JP6374630B1 - Connection method between lead wire and connection terminal - Google Patents

Abstract

An enamel-coated lead wire can be more uniformly pressurized by a connection terminal for melting and discharging the enamel coating, and the shape of the connection terminal after completion of connection is made a highly versatile cylindrical shape. A leading end of a wire bundle in which a large number of enamel-coated conducting wires are bundled is inserted into a connecting terminal having a cylindrical shape at least at the leading end. By the first molding dies 21 and 22, the groove 11 that extends in the axial direction of the connection terminal 10 and is opened at the tip of the connection terminal is formed in a part of the connection terminal 10 in the circumferential direction. The second molding dies 31, 32 are heated while pressurizing the connection terminal 10 to melt the enamel coating and discharge it to the outside of the connection terminal 10. Further, the groove portion 10 is crushed and deformed in the circumferential direction of the connection terminal 10 by pressurization by the second forming dies 31 and 32, and is formed into a cylindrical shape in which at least the tip end side of the connection terminal 10 is reduced in diameter. [Selection] Figure 7

Description

  The present invention relates to a method for connecting a conductive wire and a connection terminal.

  Connection terminals are connected to a wire bundle in which a large number of enamel-coated wires are bundled. In this case, fusing is performed by energizing and heating the connection terminals into which a large number of enamel-coated conductors are inserted, so that the enamel coating is melted and discharged to the outside of the connection terminals. In addition to electrical connection, connection to a connection terminal is also performed (see Patent Documents 1 and 2).

Japanese Patent No. 4912425 Japanese Patent No. 5385687

  When performing fusing, a cylindrical connector is generally used as a connection terminal into which a large number of enamel-coated conductors are inserted. And when pressurizing the connection terminal, it is difficult to reduce the diameter by holding the cylinder as it is, so the cross-sectional shape of the connection terminal after fusing is a flat shape as shown in FIG. As shown in FIG. 6 and FIG. 7 of Patent Document 2, an extra shape when the diameter is reduced is an irregular shape protruding outward in the radial direction.

  The above-described method of press-forming the connection terminals into a flat shape or an irregular shape has room for improvement in that a large number of enamel-coated conductive wires are uniformly pressed. In addition, it is not preferable that the connection terminal has a flat shape or a different shape from the viewpoint of versatility when the connection terminal is connected to other devices.

  The present invention has been made in consideration of the above-described circumstances, and its purpose is to make it possible to more uniformly press a plurality of enamel-coated conductors with connecting terminals in order to melt and discharge the enamel coating. The object of the present invention is to provide a connection method between a lead wire and a connection terminal so that the shape of the connection terminal can be made into a highly versatile cylindrical shape.

In order to achieve the above object, the following solution is adopted in the present invention. That is, as described in claim 1,
A first step of inserting a distal end portion of a bundle of conductive wires bundled with a large number of enamel-coated conductive wires into a connection terminal having a cylindrical shape at least at the distal end portion;
After the first step, the first molding die is used to press-mold a groove portion extending in the axial direction of the connection terminal and opened at the tip of the connection terminal in a part of the circumferential direction of the connection terminal. Steps,
After the second step, a third step of pressurizing and heating the connection terminal by a second mold to melt the enamel-coated conductive wire and discharge it to the outside of the connection terminal;
With
In the third step, the groove is deformed so as to be crushed in the circumferential direction of the connection terminal by pressurization by the second molding die, and at least the tip end side of the connection terminal is reduced in diameter. Molding is performed,
It is like that.

  According to the above solution, in the third step, the connection terminal is pressed so as to be directed toward the radial center over the entire length in the circumferential direction, and a large number of enamel-coated conductive wires are pressed almost uniformly, The coating can be removed almost equally. Moreover, since the connection terminal after completion of the connection has a cylindrical shape at least at the tip side, the connection terminal is highly versatile when connecting other devices or other connection parts.

A preferred mode based on the above solution is as follows. That is,
In the third step, fusing is performed in which a heating current is supplied to the connection terminal through the second mold while being pressed by the second mold (corresponding to claim 2). In this case, the enamel coating can be discharged to the outside of the connection terminal by fusing that is generally performed.

The connection terminal used in the first step is a cylindrical shape having the same outer diameter over its entire length in the axial direction,
In the second step, the groove is formed so as to extend over the entire axial length of the connection terminal,
In the state after the third step, the outer peripheral shape of the connection terminal is a cylindrical shape having the same outer diameter over the entire axial length of the connection terminal.
(Corresponding to claim 3). In this case, the connection terminal obtained after completion of the connection can be a cylindrical shape whose diameter is reduced over the entire length while using the simplest and highly versatile cylindrical connection terminal.

The connection terminal used in the first step is such that at least the inner diameter of one end thereof is gradually expanded toward the opening end surface,
In the first step, the wire bundle is performed from the one end side where the inner diameter of the connection terminal is expanded,
(Corresponding to claim 4). In this case, the conductor bundle can be smoothly inserted into the connection terminal. Further, the bending resistance of the conductor bundle can be improved after the connection is completed.

  In the second step, the groove is formed such that the shape along the cross section thereof is an arc shape (corresponding to claim 5). In this case, at the time of pressurization in the third step, the conductor bundle is directed almost uniformly from the entire length in the circumferential direction of the connection terminal while preventing a large pressing force from acting locally on the connection terminal. This is preferable for pressing.

  In the second step, only one groove is formed (corresponding to claim 6). In this case, it is preferable to form the groove as easily as possible.

  In the second step, a plurality of the groove portions are formed at substantially equal intervals in the circumferential direction of the connection terminal (corresponding to claim 7). In this case, it is preferable for sufficiently reducing the diameter.

In the second step, only one or two grooves are formed at intervals of approximately 180 degrees in the circumferential direction of the connection terminal,
In the third step, the connection terminal is pressurized from a direction substantially orthogonal to the indentation direction of the groove portion.
This is done (corresponding to claim 8). In this case, the pressing direction by the first mold is set as a direction in which the groove portion is easily crushed, and this is preferable for easily and reliably crushing and deforming the groove portion in a desired direction while using a simple first mold.

After the third step, a fourth step of fitting a fitting portion of another connection component on the outer periphery of the connection terminal;
After the fourth step, a fifth step of fixing the fitting portion to the connection terminal by caulking,
In addition,
(Corresponding to claim 9). In this case, it is preferable to use another connection component to easily connect to other devices. Further, the connection of another connection component to the connection terminal can be easily performed by caulking.

In the first step, the connection terminal to be used is formed into a shape in which a distal end portion is a cylindrical portion having a cylindrical shape and a base end portion is a trumpet shape extending in a trumpet shape, and the wire bundle is Inserted from the base end side of the connection terminal,
In the second step, the groove is formed in the cylindrical portion,
In the third step, pressure is applied to the cylindrical portion, and in a state after the third step, the cylindrical portion has a reduced diameter.
(Corresponding to claim 10). In this case, the conductor bundle can be inserted into the connection terminal very smoothly. Moreover, since the tip end side of the connection terminal is cylindrical after the connection is completed, versatility is also ensured. Further, the bending resistance of the conductor bundle can be improved after the connection is completed.

  The connection terminal used in the first step has a continuous shape over the entire length in the circumferential direction without having a cut in the circumferential direction (corresponding to claim 11). In this case, as compared with the case where the connection terminal has a cut in the circumferential direction, the pressing force is effectively used as a force that presses the wire bundle almost uniformly toward the center at the time of pressurization by the second mold. can do. In addition, there is little variation in quality after the diameter reduction, the return to the diameter increasing direction after the diameter reduction can be reduced, and further, it is possible to prevent a part of the conductive wire from protruding from the cut.

The first mold comprises a first lower mold and a first upper mold that is driven to reciprocate in the vertical direction,
In the first lower mold, a receiving surface for receiving the connection terminal is formed by forming a semicircular arc-shaped recess along the cross-section,
A convex portion having a shape corresponding to the groove portion is formed on the first upper mold.
This is done (corresponding to claim 12). In this case, the groove portion can be formed using a simple press machine that is moved up and down.

The second mold comprises a second lower mold and a second upper mold that is driven to reciprocate in the vertical direction,
Each of the second lower mold and the second upper mold is formed with a molding surface having a semicircular arc-shaped recess along the cross section.
(Corresponding to claim 13). In this case, the connecting terminal can be formed into a reduced diameter cylindrical shape using a simple press machine that is moved up and down.

  According to the present invention, in order to melt and discharge the enamel coating, a large number of enamel-coated conductors can be more uniformly pressurized by the connection terminal, and the shape of the connection terminal is finally made a highly versatile cylindrical shape. Can do.

The side view which shows the process in which the wire bundle which consists of many enamel coating | coated conductor wires is exposed in the front-end | tip part of a litz wire. The side view which shows the process in which conducting wire bundle is inserted in a connection terminal. Side surface sectional drawing which shows the detail of a connection terminal. The figure which shows the example of a shape of a groove part. The figure which shows the example of the 1st shaping | molding die which forms the groove part shown in FIG. The figure which shows the condition which arrange | positions a connection terminal in the 2nd shaping | molding die which performs pressurization and electric heating. The figure which shows the state which is pressurizing from the state of FIG. The figure which shows the shape of the connection terminal after pressure molding. The side view which shows the change condition of the outer diameter of a connection terminal. The figure corresponding to Drawing 4 showing the 2nd embodiment of the present invention. The figure which shows the example of the 1st shaping | molding die which forms the groove part shown in FIG. The figure which shows the 3rd Embodiment of this invention, and respond | corresponds to FIG. The figure corresponding to Drawing 4 showing the 4th embodiment of the present invention. The figure which shows the example of the 1st shaping | molding die which forms the groove part shown in FIG. The 5th Embodiment of this invention is shown, and side sectional drawing corresponding to FIG. The figure which shows the 6th Embodiment of this invention, and shows the process of connecting another connection component with respect to a connection terminal. The figure which shows the state after a connection with a connection terminal, when the cross-sectional shape of the fitting part in another connection component is annular. The figure which shows the state after a connection with a connection terminal in the case where the cross-sectional shape of the fitting part in another connection component is a square cyclic | annular form. The figure which shows the state after a connection with a connection terminal in the case where the cross-sectional shape of the fitting part in another connection component is a regular hexagonal cyclic | annular form. The 7th Embodiment of this invention is shown, and the figure corresponding to FIG.

  In FIG. 1, 1 is a litz wire as wiring. In the figure, (a) shows a state in which the inner wire bundle is covered with the outer covering layer 2 up to the end. (B) shows a state in which the end portion (tip portion) of the outer coating layer 2 is removed and the tip portion of the inner wire bundle 3 is exposed. And the connection terminal mentioned later is connected to the front-end | tip part of this exposed conducting wire bundle 3. FIG. The conductor bundle 3 is formed by twisting a large number (for example, several tens to thousands) of enamel-coated conductors into a single bundle. In addition, the material of an enamel and conducting wire can be selected suitably, and is not specifically limited.

  FIG. 2 shows the exposed wire bundle 3 and connection terminals 10. As shown in FIG. 3, the connection terminal 10 has a cylindrical shape in which the inner diameter and the outer diameter are the same over the entire length. In the figure, (a) shows a state before the conductor bundle 3 is inserted into the connection terminal 10, and (b) shows a state where the exposed conductor bundle 3 is inserted into the connection terminal 10. It is.

  The connection terminal 10 is a metal pipe having good conductivity (a copper pipe in the embodiment). Note that the connection terminal 10 is continuous over its entire length in the circumferential direction, and has no cut along the way. In addition, the material which comprises the connection terminal 10 can be suitably selected from not only copper but a metal with favorable electroconductivity.

  The inner diameter of the connection terminal 10 is larger than the outer diameter of the exposed wire bundle 3 so that the wire bundle 3 is smoothly inserted into the connection terminal 10. For this reason, the outer diameter of the connection terminal 10 is larger than the outer diameter of the outer coating layer 2. Note that the conductor bundle 3 exposed to the outside tends to spread slightly outward in the radial direction due to the fluffing of a large number of enamel-coated conductors constituting the conductor bundle 3. Therefore, the inner diameter of the connection terminal 10 is set in consideration of the spread of the conductor bundle 3.

  As shown in FIG. 4, a groove 11 is formed in the connection terminal 10 into which the conductor bundle 3 is inserted. The groove 11 is formed at one place in the circumferential direction of the connection terminal 10. Moreover, the groove part 11 is extended over the axial direction full length of the connection terminal 10 (the groove part 11 is opened by both the one end side and other end side of the connection terminal 10). As for the cross-sectional shape of the groove part 11, the shape along the inner surface is made into circular arc shape (arc or substantially circular arc). The groove 11 is formed to be concave toward the center of the connection terminal 10. In FIG. 4, each enamel-coated lead wire is indicated by reference numeral 3a.

  For example, as shown in FIG. 5, the groove 11 can be molded using a pair of upper and lower molding dies 21 and 22 as a first molding die. That is, the molding dies 21 and 22 have molding surfaces 21 a and 22 a having curvature radii set corresponding to the outer diameters of the connection terminals 10. That is, the molding surfaces 21a and 22a are formed as recesses whose shape along the cross section is a semicircular arc. A convex portion 21 b having a shape corresponding to the groove 11 is further formed on the molding surface 21 a of the upper molding die 21. By placing the connection terminal 10 on the molding surface 22 a of the molding die 22 as a receiving surface and lowering the molding die 21, the groove 11 is formed in the connection terminal 10.

  The molding die 22 as the lower die is fixed, and the molding die 21 as the upper die is reciprocated in the vertical direction. Thereby, the groove part 11 can be formed using the simple press machine driven up and down.

  As shown in FIGS. 6 and 7, the connecting terminal 10 in which the groove 11 is formed is subjected to pressure molding and electric heating by a pair of upper and lower molding dies 31 and 32 as a second molding die. For this reason, as shown in FIG. 6, the connection terminal 10 is arrange | positioned between the shaping | molding die 31 and 32 in the attitude | position state in which the groove part 11 becomes sideways. Thereafter, the pair of upper and lower forming dies 31 and 32 are gradually closed, and energization for heating is performed between the forming dies 31 and 32. When the connection terminals 10 stick to the molding dies 31 and 32 that also function as electrodes, for example, a coating (for example, tin plating) for preventing sticking can be applied to the outer surface of the connection terminals 10. .

  By energization heating, the enamel coating of the many enamel-coated conductors constituting the conductor bundle 3 is dissolved. Then, as shown in FIG. 6, the groove 11 is gradually crushed and deformed by pressurization by the molds 31 and 32. This crushing deformation is performed so that the inner wall surfaces adjacent to each other in the circumferential direction of the connection terminal 10 in the groove portion 11 are close to each other. Finally, the connection terminal 10 is formed into a cylindrical shape whose outer diameter is reduced as a whole (see FIG. 8). In addition, in FIG. 6, the molding surface (arc-shaped inner surface) of each shaping | molding die 31 and 32 is shown as 31a and 32a.

  The molding surfaces 31a and 32a of the respective molds 31 and 32 are formed as concave portions whose shape along the cross section is a semicircular arc shape. Then, the mold 31 as the upper mold is reciprocated in the vertical direction with respect to the mold 32 as the lower mold. Thereby, the connection terminal 10 can be molded (reduced diameter molding) using a simple press machine driven up and down.

  The melted enamel coating is discharged to the outside of the connection terminal 10 by pressurization by the molds 31 and 32. By discharging the enamel coating to the outside, the multiple conductors are electrically connected to each other and are also electrically connected to the connection terminal 10.

  Since the groove portion 11 is formed so that the cross section thereof has an arc shape, the conductor bundle 3 does not receive a large local force in the circumferential direction, and almost uniformly inward from the outer periphery thereof. You will receive a pressing force. That is, in a large number of enamel-coated conductors, the enamel coating is dissolved substantially evenly.

  The state connection terminal 10 after the molding is completed by the molding dies 31 and 32 is shown in FIG. FIG. 9A shows the connection terminal 10 before the groove 11 is formed (that is, before diameter reduction). 9B shows the connection terminal 10 after being reduced in diameter as shown in FIG. When the degree of diameter reduction of the connection terminal 10 is indicated by the shortened length in the circumferential direction, the shortened length is substantially equal to the length along the inner surface in the cross section of the groove 11.

  FIGS. 10 and 11 show a second embodiment of the present invention. The same components as those in the above-described embodiment are denoted by the same reference numerals, and redundant description thereof will be omitted. The same applies to other embodiments). In the present embodiment, the cross-sectional shape of the groove 12 (corresponding to the groove 11) is a substantially square shape. That is, the groove portion 12 has a bottom wall surface 12a and a pair of side wall surfaces 12b that are each linear.

  FIG. 11 shows molds 21 and 22 for forming the groove 12. The convex portion 21 c formed on the inner surface 21 a of the upper molding die 21 has a shape corresponding to the shape of the groove portion 12. In the present embodiment, in the cross section of the groove portion 12, the length along the inner surface (the total length of the bottom wall surface 12 a and the pair of side wall surfaces 12 b) can be secured sufficiently long. This is preferable for sufficiently reducing the diameter.

  FIG. 12 shows a third embodiment of the present invention. In the present embodiment, two groove portions 11 are formed in the connection terminal 10 at intervals of 180 degrees in the circumferential direction. The shape of the groove 11 is the same as that shown in FIG. And pressurization by the molds 31 and 32 is performed from the direction orthogonal to the direction connecting the two groove portions 11. In the present embodiment, it is preferable to press the conductor bundle 3 uniformly from the circumferential direction as much as possible while reducing the diameter of the connection terminal 10 more sufficiently.

  13 and 14 show a fourth embodiment of the present invention. In this embodiment, as shown in FIG. 13, the shape of the groove 12B is formed in a substantially wedge shape. The first molds 21 and 22 for forming the groove 12B are shown in FIG. 14, and the convex portions for forming the groove 12B are indicated by reference numeral 21d.

  FIG. 15 shows a fifth embodiment of the present invention. In the present embodiment, the end of the connection terminal 10 shown in FIG. 3 is processed to obtain a more preferable connection terminal 10B. That is, the connection terminal 10B is formed as an enlarged diameter portion 10a in which the inner diameter of each end portion is gradually increased toward the opening end surface.

  Since the connection terminal 10B has the enlarged diameter portion 10a, the conductor bundle 3 can be smoothly inserted into the connection terminal 10B, and the side surface of the conductor bundle 3 is prevented from being damaged by the connection terminal during the insertion. Is done. Since the enlarged diameter portion 10a is formed at both ends of the connection terminal 10B, it is not necessary to consider the orientation of the connection terminal 10B when inserting the conductor bundle 3 into the connection terminal 10B, and the workability is good. It will be a thing.

  By inserting the conductor bundle 3 from the enlarged diameter portion 10a side, the bending resistance of the conductor bundle 3 is improved in the connection completed state after the connection terminal 10B is reduced in diameter. That is, when the conductor bundle 3 is bent in the vicinity of the connection terminal 10B, a situation in which the conductor bundle 3 is strongly pressed at the inner end of the opening end of the connection terminal 10B is prevented. The enlarged diameter portion 10a may be formed only on one end side of the connection terminal 10B (in this case, the conductor bundle 3 is inserted into the connection terminal 10B from the enlarged diameter portion 10a side).

  The reduced connection terminal 10 (the same applies to 10B) can be directly connected to other devices. In particular, since it is cylindrical, the versatility of connection is high.

  FIG. 16 shows a sixth embodiment of the present invention. In the present embodiment, the connection terminal 10 (the same applies to 10B) corresponds to a case where the connection terminal 10 is connected to another device via another connection component 40. Another connecting component 40 is a fitting portion 41 that is fitted to the outer periphery of the connection terminal 10 and is integrally formed with the fitting portion 41 to have a shape (structure) suitable for connection with other devices. And a connecting portion 42.

  Another connection component 40 is electrically and mechanically coupled to the connection terminal 10 by caulking in a state where the fitting portion 41 is fitted to the outer periphery of the connection terminal 10. The state after crimping the fitting part 41 is shown by FIGS. FIG. 17 shows a case where the cross section of the fitting portion 41 is annular. FIG. 18 shows a case where the cross section of the fitting portion 41 is a square ring. FIG. 19 shows a case where the cross section of the fitting portion 41 is a regular hexagonal ring. Since the outer peripheral shape of the connection terminal 10 is circular, it is easy to correspond to various cross-sectional shapes of the fitting portion 41 (high versatility of connection).

  FIG. 20 shows a seventh embodiment of the present invention. In the present embodiment, as the connection terminal 10C (corresponding to the connection terminals 10 and 10B), one having a trumpet portion is used. That is, as illustrated in FIG. 20A, the connection terminal 10 </ b> C includes a cylindrical cylindrical portion 13 and a trumpet portion 14 that expands in a trumpet shape on one end side of the cylindrical portion 13. is there. By inserting the conductor bundle 3 from the wrapper portion 14 side, the operation of inserting the conductor bundle 3 into the connection terminal 10C becomes extremely easy, and the bending resistance of the conductor bundle 3 can be improved. FIG. 20B shows a state immediately after the conductor bundle 3 is inserted into the connection terminal 10C. In the subsequent processing, only the cylindrical portion 13 is formed with the grooves 11 (12) and reduced in diameter (fusing).

  Although the embodiment has been described above, the present invention is not limited to the embodiment, and can be appropriately changed within the scope described in the scope of claims. For example, the invention includes the following cases. . The shape of the groove portions (groove portions 11 and the like) can be selected as appropriate, for example, in a V shape, and three or more grooves can be formed at substantially equal intervals in the circumferential direction of the connection terminals. The cylindrical shape in the present invention includes a substantially cylindrical shape, and more specifically includes a case where the outer peripheral shape of the cross section is an ellipse or a regular polygon (for example, a regular decagon) close to a circle. The litz wire 1 may not have the outer coating layer 2 (the wire bundle 3 is not covered by the outer coating layer 2). The melting of the enamel coating can be performed by heating the second molding dies 31 and 32 themselves with, for example, a heater, instead of fusing that energizes and heats the connection terminals 10 via the second molding dies 31 and 32. In this case, it is preferable to heat the second molds 31 and 32 in advance to a temperature equal to or higher than the melting temperature of the enamel coating before performing pressure molding. When a plurality of groove portions (groove portions 11 and the like) are formed, convex portions for forming the groove portions can also be formed on the molding surface 22a (receiving surface) of the lower mold 22 in the first mold. Of course, the object of the present invention is not limited to what is explicitly stated, but also implicitly includes providing what is substantially preferred or expressed as an advantage.

  In the present invention, it is possible to stably connect a wire bundle composed of a large number of enamel-coated conductors to a connection terminal, and to form a highly versatile cylindrical shape as a connection terminal.

1: Litz wire (wiring)
2: Outer coating layer 3: Conductor bundle 10: Connection terminal 10a: Expanded diameter portion (FIG. 15)
11: Groove 10B: Connection terminal (FIG. 15)
12: Groove (FIG. 10)
12B: Groove (FIG. 13)
13: Cylindrical part (FIG. 20)
14: Trumpet (FIG. 20)
21: Mold (first mold, first upper mold)
21b: Convex part (corresponding to the groove part 11)
21c: Convex part (corresponding to the groove part 12)
21d: Convex part (corresponding to groove part 12B)
22: Mold (first mold, first lower mold)
22a: Molding surface (receiving surface)
31: Mold (second mold, second upper mold)
31a: Molding surface 32: Mold (second mold, second lower mold)
32a: Molding surface 40: Another connecting part (FIGS. 16 to 19)
41: Fitting part (FIGS. 16 to 19)
42: Connection part (FIG. 16)

Claims (13)

A first step of inserting a distal end portion of a bundle of conductive wires bundled with a large number of enamel-coated conductive wires into a connection terminal having a cylindrical shape at least at the distal end portion;
After the first step, the first molding die is used to press-mold a groove portion extending in the axial direction of the connection terminal and opened at the tip of the connection terminal in a part of the circumferential direction of the connection terminal. Steps,
After the second step, a third step of pressurizing and heating the connection terminal by a second mold to melt the enamel-coated conductive wire and discharge it to the outside of the connection terminal;
With
In the third step, the groove is deformed so as to be crushed in the circumferential direction of the connection terminal by pressurization by the second molding die, and at least the tip end side of the connection terminal is reduced in diameter. Molding is performed,
A connection method between a conducting wire and a connection terminal. In claim 1,
In the third step, fusing for flowing a heating current to the connection terminal is performed through the second molding die together with pressurization by the second molding die, and the connection between the conducting wire and the connection terminal is performed. Method. In claim 1 or claim 2,
The connection terminal used in the first step is a cylindrical shape having the same outer diameter over its entire length in the axial direction,
In the second step, the groove is formed so as to extend over the entire axial length of the connection terminal,
In the state after the third step, the outer peripheral shape of the connection terminal is a cylindrical shape having the same outer diameter over the entire axial length of the connection terminal.
A connection method between a conducting wire and a connection terminal. In any one of Claims 1 thru | or 3,
The connection terminal used in the first step is such that at least the inner diameter of one end thereof is gradually expanded toward the opening end surface,
In the first step, the wire bundle is performed from the one end side where the inner diameter of the connection terminal is expanded,
A connection method between a conducting wire and a connection terminal. In any one of Claims 1 thru | or 4,
In the second step, the groove is formed so that the shape along the cross section thereof is an arc shape. In any one of Claims 1 thru | or 5,
In the second step, only one groove is formed, and the method for connecting a conductive wire and a connection terminal. In any one of Claims 1 thru | or 5,
In the second step, a plurality of the groove portions are formed at substantially equal intervals in the circumferential direction of the connection terminal. In any one of Claims 1 thru | or 5,
In the second step, only one or two grooves are formed at intervals of approximately 180 degrees in the circumferential direction of the connection terminal,
In the third step, the connection terminal is pressurized from a direction substantially orthogonal to the indentation direction of the groove portion.
A connection method between a conducting wire and a connection terminal. In any one of Claims 1 thru | or 8,
After the third step, a fourth step of fitting a fitting portion of another connection component on the outer periphery of the connection terminal;
After the fourth step, a fifth step of fixing the fitting portion to the connection terminal by caulking,
The method for connecting the lead wire and the connection terminal, further comprising: In claim 1,
In the first step, the connection terminal to be used is formed into a shape in which a distal end portion is a cylindrical portion having a cylindrical shape and a base end portion is a trumpet shape extending in a trumpet shape, and the wire bundle is Inserted from the base end side of the connection terminal,
In the second step, the groove is formed in the cylindrical portion,
In the third step, pressure is applied to the cylindrical portion, and in a state after the third step, the cylindrical portion has a reduced diameter.
A connection method between a conducting wire and a connection terminal. In any one of Claims 1 thru | or 10,
The connection method used in the first step is characterized in that the connection terminal has a continuous shape over the entire length in the circumferential direction without having a cut in the circumferential direction. In any one of Claims 1 thru | or 11,
The first mold comprises a first lower mold and a first upper mold that is driven to reciprocate in the vertical direction,
In the first lower mold, a receiving surface for receiving the connection terminal is formed by forming a semicircular arc-shaped recess along the cross-section,
A convex portion having a shape corresponding to the groove portion is formed on the first upper mold.
A connection method between a conducting wire and a connection terminal. In any one of Claim 1 thru | or Claim 12,
The second mold comprises a second lower mold and a second upper mold that is driven to reciprocate in the vertical direction,
Each of the second lower mold and the second upper mold is formed with a molding surface having a semicircular arc-shaped recess along the cross section.
A connection method between a conducting wire and a connection terminal.

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