JP5904355B2 - Single-core wire terminal crimping structure - Google Patents

Description

  The present invention relates to a terminal crimping structure of a single core electric wire in which a terminal is crimped and connected to a thick single core wire made of a single aluminum wire or copper wire.

  Conventionally, various structures have been proposed in order to crimp and connect a conductive metal terminal to a conductive metal core wire of an electric wire.

  For example, in Patent Document 1 (not shown), in order to reduce the shearing force on the conductor portion of the aluminum wire during crimping, an inclined portion is formed at the rear end of the crimper that is the upper crimping jig, and during crimping. It is described that a diagonally upward relief portion is formed in the terminal barrel (crimp piece) to release the shearing force of the conductor portion of the aluminum electric wire along the relief portion.

  Further, in Patent Document 2 (not shown), a spring copper terminal is used to stabilize the contact resistance of the crimping part in a heat cycle or the like. It is described that a spring portion having a shape is formed so that the crimping piece follows when the conductor of the electric wire contracts.

  Further, Patent Document 3 (not shown) is not a crimping of an electric wire and a terminal, but in order to crimp and fix a cylindrical ferrule to an optical fiber core wire, hexagons (regular polygons) are formed on upper and lower crimping jigs. In addition, a ridge-shaped bulge is formed at the center of each side of the groove, a valley-shaped relief groove is formed on both sides of the bulge, and the ferrule has the same shape as the groove of the crimping jig. It is described that crimping is performed.

  In the above Patent Documents 1 and 2, the core wire of the electric wire is a multi-core wire obtained by twisting a plurality of (many) strands. However, as the cross-sectional area of the multi-core wire increases, the number of strands increases and the manufacturing cost increases. Therefore, in order to reduce the manufacturing cost, electric wires used in parts that do not require flexibility should be made of a conductive metal using a single core wire made of a single copper wire or aluminum wire instead of a multi-core wire. Crimped to the terminal. An insulation coated electric wire having a single core wire is called a single core electric wire.

  6 (a) and 6 (b) show one form of a conventional terminal crimping structure of a single core electric wire in which a single core wire which is a conductor portion of the single core electric wire is crimped and connected to a terminal.

  As shown in FIG. 6A, in the state where the insulation coating 42 of the terminal portion of the single-core electric wire 41 is peeled and the single-core wire 43 is exposed in the center in the radial direction, the single-core wire 43 is connected to the substantially U-shaped crimp portion 9 of the terminal. As shown in FIG. 6B, the terminal crimping portion 9 is formed in a substantially horizontal B-shape (substantially) on the single core wire 43 by upper and lower crimping jigs (upper crimper and lower anvil) (not shown). Crimp to glasses. This crimping shape is known as a Giboshi type or a Faston (registered trademark) type.

  In the initial state of FIG. 6A, the terminal crimping portion 9 is composed of a bottom plate portion 10 having a curved cross section and a pair of crimping pieces 11 raised up obliquely upward from the left and right sides of the bottom plate portion 10. . At the time of crimping in FIG. 6B, the pair of crimping pieces 11 are folded inward (downward) to bend in a curved shape, and the tip 11b of each crimping piece 11 bites into the single core wire 43, and the bottom plate 10 And the lower end part of each crimping piece 11 extends horizontally, and at the same time, the single core wire 43 is strongly pressed vertically by the crimping part 9 and extends horizontally.

JP 2009-87848 A JP 2009-224120 A Japanese Patent Laid-Open No. 5-288958

  Since the conventional terminal crimping structure for electric wires described in Patent Documents 1 and 2 corresponds to a core wire composed of a plurality of strands, there is a concern that it is not suitable for crimping a single core wire. Moreover, although the jig | tool which has a regular polygon groove | channel described in patent document 3 can be applied to the cylindrical crimping | compression-bonding part of a terminal, it is unsuitable for crimping a pair of crimping piece of a terminal. There was concern.

  Further, in the conventional terminal crimping structure of the single core electric wire 41 shown in FIG. 6, unlike the multicore electric wire, the load at the time of crimping the terminal is difficult to disperse. The portion 11b bites into the single core wire 43, the contact pressure between the crimp piece 11 and the single core wire 43 becomes very high at the tip end side (A portion in FIG. 6), and the upper and lower crimping jigs ( In order to compress the crimping piece 11 and the single core wire 43 in the vertical direction by the clamp and the anvil), the contact pressure between the crimping piece 11 and the single core wire 43 is increased in the bottom plate portion 10 (B portion in FIG. 6) of the terminal. On the other hand, the phenomenon that the contact pressure between the crimping piece 11 and the single core wire 43 tends to be low in the left and right substantially vertical portions 11c (C portion in FIG. 6) of the pair of crimping pieces 11 tends to occur.

  Therefore, as shown in FIG. 7, in the upper and lower portions of the terminal crimping portion 9 (A and B portions in FIG. 7), the crimping portion 9 and the single core wire 43 are creeped (the metal passes over time under a constant load). As a result, there is a concern that the contact pressure decreases and the electrical contact resistance may increase.

  In view of the above points, the present invention is less likely to cause a decrease in partial contact pressure between a single core wire and a terminal due to creep or the like when a terminal is crimped and connected to a single core wire made of conductive metal, and has an electrical contact resistance. It aims at providing the terminal crimping structure of the single core electric wire which can prevent an increase.

In order to achieve the above object, the terminal crimping structure for a single core electric wire according to claim 1 of the present invention is provided with a plurality of recesses and projections on the outer periphery of a single core wire made of conductive metal, and the plurality of recesses and projections. A single-core electric wire terminal crimping structure in which a terminal core crimping portion is crimped and connected to the single-core wire having a portion, the single-core wire is provided with a slit in the longitudinal direction of the single-core wire from the tip surface of the single-core wire, folded tip of the pair of crimping pieces of the crimping portion is characterized in that it enters into the said slit crimped state of the crimping portion.

With the above configuration, the single core wire of the single core wire is set inside the core wire crimp portion of the terminal, and the core wire crimp portion is pressed in the radial direction by a pair of crimping jigs to crimp the single core wire of the single core wire in the radial direction. In this case, when there is an excessive portion of the caulking force (crimping force) in the circumferential direction of the single core wire, the concave portion is excessive while the core wire crimp portion enters the convex portion into the concave portion of the single core wire. The core wire crimping part crimps the single core wire with a substantially uniform crimping force over the entire circumference, and press-contacts with a substantially uniform contact pressure over the entire circumference of the single core wire.
In addition, the folded tip of the pair of crimping pieces tries to strongly press the single core wire in the folding direction (radial direction). However, excessive pressure (crimping) is caused by the tip of the crimping piece entering the slit. Force) is absorbed, and the core wire crimping portion including the pair of crimping pieces is pressed and brought into close contact with the single core wire with substantially uniform crimping force over the entire circumference by synergistic action with the recess.

  The terminal crimping structure of the single core electric wire according to claim 2 is the terminal crimping structure of the single core electric wire according to claim 1, wherein the plurality of recesses and projections are concave grooves and projections extending in the longitudinal direction of the single core wire. It is characterized by being.

  With the above configuration, the longitudinal grooves and ridges are alternately arranged in the circumferential direction of the single core wire, and when the terminal is crimped, the excessive crimping force portion of the terminal core crimping portion of the terminal enters the convex shape. Meanwhile, the concave groove absorbs excessive crimping force.

  The terminal crimping structure of the single core electric wire according to claim 3 is the terminal crimping structure of the single core electric wire according to claim 1, wherein the plurality of recesses and projections are concave grooves and projections extending in the circumferential direction of the single core wire. It is characterized by being.

  With the above configuration, circumferential grooves and ridges are alternately arranged in the longitudinal direction of the single core wire, and when the terminal is crimped, the excessive crimping force portion of the core wire crimping portion of the terminal enters the convex shape. Meanwhile, the concave groove absorbs excessive crimping force.

The terminal crimping structure of the single-core electric wire according to claim 4 is provided such that a single-core wire made of a conductive metal is provided with a slit in the longitudinal direction of the single-core wire from the front end surface of the single-core wire, and the single-core wire is arranged in the single-core wire radial direction by the slit. is divided into, in a state where the core wire crimping portion comprising a pair of crimping pieces of the terminal is crimped to the single core wire, and characterized in that folded tip of the pair of crimping pieces are entered into the slit To do.

  With the above configuration, the single core wire of the single core wire is set inside the core wire crimp portion of the terminal, and the core wire crimp portion is pressed in the radial direction by a pair of crimping jigs to crimp the single core wire of the single core wire in the radial direction. At that time, the folded tip end of the pair of crimping pieces tries to strongly press the single core wire in the folding direction (radial direction), but the tip of the crimping piece enters the slit. Excessive pressing force (crimping force) is absorbed, and the core wire crimping portion including the pair of crimping pieces is pressed and adhered to the single core wire with substantially uniform crimping force over the entire circumference.

According to the first aspect of the present invention, when a terminal is crimped and connected to a single core wire made of a conductive metal, a single core wire due to creep or the like is absorbed by absorbing a partial excessive crimping force of the terminal at the concave portion of the single core wire. The contact pressure between the terminal and the terminal can be prevented from being lowered, the electrical contact resistance can be prevented from increasing, and the reliability of the electrical connection between the terminal and the single-core electric wire can be improved. Moreover, the effect of the said invention can be exhibited more reliably by a synergistic action with a recessed part, absorbing the excessive crimping | compression-bonding force of the front-end | tip part which a pair of crimping piece turned back by a slit.

  According to the invention described in claim 2, the effect of the invention described in claim 1 can be reliably exhibited by absorbing a partial excessive crimping force of the terminal in the longitudinal groove of the single core wire. .

  According to the invention described in claim 3, the effect of the invention described in claim 1 can be reliably exhibited by absorbing a partial excessive crimping force of the terminal in the circumferential groove of the single core wire. .

According to the fourth aspect of the present invention, when the terminal is crimped and connected to the single core wire made of conductive metal, a partial excessive crimping force caused by the folded tip of the pair of crimp pieces of the terminal is applied to the slit of the single core wire. Absorbing at the terminal prevents partial contact pressure drop between the single core wire and the terminal due to creep, etc., prevents an increase in electrical contact resistance, and increases the reliability of the electrical connection between the terminal and the single core electric wire. be able to.

The form of the single core electric wire in 1st embodiment of the terminal crimping structure of the single core electric wire which concerns on this invention is shown, (a) is a perspective view, (b) is a front view. The state which set the single core electric wire in 1st embodiment to the terminal is shown, (a) is a perspective view, (b) is a front view. The state which crimped | bonded the terminal to the single core electric wire in 1st embodiment is shown, (a) is a perspective view, (b) is a front view. It is a perspective view which shows one form of the single core electric wire in 2nd embodiment of the terminal crimping structure of the single core electric wire which concerns on this invention. 3rd embodiment of the terminal crimping structure of the single core electric wire which concerns on this invention is shown in order of a process, (a) is a perspective view of a single core electric wire, (b) is a perspective view of the state which put the slit in the single core wire, ( c) is a perspective view of a state in which a terminal is crimped to a single core electric wire. 1A and 1B show a form of a conventional terminal crimping structure for a single-core electric wire, in which FIG. 1A is a front view in a set state, and FIG. It is a front view which shows the subject of the terminal crimping structure of the conventional single core electric wire.

  1 to 3 show a first embodiment of a terminal crimping structure of a single core electric wire according to the present invention.

  As shown in FIGS. 1A and 1B, the single core wire 2 made of conductive metal of the single core electric wire 1 has a plurality of concave and convex shapes (concave and convex portions) 5 on the outer periphery. The concavo-convex shape 5 may be formed over the entire length of the single core wire 2 (also inside the insulating coating 6), and the insulating coating 6 made of synthetic resin is peeled and exposed at the end portion of the single core electric wire 1. The concavo-convex shape 5 may be formed only on the exposed portion of the single core wire 2 having a circular cross section (substitute with reference numeral 2). The leading end surface of the single core wire 2 is denoted by reference numeral 2a, and the peeled cut surface of the insulating coating 6 is denoted by reference numeral 6a.

  The concavo-convex shape 5 over the entire length of the single core wire 2 is formed continuously by providing the concavo-convex shape on the inner periphery of the die hole when, for example, the single core wire 2 is drawn through a die hole (not shown). can do. The concavo-convex shape 5 of the exposed portion of the single core wire 2 can be formed by a forming process by a not-shown press or rolling.

  The press machine uses an uneven shape formed on the inner circumference of each semicircular groove of the upper and lower molding dies. Instead of the press machine, a roll formed with a concave / convex shape for splines or serrations on the outer periphery of a pair of cylindrical dies for rolling may be used. Forming the concavo-convex shape 5 on the single core wire 2 by these means is called forming processing.

  In this example, the concavo-convex shape 5 includes, for example, a plurality of inverted V-shaped protrusions (ridges or ridges) 4 and a plurality of V-shaped recesses (valleys or grooves) between the protrusions 4. 3. The convex part 4 has a pair of inclined surface 4a, and the recessed part 3 is comprised inside the opposing inclined surface 4a. The uneven shape 5 is continuously formed at an equal pitch over the entire circumference of the single core wire 2. The single core wire 2 is formed using aluminum or copper as a material. The concave-convex shape 5 is equal to the contact pressure with the terminal described later (preventing a partial decrease in contact pressure) in the single-core wire 2 made of copper which is inferior to copper as well as the single-core wire 2 made of copper. Demonstrate the effect of.

  As shown in FIGS. 2A and 2B, the terminal 7 of this example is an existing terminal having a female electrical contact portion 8 in the first half and a core crimping portion 9 in the second half. Instead of the female electrical contact portion 8, a terminal having a male electrical contact portion (not shown) is also applicable. The core wire crimping portion 9 is an existing one composed of a curved bottom plate portion 10 and a pair of left and right crimping pieces 11 raised from the bottom plate portion 10 in a tapered shape obliquely upward.

  The single core wire 2 that is the conductor portion of the single core electric wire 1 is set on the inner side of the core wire crimp portion 9 of the terminal 7, and the tips (upper ends) 11 b ′ of the pair of crimp pieces 11 are insulated from the outer periphery of the single core electric wire 1. It protrudes above the coating 6 and is located. The bottom plate portion 10 of the core wire crimping portion 9 is disposed on an anvil (not shown) that is a lower crimping jig, and a crimper (not shown) that is an upper crimping jig is positioned above the pair of crimping pieces 11. The anvil has a curved surface for receiving the bottom plate portion 10, and the crimper is an existing one having a terminal pressing groove having a substantially horizontal 3 (substantially M) shape. The crimper descends together with the ram (not shown) toward the anvil. The ram is moved up and down by a cylinder and a motor (not shown).

  By lowering the crimper (upper die) from the set state of FIGS. 2 (a) and 2 (b), the concavo-convex shape 5 on the outer periphery of the single core wire 2 is crushed as shown in FIGS. 3 (a) and 3 (b). The core wire crimping portion 9 of the terminal 7 is crimped and connected in a substantially horizontal B shape (substantially glasses shape).

  The concave-convex shape 5 on the outer periphery of the single core wire 2 has an excessive pressing load on the concave portion 3 by causing the inner wall portion of the core wire crimping portion 9 of the terminal 7 to protrude into the concave portion (concave groove) 3 during crimping. While absorbing (stress), the convex part (mountain part) 4 is compressed and crushed in the electric wire radial direction, and press-contacts closely to the inner peripheral surface of the core wire crimping part 9 of the terminal 7 without a gap. As a result, the single core wire 2 is pressed and adhered with uniform contact pressure over the entire inner circumference of the core wire crimping portion 9, and the core wire crimping portion 9 and the single core wire 2 creep and the spring in the diameter increasing direction of the core wire crimping portion 9. A partial decrease in contact pressure due to the back is prevented.

  That is, as shown in FIG. 3B, the distal end portions 11b of the pair of left and right crimping pieces 11 of the core crimping portion 9 are downward (inward) by the pressing force of the portion projecting downward in the center in the width direction of the crimper (not shown). Is folded into the upper part of the single core wire 2 (part indicated by reference symbol A). At this time, a pair of crimping pieces 11 are provided in the concave portions (concave grooves) 3 of the concave and convex shape 5 on the outer periphery of the single core wire 2. The wall surface of the downward leading end portion 11b enters while being deformed in a convex shape, and each concave portion 3 absorbs an excessive pressing force (crimping force or stress) by the downward leading end portion 11b, while the upper outer periphery of the single core wire 2 The convex portions 4 of the concavo-convex shape 5 are crushed in the radial direction of the wire, and are elastically pressed into close contact with the distal end portion 11b of each crimping piece 11 and the vicinity thereof (the portion indicated by symbol A). Thereby, the contact pressure of the core wire crimping part 9 of the terminal 7 in the code | symbol A part and the single core wire 2 falls rather than before (A part of FIG.6 (b)).

  Further, the single core wire 2 is pressed downward by the tip portions 11b folded downward of the pair of crimping pieces 11, and comes into strong contact with the horizontally long large-diameter curved bottom plate portion 10 of the core wire crimping portion 9. Further, the inner wall portion 10a of the bottom plate portion 10 enters a convex shape into each concave portion 3 of the concave-convex shape 5 on the lower side of the single core wire 2, and the single core wire 2 absorbs an excessive pressing force while the concave portion 3 absorbs an excessive pressing force. Each convex part 4 of the concave-convex shape 5 on the lower side of the outer periphery is crushed in the electric wire radial direction, and is elastically pressed into close contact with the inner wall surface 10a of the bottom plate part 10 of the core crimping part 9 (part indicated by reference numeral B). Thereby, the contact pressure of the core wire crimping part 9 of the terminal 7 in the code | symbol B part and the single core wire 2 falls rather than before (B part of FIG.6 (b)).

  As a result, a decrease in contact pressure over time due to the conventional creep or the like in the A portion and the B portion (FIG. 7) is prevented, and the core wire crimping portion 9 and the core wire portion 2 of the terminal in the A portion and the B portion become the C portion. The contact is made with the same uniform contact pressure as in the other parts including. Therefore, an increase in electrical contact resistance between the terminal 7 and the single core wire 2 is prevented, and the reliability of electrical connection is improved.

  C part is a position including the substantially vertical wall part 11c of a pair of crimping pieces 11, and the single core wire 2 compressed in the vertical direction extends so as to spread in the lateral (left and right) direction, and the left and right unevenness of the single core wire 2 Each convex part 4 of the shape 5 is elastically pressed and adhered to the inner surface 11a of the substantially vertical part 11c of the pair of crimping pieces 11 of the C part while being crushed in the radial direction of the electric wire.

  Since the C part is a part where the contact pressure is low in the prior art (C part in FIG. 6B), there is little concern about a decrease in the contact pressure due to creep or the like, but each convex part of the left and right uneven shape 5 of the single core wire 2 The contact pressure is satisfactorily exerted by elastically pressing the inner surface 11a of the substantially vertical portion 11c of the pair of crimping pieces 11 of the C portion while 4 is crushed in the electric wire radial direction. The contact pressure between the core wire crimping part 9 and the single core wire 2 in the A part, the B part, and the C part is made substantially uniform (almost equal).

  For example, it is also possible to eliminate the concave / convex shape 5 only in the C portion and to form a gently curved outer peripheral surface having the same height (outer diameter) as the convex / concave portion 4 of the concave / convex shape 5 in the upper and lower sides (A portion and B portion). However, in the work of setting the electric wire 1 to the terminal 7, it takes time and effort to position the uneven shape 5 of the single core wire 2 up and down by visual observation or the like.

  As shown in FIG. 3 (a), the wire crimping portion of the terminal 7 of this example is only the core wire crimping portion 9, but an insulation coating crimping piece (not shown) protruding higher than the core wire crimping piece 9 behind the core wire crimping portion 9. It is also possible to integrally provide an insulation coating crimping portion having

  The concave / convex shape 5 in FIG. 1 has the concave portions 3 and the convex portions 4 arranged radially and finely. However, the concave / convex shape 5 is formed larger (coarse) than in FIG. You may arrange | position at about 10 to 10 pitches. Moreover, the shape of the convex part 4 is not limited to a substantially V shape with a sharp top, but may be a substantially trapezoidal or rectangular shape with a flat top (in this case, the concave part 3 has an inverted trapezoidal or inverted rectangular shape). Become).

FIG. 4 shows a second embodiment of a terminal crimping structure for a single core electric wire according to the present invention, in which the concavo-convex shape 16 of the single core wire 13 is formed into a screw shape. Other configurations (terminals and crimped state) are the same as those in FIGS.

The uneven shape 16 in the example of FIG. 4 is a male screw shape, and the single-core wire 13 is exposed by peeling off the insulating coating 6 at the end of the single-core electric wire 12 , and the exposed single-core wire portion 13 is threaded by rolling or the like. Molding shape. It is also possible to preliminarily form the screw shape 16 over the entire length of the single core wire and attach the insulating coating 6 to the single core wire 13 of the screw shape 16. In that case, a short straight portion (non-rollable portion) 13b having a circular cross section between the screw-shaped portion 16 and the insulating coating 6 is also a screw-shaped portion.

  The screw-shaped irregularities 16 are formed in a spiral shape in the longitudinal direction of the single core wire 13. The concave portion 14 of the concavo-convex shape 16 is a valley portion or a concave groove, and the convex portion 15 is a mountain portion or a convex line. The front end surface of the single core wire is denoted by reference numeral 13a, and the peeled cut surface of the insulating coating 6 is denoted by reference numeral 6a.

  The screw direction of the screw-shaped portion 16 may be right-handed or left-handed. Instead of the screw shape 16, a plurality of annular convex portions (ridges or ridges) and concave portions (valleys or grooves) (not shown) can be alternately arranged in the longitudinal direction of the single core wire 13. This uneven shape is positioned orthogonal to the axial direction of the single core wire 13. In this case, a plurality of annular concavo-convex shapes can be formed by pressing. In the embodiment of FIG. 1, the irregularities 5 are alternately arranged in the circumferential direction of the single core wire 2, whereas the screw-shaped irregularities 16 and the plurality of annular irregularities in FIG. Alternately arranged.

  These screw-shaped irregularities 16 and annular irregularities are crimped and connected at the core crimping portion 9 of the terminal 7 from the set state to the terminal 7 as in FIG. 2, as in FIG. b) The core wire crimping portion 9 protrudes into the concave portion (valley portion or concave groove) 14 of the concavo-convex shape 16 in the A portion and the B portion, and the concave portion 14 absorbs excessive pressing force of the crimper and the anvil. On the other hand, the convex part (mountain part or convex line) 15 is crushed in the single-core wire radial direction, and the contact pressure between the pair of crimped pieces 11 of the terminal 7 folded back and the bottom plate part 10 on the lower side is uniform and good. The convex portion 15 is crushed in the diameter direction of the single core wire at the C portion, and is elastic to a substantially vertical portion 11c of the pair of crimping pieces 11 with a uniform and good contact pressure similar to the A portion and the B portion. Touch.

  This prevents a decrease in contact pressure over time due to conventional creep or the like in the A part and the B part, that is, an increase in electrical contact resistance, and improves the reliability of electrical connection.

  Note that the concave / convex shape 16 of the single core wire 13 in FIG. 4 has the concave portions 14 and the convex portions 15 arranged at a small pitch, but the pitch between the convex portions 15 is larger than in FIG. It is also possible to make the recess 14 wider than the width of the portion 15. In addition, the shape of the convex portion 15 is not limited to a substantially inverted V shape with a sharp tip (top), but may be a flat top trapezoidal shape or a rectangular shape (in this case, the concave portion is V-shaped. (No reverse trapezoidal shape or reverse rectangular shape).

  FIGS. 5A to 5C show a third embodiment of a terminal crimping structure for a single-core electric wire according to the present invention.

  In this terminal crimping structure, the insulation coating 6 at the end of the existing single-core electric wire 21 in FIG. 5A is peeled off to expose the single-core wire 22, and the exposed single-core wire 22 is exposed as shown in FIG. In the center in the radial direction, a longitudinal slit 23 is cut out from the front end surface 22a of the single core wire 22 in the longitudinal direction of the single core wire, and a pair of left and right halved (substantially semicircular) single core wires ( A single-core wire) 22 'is constructed.

  In Fig.5 (a), the front end surface of the single core wire 22 is shown with the code | symbol 22a, and the peeling cut surface of the insulation coating 6 is shown with the code | symbol 6a. The slit 23 in FIG. 5B is formed to have a length comparable to the stripping length of the insulating coating 6 (exposed length of the single core wire 22). The slit 23 is cut and formed by, for example, a disk-shaped rotary cutter. When forming the slit 23 with a die or the like when forming the single core wire 22 through the die hole, the insulating coating 6 is filled in the slit 23 so that the pair of single core wire portions 22 'are not separated from each other. It is necessary to join.

  1 is formed on the outer periphery of the exposed single-core portion 22 ′, the spline-like uneven shape 5 of FIG. 1, the screw shape 16 of FIG. 4 or a plurality of annular uneven shapes not shown, as shown in FIG. A pair of single core wire portions 22 ′ are crimped and connected separately (individually) by a pair of left and right crimping pieces 11 of the core wire crimping portion 9 of the terminal 7 ′.

  As shown in FIG. 5C, the tip portions 11b folded downward from the pair of crimping pieces 11 enter the slit 23 while facing the upper opening 23a of the slit 23 between the pair of single core wire portions 22 ′. Thus, the interference between the upper part of the single core wire 22 of FIG. 5A and the tip part 11b folded downward of the pair of crimping pieces 11 (the tip part 11b folded downward of the pair of crimping pieces 11 is a single core wire) 6, that is, the slit 23 absorbs an excessive pressing force of the folded end portion 11 b, thereby preventing an excessive stress load in the conventional portion A of FIG. 6B. In addition, an excessive stress load on the B portion due to an excessive pressing force on the A portion is prevented at the same time.

  This effect is exhibited even when the concave and convex shape is not provided on the outer periphery of the single core wire 22, but the concave and convex shapes 5 and 16 (FIGS. 1 and 4) are provided on the outer periphery of the single core wire 22 or each single core wire portion 22 ′. Thus, the effect is further promoted.

  That is, when the tip portion 11b folded back downward on each crimping piece 11 is strongly pressed against the upper portion 22a ′ of the single-core wire portion 22 ′ on both the left and right sides of the slit 23, the uneven shape 5 on the upper portion of the single-core wire portion 22 ′. 16 (FIGS. 1 and 4), the tip portion 11b folded back into the concave portions 3 and 14 enters into a convex shape, and the concave portions 3 and 14 absorb the excessive pressing force of the folded tip portion 11b. On the other hand, the convex portions 4 and 15 are crushed in the single core wire radial direction and elastically pressed and adhered to the inner surface of the crimping piece 11 with a good contact pressure.

  Further, each single core wire portion 22 ′ is strongly pressed downward by the folded end portion 11b of each crimping piece 11, so that the single core wire portion 22 ′ is applied to the horizontally long bottom plate portion 10 of the core wire crimping portion 9 of the terminal 7 ′. In this case, the bottom plate portion 10 enters the concave portions 3 and 14 of the concave and convex shapes 5 and 16 of the lower portion 22b ′ of the single core wire portion 22 ′ into the convex portions, 14 absorbs an excessive pressing force of the bottom plate portion 10, and the convex portions 4 and 15 are crushed in the single-core wire radial direction and elastically press-contact with the inner surface of the bottom plate portion 10 with a good contact pressure.

  In addition, you may perform uneven | corrugated shape 5,16 in the single core wire 22 in the state which exposed the single core wire 22 of Fig.5 (a). In that case, after forming the concavo-convex shapes 5 and 16, the slit 23 of FIG. In addition, after forming the slits 23 in FIG. 5B, when forming the concave and convex shapes 5 and 16 on the left and right single core wire portions 22 ′, the concave and convex shapes 5 and 16 are also formed on the inner surface of the slit 23 by pressing or the like. Is possible. Further, the slits 23 are not limited to a single vertical shape, and may be formed in two vertical and horizontal crosses, for example. In this case, it is preferable to provide the uneven shapes 5 and 16 in FIG.

  Moreover, the slit 23 does not necessarily have to penetrate in the radial direction. For example, the longitudinal slit (23) may be provided only in the upper half of the single core wire 22 in FIG. Even in that case, the front end portions 11b of the pair of crimping pieces 11 folded back at the time of crimping enter the upper opening 23a of the slit (23) while facing each other.

  As shown in FIG. 5C, the terminal 7 'has a core wire crimping portion 9 and an insulation coating crimping portion 17 behind the core wire crimping portion 9. The core wire crimping portion 9 and the insulation coating crimping portion 17 are separately provided on the upper side (not shown). The front and rear crimpers are simultaneously crimped together with a lower integral or separate anvil (not shown), and the insulating coating crimping portion 17 is crimped and fixed to the insulating coating 6 of the electric wire 21.

  In the third embodiment of FIG. 5, both the slit 23 and the concave and convex shapes 5 and 16 are formed in the single core wire 22. For example, as the fourth embodiment, only the slit 23 is provided in the single core wire 22. It is also effective to omit the uneven shape.

  Also in this case, the slit 23 is notched in the longitudinal direction through the center in the radial direction of the single core wire 22, and has an upper and lower opening 23 a and a front opening, and is folded downwardly when the terminal is crimped. The upper opening 23a of the slit 23 is opposed to the distal end portion 11b, and the distal end portion 11b of each crimping piece 11 enters the slit 23 from the upper opening 23a, so that an excessive pressing force of the distal end portion 11b of each crimping piece 11 is generated. It is escaped (absorbed) by the slit 23, and an excessive stress load on the single core wire 22 is prevented. The slit 23 may be formed only in the upper half of the single core wire 22.

  Further, in each of the above embodiments, the concave and convex shapes such as the serration shape 5, the screw shape 16, and a plurality of loops are formed by forming processing. It is also possible to provide a bottomed hole portion as a concave portion, and to form a plurality of convex portions on the outer peripheral surface between the respective hole portions (recess portions). This recess is formed by pressing or rolling.

  Moreover, in each said embodiment, although the insulation coating 6 of the single core electric wires 1, 12, and 21 was formed on the outer side of the single core wires 2, 13, and 22, the single core wires 2 and 13 which do not provide an insulation coating, for example , 22 and terminals 7 and 7 'are crimped, and the insulation coating 6 can be formed by resin formation after terminal crimping, or can be formed by winding an insulating tape or through an insulating tube to form a single-core electric wire.

  Moreover, in each said embodiment, although the terminals 7 and 7 'which have the core wire crimping part 9 containing a pair of crimping piece 11 were used, instead of a pair of crimping piece 11, the terminal which has a cylindrical core wire crimping part, for example In the state where a single core wire is inserted into the cylindrical core wire crimping portion and the cylindrical core wire crimping portion is crimped to the single core wire, various irregular shapes 5 are formed on the single core wires 2, 13, 22 ′. When the single-core electric wires 1, 12, and 21 provided with 16 and slits 23 are applied, the cylindrical core wire crimping part is pressed in the direction of diameter reduction by the circular or hexagonal pressing grooves of the upper and lower crimping jigs. Variation in the circumferential direction of the single core wire (excessive pressing force) can be absorbed by the concave and convex shapes 5 and 16 and the slit 23 to make the contact pressure uniform and prevent an increase in electrical contact resistance.

  In addition, the configuration described in each of the above embodiments may be used as a terminal crimping structure for a single core electric wire, a terminal processing method for a single core electric wire, a terminal crimping method for a single core electric wire, etc. It is effective.

  The terminal crimping structure of the single core electric wire according to the present invention is a partial connection between the single core wire and the terminal by creep or the like when the terminal is crimped and connected to a single core wire such as a thick aluminum wire for vehicles including electric vehicles. Therefore, it can be used to prevent an increase in electrical contact resistance.

1,12,21 Single-core wire 2,13,22 Single-core wire 3,14 Recess (concave groove)
4,15 Convex (ridge)
7, 7 'terminal 9 core wire crimping part 11 crimping piece 11b tip part 22' single core wire part (single core wire)
23 Slit

Claims (4)

A single-core electric wire terminal crimping structure in which a plurality of concave portions and convex portions are provided on the outer periphery of a single core wire made of conductive metal, and a core wire crimping portion of a terminal is crimped and connected to the single core wire having the plural concave portions and convex portions. There,
Wherein the single core wire, single core wire longitudinal direction of the slit is provided from the distal end surface of the single core wire, folded tip of the pair of crimping pieces of the crimping portion into the slit in the crimped state of the crimping portion A terminal crimping structure for a single-core electric wire characterized by entering.   The terminal crimping structure for a single core electric wire according to claim 1, wherein the plurality of concave portions and convex portions are concave grooves and convex strips extending in a longitudinal direction of the single core wire.   The terminal crimping structure of a single core electric wire according to claim 1, wherein the plurality of concave portions and convex portions are concave grooves and convex strips extending in a circumferential direction of the single core wire. A single core wire made of conductive metal is provided with a slit in the longitudinal direction of the single core wire from the front end surface of the single core wire, the single core wire is divided in the single core wire radial direction by the slit, and includes a pair of crimp pieces of terminals. A terminal crimping structure for a single-core electric wire, characterized in that the folded tip ends of the pair of crimping pieces enter the slit in a state in which the section is crimped to the single-core wire.

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