outer circumference of the conductor part, and the short crimping piece is crimped along the long crimping piece so as to wind the conductor part,
Crimp terminal set to satisfy the following formula (3) W = w + t . Provided with a locking groove in the width direction on the crimping bottom surface,
Widthwise side a widthwise end portion of the engagement groove, crimp terminal according to claim 1 formed with inclined sides.

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