JP2015041404A - Electric wire with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further suppress increase in cost of manufacture and to enhance the water cutoff performance of an electric wire with a terminal without affecting electrical characteristics of the electric wire with a terminal.SOLUTION: An electric wire 1 with a terminal comprises: an insulation electric wire 9; a crimp terminal 10 having a coated crimp part 20 and a core wire crimp part 40; and a water cutoff resin part 7. In the electric wire 1 with a terminal, the coated crimp part 20 has a bottom plate part 21 and two coating caulking parts 22. In the coated crimp part 20, a recessed part 25 recessed to the insulation electric wire 9 side by being crimped stronger by an insulation coating 920 than the other part, is formed in series at least from a part of one of the two coating caulking parts 22 to a part of the other of the two coating caulking parts 22 via the bottom plate part 21.

Description

  The present invention relates to an electric wire with a terminal including an insulated wire, a crimp terminal attached to the insulated wire, and a water stop resin portion for water stop.

  In a wire harness mounted on a vehicle such as an automobile, a crimp terminal is attached to an end of an insulated wire. The crimp terminal is in direct contact with the mating terminal at the end of the insulated wire, the core crimped portion crimped to the core wire extending from the insulation coating at the end of the insulated wire, and the counterpart terminal. A contact portion connectable to the terminal on the side. Hereinafter, an insulated wire having a crimp terminal attached to the end is referred to as a terminal-attached wire.

  In the terminal-attached electric wire, the cover crimp portion of the crimp terminal includes a bottom plate portion and a pair of caulking portions that are continuous with the core wire crimp portion side portion along the longitudinal direction of the insulated wire. The pair of caulking portions are connected to the bottom plate portion, are erected from the bottom plate portion to both sides of the insulated wire, and are bent to a position facing the bottom plate portion with the insulated wire interposed therebetween.

  In general, the crimp terminal is a metal member mainly composed of copper.

  In a terminal-attached electric wire, when the core wire of the insulated wire is an aluminum wire, a different metal contact corrosion is likely to occur due to, for example, liquid entering the joint between the core wire of the insulated wire and the crimp terminal. In order to prevent foreign metal contact corrosion, for example, a countermeasure is taken such that the joint portion between the core wire of the insulated wire and the crimp terminal is covered with a synthetic resin for water stoppage.

  However, due to the difference between the cross-sectional shape of the insulated wire and the cross-sectional shape of the coated crimping portion of the crimp terminal, there is a slight gap between the outer peripheral surface of the insulating coating in the insulated wire and the inner surface of the coated crimped portion of the crimp terminal. Prone to occur. In particular, this gap is likely to occur at the bent portion at the boundary between the bottom plate portion and each of the pair of caulking portions in the coated crimping portion.

  The above-described gap generated between the coated crimping portion and the insulating coating serves as a liquid intrusion path. Therefore, although the surface of the joint portion is covered with the water stopping resin, the joint portion between the core wire and the crimp terminal is corroded.

  Therefore, the following measures have been devised for the above problem.

  For example, in the method disclosed in Patent Document 1, a core wire extending from an insulation coating of an insulated wire is coated with an anticorrosion resin, and then a crimp terminal is crimped to the insulated wire.

  Moreover, in the electric wire terminal anticorrosion structure shown by patent document 2, the junction part of the core wire and terminal metal fitting of the insulated wire in an electric wire with a terminal is covered with the mold part which consists of resin obtained by insert molding. The mold part is formed over a wide range that further exceeds the range from the front end of the core wire to the rear end of the terminal fitting.

JP 2011-65995 A JP 2012-03856 A

  The electric wire with a terminal shown in patent documents 1 or patent documents 2 includes the following problems.

  In the electric wire with terminal shown in Patent Document 1, there is a problem that a resin layer formed between the core wire of the insulated wire and the core wire crimping portion of the crimp terminal adversely affects the electrical characteristics of the electric wire with terminal. . More specifically, the problem that the contact resistance between the insulated wire and the crimp terminal is likely to occur. In addition, contact resistance is an electrical resistance between the core wire of an insulated wire and a crimp terminal.

  Moreover, the electric wire with a terminal shown by patent document 2 requires the large amount of resin for shape | molding the mold part over a wide range for the molding apparatus for insert-molding a mold part over a wide range. Therefore, there exists a problem that the manufacturing cost concerning this electric wire with a terminal increases.

  An object of this invention is to suppress the increase in manufacturing cost, without affecting the electrical property of an electric wire with a terminal, and to raise the water stop of an electric wire with a terminal.

  The electric wire with a terminal which concerns on a 1st aspect is provided with an insulated wire, a crimp terminal, and a water stop resin part. The crimp terminal includes a coating crimp portion and a core wire crimping portion that are crimped to each of an insulating coating portion of the insulated wire and a core wire extending from the insulation coating. The water-stopping resin portion is a synthetic resin member that covers a portion exposed from the crimp terminal on the distal end side from a portion that contacts at least the edge of the coated crimp portion on the core crimp portion side of the insulated wire. And the said covering crimping | compression-bonding part has a baseplate part and a pair of caulking part. The said baseplate part is a part which continues to the part by the side of the said core wire crimping part along the longitudinal direction of the said insulated wire. Further, the pair of caulking portions are portions that are connected to the bottom plate portion, are erected from the bottom plate portion to both sides of the insulated wire, and are bent to a position facing the bottom plate portion with the insulated wire interposed therebetween. . And the said crimping | compression-bonding part is formed with the recessed part. The concave portion is formed in a series from at least one part of the pair of caulking parts to the other part of the pair of caulking parts through the bottom plate part, and the other part of the covering crimping part. It is dented to the insulating coating side by being more strongly pressure-bonded to the insulating coating.

  The electric wire with a terminal concerning the 2nd mode is one mode of the electric wire with a terminal concerning the 1st mode. The electric wire with a terminal concerning the 2nd mode WHEREIN: The said recessed part is formed cyclically | annularly over the perimeter of the said coating crimping | compression-bonding part.

  The electric wire with a terminal concerning the 3rd mode is one mode of the electric wire with a terminal concerning either the 1st mode or the 2nd mode. The electric wire with a terminal concerning the 3rd mode WHEREIN: The said recessed part is formed in the intermediate position between the edge part by the side of the said core wire crimping | compression-bonding part in the said coating crimping | compression-bonding part, and the edge part of the other side.

  In each of the above aspects, the concave portion of the coated crimping portion is more strongly crimped than other portions other than the concave portion in the coated crimping portion, and has a shape recessed toward the insulating coating side. Thereby, the inner surface of a recessed part can be closely_contact | adhered to the outer peripheral surface of the insulation coating in an insulated wire.

  The liquid that has entered from between the coated crimping portion and the insulated wire is blocked at the concave portion. Therefore, liquid can be prevented from entering the joint between the core wire and the crimp terminal. In this case, the water stoppage of the terminal-attached electric wire can be increased without affecting the electrical characteristics of the terminal-attached electric wire.

  Further, the concave portion of the coated crimp portion can be formed by a very simple modification in which a convex portion is provided on a part of a mold for crimping the coated crimp portion. Therefore, a large-scale molding apparatus and a large amount of resin are not necessary, and an increase in manufacturing cost of the terminal-attached electric wire can be suppressed.

  From the above, according to each aspect described above, without affecting the electrical characteristics of the terminal-attached electric wire, it is possible to further increase the water stoppage of the terminal-attached electric wire by suppressing an increase in manufacturing cost. It becomes possible.

  In addition, when the entire coated crimped part is crimped to the insulated wire with such a strong force that there is no gap between the coated crimped part and the insulated wire, it is expected that a large load will be applied to the crimping machine used for crimping the electric wire with terminal. Is done.

  In the electric wire with terminal in each of the above aspects, the concave portion that is crimped with such a strong force that a gap cannot be formed due to water stop is formed only in a part of the coated crimp portion. In this case, the load on the crimping machine can be reduced as compared with the case where the entire coated crimping part is strongly crimped. In other words, it is possible to increase the water stoppage of the electric wire with terminal without imposing a large load on the crimping machine.

  More specifically, the concave portion passes through the bottom plate portion from one part of the pair of caulking portions so as to include a bent portion at the boundary between the bottom plate portion and each of the pair of caulking portions, particularly in the cover crimping portion where the gap is likely to be generated. It is formed in series over the other part of the pair of caulking portions. Thereby, the water stop of an electric wire with a terminal can be raised, suppressing the load concerning a crimping machine.

  In the 2nd mode, the crevice is formed annularly over the perimeter in the covering pressure bonding part. In this case, the liquid that has entered from the base portion of the crimp terminal and the insulated wire can be more reliably damped at the concave portion in the coated crimp portion, and the water stoppage of the terminal-attached wire can be further increased.

  By the way, in the electric wire with terminal, when an external force is applied to the insulated wire in the bending direction or torsional direction when the concave portion is formed at the rear end portion of the coated crimp portion, Stress tends to concentrate on the portion in contact with the recess. Here, the rear end portion of the coated crimping portion is an edge portion on the opposite side of the core crimping portion side in the coated crimping portion. When stress concentrates on a specific part of the insulated wire, the durability of the insulated wire deteriorates.

  In the 3rd mode, the crevice of a covering crimping part is formed in the middle position between the edge by the side of a core wire crimping part in the covering crimping part, and the edge on the opposite side. The terminal-attached electric wire in which the concave portion is formed at the intermediate position of the coated crimping portion is suitable when an external force is frequently applied to the insulated wire. That is, in the third aspect, since the recessed portion that is strongly crimped is formed at a position away from the rear end portion of the coated crimping portion, stress is applied to a specific part of the insulating coating due to an external force applied to the insulated wire. Concentration is prevented and deterioration of durability of the insulated wire can be prevented.

It is a side view of the principal part of the electric wire 1 with a terminal which concerns on 1st Embodiment. It is a top view of the principal part of the electric wire 1 with a terminal. It is a bottom view of the principal part of the electric wire 1 with a terminal. It is a front sectional view of a crimping machine in which a crimp terminal and an insulated wire are set in a crimping process for manufacturing the electric wire with terminal 1. It is a longitudinal cross-sectional view of the crimping machine in which the crimp terminal and the insulated wire were set in the crimping process. It is a side view of the principal part of 1 A of electric wires with a terminal which concerns on 2nd Embodiment. It is a side view of the principal part of the electric wire 1B with a terminal which concerns on the application example of the electric wire 1 with a terminal.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiment is an example embodying the present invention, and is not an example of limiting the technical scope of the present invention. The electric wire with a terminal concerning each embodiment shown below is a part of wire harness carried in vehicles, such as a car.

<First Embodiment>
First, the structure of the electric wire 1 with a terminal is demonstrated, referring FIGS. 1-3. The terminal-attached electric wire 1 includes an insulated electric wire 9, a crimp terminal 10, and a water stop resin portion 7.

  1 to 3 are a side view, a plan view, and a bottom view of a portion of the crimp terminal 10 of the crimp terminal 10 in the electric wire with terminal 1, respectively.

<Insulated wire>
The insulated wire 9 to which the crimp terminal 10 is attached is a wire having a core wire 910 that is a long conductor and an insulating coating 920 that is an insulator covering the periphery of the core wire 910. In general, the core wire 910 is a stranded wire in which a plurality of strands made of thin conductors are twisted together. However, it is also conceivable that the core wire 910 is a single wire.

  The end portion of the insulated wire 9 to which the crimp terminal 10 is attached is in a state in which the insulation coating 920 has been peeled from the periphery of the core wire 910 of a certain length in advance, that is, the core wire 910 of a certain length is removed from the insulation coating 920. Processed in an extended state.

  Hereinafter, the core wire 910 extending from the end of the insulation coating 920 at the end portion of the insulated wire 9 is referred to as a bare core wire portion 91. In addition, a portion in a certain range (a range having a length of about several millimeters to several tens of millimeters) of the end portion of the insulating coating 920 of the insulated wire 9 is referred to as a covering end portion 92.

  In the terminal-attached electric wire 1, the core wire 910 of the insulated electric wire 9 is, for example, a metal wire whose main component is aluminum. On the other hand, the insulation coating 920 of the insulated wire 9 is a synthetic resin member mainly composed of, for example, polyethylene, vinyl chloride, or polyamide-based nylon. It is also conceivable that the core wire 910 is a metal wire mainly composed of copper.

<Crimp terminal>
As shown in FIGS. 1 to 3, the crimp terminal 10 is formed in a line along the linear direction, the coated crimp part 20, the first connecting part 30, the core crimping part 40, the second connecting part 50, and the like. A contact portion 60 is provided. 4 and 5 show the crimp terminal 10 before being crimped to the insulated wire 9.

  Hereinafter, the linear direction from the coated crimping portion 20 to the core crimping portion 40 and the contact portion 60 in the crimp terminal 10 is referred to as an extending direction. The extending direction is also the longitudinal direction of the insulated wire 9 to which the crimp terminal 10 is attached.

  The crimp terminal 10 is obtained by bending a metal plate material. Moreover, the metal plate material which comprises the crimp terminal 10 is obtained by the punching process with respect to the plate-shaped metal base material in which plating was formed. Accordingly, the metal plate material constituting the crimp terminal 10 is constituted by a base material and plating formed on the surface of the base material.

  For example, the base material of the crimp terminal 10 is a member made of a metal material whose main component is copper, such as copper or a copper alloy. In this case, the entire crimp terminal 10 including plating is made of a metal material mainly composed of copper. On the other hand, the plating is a member made of a metal material mainly composed of tin, such as tin (Sn) or tin alloy in which silver (Ag), copper (Cu), bismuth (Bi) or the like is added to tin.

<Crimp terminal: Coated crimp part>
The coated crimping portion 20 is a plate-like portion formed by bending, and forms a groove into which the coated end portion 92 of the insulated wire 9 is inserted before being crimped to the insulated wire 9. In the terminal-attached electric wire 1, the coated crimping portion 20 is crimped to the coated end portion 92 by being bent along the periphery of the coated end portion 92 inserted inside the groove formed by the coated crimped portion 20. Yes.

  The covering crimping part 20 has a bottom plate part 21 and two covering caulking parts 22. The bottom plate portion 21 is a portion that supports the covered end portion 92 of the insulated wire 9 to which the crimp terminal 10 is attached from one direction (downward). The bottom plate portion 21 is a portion that continues to the bottom plate portion 31 of the first connecting portion 30 that is a portion on the core crimping portion 40 side along the extending direction.

  The two covering caulking portions 22 are portions formed so as to stand up from the bottom plate portion 21 to both sides of the covering end portion 92.

  Hereinafter, the direction in which the two covering caulking portions 22 that are orthogonal to the extending direction and stand up from the bottom plate portion 21 face each other is referred to as a width direction. Furthermore, a direction orthogonal to the stretching direction and the width direction is referred to as a height direction. Accordingly, the bottom plate portion 21 supports the covered end portion 92 of the insulated wire 9 from one side in the height direction.

  The two covering caulking portions 22 that stand up are bent in a direction facing the bottom plate portion 21 and caulked to the covering end portion 92. At this time, in the example shown in FIGS. 1 and 2, one of the two covering caulking portions 22 is overlapped and caulked on the outside of the other covering caulking portion 22. That is, the coated crimping portion 20 shown in the present embodiment is a superposition type that is crimped in a state where a part of the two coated crimping portions 22 are overlapped.

  In addition, it is also conceivable that the coated crimping portion 20 is a butted type that is crimped in a state in which the edge portions of the two coated caulking portions 22 are butted.

  In the present embodiment, as shown in FIGS. 1 to 3, the recess 25 has an entire circumference at an intermediate position between the edge 201 on the core crimping part 40 side and the edge 202 on the opposite side in the coated crimping part 20. An annular shape is formed over the entire area. More specifically, the concave portion 25 is formed in a series from one end portion of the two covering caulking portions 22 through the bottom plate portion 21 to the leading end portion of the other covering caulking portion 22.

  The recessed portion 25 of the coated crimping portion 20 is a portion that is recessed toward the coated end portion 92 by being more strongly crimped to the coated end portion 92 than the other portions of the coated crimped portion 20. Accordingly, the concave portion 25 is a portion that is recessed on the outer surface of the coated crimping portion 20, and a portion that is raised on the inner surface of the coated crimping portion 20 and bites into the coated end portion 92.

  The recess 25 is formed by pressure-bonding between the outer surface of the insulated wire 9 and the inner surface of the recess 25 with a force that does not allow a gap that can serve as a liquid intrusion path. It should be noted that portions other than the concave portion 25 in the coated crimping portion 20 are crimped with a force suitable for fixing the crimping terminal 10 to the insulated wire 9 as is conventional.

  The concave portion 25 of the cover crimping portion 20 is formed using, for example, a crimping machine 8 as shown in FIGS. This will be described later.

<Crimp terminal: Core wire crimping part>
The core wire crimping portion 40 is a plate-like portion bent and formed in a state before being crimped to the insulated wire 9, and forms a groove into which the bare core wire portion 91 of the insulated wire 9 is inserted. In the terminal-attached electric wire 1, the core wire crimping portion 40 is crimped to the bare core wire portion 91 inserted inside the groove formed by the core wire crimping portion 40.

  The core wire crimping portion 40 includes a bottom plate portion 41 and two core wire caulking portions 42. The bottom plate portion 41 is a portion that supports the bare core wire portion 91 in the insulated wire 9 to which the crimp terminal 10 is attached from one side in the height direction. Further, the two core wire caulking portions 42 are portions formed so as to stand up from the bottom plate portion 41 to both sides of the bare core wire portion 91.

  A portion occupying a part of the distal end side of each core caulking portion 42 is bent in a direction facing the bottom plate portion 41 and caulked to the bare core wire portion 91. The core wire crimping portion 40 shown in the present embodiment is a butting type in which the two core wire crimping portions 42 do not overlap. However, it is also conceivable that the core wire crimping portion 40 is an overlap type in which two core wire caulking portions 42 are overlapped and caulked to the bare core wire portion 91, or a closed barrel type formed in a cylindrical shape.

<Crimp terminal: First connection part>
The first connecting portion 30 is a portion that connects the coated crimping portion 20 and the core wire crimping portion 40. The first connecting portion 30 is a plate-like portion formed by bending, and forms a groove into which a boundary portion between the covering end portion 92 and the bare core wire portion 91 is inserted. And the 1st connection part 30 is two bottom plates 31 which connected the bottom plate part 21 of the coating crimping part 20 and the bottom plate part 41 of the core wire crimping part 40, and extended from the bottom plate part 31 to both sides of the insulated wire 9. And a side wall portion 32.

<Crimp terminal: Contact part>
The contact portion 60 is a portion that comes into direct contact with the mating terminal by fitting with a mating terminal (not shown) to which the crimp terminal 10 is connected. The contact portion 60 shown in FIG. 1 has a terminal insertion hole into which a mating terminal is fitted. In addition, the contact part 60 may be a rod-shaped conductor fitted in the terminal insertion hole of the counterpart terminal.

<Crimp terminal: Second connection part>
The second connecting portion 50 is a portion that connects the core wire crimping portion 40 and the contact portion 60. The 2nd connection part 50 is the plate-shaped part formed by bending, and forms the groove | channel. The tip end portion 911 of the bare core wire portion 91 may protrude from the core wire crimping portion 40 into the groove formed by the second connecting portion 50, but it may not be. And the 2nd connection part 50 has the baseplate part 51 connected with the baseplate part 41 of the core wire crimping part 40, and the two side wall parts 52 extended from the baseplate part 51 and stood up.

<Waterproof resin part>
A water stop resin portion 7 for preventing corrosion of the bare core wire portion 91 is formed at an end portion of the insulated wire 9 in the electric wire with terminal 1. The water-stopping resin portion 7 is a synthetic resin coating that covers the bare core wire portion 91 of the insulated wire 9 from the outside of the crimp terminal 10. The water stop resin portion 7 is formed of a member obtained by solidifying a fluid synthetic resin.

  In the terminal-attached electric wire 1, the region to be covered for preventing corrosion of the bare core wire portion 91 is at least a portion of the insulated wire 9 from the edge 201 of the coated crimping portion 20 to the tip portion 911 of the core wire 910.

  For example, the water stop resin portion 7 is formed in a range from an intermediate position of the cover crimping portion 20 crimped to the covering end portion 92 of the insulated wire 9 to an intermediate position in the extending direction of the second connecting portion 50. And the water stop resin part 7 has covered and sealed the part exposed from the crimp terminal 10 in the insulated wire 9 which exists in the range.

  The water stop resin portion 7 is, for example, a silicon-based, acrylic-based, urethane-based, polyamide-based, or epoxy-based synthetic resin. Moreover, in the example shown by FIGS. 1-3, the water stop resin part 7 is comprised with the transparent or translucent material. However, it is also conceivable that the water stop resin portion 7 is made of a resin that is not transparent. If the water-stopping resin part 7 is made of a colored translucent material, the thickness of the water-stopping resin part 7 can be easily confirmed.

  The water stop resin portion 7 is formed by supplying a fluid synthetic resin to the end of the insulated wire 9 from above. The synthetic resin flowing down to the end of the insulated wire 9 is solidified through a predetermined solidification process.

  For example, when the water-stopping resin portion 7 is made of a thermoplastic resin, the solidification process is a cooling process. Moreover, when the water stop resin part 7 consists of moisture solidification resin, a solidification process is a process of exposing moisture solidification resin to the air containing moisture for a predetermined time. Moreover, when the water stop resin part 7 consists of ultraviolet curable resin, a solidification process is a process of irradiating an ultraviolet light.

<Crimping process for manufacturing electric wires with terminals>
Next, the crimping | compression-bonding process for manufacturing the electric wire 1 with a terminal is demonstrated, referring FIG. FIG. 4 is a front sectional view of the crimping machine 8 in which the crimp terminal 10 and the insulated wire 9 are set in the crimping process. FIG. 5 is a cross-sectional view of the crimping machine 8 in which the crimp terminal 10 and the insulated wire 9 are set in the II-II plane shown in FIG. A crimping | compression-bonding process is a one part process in the manufacturing process of the electric wire 1 with a terminal, and is also a process of forming the recessed part 25 of the covering crimping | compression-bonding part 20. FIG.

  The crimping machine 8 shown in FIGS. 4 and 5 includes a lower mold 82 that supports the insulated wire 9 and the crimp terminal 10, and an upper mold 81 that bends and crimps the two covering crimping portions 22 of the crimp terminal 10. . The upper mold 81 and the lower mold 82 are supported by a support mechanism (not shown) so that one or both of them can approach and be separated from each other.

  The upper die 81 has a molding surface 811 for molding the two covering caulking portions 22 of the covering crimping portion 20. A protruding portion 812 that forms the concave portion 25 of the coated crimping portion 20 is formed on a part of the molding surface 811. In the present embodiment, the two covering caulking portions 22 are of an overlapping type. Therefore, on the molding surface 811 of the upper mold 81, the shape of the molding surface 811A that molds one of the two coating caulking portions 22 in the coating crimping portion 20, and the shape of the molding surface 811B that molds the other coating caulking portion 22 Is different. That is, the molding surfaces 811A and 811B for caulking the two covering caulking portions 22 of the covering crimping portion 20 in the upper mold 81 are formed to be asymmetric in the width direction.

  On the other hand, the lower mold 82 has a support surface 821 that supports the bottom plate portion 21 of the cover crimping portion 20 in the crimp terminal 10 and the bent portion 23 at the boundary between the bottom plate portion 21 and each of the two cover crimping portions 22. . A protrusion 822 for forming the recess 25 in the coated crimping portion 20 is formed on a part of the support surface 821. Note that the support surface 821 is a molding surface of the lower mold 82.

  In the present embodiment, the protrusion 812 in the upper mold 81 is formed at an intermediate position between the edge 201 and the edge 202 of the cover crimping part 20 in the extending direction, and is continuously formed in the width direction of the upper mold 81. Is formed.

  Similarly, the protrusions 822 in the lower mold 82 are also formed at intermediate positions between the edge 201 and the edge 202 of the covering crimping part 20 in the extending direction, and formed in series in the width direction of the lower mold 82. Yes.

  One or both of the upper mold 81 and the lower mold 82 move in the direction in which they approach each other, so that the cover crimping portion 20 in the crimp terminal 10 is crushed between the upper mold 81 and the lower mold 82. And crimped to the covering end 92. At that time, the two covering caulking portions 22 of the covering crimping portion 20 are bent in a direction facing the bottom plate portion 21 along the molding surface 811 of the upper mold 81 and are caulked to the covering end portion 92. Further, the bottom plate portion 21 and the bent portion 23 of the covering crimping portion 20 are bent along the support surface 821 of the lower mold 82 and are caulked to the covering end portion 92.

  At this time, in the coated crimping portion 20, the strong crimping target portion 24 sandwiched between the protruding portion 812 of the upper mold 81 and the protruding portion 822 of the lower mold 82 is crimped with a stronger force than the other portions. The strong pressure bonding target portion 24 eventually becomes in a state of being recessed toward the insulated wire 9 than the portion other than the strong pressure bonding target portion 24 in the coated pressure bonding portion 20, and the concave portion 25 is formed.

<Effect>
The recessed portion 25 of the coated crimping portion 20 is more strongly crimped than the other portions of the coated crimped portion 20 other than the recessed portion 25 and has a shape recessed toward the insulated wire 9 side. Thereby, the inner surface of the recess 25 can be brought into close contact with the outer peripheral surface of the insulating coating 920 in the insulated wire 9.

  The liquid that has entered from between the coated crimping portion 20 and the insulated wire 9 is blocked at the concave portion 25. Therefore, it is possible to prevent liquid from entering the joint portion between the bare core wire portion 91 and the core wire crimping portion 40. In this case, the water stoppage of the terminal-attached electric wire 1 can be increased without affecting the electrical characteristics of the terminal-attached electric wire 1.

  Further, the concave portion 25 of the cover crimping portion 20 can be formed by using a crimping machine 8 including an upper die 81 and a lower die 82 having convex portions in part. The modification of providing a convex part on a part of the mold is very simple. Therefore, a large-scale molding apparatus and a large amount of resin are unnecessary, and an increase in manufacturing cost of the terminal-attached electric wire 1 can be suppressed.

  Since it showed above, it becomes possible to suppress the increase in manufacturing cost, without affecting the electrical property of the electric wire 1 with a terminal, and to raise the water stop of the electric wire 1 with a terminal.

  In addition, when the entire coated crimped portion 20 is crimped to the insulated wire 9 with such a strong force that no gap is generated between the coated crimped portion 20 and the insulated wire 9, a crimping machine used for crimping (projected to a part of the mold) It is expected that a large load will be applied to the crimping machine in which no part is provided.

  Therefore, in the electric wire with terminal 1 manufactured using the crimping machine 8, the concave portion 25 that is crimped with such a strong force that a gap cannot be formed due to water stop is formed only in a part of the coated crimping portion 20. In this case, the load on the crimping machine 8 can be reduced as compared with the case where the entire coated crimping portion 20 is strongly crimped. That is, it is possible to increase the water stoppage of the terminal-attached electric wire 1 without imposing a large load on the crimping machine 8.

  More specifically, the recess 25 includes one of the two covering caulking portions so as to include a bent portion 23 at the boundary between the bottom plate portion 21 and each of the two covering caulking portions 22 in the covering crimping portion 20 in which a gap is particularly likely to occur. It is formed in series from the front end portion to the other front end portion of the two covering caulking portions 22 through the bottom plate portion 21. That is, the concave portion 25 is formed in an annular shape over the entire circumference in the coated crimping portion 20. In this case, the liquid that has entered from the base portion of the crimp terminal 10 and the insulated wire 9 can be reliably dammed at the concave portion 25 in the coated crimp portion 20, and the water stoppage of the terminal-attached wire 1 can be increased. it can.

  Further, the recessed portion 25 of the coated crimping portion 20 is formed at an intermediate position between the edge 201 on the core crimping portion 40 side of the coated crimped portion 20 and the edge 202 on the opposite side. Such a terminal-attached electric wire 1 is suitable when an external force is frequently applied to the insulated electric wire 9. That is, since the recessed portion 25 that is strongly crimped is formed at a position away from the edge portion 202 of the coated crimping portion 20, stress concentrates on a specific portion of the insulating coating 920 due to an external force applied to the insulated wire 9. This can prevent the deterioration of the durability of the insulated wire 9.

Second Embodiment
Next, a terminal-equipped electric wire 1A according to a second embodiment of the present invention will be described with reference to FIG. The electric wire with terminal 1 </ b> A differs from the electric wire with terminal 1 only in the formation range of the recesses in the covered crimp portion 20 of the crimp terminal 10.

  FIG. 6 is a side view of the main part of the electric wire with terminal 1A. In FIG. 6, the same reference numerals are given to the same components as those shown in FIGS. Hereinafter, only the differences between the terminal-attached electric wire 1A and the terminal-attached electric wire 1 will be described.

  In the terminal-attached electric wire 1 </ b> A, a concave portion 25 </ b> A is formed in the coated crimp portion 20. The concave portion 25 </ b> A is formed at a middle position between the edge portion 201 and the edge portion 202 of the covering crimping portion 20, from one part of the two covering caulking parts 22 through the bottom plate part 21, and the other part of the two covering caulking parts 22. It is formed in series. Accordingly, the concave portion 25A is formed in series across the bottom plate portion 21 and the bent portion 23 at the boundary between the two covering caulking portions 22 in the covering crimping portion 20.

  The terminal-attached electric wire 1A is, for example, a crimping machine that includes an upper mold in which the upper mold 81 shown in FIGS. 4 and 5 is not provided with the projection 812, and a lower mold 82 having a support surface 821 and a projection 822. It is manufactured using.

  In the terminal-attached electric wire 1A according to the present embodiment, the recesses 25A are formed in series across the bottom plate portion 21 and the bent portion 23 in which a gap is particularly likely to occur in the coated crimping portion 20. Thereby, the water stop of the electric wire 1A with a terminal can be improved, suppressing the load concerning a crimping machine.

<Application example>
In the electric wire with terminal 1, 1 </ b> A, there may be a case where the recesses 25 and 25 </ b> A of the coated crimping portion 20 in the crimp terminal 10 are not formed at an intermediate position between the edge 201 and the edge 202 of the coated crimped portion 20. .

  For example, the recessed portion 25 of the coated crimping portion 20 in the crimp terminal 10 is connected to the edge 201 or the edge 202 of the coated crimping portion 20 like the terminal-attached electric wire 1B. The case where it forms is also considered.

  Further, in the terminal-attached electric wire 1B shown in FIG. 7, a case in which a recess 25A is formed instead of the recess 25 can be considered.

  In any of the above cases, the liquid is blocked at the positions of the recesses 25 and 25A. Therefore, the liquid can be prevented from entering the joined portion between the bare core wire portion 91 and the core wire crimping portion 40, and the water stoppage of the electric wire with terminal can be increased.

  The terminal-attached electric wire according to the present invention can be obtained by freely combining the embodiments described above within the scope of the invention described in each claim, or by appropriately modifying or partially changing each embodiment. It is also possible to configure by omitting.

1, 1A, 1B Electric wire with terminal 7 Water-stopping resin part 8 Crimping machine 9 Insulated wire 10 Crimping terminal 20 Covering crimping part 21 Bottom plate part 22 Covering caulking part 23 Bending part 24 Strong crimping target part 25, 25A Concave part 30 First connecting part 31 Bottom plate portion 32 Side wall portion 40 Core wire crimping portion 41 Bottom plate portion 42 Core wire crimping portion 50 Second connecting portion 51 Bottom plate portion 52 Side wall portion 60 Contact portion 81 Upper die 82 Lower die 91 Bare core wire portion 92 Covering end portion 201 Edge portion 202 Edges 811, 811A, 811B Molding surface 812 Protruding portion 821 Supporting surface 822 Protruding portion 910 Core wire 911 Tip portion 920 Insulation coating

Claims (3)

Insulated wires,
A crimp terminal having a coating crimping part and a core crimping part crimped to each of the insulation coating part of the insulated wire and the core wire extending from the insulation coating;
A water-stopping resin portion that is a synthetic resin member that covers at least the portion exposed from the crimping terminal on the distal end side from the portion of the insulated wire that contacts the edge of the coated crimping portion on the core crimping portion side. ,
The coated crimping part is
A bottom plate portion connected to a portion on the core crimping portion side along the longitudinal direction of the insulated wire;
A pair of caulking portions formed to be bent to a position facing the bottom plate portion with the insulated wires sandwiched between the bottom plate portion and standing on both sides of the insulated wire from the bottom plate portion;
The covering crimping part is formed in a series from at least one part of the pair of caulking parts to the other part of the pair of caulking parts through the bottom plate part, The electric wire with a terminal in which the recessed part dented to the said insulation coating side is formed by crimping | bonding to the said insulation coating strongly rather than the part. It is an electric wire with a terminal according to claim 1,
The electric wire with a terminal, wherein the concave portion is formed in an annular shape over the entire circumference of the coated crimping portion. It is an electric wire with a terminal according to claim 1 or claim 2,
The electric wire with a terminal, wherein the concave portion is formed at an intermediate position between the edge portion on the core crimping portion side and the opposite edge portion of the coated crimping portion.

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