JP2014220887A - Terminated wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the contact resistance value with an object, in a terminated wire where a flat terminal is formed integrally at the end of a core wire by heating compression.SOLUTION: An LA terminal 5 having a through hole 5a in the center is formed integrally at the tip of a core wire 3, by resistance-welding due to electrification between electrodes pressure-welded to the tip of the core wire 3 folded annularly. Circular bosses 5b concentric with the through hole 5a are formed on the front and back surfaces of the LA terminal 5. When attaching and fixing the LA terminal 5 to an object 9, the male screw 11a of a bolt 11 inserted into the through hole 5a is screwed into the female thread of the attachment hole 9a of the object 9 and fastened. Consequently, the boss 5b on the back surface of the LA terminal 5 comes into contact with the attachment surface 9b of the object 9, thus making the contact area of the LA terminal 5 to the attachment surface 9b constant.

Description

  The present invention relates to a terminalized electric wire in which an end portion of a core wire of an electric wire is formed and a terminal is integrally formed with the core wire.

  Regarding the terminalized electric wire in which the core of the electric wire is formed and the terminal is integrally formed with the core, the present applicant has also proposed in the past that the end of the core is formed into an LA terminal shape by heat compression (for example, a patent) Reference 1).

  The above-mentioned terminalized electric wires can be reduced in number of terminals as parts, and in addition, there is no need to devise a means to connect the terminal to the core wire so that the contact resistance value does not increase. It is superior to the attached wire. In addition, since the core wire is softened and compressed by heating, even a terminal having a through hole at the center, such as an LA terminal, can be easily formed integrally.

JP-A-4-249875

  By the way, when the terminal is integrally formed with the core wire by molding by heat compression, the end portion of the core wire is compressed by the male and female press electrodes, and at the same time, the core wire is heated and softened by energization between both electrodes. At this time, if the core wire material that has softened and wraps around a slight gap between the male mold and the female mold remains as burrs, the contact area with the object to which the terminal is attached changes, resulting in a variation in the contact resistance value. When the surface roughness of the terminal is lowered due to the surface roughness of the mold, the contact resistance value also varies.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to stabilize a contact resistance value with an object in a terminalized electric wire in which a terminal is integrally formed at an end of a core wire by molding by heat compression. It is in providing the terminalized electric wire which can do.

In order to achieve the above object, the terminalized electric wire of the present invention described in claim 1 is:
In the terminalized electric wire in which a flat terminal is integrally formed at the end of the core wire by molding by heat compression,
A contact portion that abuts on the mounting surface of the object in a state where the terminal is mounted and fixed to the object is bulged and formed on at least one plane of the terminal.
It is characterized by that.

  According to the terminalized electric wire of the present invention described in claim 1, when the molded terminal is attached and fixed to the object, only the contact portion formed on the terminal abuts the attachment surface of the object, and the terminals other than the contact portion The part is separated from the mounting surface of the object and does not come into contact.

  Therefore, even if the core material softened by heating goes around the gap of the molding die at the time of molding the terminal and remains as a burr on the molded terminal, if the contact part is in a position different from the place where the burr can be formed In the state where the contact portion is in contact with the mounting surface of the object, the burr is separated from the mounting surface and does not come into contact. Further, if the contact portion is in a place where burrs can be formed, the burrs are absorbed by the bulge forming portion of the contact portion, so that the burrs are formed separately from the contact portions and do not contact the mounting surface of the object.

  Furthermore, even if the surface of the terminal has a surface roughness different from the design value due to the surface roughness of the molding die, the terminal plane does not contact the mounting surface of the object, but is a contact formed by bulging from the terminal plane. Only the part contacts the mounting surface.

  For this reason, even if burrs are generated at the time of molding of the terminal or the surface roughness of the flat surface of the terminal is different from the design value, the contact resistance value with the object does not fluctuate.

  Therefore, when the terminal is integrally formed at the end of the core wire by molding by heat compression to form a terminalized electric wire, the contact resistance value with the object can be stabilized.

  Moreover, the terminalized electric wire of the present invention described in claim 2 is the terminalized electric wire of the present invention described in claim 1, wherein the terminal has a through-hole penetrating the both planes, and the through-hole It is fixedly attached to the object by fastening a bolt inserted into the contact, and the contact portion is configured to have a cylindrical boss concentrically with the through hole and respectively provided on the two planes of the terminal. It is characterized by being.

  According to the terminalized electric wire of the present invention described in claim 2, in the terminalized electric wire of the present invention described in claim 1, since the bosses as the contact portions are respectively erected on both planes of the terminal, Even if this plane is made to face the mounting surface of the object, the boss on either plane will contact the mounting surface. For this reason, a stable contact resistance value can be obtained between the terminal and the object regardless of which direction the terminal is attached and fixed to the object.

  In addition, the boss on the other plane that does not contact the mounting surface of the object is a bolt head inserted into the through hole of the terminal, a nut used in combination with the bolt, or a washer inserted between them and the terminal. And prevent direct contact with their terminal planes. For this reason, it can prevent that a terminal deform | transforms with the clamping force at the time of fastening of a volt | bolt, and, thereby, changes a contact resistance value with a target object.

  Furthermore, the terminalized electric wire of the present invention described in claim 3 is the terminalized electric wire of the present invention described in claim 1 or 2, wherein the terminal has a through-hole penetrating the both planes. It is attached and fixed to the object by fastening a bolt inserted through a through hole, and the contact portion has three or more contacts erected at equal intervals on a concentric circle of the plane of the terminal. It is characterized by being.

  According to the present invention, in a terminalized electric wire in which a terminal is integrally formed at the end of a core wire by molding by heat compression, the contact resistance value with an object can be stabilized.

It is a side view of the terminal-ized electric wire which concerns on 1st Embodiment of this invention. It is the perspective view seen from the upper direction of the terminal-ized electric wire of FIG. It is explanatory drawing of the formation process of the terminal-ized electric wire of FIG. It is sectional drawing which shows the state of the electrode, jig | tool, and core wire in the resistance welding in the formation process of FIG. It is a perspective view of the terminal-ized electric wire which concerns on 2nd Embodiment of this invention.

  The present invention will be described below with reference to the drawings. In addition, the dimension and dimension ratio of each drawing used for description may differ from an actual thing. What is shown in the following drawings is only a concept of the embodiment of the present invention.

  First, with reference to FIG. 1 thru | or FIG. 4, the terminal-ized electric wire which concerns on 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the terminalized electric wire 1 according to the first embodiment is formed by integrally forming a flat LA terminal 5 (corresponding to a terminal in the claims) at the tip portion of the core wire 3. As shown in FIG. 2, it has a through-hole 5a that penetrates both front and back surfaces (corresponding to both planes in the claims). Further, as shown in FIG. 1, bosses 5 b concentric with the through holes 5 a (corresponding to contact points in the claims) are erected on both the front and back surfaces of the LA terminal 5.

  The LA terminal 5 is formed by removing the insulating coating 7 of the terminalized electric wire 1 and exposing the exposed end portion of the core wire 3 in an annular shape and molding it by heat compression. Molding by heating and compression of the tip portion of the core wire 3 folded in an annular shape can be performed, for example, by resistance welding. FIG. 3 is an explanatory view showing a forming process by resistance welding.

  As shown in FIG. 3, in resistance welding for forming the LA terminal 5, the distal end portion of the core wire 3 exposed by removing the insulating coating 7 from the distal end portion of the terminalized electric wire 1 is folded back in an annular shape. Then, a hole forming jig 15a having an outer diameter corresponding to the inner diameter of the through hole 5a of the LA terminal 5 is inserted into the folded portion 3a of the core wire 3, and the folded portion of the core wire 3 corresponds to the outer shape of the LA terminal 5. It arrange | positions in the recessed part 15c of the electric wire holding | suppressing jig 15b to perform. In this state, the upper and lower electrodes 15d, 15e are pressed against the folded portion of the core wire 3 from above and below.

  The state in which the upper and lower electrodes 15d and 15e are in pressure contact with the folded portion of the core wire 3 is the state shown in the cross-sectional view of FIG. 4, and in this state, the upper and lower portions of the hole forming jig 15a protruding from the folded portion 3a of the core wire 3 The ends are inserted into the escape holes 15f and 15g of the electrodes 15d and 15e. As shown in FIG. 3, a concentric annular recess 15h is formed around the escape hole 15g of the lower electrode 15e. An annular recess 15i having the same diameter as the annular recess 15h is also formed around the escape hole 15f of the upper electrode 15d.

  Then, when electricity is applied between the electrodes 15d and 15e by a power source (not shown), the folded portion 3a of the core wire 3 is softened by Joule heat, and the hole forming jig 15a, the recess 15c of the wire pressing jig 15b, the upper electrode 15d, The outer shape of the space defined by the lower electrode 15e is formed. This space has a shape corresponding to the outer shape of the LA terminal 5, and after molding, the LA terminal 5 having the shape shown in FIGS. 1 and 2 is integrally formed at the distal end portion of the core wire 3.

  In other words, the LA terminal 5 is formed by using a molding die composed of the hole forming jig 15a, the wire pressing jig 15b, the upper electrode 15d, and the lower electrode 15e. Note that an insulating or high resistance material having a melting temperature higher than that of the core wire 3 is used for the hole forming jig 15a and the wire pressing jig 15b.

  During the molding described above, the softened material of the core wire 3 may wrap around a slight gap between the escape hole 15g of the lower electrode 15e and the hole forming jig 15a, for example. The material that wraps around the gap remains as burrs along the peripheral edge of the through hole 5a on the back surface of the molded LA terminal 5, and performs burrs (presence / absence) inspection and deburring work after molding. It will be necessary to remove.

  Therefore, in the LA terminal 5 of the present embodiment, the annular recess 15h formed in the lower electrode 15e is formed with a depth larger than the dimension when the above-described burr is formed, and on the back surface of the LA terminal 5, The boss 5b higher than the burr is formed to bulge. Although not shown in FIG. 3, in this embodiment, as shown in FIG. 4, the annular recess 15i of the upper electrode 15d is also formed with the same depth.

  As shown in FIG. 1, the terminalized electric wire 1 in which the LA terminal 5 is integrally formed at the distal end portion of the core wire 3 is attached and fixed to an object 9 having an attachment hole 9a formed on the attachment surface 9b. Here, the attachment hole 9a of the object 9 has an internal thread (not shown), and the external thread portion 11a of the bolt 11 inserted into the through hole 5a of the LA terminal 5 is screwed into the internal thread of the attachment hole 9a. Is done.

  The head 11 b of the bolt 11 is in contact with the boss 5 b on the surface of the LA terminal 5 via the washer 13. By fastening the bolt 11 in this state, the LA terminal 5 can be attached and fixed to the object 9. At this time, the boss 5b on the back surface of the LA terminal 5 contacts the mounting surface 9b of the object 9. When the LA terminal 5 is molded, even if a burr is formed on the back surface of the LA terminal 5 along the peripheral edge of the through hole 5a, the boss 5b on the back surface of the LA terminal 5 higher than the burr is the mounting surface of the object 9. Since it contacts 9b, the burr does not contact the mounting surface 9b.

  Further, for example, even when the surface roughness and the back surface of the LA terminal 5 have different surface roughness from the design value due to the surface roughness of the end surfaces of the upper and lower electrodes 15d and 15e, the surface and the back surface of the LA terminal 5 are attached to the object 9. There is no direct contact with the surface 9b.

  For this reason, the contact area of the LA terminal 5 with respect to the mounting surface 9b of the object 9 is made constant by the area of the tip portion of the boss 5b, and burrs are generated at the time of forming the LA terminal 5, or the surface of the LA terminal 5 and the back surface. Even if the roughness is different from the design value, the contact resistance value with the object 9 does not change.

  Therefore, the contact resistance value with the object 9 can be stabilized when the LA terminal 5 is integrally formed at the distal end portion of the core wire 3 by molding by resistance welding to form the terminalized electric wire 1.

  Note that if the boss 5b is formed so as to bulge out on the surface or back surface of the LA terminal 5 where burrs are generated during molding, the burrs are absorbed by the boss 5b. It can prevent that the contact resistance value with the target object 9 changes in contact with the attachment surface 9b of the target object 9.

  Further, the boss 5b only has to be erected on at least the back surface of the LA terminal 5, and the boss 5b on the front surface may be omitted. However, if both the front and back surfaces of the LA terminal 5 are provided with the bosses 5b, both the bosses 5b must always be attached to the mounting surface 9b of the object 9 regardless of which direction the LA terminal 5 is mounted and fixed. The contact resistance value with the object 9 can be stabilized by contacting with 9b.

  Further, instead of the boss 5b, as in the LA terminal 5A of the second embodiment shown in FIG. 5, three contact portions 5c are provided on the front and back surfaces of the LA terminal 5A at equal intervals concentrically with the through hole 5a. May be. Similarly to the case where the boss 5b is provided, the contact portion 5c is also formed with three hemispherical concave portions (not shown) corresponding to the contact portions 5c in the upper electrode 15d and the lower electrode 15e. When the LA terminal 5 is formed by forming the folded portion of the core wire 3, the bulge can be formed at the same time.

  Even when the contact portion 5c is provided on the LA terminal 5A, only the contact portion 5c is attached to the attachment surface 9b in the state in which the LA terminal 5A is attached and fixed to the object 9, similarly to the boss 5b of the LA terminal 5 of the first embodiment. The contact resistance value with the object 9 can be stabilized regardless of the presence or absence of burrs and the surface roughness of the back surface of the LA terminal 5A.

  Four or more contact portions 5c may be provided at equal intervals, and the contact portions 5c may be provided not only on the back surface of the LA terminal 5A but also on the front surface.

  The position where the boss 5b and the contact portion 5c are provided may be close to the outer peripheral surface of the LA terminals 5 and 5A, or close to the through hole 5a. Furthermore, you may further provide the contact part 5c of 2nd Embodiment with the boss | hub 5b in the surface of the LA terminal 5 of 1st Embodiment, the back surface, or any one surface. In that case, it is preferable that the diameter of the boss 5b and the diameter of the concentric circle of the through hole 5a in which the contact portion 5c is arranged are different so that the positions of the boss 5b and the contact portion 5c do not overlap.

  Moreover, in embodiment mentioned above, the target object 9 which attaches and fixes LA terminal 5 and 5A by the fastening using the volt | bolt 11 was demonstrated. However, for example, a terminalized electric wire to which the present invention is applied can also be used in the case of an object to which an LA terminal is attached and fixed via an adapter, such as a battery post of a vehicle.

  INDUSTRIAL APPLICABILITY The present invention is extremely useful when applied to a terminalized electric wire in which a flat terminal is integrally formed at the end of a core wire by molding by heat compression.

DESCRIPTION OF SYMBOLS 1,1A Terminalized electric wire 3 Core wire 3a Folding part 5, 5A LA terminal 5a Through hole 5b Boss 5c Contact part 7 Insulation coating 9, 9A Object 9a Attachment hole 9b Attachment surface 11 Bolt 11a Male thread part 13 Washer 15a Hole formation jig 15b Wire holding jig 15c Recess 15d, 15e Electrode 15f, 15g Relief hole 15h, 15i Annular recess

Claims (3)

In the terminalized electric wire in which a flat terminal is integrally formed at the end of the core wire by molding by heat compression,
A contact portion that abuts on the mounting surface of the object in a state where the terminal is mounted and fixed to the object is bulged and formed on at least one plane of the terminal.
Terminalized electric wire characterized by this.   The terminal has a through-hole penetrating the both planes, and is fixedly attached to the object by fastening a bolt inserted into the through-hole, and the contact portion is concentric with the through-hole. The terminalized electric wire according to claim 1, wherein the terminalized electric wire is configured to have cylindrical bosses erected on each of the two planes.   The terminal has a through-hole penetrating the both planes, and is fixedly attached to the object by fastening a bolt inserted into the through-hole, and the contact portion is on a concentric circle on the plane of the terminal. The terminalized electric wire according to claim 1, wherein the terminalized electric wire is configured to have three or more contact points standing at intervals.

Images