JP6291182B2 - Crimp terminal - Google Patents

Description

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

  Conventionally, as shown in FIG. 6A, as a terminal fitting to be attached to the tip of the electric wire JW, a crimp terminal C provided with a crimp part V for crimping a conductor DW with a sheath removed is often used.

  Specifically, the crimp terminal C includes a connection portion disposed on the distal end side in the longitudinal direction and an electric wire connection portion disposed on the proximal end side. This electric wire connection part is provided with the crimping | compression-bonding part V which crimps | bonds the conductor DW of the electric wire JW. The crimping portion V includes a crimping bottom surface VC on which the conductor DW is placed, and crimping pieces VA and VB called wire barrels extending from both sides in the width direction of the crimping bottom surface VC.

  The crimp terminal C configured as described above has a connection portion V and a conductor DW formed by crimping the conductor DW placed on the crimp bottom surface VC with a pair of crimp pieces VA and VB as shown in FIG. Can be electrically and mechanically connected.

  Normally, in the connection between the crimp terminal C and the conductor DW, when the conductor DW is crimped and connected to the crimp terminal C, a crimp shape in which the end surfaces of the pair of crimp pieces VA and VB are cut into the conductor DW side is adopted. Was.

  Refer to FIGS. 7A, 7B, and 7C. The crimp terminal C and the electric wire JW are viewed from the longitudinal direction. When the conductor DW of the electric wire JW is crimped with the punch JP and the die JD as shown in FIG. 7 (a), a pair of crimping pieces VA and VB (see FIG. 6 (a)) as shown in FIG. 7 (b). Is crimped to the conductor DW. When attention is paid to the area ER4 shown in FIG. 7C, it can be seen that the crimping pieces VA and VB are biting into the conductor DW.

  Moreover, as shown in FIG. 8, a strip plating (pre-plating) material may be employed. In this case, the H portion which is the fracture surface is not plated.

  For example, Patent Document 1 and Patent Document 2 can be listed as the conventional techniques.

JP 2009-245700 A JP 2009-224120 A

  The end face of the pair of crimping pieces VA and VB has a crimped shape in which the end surfaces of the pair of crimping pieces VA and VB are cut into the conductor DW side.

  There was a problem that the conductors were cut off by the end faces of the crimping pieces VA and VB, and the performance (electrical / mechanical performance) of the crimping part V was lowered.

  Further, when the strip plating (pre-plating) material is adopted, there is a problem that the end surface of the crimping portion V becomes a press fracture surface and is easily corroded because of the non-plated surface, and the performance of the crimping portion is deteriorated due to conductor corrosion. Furthermore, there has been a problem that the pressure-bonding pieces VA and VB are opened.

  When a fire prevention sheet or the like is sandwiched between terminals and conductors as a measure for preventing corrosion of aluminum wires, there is a problem that the sheet is damaged by the tip of the crimping part.

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

According to the first aspect of the present invention, the wire connection portion of the crimp terminal includes a crimp portion for crimping the conductor of the wire, and the crimp portion includes a bottom plate on which the conductor is placed on an upper surface, and both side edges in the width direction of the bottom plate. A pair of crimping pieces extending upward from the pair, and the pair of crimping pieces are bent inward so as to wrap the conductor placed on the bottom plate by caulking, and are crimped and connected to the conductor. the curved shape protruding to the conductor side at each crimping piece together when crimping pieces crimped connected to the conductor is formed of the ends of the respective crimping pieces are hidden from biting state with respect to the conductor When the crimping connection is made to the conductor, the pair of crimping pieces form a continuous curved shape in the vicinity of the ends facing each other, and each end surface of the pair of crimping pieces is Orthogonal to the width direction, The dimension between the end faces of the pair of crimping pieces is smaller than the dimension of the thickness of the crimping piece, and in the height direction, the dimension at each end of the pair of crimping pieces The dimension between the crimping piece and the bottom plate is larger than the dimension between the crimping piece and the bottom plate at a predetermined portion facing the bottom plate away from the ends of the pair of crimping pieces. It is a crimp terminal that is getting smaller.

According to the second aspect of the present invention, when the crimping connection is made to the conductor, the height dimension of the pair of crimping pieces at the end surfaces of the pair of crimping pieces and the end portions of the pair of crimping pieces The difference value between the height dimension of the pair of the crimping pieces at a position where the height dimension is at a maximum from the location is smaller than the thickness dimension of the crimping piece. This is a crimp terminal.

According to a third aspect of the present invention, when the pair of crimping pieces try to open due to a rotational moment about a predetermined axis extending in the longitudinal direction of the conducting wire, the ends of the pair of crimping pieces interfere with each other. The crimp terminal according to claim 1, wherein the crimp opening is suppressed .

The invention according to claim 4, the curved portion claims 1 suppresses interference opening to the conductor of the pair of the crimping pieces when attempting to open a pair of the crimping pieces in the width direction The crimp terminal according to any one of 3 above.

  Since the crimping piece of the crimping part does not bite into the conductor, it is possible to suppress an increase in resistance and a decrease in mechanical performance due to the conductor being cut, and an effect of improving electrical connectivity and mechanical connectivity can be achieved.

  In addition, when a fireproof sheet or the like is sandwiched between terminals and conductors as a countermeasure for preventing corrosion of the aluminum electric wire, there is an effect that damage to the sheet due to the tip of the crimping portion can be prevented.

  Furthermore, there is an effect that it is possible to suppress the crimping portion opening (conductor tightening loosening) after crimping. For example, since the crimping piece is curved to the conductor side, the left and right crimping piece interference, and the crimping piece and conductor interference can prevent the crimping portion from opening.

It is explanatory drawing explaining a crimp terminal with a perspective view. It is explanatory drawing explaining the manufacturing process of a crimp terminal. It is explanatory drawing explaining the manufacturing process of a crimp terminal. It is explanatory drawing explaining the effect | action of a crimp terminal. It is explanatory drawing explaining the effect | action of a crimp terminal. (A), (b) is a prior art figure explaining a prior art. (A), (b), (c) is a prior art figure explaining a prior art. It is a prior art explaining a prior art.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a configuration 1 of a manufacturing process and a crimp terminal 10 manufactured by the manufacturing process. 2 and 3 show the manufacturing process of the crimp terminal 10. 4 and 5 show the operation of the crimp terminal 10.

  Please refer to FIG. The crimping terminal 10 manufactured by the configuration 1 of the manufacturing process is connected to the crimping part 20 that crimps the insulation coating 51 of the electric wire 50 and the crimping part 30 that crimps the conductor 52 of the electric wire 50 (the crimping part 20 and the crimping part 30 connect the electric wire). Part). Furthermore, the connection part 40 connected to another terminal (illustration omitted) is provided.

  The crimping portion 30 for crimping the conductor 52 includes a bottom plate 33 for placing the conductor 52 on the upper surface and a pair of crimping pieces 31 and 32. The bottom plate 33 and a pair of crimping pieces 31 and 32 extending upward from both side edges of the bottom plate 33 are formed in a U shape.

  The pair of crimping pieces 31 and 32 are bent inward so as to wrap the conductor 52 placed on the bottom plate 33 by crimping of the punch P and the die D, and are crimped and connected to the conductor 52.

  That is, the punch P moves in the direction of the arrow AR1 from above the crimp terminal 10 placed on the die D, contacts and pressurizes the crimp portion 30, and the pair of crimp pieces 31 and 32 are crimped to form the conductor 52. The crimping part 30 is crimped, and the crimping part 30 and the conductor 52 are electrically and mechanically crimped and connected.

  The electric wire 50 is formed by covering the conductor 52 made of aluminum or aluminum alloy with an insulating coating 51, and the conductor 52 exposed by peeling off the end of the electric wire 50 is fixed to the crimping portion 30 by crimping. The The insulating coating 51 is fixed to the crimping part 20.

  In this example, as a characteristic part, when the pair of crimping pieces 31 and 32 crimps the conductor 52, a crimped shape that does not bite into the conductor 52 (a crimped shape in a non-biting state) is formed.

  The crimping shape that does not bite into the conductor 52 will be described in detail. When a pair of the crimping pieces 31 and 32 are crimped and connected to the conductor 52, the crimping shape is projected and curved toward the conductor 52 near the ends of the pair of the crimping pieces 31 and 32 facing each other. (It is recessed on the bottom plate 33 side).

  This curved shape is smoothly continuous in the vicinity of each of the crimping pieces 31 and 32 (the planar end surface of the crimping piece 31 and the planar end surface of the crimping piece 32 may be in contact with each other. Since the planar end surface of the piece 31 and the planar end surface of the crimping piece 32 are parallel to each other and a slight gap may be formed between them, the crimping piece 31 is formed on the conductor 52. , 32 does not bite into the end. Furthermore, since force is evenly applied to the curved surface, it does not bite into the conductor 52.

  The planar end face of the crimping piece 31 and the planar end face of the crimping piece 32 are parallel to each other, and a slight gap is formed between them. 32 planar end faces may be in contact with each other.

  In addition, when the curved shape cannot be formed by a single process, it is formed by two or more processes. For this reason, a curved shape can be formed reliably.

  Please refer to FIG. 2 and FIG. Here, the pressure-bonding pieces 31 and 32, the pressure-bonding pieces 31A and 32A, and the pressure-bonding pieces 31B and 32B are properly used for each shape. Furthermore, the conductor 52, the conductor 52A, and the conductor 52B are properly used for each shape.

  As described above, when the same line 52 cannot be crimped by a single caulking (when the curved shape cannot be formed), it is once processed into a non-curved shape as shown in FIG. As shown, it is formed into a curved shape. For this reason, a curved shape is reliably formed.

  That is, as shown in FIG. 2, when the punch PB (a punch PB having a flat tip) moves from the direction of the arrow AR2 to the die D, the crimping pieces 31 and 32 extending in both directions from the bottom plate 33 (33A) are added. Form by tightening. Here, as a 1st process, flat shape is shape | molded in the vicinity which pressure bonding piece 31A, 32A opposes.

  Subsequently, as shown in FIG. 3, the conductor 52 placed on the die D is clamped by moving the punch P (the punch P whose tip is curved unlike the punch PB in the first step) in the direction of the arrow AR3. To form a crimped shape.

  Thus, the protruding portion corresponding to the dimension A is formed in a curved shape in the vicinity extending from the bottom plate 33 (33B) in both directions and facing the end portions of the crimping pieces 31B and 32B. For this reason, since the front-end | tip part of the crimping | compression-bonding part 30 does not bite into the conductor 52B, the resistance rise by a conductor cut | disconnection and the mechanical performance fall can be suppressed, and the crimp terminal which can improve electrical connectivity and mechanical connectivity is obtained. There is an effect that can be. Further, when a fireproof sheet or the like is sandwiched between the terminal C and the conductor 52B as a measure for preventing corrosion of the aluminum electric wire, there is an effect that it is possible to prevent the sheet from being damaged by the tips of the crimping pieces 31B and 32B of the crimping part 30B.

  Please refer to FIG. As described above, the crimping shape is curved. When the pair of pressure-bonding pieces 31B and 32B is about to open in the vertical direction (in this example, when viewed from the paper, it corresponds to the vertical direction with respect to the paper), the pair of pressure-bonding pieces 31B and 32B interfere with each other to prevent the opening.

  That is, the crimping piece 31B slightly moves in the direction of the arrow AR4 due to elasticity (assuming that it has moved to the crimping piece 31B ′ shown by the two-dot chain line), and the crimping piece 32B slightly moves in the direction of the arrow AR5 due to elasticity. (Assuming that it has moved to the crimping piece 32B ′ shown by the two-dot chain line), as shown by the area ER1, the corner of the end of the crimping piece 31B ′ and the end of the crimping piece 32B ′ Opening in the vertical direction is prevented by interference from one corner.

  Please refer to FIG. When the pair of crimping pieces 31B and 32B is about to open in the horizontal direction (in this example, when viewed from the paper, it corresponds to the left-right direction with respect to the page), the pair of crimping pieces 31B, The shape 32B interferes with the conductor 52B and suppresses the opening.

  That is, the crimping piece 31B moves slightly in the direction of the arrow AR6 due to elasticity (assuming that it has moved to the crimping piece 31B ″ shown by the two-dot chain line), and the crimping piece 32B slightly moves in the direction of the arrow AR7 due to elasticity. When moved (assumed to have moved to the crimping piece 32B ″ indicated by the two-dot chain line), as shown by the areas ER2 and ER3, respectively, one corner of the curved portion of the crimping piece 31B ″ and the conductor 52B Interfere. On the other hand, one corner of the curved portion of the crimping piece 32B ″ interferes with the conductor 52B to prevent horizontal opening.

  The present invention is not limited to the embodiments of the invention described above, and can be implemented in other modes by making appropriate modifications.

1 Structure of production process 10 Crimp terminal 20 Crimp part (wire connection part)
30 Crimp part (wire connection part)
31 Crimping piece 32 Crimping piece 33 Bottom plate 40 Connection part 50 Electric wire 51 Insulation coating 52 Conductor P Punch D Die

Claims (4)

The wire connection portion of the crimp terminal includes a crimp portion for crimping the conductor of the wire, and the crimp portion includes a bottom plate on which the conductor is placed on an upper surface, and a pair of crimp pieces extending upward from both side edges in the width direction of the bottom plate. The pair of crimping pieces are bent inward so as to wrap the conductor placed on the bottom plate by caulking, and are crimped and connected to the conductor.
When a pair of the crimping pieces are crimped and connected to the conductor, a curved shape projecting toward the conductor is formed between the crimping pieces, and the end portions of the crimping pieces are not digging into the conductor. And
When crimped and connected to the conductor, the pair of crimping pieces form a continuous curved shape in the vicinity where their respective ends face each other, and each end surface of the pair of crimping pieces has the width The dimension between the end faces of the pair of crimping pieces in the width direction is smaller than the thickness dimension of the crimping piece, and in the height direction, The dimension between the crimping piece and the bottom plate at each end of the crimping piece is separated from each end of the pair of crimping pieces and is opposed to the bottom plate at the predetermined portion. A crimp terminal having a size smaller than a dimension between the crimp piece and the bottom plate . When crimped and connected to the conductor, the height dimension of the pair of crimping pieces at the end faces of the pair of crimping pieces and the height dimension away from the end portions of the pair of crimping pieces are 2. The crimp terminal according to claim 1 , wherein a value of a difference from a height dimension of the pair of crimp pieces at a maximum is smaller than a thickness dimension of the crimp pieces . When a pair of the crimping pieces try to open by a rotational moment about a predetermined axis extending in the longitudinal direction of the conducting wire, the ends of the pair of crimping pieces interfere with each other to suppress the opening. The crimp terminal according to claim 1 or 2 . The curved portion of the pair of crimping pieces interferes with the conductor and suppresses the opening when the pair of crimping pieces is about to open in the width direction . The crimp terminal according to item 1 .

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