JP2015103435A - Wire with terminal, insulated wire, and manufacturing method of insulated wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique which, even in the case where an insulated wire is changed to a thicker one, is capable of attaching a terminal connected to an end of the insulated wire to a cavity of a connector satisfactorily without changing the connector.SOLUTION: A wire 3 with a terminal comprises an insulated wire 1 and a terminal 2. The insulated wire 1 comprises a core wire 11 and an insulation coating 12 which coats an outer periphery of the core wire 11 while exposing an end portion of the core wire 11. The terminal 2 is connected to an end of the insulated wire 1 where the core wire 11 is exposed. Herein, the thickness of an end portion (second coated portion 12b) where the exposed core wire 11 extends out in the insulation coating 12 is thinner than the thickness of the other portion (first coated portion 12a) in the insulation coating 12.

Description

  The present invention relates to an insulated wire, a terminal-attached wire in which a terminal is connected to the end of the insulated wire, and a method of manufacturing the insulated wire.

  In a wire harness mounted on a vehicle such as an automobile, for example, a terminal is connected to an end of an insulated wire to form an electric wire with a terminal. And the terminal connected to the terminal of the terminal-attached electric wire is inserted into the terminal accommodating chamber (so-called cavity) of the connector, and the connector accommodating the terminal is the electrical equipment or the connector accommodating the other terminal. And so on. As a result, the terminal in the connector is fitted with the counterpart terminal to be connected, and is electrically connected to the counterpart terminal.

  By the way, in recent years, as an alternative to an insulated wire (so-called copper wire) in which a core wire mainly composed of copper is covered with an insulation coating, an insulated wire (so-called copper wire) in which a core wire mainly composed of aluminum is covered with an insulation coating. Aluminum wires) have been proposed. Aluminum wires are lighter and cheaper than copper wires with equivalent conductive performance, so the place where copper wires were used was replaced with aluminum wires to reduce vehicle weight and reduce costs. Therefore, it is desired to expand the range of use of aluminum wires.

  However, aluminum has a lower electrical conductivity than copper. For this reason, when it replaces the place where the copper electric wire was used with the aluminum electric wire which has equivalent electroconductivity, there exists a difficulty that an electric wire will become thick. When the wire becomes thick, when you try to insert the terminal attached to the terminal into the connector cavity, the outer periphery of the wire will be caught at the entrance of the cavity, and the terminal will be inserted to the proper position in the cavity The problem of not being able to do arises.

  In order to avoid such a problem, for example, it is also a proposal to change the design of the connector (see Patent Document 1).

JP 2013-168335 A

  However, when an electric wire having a light and inexpensive conductor, such as an aluminum electric wire, is employed, and a connector is remade for this purpose, the cost reduction effect due to the adoption of the aluminum electric wire is reduced. In addition, in a wire harness or the like arranged in a limited vehicle space, it is desirable that the connector be as small as possible regardless of the type of electric wire, and it is preferable to change the connector to a larger size in accordance with the increase in the diameter of the electric wire. Absent. Furthermore, in wire harnesses mounted on vehicles, the specifications of connectors are often specified from the vehicle equipment side, and in such cases, the change of connectors is not allowed, so the specified connectors cannot be used. Electric wires cannot be used in the first place.

  The present invention has been made in view of the above problems, and even when the electric wire is changed to a thicker one, the terminal connected to the end of the electric wire can be connected to the connector cavity without changing the connector. It aims at providing the technique which can be mounted | worn satisfactorily.

  A 1st aspect is an electric wire with a terminal, Comprising: The insulated wire provided with the core wire and the insulation coating which coat | covers the outer periphery of the said core wire, exposing the edge part part of the said core wire, The said core wire in the said insulated wire A terminal connected to the terminal on the exposed side, and the thickness of the end portion on the side where the exposed core wire extends in the insulating coating is larger than the thickness of the other portion in the insulating coating, thin.

A 2nd aspect is an electric wire with a terminal concerning the 1st aspect, and the above-mentioned terminal is a core wire barrel part crimped to the end part of the above-mentioned core wire, and the covering crimped to the end part of the above-mentioned insulating coating The barrel part,
Is provided.

  A third aspect is a terminal-attached electric wire according to the first or second aspect, wherein the end portion of the insulating coating is disposed in the cavity in a state where the terminal is normally inserted into the cavity of the connector. This is the portion of the insulation coating that will be.

  A fourth aspect is a terminal-attached electric wire according to any one of the first to third aspects, wherein the insulating coating includes an outer periphery of a portion of the core wire excluding the end portion and its adjacent portion. A first coating to be coated; and a second coating that is thinner than the first coating and covers an outer periphery of the adjacent portion.

  A 5th aspect is an electric wire with a terminal concerning the 4th aspect, Comprising: The edge part of the said 2nd coating | cover and the edge part of the said 1st coating | cover overlap.

  A 6th aspect is an insulated wire, Comprising: A core wire and the insulation coating which coat | covers the outer periphery of the said core wire, exposing the edge part of the said core wire, The exposed core wire in the said insulation coating extends The thickness of the end portion on the side is thinner than the thickness of other portions in the insulating coating.

  A seventh aspect is a method for manufacturing an insulated wire, in which a) a step of forming a first coating covering an outer periphery of a portion of the core wire excluding an end portion and an adjacent portion thereof; b) the first Forming a second coating that is thinner than one coating and covers the outer periphery of the adjacent portion.

  An eighth aspect is a method for manufacturing an insulated wire according to the seventh aspect, wherein the step b) includes a step of b1) disposing a shrinkable tube that shrinks by heating around the adjacent portion; and b2 ) Forming the second coating by heating and shrinking the shrinkable tube.

  A ninth aspect is a method of manufacturing an insulated wire according to the eighth aspect, wherein in the step b1), the end of the contraction tube is disposed so as to cover the end of the first covering, In step b2), the contraction tube is contracted in a state where the end of the contraction tube overlaps the end of the first coating.

  According to the first aspect, the thickness of the end portion of the insulating coating on the side where the exposed core wire extends is thinner than the thickness of the other portion. According to this configuration, when the terminal connected to the end of the insulated wire is inserted into the cavity of the connector, the outer peripheral edge of the insulating coating is not easily caught by the entrance of the cavity. Therefore, if the electric wire with terminal according to this aspect is adopted, even when the electric wire is changed to a thicker one, the terminal connected to the end of the electric wire can be satisfactorily provided in the connector cavity without changing the connector. Can be installed.

  According to the 2nd aspect, a coating | coated barrel part is crimped | bonded to the relatively thin part in insulation coating. According to this structure, the outer diameter of the part to which the coating | coated barrel part is crimped | bonded in an electric wire with a terminal can be restrained small. Therefore, when the terminal is inserted into the cavity of the connector, the outer peripheral edge of the covering barrel portion of the terminal is not easily caught by the entrance of the cavity.

  According to the 3rd aspect, the part of the insulation coating which will be arrange | positioned in a cavity in the state normally inserted in the cavity of the connector is made thinner than the other part of an insulation coating. According to this configuration, the terminal can be smoothly inserted into the cavity of the connector.

  According to the fourth aspect, the insulating coating includes the relatively thick first coating and the relatively thin second coating. According to this configuration, since the thickness of each coating can be defined independently, the thickness of the end portion of the insulating coating can be made sufficiently thin regardless of the thickness of other portions.

  In particular, according to the fifth aspect, the end portion of the relatively thin second coating overlaps the end portion of the relatively thick first coating. According to this configuration, the second coating is sufficiently fixed to the first coating.

  According to the sixth aspect, the thickness of the end portion of the insulating coating on the side where the exposed core wire extends is thinner than the thickness of the other portion. According to this configuration, when the terminal connected to the end of the insulated wire is inserted into the cavity of the connector, the outer peripheral edge of the insulating coating is not easily caught by the entrance of the cavity. Therefore, if the insulated electric wire according to this aspect is adopted, even when the electric wire is changed to a thicker one, the terminal connected to the end of the electric wire can be satisfactorily attached to the connector cavity without changing the connector. it can.

  According to the seventh aspect, the insulating coating includes a relatively thick first coating and a relatively thin second coating. According to this configuration, since the thickness of each coating can be defined independently, the thickness of the end portion of the insulating coating can be made sufficiently thin regardless of the thickness of other portions.

  According to the eighth aspect, the relatively thin second coating is formed using a contraction tube that contracts by heating. According to this structure, the insulating coating in which the thickness of the end portion is thinner than the thickness of the other portions can be easily manufactured.

  According to the ninth aspect, it is possible to obtain an insulated wire in which the end portion of the relatively thin second coating overlaps the end portion of the relatively thick first coating. In this insulated wire, the second coating is sufficiently fixed to the first coating.

It is a schematic perspective view which shows an electric wire with a terminal and a connector. It is a schematic sectional drawing which shows the state in which the terminal is normally inserted in the cavity. It is a schematic side view near the edge part of an insulated wire. It is a figure for demonstrating the manufacturing process of an insulated wire. It is a schematic side view near the edge part of an electric wire with a terminal. It is a schematic side view near the edge part of the insulated wire which concerns on a modification.

  Hereinafter, embodiments will be described with reference to the 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. In the drawings, the size and number of each part may be exaggerated or simplified for easy understanding.

<1. Connector 9>
Before explaining the insulated wire 1 and the terminal-attached electric wire 3 to which the terminal 2 is connected, the connector 9 into which the terminal 2 connected to the terminal of the terminal-attached electric wire 3 is inserted will be described with reference to FIGS. This will be described with reference to FIG. FIG. 1 is a schematic perspective view showing the terminal-attached electric wire 3 and the connector 9. FIG. 2 is a schematic side view showing a state in which the terminal 2 is normally inserted into the cavity 90.

  The connector 9 is a member that holds the terminal 2 connected to each terminal of the plurality of terminal-attached electric wires 3 at a predetermined position. The connector 9 is formed of, for example, a non-conductive material (specifically, for example, a non-conductive resin material), and the outer frame portion 91 and the inside of the outer frame portion 91 are provided with a plurality of terminal accommodating chambers (so-called cavities). ) Partition wall sectioned into 90 (specifically, for example, a first partition wall section 92 partitioning a space in the outer frame section 91 in the height direction and a space in the outer frame section 91 in the width direction). Second partition wall portion 93).

  Each cavity 90 accommodates the terminal 2 attached to the end of the terminal-attached electric wire 3. In a state in which the terminal 2 is normally inserted into the cavity 90 (hereinafter also simply referred to as “regular insertion state”), the terminal 2 has its tip (end on the terminal connection portion 21 side) reaching a predetermined position H. To be arranged. In the cavity 90, for example, a locking portion (so-called lance) (not shown) extending from the inner wall is formed, and the terminal 2 can be engaged with the lance. A stop-shaped portion (not shown) is formed. In the normal insertion state, the locked shape portion of the terminal 2 is caught by the lance, so that the terminal 2 is prevented from coming off from the connector 9.

  In the regular insertion state, the terminal 2 is entirely disposed in the cavity 90. This prevents a part of the terminal 2 inserted into a certain cavity 90 from coming into contact with the terminal 2 inserted into the adjacent cavity 90 to be short-circuited. In the following, the portion of the insulated wire 1 to be disposed in the cavity 90 in the normal insertion state is also referred to as “inserted wire portion 101”, and the length of the portion is also referred to as “inserted wire length L”. Further, the portion of the insulated wire 1 to be disposed outside the cavity 90 is also referred to as a “non-inserted wire portion 102”.

  The connector 9 in which the terminal 2 is normally inserted into the cavity 90 is fitted to an electrical device or a connector in which the counterpart terminal is accommodated, so that the terminal 2 in the connector 9 is a counterpart to be connected. It fits into the side terminal and is in a state of being electrically connected to the counterpart terminal.

<2. Insulated wire 1>
<2-1. Configuration of insulated wire 1>
The configuration of the insulated wire 1 will be described with reference to FIG. FIG. 3 is a schematic side view showing the insulated wire 1.

  The insulated wire 1 includes a core wire 11 and an insulating coating 12 that covers an outer periphery of the core wire 11 while exposing an end portion of the core wire 11.

  The core wire 11 is formed by, for example, a plurality of strands. Specifically, the strand is formed of a metal wire such as aluminum, an aluminum alloy, copper, or a copper alloy. For example, the core wire 11 may be a so-called twisted wire in which a plurality of strands formed of metal wires are twisted together.

  The insulating coating 12 is formed of an insulating material and covers the outer periphery of the core wire 11 while exposing the end portion of the core wire 11. The insulating coating 12 serves to insulate the core wire 11 from surrounding members and protect the core wire 11.

  Hereinafter, the end portion of the core wire 11 (that is, the exposed portion of the core wire 11 extending from the end of the insulating coating 12) is also referred to as an “exposed core wire portion 111”. Further, the end portion of the insulating coating 12 on the side where the exposed core portion 111 extends (more specifically, the inserted electric wire portion (that is, the insulated electric wire 1 to be disposed in the cavity 90 in the normal insertion state). The portion of the insulating coating 12 formed on the portion 101 is referred to as a “second coating portion 12b”. Further, in the insulating coating 12, other portions than the second coated portion 12b (more specifically, the non-inserted electric wire portion (that is, the portion of the insulated electric wire 1 to be disposed outside the cavity 90 in the normal insertion state) ) The portion of the insulating coating 12 formed on 102) is referred to as a “first coating portion 12a”.

  In the insulating coating 12, the thickness Db of the second coating portion 12b is thinner than the thickness Da of the first coating portion 12a. That is, in the insulation coating 12, the thickness Db of the end portion 12b on the side where the exposed core wire portion 111 extends is thinner than the thickness Da of the other portion 12a.

  Now, the maximum outer diameter of the cylindrical member that can be inserted into the cavity 90 of the connector 9 is referred to as the “allowable maximum dimension L” of the cavity 90 (see FIG. 2). The thickness Db of the second covering portion 12b is the thickness of the covering barrel portion 23 (described later) of the terminal 2 that is crimp-connected to the outer diameter Tb of the portion covered with the second covering portion 12b of the insulated wire 1. The dimension Kb to which is added is defined such that it is equal to or smaller than the allowable maximum dimension L of the cavity 90. Therefore, as shown in FIG. 2, it is possible to satisfactorily insert the portion covered with the second covering portion 12 b of the insulated wire 1 and the covering barrel portion 23 that is crimp-connected thereto into the cavity 90. it can.

  On the other hand, the 1st coating | coated part 12a is a coating | coated part formed in the non-insertion electric wire part 102 as above-mentioned. Therefore, there is no problem even if the outer diameter Ta of the portion covered with the first covering portion 12 a in the insulated wire 1 is larger than the allowable maximum dimension L of the cavity 90. That is, the thickness Da of the first covering portion 12a can be defined without considering the dimension of the cavity 90. The specific dimension of the thickness Da of the first covering portion 12a is defined from, for example, the environment in which the insulated wire 1 is disposed. For example, since the insulated wire 1 disposed in a relatively high temperature environment such as an engine room is required to have a heat resistant temperature of about 100 ° C., for example, the thickness Da of the first covering portion 12a The thickness is made thick (for example, about 0.3 mm). Further, for example, the insulated wire 1 disposed in a room temperature environment such as a passenger compartment is sufficient at a heat-resistant temperature of about 80 ° C., for example, so that the thickness Da of the first covering portion 12a is a relatively thin dimension. (For example, about 0.2 mm).

  In addition, since the thickness Db of the 2nd coating | coated part 12b is thinner than the thickness Da of the 1st coating | coated part 12a, the part covered with the 2nd coating | coated part 12b in the insulated wire 1 is covered with the 1st coating | coated part 12a. It becomes weaker than trauma, etc. However, as described above, the second covering portion 12b is a covering portion formed on the insertion wire portion 101, and the external member directly collides with the portion of the insulated wire 1 covered with the second covering portion 12b. Things are hard to happen. For this reason, even if the thickness Db of the insulation coating 12 in the said part is thinner than another part, the core wire 11 is fully protected.

<2-2. Manufacturing method of insulated wire 1>
Next, a method for manufacturing the insulated wire 1 will be described with reference to FIG. FIG. 4 is a diagram for explaining a manufacturing process of the insulated wire 1.

  First, an insulating coating with a uniform film thickness that covers the outer periphery of the core wire 11 is formed by extrusion coating of a resin material around the core wire 11 (step S1). The thickness of the insulating coating formed here corresponds to the thickness Da of the first covering portion 12a described above.

  Subsequently, the end portion of the insulation coating formed in step S1 is peeled off to expose the end portion 11a of the core wire 11 and the portion (adjacent portion) 11b adjacent thereto (step S2). However, the length of the core wire 11 exposed here (that is, the length obtained by adding the end portion 11a and the adjacent portion 11b) is substantially the same as the inserted wire length L or is longer than the inserted wire length L. Slightly longer. That is, the end portion 11a and the adjacent portion 11b correspond to the inserted electric wire portion 101, and in step S2, the insulating coating of the portion corresponding to the inserted electric wire portion 101 is peeled off. Thereby, the relatively thick first coating 120a that covers the outer periphery of the portion of the core wire 11 excluding the end portion 11a and the adjacent portion 11b (that is, the portion corresponding to the non-insertion electric wire portion 102) is provided. ,It is formed. This first coating 120 a forms the first coating portion 12 a of the insulating coating 12.

  The end portion 11a and the adjacent portion 11b are portions corresponding to the insertion electric wire portion 101. As will be apparent later, the end portion 11a is a portion that finally becomes the exposed core portion 111. The adjacent portion 11b is a portion where the relatively thin second coating 120b is formed in the subsequent steps.

  Subsequently, a shrinkable tube (so-called heat-shrinkable tube) 5 that covers an object by shrinking by heating to reduce the diameter is prepared. However, the contraction tube 5 used here is selected such that the film thickness when the contraction tube 5 contracts corresponds to the thickness Db of the second covering portion 12b described above. Moreover, it is also preferable that what is formed from the material which can implement | achieve the heat resistance required for the insulated wire 1 is selected as the shrinkable tube 5 used here.

  And the core wire 11 in which the 1st coating | cover 120a was formed in the outer periphery is penetrated in the shrinkable tube 5, and the 1st part 11b (namely, 1st of the core wires 11 exposed by step S2) of the core wires 11 is inserted. The contraction tube 5 is arranged around the base portion extending from the end of the covering 120a (step S3). However, at this time, the end portion 11 a of the core wire 11 is disposed outside the contraction tube 5. At this time, the end portion of the shrinkable tube 5 is disposed so as to cover the end of the first covering 120a.

  Subsequently, the contraction tube 5 is heated and contracted (step S4). As a result, a relatively thin second coating 120b that covers the outer periphery of the adjacent portion 11b (that is, the portion corresponding to the insertion wire portion 101 excluding the end portion 11a) is formed. The second coating 120b forms the second coating portion 12b of the insulating coating 12. Further, the end portion 11 a that has been disposed outside the shrinkable tube 5 in step S <b> 3 becomes a shape that extends from the end of the second coating 120 b, and this portion becomes the exposed core portion 111.

  As described above, in step S3, the end portion of the contraction tube 5 is disposed so as to cover the end of the first covering 120a. Therefore, in step S4, the end of the shrinkable tube 5 contracts with the end of the first coating 120a overlapping from above, and the end of the second coating 120b overlaps with the end of the first coating 120a from above. It becomes a state. As a result, the second coating 120b is sufficiently fixed to the first coating 120a.

  The insulated wire 1 is obtained by performing the process of step S1-step S4. In this insulated wire 1, the insulating coating 12 that covers the outer periphery of the core wire 11 while exposing the end portion of the core wire 11 includes a first coating 120a and a separate second coating 120b. As described above, the relatively thick first coating 120a forms the first coating portion 12a of the insulating coating 12, and the relatively thin second coating 120b (however, the end of the second coating 120b) Except for the portion overlapping the first coating 120a) forms the second coating portion 12b of the insulating coating 12.

<3. Electric wire with terminal 3>
The terminal-attached electric wire 3 is formed by attaching the terminal 2 to the end of the insulated wire 1 described above. The terminal-attached electric wire 3 will be described with reference to FIG. FIG. 5 is a schematic side view showing the terminal-attached electric wire 3.

  The terminal 2 connected to the insulated wire 1 is, for example, a copper alloy member such as copper or brass, or tin (Sn) plating on these members or silver (Ag), copper (Cu), bismuth (Bi on tin). ) Or the like is a conductor member plated with a tin alloy. For example, the terminal 2 is crimped to the exposed core part 111 and the terminal connection part 21 that is a part that is directly connected to the counterpart terminal by fitting with the counterpart terminal to be connected and connected to the counterpart terminal. Core wire barrel portion 22, coating barrel portion 23 to be pressure-bonded to insulating coating 12 (specifically, second coating portion 12 b of insulating coating 12), and two connecting portions (terminal connection portion 21 and core wire barrel portion 22. And a second connecting part 25) for connecting the core wire barrel part 22 and the covering barrel part 23).

  The terminal 2 is connected to the terminal of the insulated wire 1 described above using, for example, a mold (for example, crimping connection), whereby the terminal-attached electric wire 3 is formed. Specifically, in a state before being crimped and connected to the insulated wire 1, for example, the core wire barrel portion 22 formed in a substantially U-shaped cross section is compressed and deformed so as to hold the exposed core wire portion 111. Thus, the core wire barrel portion 22 is crimped and connected to the exposed core wire portion 111 (see FIG. 1). Further, in the state before being crimped and connected to the insulated wire 1, for example, the covering barrel portion 23 formed in a substantially U-shaped cross section is compressed and deformed so as to hold the second covering portion 12b. The covering barrel portion 23 is crimped and connected to the second covering portion 12b (see FIG. 1). The core wire barrel portion 22 is crimped and connected to the exposed core wire portion 111, whereby the terminal 2 and the core wire 11 are electrically connected and the terminal 2 is fixed to the core wire 11. In addition, the terminal 2 is fixed to the insulating coating 12 by crimping the coating barrel portion 23 to the second coating portion 12b.

  In the illustrated example, the terminal connection portion 21 is formed in a substantially cylindrical shape (so-called female terminal shape), and a mating terminal (so-called male terminal) having a pin-like or tab-like connection portion. Terminal) can be inserted and connected, but the terminal connection portion 21 may be formed in a pin shape or tab shape (so-called male terminal shape). You may form in the annular shape etc. which can be connected to a member.

<4. Effect>
According to the above embodiment, the thickness of the end portion (second covering portion) 12b on the side where the exposed core portion 111 extends in the insulating coating 12 is larger than the thickness of the other portion (first covering portion) 12a. thin. According to this configuration, when the terminal 2 connected to the terminal of the insulated wire 1 is inserted into the cavity 90 of the connector 9, the outer peripheral edge of the insulating coating 12 is not easily caught by the entrance of the cavity 90. Therefore, if the insulated wire 1 according to the above-described embodiment (and eventually the wire with terminal 3 with the terminal 2 connected to its terminal) is adopted, the connector 9 is changed even when the wire is changed to a thicker one. The terminal connected to the end of the electric wire can be satisfactorily attached to the cavity 90 of the connector 9 without doing so.

  Moreover, according to said embodiment, the coating | coated barrel part 23 is crimped | bonded to the 2nd coating | coated part 12b (namely, relatively thin coating | coated part) of the insulating coating 12. FIG. According to this structure, the outer diameter of the part to which the coating | coated barrel part 23 is crimped | bonded in the electric wire 3 with a terminal can be restrained small. Therefore, when the terminal 2 is inserted into the cavity 90 of the connector 9, the outer peripheral edge of the covering barrel portion 23 of the terminal 2 is not easily caught by the entrance of the cavity 90.

  Further, according to the above-described embodiment, the portion 12b of the insulating coating 12 to be disposed in the cavity 90 in a state where the terminal 2 is normally inserted into the cavity 90 of the connector 9 is more than the other portion 12a. It is said to be thin. According to this configuration, the terminal 2 can be smoothly inserted into the cavity 90 of the connector 9.

  Moreover, according to said embodiment, the insulation coating 12 is comprised including the relatively thick 1st coating 120a and the relatively thin 2nd coating 120b. According to this configuration, since the thickness of each of the coatings 120a and 120b can be defined independently, the thickness Db of the end portion 12b of the insulating coating 12 can be made sufficiently thin regardless of the thickness Da of the other portion 12a. .

  Further, according to the above embodiment, the end portion of the relatively thin second coating 120b and the end portion of the relatively thick first coating 120a overlap each other. According to this configuration, the second coating 120b is sufficiently fixed to the first coating 120a.

  Moreover, according to said embodiment, the relatively thin 2nd coating | cover 120b is formed using the shrinkable tube 5 which shrinks by heating. According to this configuration, the insulating coating 12 in which the thickness Db of the end portion 12b is thinner than the thickness Da of the other portion 12a can be easily manufactured.

<5. Modification>
In the above embodiment, the end portion of the second coating 120b overlaps the end portion of the first coating 120a, but the end portion of the second coating 120b is the end portion of the first coating 120a. And the end of the second covering 120b and the end of the first covering 120a are in contact with each other without leaving a gap (or like the insulated wire 1a shown in FIG. 6 (or It may be in a state of being close to each other with a minute gap.

  In the above embodiment, the end portion of the second covering 120b overlaps the end portion of the first covering 120a from above. However, the end portion of the first covering 120a is the second end portion of the first covering 120a. You may be made into the state which overlapped with the edge part of the coating | coated 120b from the upper side.

  Moreover, in said embodiment, although the insulation coating 12 was comprised including the 1st coating 120a and the 2nd coating 120b, the aspect which forms the insulation coating 12 is not restricted to this. For example, the insulating coating 12 may be formed in the following manner. That is, first, a resin material is extruded around the core wire 11 to form an insulating coating with a uniform film thickness that covers the outer periphery of the core wire 11. Then, the insulating coating is peeled off so that the end portion has a stepped shape by using a peeling apparatus provided with two sets of blades arranged at intervals. In the peeling apparatus used here, the first blade disposed on the terminal side of the insulated wire is cut deeply into the insulation coating, and the other second blade is cut shallowly into the insulation coating. Yes. Using this peeling device, the first blade is cut deeply into the insulation coating, and the second blade is cut shallowly into the insulation coating, and then the two sets of blades are moved laterally to the end side of the insulated wire. Strip the insulation coating. Then, the insulation coating is completely peeled off by the first blade, and the core wire 11 is exposed. Thereby, the exposed core part 111 is formed. Further, only the outer layer portion is peeled off while the inner layer portion of the insulating coating is left around the core wire 11 by the second blade. Thereby, the relatively thin second covering portion 12b is formed.

  Moreover, in said embodiment, it is also preferable that the thickness Db of the 2nd coating | coated part 12b is prescribed | regulated in view of the dimension of the existing electric wire (namely, the existing electric wire provided with the insulation coating with the whole thickness uniform). . For example, suppose that existing electric wires having a standard with a thickness of 0.2 mm and a standard with a thickness of 0.3 mm are generally used. In this case, if the thickness Da of the first covering portion 12a is, for example, 0.3 mm, the thickness Db of the second covering portion 12b is preferably 0.2 mm. According to this configuration, the existing terminal corresponding to the existing electric wire (in the above example, the terminal formed corresponding to the electric wire having the insulation coating thickness of 0.2 mm) is used for the insulated electric wire 1 as it is. Is possible.

  Moreover, in said embodiment, although the core wire 11 shall be formed with the some strand, the core wire 11 may be comprised with the single wire of the metal wire.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Insulated electric wire 11 Core wire 11a End part 11b Adjacent part 111 Exposed core part 12 Insulation coating 12a 1st coating | coated part (other part of insulation coating)
12b Second covering portion (end portion of insulating coating)
120a 1st coating 120b 2nd coating 2 Terminal 21 Terminal connection part 22 Core wire crimping part 23 Covering crimping part 3 Electric wire with terminal 9 Connector 90 Cavity 5 Shrinkable tube 101 Insertion electric wire part 102 Non-insertion electric wire part L Insertion electric wire length

Claims (9)

An insulated wire comprising: a core wire; and an insulating coating that covers an outer periphery of the core wire while exposing an end portion of the core wire;
A terminal connected to the terminal on the side where the core wire is exposed in the insulated wire;
With
The thickness of the end portion on the side where the exposed core wire extends in the insulating coating is thinner than the thickness of the other portion in the insulating coating,
Electric wire with terminal. It is an electric wire with a terminal according to claim 1,
The terminal is
A core barrel portion to be crimped to an end portion of the core wire;
A coating barrel portion to be crimped to an end portion of the insulating coating;
An electric wire with a terminal. It is an electric wire with a terminal according to claim 1 or 2,
The end portion of the insulating coating is the portion of the insulating coating that is to be disposed in the cavity in a state where the terminal is normally inserted in the cavity of the connector.
Electric wire with terminal. The electric wire with terminal according to any one of claims 1 to 3,
The insulation coating is
Of the core wire, a first coating covering the outer periphery of the portion excluding the end portion and its adjacent portion;
A second coating that is thinner than the first coating and covers the outer periphery of the adjacent portion;
An electric wire with a terminal. It is an electric wire with a terminal according to claim 4,
The end of the second covering and the end of the first covering overlap,
Electric wire with terminal. Core wire,
An insulating coating that covers an outer periphery of the core wire while exposing an end portion of the core wire;
With
The thickness of the end portion on the side where the exposed core wire extends in the insulating coating is thinner than the thickness of the other portion in the insulating coating,
Insulated wire. a) a step of forming a first coating covering an outer periphery of a portion of the core wire excluding an end portion and an adjacent portion thereof;
b) forming a second coating that is thinner than the first coating and covers the outer periphery of the adjacent portion;
A method for manufacturing an insulated wire, comprising: It is a manufacturing method of the insulated wire according to claim 7,
Step b)
b1) disposing a shrinkable tube that shrinks by heating around the adjacent portion;
b2) forming the second coating by heating and shrinking the shrinkable tube;
A method for manufacturing an insulated wire, comprising: It is a manufacturing method of the insulated wire according to claim 8,
In the step b1), the end of the contraction tube is disposed so as to cover the end of the first coating,
In the step b2), the contraction tube is contracted in a state where an end thereof overlaps an end of the first coating.
Insulated wire manufacturing method.

Images