JP2016001553A - Wire with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for waterproofing the connection of a terminal and a core wire more reliably, in a wire with a terminal for connecting a plurality of wires with one terminal.SOLUTION: A wire with a terminal 10 includes a plurality of wires 12 each including a core wire 14 and a coating 18 formed around the core wire 14, and having a core wire exposed part 20 formed so that the core wire 14 is exposed at the tip thereof, one terminal 30 with which the core wire exposed part 20 of the plurality of wires 12 is connected, and a waterproof member 40 covering the periphery of a portion including the connection of the core wire exposed part 20 and the terminal 30. At a part of the core wire exposed part 20 located closer to the coating 18 side than the terminal 30, an intermediate junction 22 is formed so as to integrate the core wire exposed part 20 of the plurality of wires 12, and the end of the waterproof member 40 on the coating 18 side is located at the intermediate junction 22 or closer to the coating 18 than the intermediate junction 22.

Description

  The present invention relates to a technique for waterproofing a terminal-attached electric wire.

  As a technique for waterproofing a terminal-attached electric wire, for example, there is an earth terminal fitting described in Patent Document 1. The grounding terminal fitting is a heat shrinkable tube that is contracted and adhered around the core wire and the portion of the terminal to which the core wire is connected.

Japanese Patent Laid-Open No. 10-289745

  By the way, there exists an electric wire with a terminal which connects a some electric wire to one terminal. In this case, even if a heat-shrinkable tube is used as in Patent Document 1, a gap is generated in the other part between the plurality of electric wires, and liquid enters the gap, so that the liquid enters the connection part between the terminal and the core wire. May reach.

  Furthermore, even when molding so that there is no gap in the other part between the plurality of electric wires, when a force that tears the plurality of electric wires is applied, the molded part is torn, and a gap is generated, Similarly to the above, the liquid that has entered from the gap may reach the connection portion between the terminal and the core wire.

  Then, an object of this invention is to provide the technique which can waterproof more reliably the connection part of a terminal and a core wire in the electric wire with a terminal which connects a some electric wire to one terminal.

  In order to solve the above-described problem, the electric wire with terminal according to the first aspect includes a core wire and a covering portion formed around the core wire, and a core wire exposed portion is formed so that the core wire is exposed at a tip thereof. A plurality of electric wires, one terminal to which the core wire exposed portion of the plurality of electric wires is connected, and a waterproof member that covers a periphery of a portion including a connection portion between the core wire exposed portion and the terminal, and An intermediate joint portion joined so that the core wire exposed portions of the plurality of electric wires are united is formed in a portion of the core wire exposed portion that is located closer to the covering portion than the terminal, and the covering of the waterproof member is formed The end on the part side is located closer to the intermediate joint or the covering part than it.

  The electric wire with a terminal according to the second aspect is the electric wire with a terminal according to the first aspect, and a tip joint portion formed so that a core wire exposed portion on the tip side from the intermediate joint portion is integrated is formed. Has been.

  The electric wire with a terminal which concerns on a 3rd aspect is an electric wire with a terminal which concerns on the 1st or 2nd aspect, Comprising: The said waterproof member is a heat contraction tube.

  A terminal-attached electric wire according to a fourth aspect is the electric wire with a terminal according to any one of the first to third aspects, wherein the intermediate joint portion is cut along a direction orthogonal to the longitudinal direction of the electric wire. The cross section is circular or elliptical.

  The electric wire with a terminal which concerns on a 5th aspect is an electric wire with a terminal which concerns on any one 1st-4th aspect, Comprising: The said intermediate junction part is formed by ultrasonic welding.

  According to the electric wire with a terminal concerning the 1st-the 5th mode, the intermediate joined part joined so that the core wire of a plurality of electric wires may be united with at least the portion located in the covering part side rather than the terminal among the exposed part of the core wire. Since the end of the waterproof member on the cover portion side is located closer to the intermediate joint portion or the cover portion than that, the liquid can be prevented from entering from the gap between the core wires. Thereby, in the electric wire with a terminal which connects a plurality of electric wires to one terminal, the connection part of a terminal and a core wire can be waterproofed more certainly.

  In particular, according to the terminal-attached electric wire according to the second aspect, since the tip joint portion joined so that the core wire exposed portion on the tip side from the intermediate joint portion is integrated, each core wire is more reliably Connected to the terminal. Thereby, the electroconductivity of an electric wire with a terminal can be improved.

  In particular, according to the terminal-attached electric wire according to the third aspect, the waterproof member can be easily attached because the waterproof member is a heat-shrinkable tube. Further, when contracting, the core wire is more securely adhered to the exposed portion of the core wire or the terminal.

  In particular, according to the terminal-attached electric wire according to the fourth aspect, since the cross section obtained by cutting the intermediate joint portion along the direction orthogonal to the longitudinal direction of the electric wire is circular, it is waterproof when the waterproof member is a heat-shrinkable tube. It becomes easy to adhere the member to the intermediate joint. Thereby, the penetration | invasion of the liquid from the clearance gap between a waterproof member and an intermediate junction part can be suppressed.

  In particular, according to the electric wire with a terminal concerning the 5th mode, since an intermediate joined part is formed by ultrasonic welding, core wires are directly joined and integrated. Thereby, the other member which connects core wires is unnecessary. Moreover, since a metal does not melt | dissolve completely, it can suppress that the cross-sectional area of a core wire reduces.

It is a top view which shows the electric wire with a terminal which concerns on embodiment. It is the schematic sectional drawing cut | disconnected along the II-II line | wire of FIG. It is the schematic sectional drawing cut | disconnected along the III-III line of FIG. It is the schematic sectional drawing cut | disconnected along the IV-IV line of FIG. It is a top view which shows the modification of an electric wire with a terminal. It is a top view which shows another modification of an electric wire with a terminal.

{Embodiment}
Hereinafter, the electric wire 10 with a terminal which concerns on embodiment is demonstrated. Drawing 1 is a top view showing electric wire 10 with a terminal concerning an embodiment. 2 is a schematic cross-sectional view taken along line II-II in FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG.

  The terminal-attached electric wire 10 according to the embodiment includes a plurality of electric wires 12, one terminal 30, and a waterproof member 40.

  The electric wire 12 includes a core wire 14 and a covering portion 18 formed around the core wire 14. The core wire 14 is described as an example in which seven strands 16 made of a conductive material such as copper or aluminum are gathered here, but there is at least one strand 16 forming the core wire 14. That's fine. The covering portion 18 is formed by extruding an insulating material around the core wire 14 by an extrusion device or the like. A core wire exposed portion 20 is formed at the tip of the electric wire 12 so that the core wire 14 is exposed. The core wire exposed portion 20 is formed by peeling off the covering portion 18 at the distal end portion of the electric wire 12.

  The electric wire 12 is used to electrically connect various electric devices mounted on a vehicle or the like in a state where the electric wire 12 is arranged at a location to be arranged on the vehicle or the like. Here, the electric wire 12 is demonstrated by the example connected to earth | ground via the terminal 30 provided in the edge part.

  The core 30 exposed portions 20 of the plurality of electric wires 12 are connected to the terminal 30. Here, the terminal 30 includes a wire fixing portion 32 and a connection portion 36. Here, an example in which the terminal 30 is grounded will be described.

  The wire fixing portion 32 is a portion to which the core wire exposed portions 20 of the plurality of wires 12 are connected. More specifically, here, the electric wire fixing portion 32 includes a plate-like portion 33 formed in a plate shape. Of the core wire exposed portion 20, a tip joint portion 24 described later is joined to the principal surface on one side of the plate-like portion 33 by ultrasonic welding.

  But the shape of the electric wire fixing | fixed part 32 and the fixing method of the core wire exposed part 20 are not restricted above. For example, as in a second modification described later, a pair of side wall portions 34 may be formed on both sides of the plate-like portion 33, and the electric wires 12 may be fixed by crimping the side wall portions 34. Further, for example, even when the electric wire 12 is fixed by ultrasonic welding, a pair of side wall portions having a height lower than that of the second modified example is formed, and the electric wire 12 does not drop from the plate-like portion 33 during welding. Thus, it may be formed so as to be supported by the side wall portion.

  The connection part 36 is a part which connects the terminal 30 to the other party's terminal or apparatus. Here, as the connecting portion 36, the plate-like portion 33 of the electric wire fixing portion 32 is extended, and the portion extending from the electric wire fixing portion 32 of the plate-like portion 33 penetrates from the one main surface to the other main surface. A through-hole 38 is formed. By inserting a stud bolt or the like standing on the grounding member into the through hole 38 and tightening a nut on the stud bolt or the like, the terminal 30 comes into contact with the grounding member, and the terminal 30 and the electric wire connected to the terminal 30 are connected. 12 is grounded.

  The terminal 30 does not need to be used for grounding, and the shape of the connecting portion 36 is not limited to the above. For example, the terminal 30 may be connected to the counterpart terminal. At that time, the terminal 30 and the counterpart terminal may be connected by a combination of so-called male type and female type. That is, as long as the terminal 30 connects the plurality of electric wires 12 to the same portion of the one terminal 30, the use and configuration thereof are not limited to those described above.

  An intermediate joint portion 22 and a tip joint portion 24 are formed at a portion where the core wire exposed portions 20 of the plurality of electric wires 12 are combined. In addition, although demonstrated here in the example in which each junction part 22 and 24 is formed in the part which the two electric wires 12 join, the number of the electric wires 12 connected to the terminal 30 may be three or more. .

  The intermediate joint portion 22 is formed in a portion of the core wire exposed portion 20 located closer to the covering portion 18 than the terminal 30 and is joined so that the core wire exposed portions 20 of the plurality of electric wires 12 are integrated.

  The tip joint portion 24 is formed in a portion of the core wire exposed portion 20 located on the tip side of the intermediate joint portion 22 and joined so that the core wire exposed portions 20 of the plurality of electric wires 12 are integrated.

  Here, the methods for joining metals can be broadly divided into three types: fusion welding (also referred to as liquid phase welding), pressure welding (also referred to as solid phase welding), and brazing. Here, the intermediate joint portion 22 and the tip joint portion 24 are formed by ultrasonic welding which is a kind of pressure welding, but may be formed by other joining methods such as resistance welding or arc welding. It may be formed by fusion welding such as soldering or soldering.

  However, when the intermediate joint portion 22 and the tip joint portion 24 are formed by ultrasonic welding, the core wires 14 are directly joined and integrated. Thereby, the other member which connects the core wires 14 is unnecessary. Moreover, since a metal does not melt | dissolve completely, it can suppress that the cross-sectional area of the core wire 14 reduces.

  However, although both the intermediate | middle junction part 22 and the front-end | tip junction part 24 are formed here, this is not essential. It is sufficient that at least the intermediate joint portion 22 is formed, and the tip joint portion 24 may not be formed. The intermediate joint portion 22 is formed, and the end of the waterproof member 40 on the covering portion 18 side is positioned closer to the intermediate joint portion 22 or the covering portion 18 than that, so that liquid such as water is cored 14 (elementary wire 16). It can suppress entering from the clearance gap between. Thereby, in the electric wire 10 with a terminal which connects the some electric wire 12 to the one terminal 30, the connection part of the terminal 30 and the core wire 14 can be waterproofed more reliably.

  Moreover, if the front-end | tip junction part 24 is formed, each core wire 14 (each strand 16) will be connected to the terminal 30 more reliably. Thereby, the electroconductivity of the electric wire 10 with a terminal can be improved.

  Moreover, although the intermediate | middle junction part 22 and the front-end | tip junction part 24 are both formed by the same joining method (here ultrasonic welding) here, this is not essential. For example, the intermediate joint portion 22 and the tip joint portion 24 may be formed by different methods such that the intermediate joint portion 22 is joined by soldering and the tip joint portion 24 is joined by ultrasonic welding. Good.

  In addition, here, since the tip end side is joined all at once from the portion where the core wire exposed portions 20 of the two electric wires 12 join, the intermediate joint portion 22 and the tip joint portion 24 are integrally formed. Yes. For this reason, in the stage before connecting the electric wire 12 to the terminal 30, both cannot be clearly separated, and after the electric wire 12 is connected to the terminal 30, the portion connected to the terminal 30 is connected to the tip joint portion 24. The portion protruding from the terminal 30 without being bonded to the terminal 30 is used as the intermediate bonding portion 22.

  However, it is not essential to join the tip side all at once from the portion where the core wire exposed portions 20 of the two electric wires 12 merge. For example, only the intermediate joint portion 22 is joined first, and the tip joint portion 24 is When the electric wire 12 is connected to the terminal 30 by bonding, it may be formed at the same time. At this time, there may be a portion that is not joined between the intermediate joint 22 and the tip joint 24.

  Here, the intermediate joint 22 and the tip joint 24 are formed in advance and then connected to the terminal 30. However, the intermediate joint 22 and the tip joint 24 are formed and connected to the terminal. May be performed simultaneously in one welding operation.

  The cross section obtained by cutting the intermediate joint portion 22 along the direction orthogonal to the longitudinal direction of the electric wire 12 is circular or elliptical. Specifically, when the intermediate joint portion 22 is formed, a horn having a pressing surface formed in an arc shape in a state where the combined core wire exposed portion 20 is held by an anvil having a holding portion formed in an arc shape, etc. Ultrasonic bonding while applying pressure. Thereby, the cross section cut | disconnected along the direction orthogonal to the longitudinal direction of the electric wire 12 among the intermediate junction parts 22 becomes circular or elliptical.

  In addition, when employ | adopting another joining method, the cross section of the intermediate junction part 22 can be made circular or an ellipse according to the joining method. For example, when the intermediate joint portion 22 is formed by soldering, the inner peripheral surface of the soldered portion is circular or elliptical at a temperature that is lower than the melting point of the solder and has a viscosity at which the solder is easily deformable. What is necessary is just to deform | transform by attaching a shape member and applying a pressure.

  In addition, about the front-end | tip junction part 24, the cross section may be what kind of shape. Here, when the tip bonding portion 24 is ultrasonically bonded to the terminal 30, the cross section thereof is formed in a rectangular shape. However, when the tip joint portion 24 is connected to the terminal 30 by crimping, the cross section may be deformed depending on the manner of crimping. Further, for example, it is conceivable that the cross section of the intermediate joint portion 22 is formed so as to be circular at the same time, and the cross section remains circular.

  Further, the intermediate joint portion 22 is not necessarily required to have a circular or oval cross section, and may be a rectangle like the tip joint portion 24, or may be another square shape. However, when the cross section of the intermediate joint portion 22 is circular or elliptical, the intrusion of liquid such as water from between the waterproof member 40 and the intermediate joint portion 22 can be more reliably suppressed.

  Specifically, when the waterproof member 40 is a heat-shrinkable tube 42 formed in a cylindrical shape as will be described later, and the edge portion on one side thereof is positioned at the intermediate joint portion 22, the heat-shrinkable tube 42. The edge is more likely to come into close contact with the intermediate joint portion 22 when the shrinkage occurs. Thereby, infiltration of liquids, such as water from between the intermediate junction part 22 and the heat contraction tube 42, can be suppressed more reliably.

  The waterproof member 40 covers the periphery of the portion including the connection portion between the core wire exposed portion 20 and the terminal 30. Specifically, the end portion of the waterproof member 40 on the cover portion 18 side is positioned closer to the cover portion 18 than the intermediate joint portion 22 or more.

  More specifically, the end portion of the waterproof member 40 on the side of the covering portion 18 is in close contact with the periphery of the intermediate joint portion 22, and water or the like from between the waterproof member 40 and the intermediate joint portion 22 is here. Suppresses the intrusion. Further, the end of the waterproof member 40 on the connection part 36 side is in close contact with the periphery of the part on the connection part 36 side of the wire fixing part 32 than the part to which the core wire exposed part 20 is connected. Intrusion of water or the like from between 40 and the wire fixing portion 32 is suppressed.

  At this time, an adhesive layer or the like is provided between the waterproof member 40 and the intermediate joint portion 22 or the wire fixing portion 32 by applying an adhesive or the like to the inner surface of the end portion of the waterproof member 40. Preferably it is. Thereby, the waterproof member 40 and the intermediate | middle junction part 22 or the electric wire fixing | fixed part 32 can be reliably fixed without a clearance gap. In particular, when the intermediate joint portion 22 is formed by ultrasonic welding, there is a risk that irregularities are formed on the surface thereof. Even in this case, by providing an adhesive layer made of an adhesive or the like, the adhesive or the like can enter the concave portion on the surface, and the gap between the waterproof member 40 and the joint portion can be filled more reliably.

  More specifically, here, the waterproof member 40 is a heat-shrinkable tube 42. The heat shrinkable tube 42 is formed in a cylindrical shape from a resin material having heat shrinkability. The heat-shrinkable tube 42 is formed so as to allow the terminal 30 and the joint portion to pass through before shrinkage. Then, the heat-shrinkable tube 42 before shrinkage is heated and gradually shrinks in a state where the heat-shrinkable tube 42 is covered with the wire fixing part 32 and the joining parts 22 and 24. Eventually, the heat-shrinkable tube 42 contracts until it comes into close contact with the wire fixing portion 32 and the intermediate joint portion 22. Thereby, it can suppress that liquids, such as water, permeate from between the heat contraction tube 42 and the electric wire fixing | fixed part 32 or the core wire exposed part 20. FIG.

  However, it is not essential that the waterproof member 40 is the heat shrinkable tube 42. For example, as a waterproof member, a sheet-like member may be wound around the terminal 30 and the core wire exposed portion 20 via an adhesive and fixed. At this time, the sheet-like member may be heat-shrinkable or may not be heat-shrinkable. However, if the waterproof member 40 is the heat-shrinkable tube 42, the waterproof member 40 can be easily attached. Further, when contracting, the waterproof member 40 is more intimately adhered to the core wire exposed portion 20 or the terminal 30.

  Here, in the waterproof member 40, the core wire 14 is formed of aluminum or an aluminum alloy or the like, and the terminal 30 is formed of copper or copper alloy or the like as a material. Provided to suppress corrosion between metals. However, the waterproof member 40 may be provided for other purposes. Further, even when the purpose is to suppress corrosion, it is not essential that the core wire 14 and the terminal 30 are formed of different metals, and the core wire 14 and the terminal 30 are of the same kind such as copper or aluminum. It may be formed of metal. Even in this case, the provision of the waterproof member 40 can suppress corrosion that occurs when the core wire 14 or the terminal 30 is tin-plated or the like. That is, the waterproof member 40 may be provided at a portion where waterproofing is preferably performed at the connection portion between the terminal 30 and the core wire 14.

{Modifications}
Next, each modification of the electric wire 10 with a terminal which concerns on embodiment is demonstrated. FIG. 5 is a plan view showing a modified example (first modified example) of the terminal-attached electric wire 10. FIG. 6 is a plan view showing another modified example (second modified example) of the terminal-attached electric wire 10. In the description of each modification, the same components as those described in the embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the electric wire with terminal 10A according to the first modification, the dimension of the waterproof member 40A is different from the dimension of the waterproof member 40 of the electric wire with terminal 10 according to the embodiment. Specifically, the waterproof member 40A is a heat-shrinkable tube 42A, and the dimensions thereof are set so that the rear end of the waterproof member 40A covers the covering portion 18 of each electric wire 12. At this time, a portion of the waterproof member 40 </ b> A located at the intermediate joint portion 22 is in close contact with the intermediate joint portion 22.

  Thereby, since the core wire exposed part 20 is completely covered by the waterproof member 40A, it is possible to suppress the appearance from being damaged. Moreover, it can suppress that water etc. apply directly to the core wire exposed part 20. FIG.

  In this case, the waterproof member 40 </ b> A is not completely adhered between the covering portions 18 of the plurality of electric wires 12, that is, the other portion generated by connecting the plurality of electric wires 12 to one terminal 30. There is a possibility that there is a part where a gap is generated. For this reason, water or the like may enter the waterproof member 40A from the gap. However, even in this case, the intermediate joint 22 and the waterproof member 40A are in close contact with each other, and there is no gap between the core wires 14 (between the strands 16) in the intermediate joint 22, so that the end on the covering portion 18 side Water or the like that has entered the waterproof member 40 </ b> A from the portion can be kept on the covering portion 18 side from the intermediate joint portion 22. Thereby, it can suppress that water etc. reach the connection part of the core wire exposure part 20 and the terminal 30 exceeding the intermediate junction part 22. FIG.

  In the electric wire with terminal 10B according to the second modification, the fixing method between the terminal 30B and the core wire 14 is different from the fixing method between the terminal 30 and the core wire 14 in the electric wire with terminal 10 according to the embodiment. Specifically, the terminal 30 </ b> B of the terminal-attached electric wire 10 </ b> B is crimped to the electric wire 12.

  More specifically, the electric wire fixing portion 32B of the terminal 30B is formed with a pair of side wall portions 34 erected on the main surface of the plate-like portion 33 from both ends in the width direction of the plate-like portion 33. Then, in a state where the core wire exposed portion 20 is positioned between the pair of side wall portions 34 on the main surface of the plate-like portion 33, the side wall portion 34 is tilted to the electric wire 12 side and crimped, whereby the terminal is connected to the electric wire 12. 30B is crimped.

  When the terminal 30B is pressure-bonded to the electric wire 12, when the tip joint 24 is formed at the same time as the intermediate joint 22 in advance by ultrasonic bonding or the like, the ultrasonic bonding is again performed at the time of bonding to the terminal 30B. There is no need to do. Thereby, the possibility that quality may deteriorate by repeatedly performing ultrasonic bonding on the same portion can be suppressed.

  In addition, although it crimps | bonds so that a pair of side wall part 34 may not overlap here, you may be crimped | bonded so that the other side wall part 34 may overlap on one side wall part 34. FIG.

  In addition, each structure demonstrated by the said embodiment and each modification can be suitably combined unless it mutually contradicts.

  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.

10, 10A, 10B Electric wire with terminal 12 Electric wire 14 Core wire 16 Elementary wire 18 Covering portion 20 Core wire exposed portion 22 Intermediate joint portion 24 Tip joint portion 30, 30B Terminal 32 Electric wire fixing portion 33 Plate portion 34 Side wall portion 36 Connection portion 38 Hole 40, 40A waterproof member 42, 42A heat shrinkable tube

Claims (5)

A plurality of electric wires including a core wire and a covering portion formed around the core wire, wherein the core wire exposed portion is formed such that the core wire is exposed at a tip thereof;
One terminal to which the core wire exposed portion of the plurality of electric wires is connected;
A waterproof member covering the periphery of a portion including a connecting portion between the core wire exposed portion and the terminal;
With
In the core wire exposed portion, a portion located closer to the covering portion than the terminal is formed with an intermediate joint portion joined so that the core wire exposed portions of the plurality of electric wires are integrated,
An end portion of the waterproof member on the side of the covering portion is a terminal-attached electric wire located closer to the intermediate joint portion or to the covering portion than that of the intermediate joint portion. It is an electric wire with a terminal according to claim 1,
The electric wire with a terminal in which the front-end | tip junction part joined so that the core wire exposure part of the front end side rather than the said intermediate | middle junction part may be united is formed. It is an electric wire with a terminal according to claim 1 or claim 2,
An electric wire with a terminal, wherein the waterproof member is a heat shrinkable tube. It is an electric wire with a terminal given in any 1 paragraph of Claims 1-3,
The electric wire with a terminal whose cross section which cut | disconnected the said intermediate junction part along the direction orthogonal to the longitudinal direction of the said electric wire is circular or an ellipse. It is an electric wire with a terminal given in any 1 paragraph of Claims 1-4,
An electric wire with a terminal, wherein the intermediate joint is formed by ultrasonic welding.

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