JPH0851043A - Conductor fixing terminal and fixing method - Google Patents

Abstract

PURPOSE:To stop a conductor, e.g. a litz wire, easily and surely to a terminal without requiring a large space by bonding the conductor to a caulking part formed in the terminal and caulking the conductor thereat, winding a thin wire about the end part of the conductor projected from the caulked part, and then soldering the caulked part and the conductor. CONSTITUTION:When a litz wire 15 is inserted between the forked members 3, 4 of a terminal 1 from above while gripping the forward end part thereof by means of a chuck, the litz wire 15 is guided along a guide face 7 to a litz wire mounting part. The litz wire 15 is then cut off in the vicinity of the terminal 1 and the forked members 3, 4 are caulked from the outside thus securing the litz wire to the terminal 1. A thin wire 20 is then wound around the end part of the litz wire 15 projecting from the mounting part prior to soldering. Subsequently, the terminal 1 is sunk into a solder bath 21 thus soldering the terminal 1 and the end parts of the litz wire 15. Since the thin wire 20 wound around the forward end part of the litz wire 15 prevents the litz wire 15 from being unstranded, the soldered part is prevented from inflating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for fixing a lead wire such as a litz wire to a terminal of a coil such as a transformer, and an improvement in a terminal for holding the lead wire.

[0002]

2. Description of the Related Art A litz wire used for winding a coil of a transformer is an assembly of many highly conductive wires, and since the whole diameter is large, it can be simply wound around a terminal of a coil bobbin and locked. The locking part becomes large, and when soldering, it easily contacts the litz wire locking part of the adjacent terminal and short-circuits. Therefore, the terminals for locking the litz wire have to be spaced apart from each other as compared with the terminals for locking the ordinary conducting wire, which makes it difficult to downsize the transformer.

Therefore, a terminal provided with a notch that can be press-fitted and fixed without winding the litz wire around the terminal has been proposed, for example, in Japanese Utility Model Laid-Open No. 56-169526. Further, JP-A-4-334006 proposes a terminal in which a litz wire is inserted into the inside of the cylinder to crimp the cylinder from the outside. With either terminal, the litz wire can be locked without being wound around the terminal.

[0004]

However, in the former case, when the litz wire is cut at the tip of the press-fitting part, the cut part of the litz wire tends to come apart. If this part is separated, there is a problem that the solder spreads along the separated wires during soldering, and the soldered part becomes large, which increases the risk of contacting the adjacent terminals.

In the latter case, since the tip of the litz wire is inserted inside the cylinder, it is difficult to align the inlet of the cylinder with the tip of the litz wire, and the tip of the litz wire is slightly dislocated. There was a problem that it could not be inserted properly.

The present invention has been made to solve the above problems, and an object of the present invention is to easily and reliably lock a conducting wire such as a litz wire to a terminal without requiring a space.

[0007]

According to a first aspect of the present invention, a caulking portion formed on a terminal is caulked with a conductor wire and caulked, and a thin wire is wound around the outer periphery of the conductor wire end protruding from the caulking portion, and then the caulking is performed. The part and the conductor are fixed with solder.

According to the second aspect of the present invention, after the end portion of the lead wire guided to the terminal is wound directly around the terminal with a fine wire, the winding portion is soldered.

The invention of claim 3 applies the invention of claim 1 or 2 to a litz wire.

According to a fourth aspect of the present invention, a fixing portion embedded in the supporting member is provided at the base end, the distal end is bifurcated to form a lead wire mounting portion between the bifurcated members, and one of the bifurcated members is provided. Is formed longer than the other.

According to a fifth aspect of the present invention, a fixing portion embedded in the supporting member is provided at the base end, and a gutter-shaped conductor mounting portion having a substantially semicircular cross section is provided at the tip end.

[0012]

According to the first aspect of the present invention, the thin wire wound around the conductive wire promotes the fixing of the solder to the conductive wire and strengthens the fixing of the conductive wire to the terminal.

According to the second aspect of the present invention, the conductor wire directly wound around the conductor wire and the terminal promotes fixing of the solder,
Strengthen the fixing of the conductor to the terminal.

According to the third aspect of the invention, the wound thin wire prevents the litz wire from being dislocated at the end and the solder from spreading due to the dislocation.

According to the invention of claim 4, the conductor wire can be easily locked to the terminal by caulking the bifurcated member while sandwiching the conductor wire in the mounting portion. In addition, the bifurcated member, one of which is formed long, facilitates the guiding of the conductive wire to the mounting portion.

According to the fifth aspect of the invention, the cross section of the fixed portion of the conductive wire can be made small by inserting the end portion of the conductive wire into the trough-shaped mounting portion and winding the thin wire.

[0017]

1 to 5 show a first embodiment of the present invention.

FIG. 1 shows the shape of a terminal for fixing the litz wire. The terminal 1 has a fixed portion 2 formed at the base end and is provided with bifurcated members 3 and 4 branched at the tip. As shown in FIGS. 2 and 3, the terminal 1 is fixed with the fixing portion 2 embedded in the flange 5A of the coil bobbin 5 as a supporting member.

The bifurcated member 3 is formed to be slightly longer than the bifurcated member 4. A litz wire mounting portion 6 as a caulked portion is formed between the bifurcated members 3 and 4. The litz wire mounting portion 6 is a substantially circular notch located at the base end of the fork. From the tips of the bifurcated members 3 and 4 to the litz wire mounting portion 6, the litz wire 15 shown in FIG.
A guide surface 7 is formed on the opposite side surfaces of the bifurcated members 3 and 4 in order to guide the guide wire 7 from the tip toward the litz wire mounting portion 6.

A lateral projection 8 is formed at the base end of the bifurcated member 4. Further, a notch 9 is formed above it.

For the coil bobbin 5 in which two such terminals 1 are fixed to the flange 5A, the winding machine 10 shown in FIG.
Winding the litz wire 15 and fixing the litz wire 15 to each terminal 1 before and after the winding.

The winding machine 10 is provided with a spindle that supports and rotates the bobbin 5, and is provided with two triaxial movable arms 11 and 12 on both sides thereof.

A nozzle 13 for supplying a litz wire is provided on one arm 11. A chuck 14 that holds the tip of the litz wire 15 and a cutter 1 that cuts the litz wire 15 are provided on the arm 12 located on the opposite side of the coil bobbin 5.
6. A crimping tool 17 for crimping the tip of the terminal 1 is attached.

To lock the litz wire 15 to the terminal 1, first, as shown in FIG. 4 (a), the coil bobbin 5 is supported at a rotational position in which the terminal 1 faces upward, and as shown in FIG. With the tip of the wire 15 held by the chuck 14, the nozzle 13 is moved so that the litz wire 15 is inserted between the bifurcated members 3 and 4 of the terminal 1 from above. Since the bifurcated member 3 is longer than the bifurcated member 4, the litz wire 1 is attached to the side surface near the tip of the bifurcated member 3.
If you move the nozzle 13 downward while pressing 5,
The litz wire 15 is naturally guided between the guide surfaces 7 and guided by the guide surfaces 7 to reach the litz wire mounting portion 6.

In this state, the cutter 16 is used to
As shown in (c), the litz wire 15 is cut near the terminal 1. After cutting, the bifurcated members 3 and 4 of the terminal 1 are pressed inward from the outside by using a caulking tool 17 as shown in FIG. Since the notch 9 is formed in the bifurcated member 4 of the terminal 1, the caulking operation causes the bifurcated member 4 to be deformed so that its tip is bent inward. As a result, the litz wire mounting portion 6
Becomes narrower and the litz wire 15 is fixed to the terminal 1.

Next, the nozzle 13 is moved to pass the litz wire 15 through the lower side of the projecting portion 8 of the terminal 1, and as shown in FIG.
After changing the direction by 80 degrees, it is guided to the winding position of the coil bobbin 5 through the groove 18 formed in the flange 5A in advance.

Then, as shown in FIG. 4 (e), the coil bobbin 5 is rotated to carry out winding, and then the litz wire 15 is locked to the other terminal 1 provided on the flange 5A by the movement of the nozzle 13. . In this case, first, the litz wire 15 is guided to the right side of FIG. 4 (f) through the lower side of the protrusion 8, and after passing through the protrusion 8 as shown in FIG. Reversed and inserted between the bifurcated members 3 and 4 of the terminal 1. When the litz wire 15 reaches the litz wire mounting portion 6, as shown in FIG. 4 (h), the bifurcated member 4 is caulked by the caulking tool 17 to fix the litz wire 15 to the litz wire mounting portion 6, and
As shown in (i), the litz wire 15 is gripped by the chuck 14, and the litz wire 15 is cut by the cutter 16 near the terminal 1.

In this way, after finishing the winding work of the litz wire 15, the terminal 1 is soldered. Before the soldering, the litz wire 15 protruding from the litz wire mounting portion 6 is cut. As shown in Fig. 2, the thin wire 2
Wrap 0 around.

The thin wire 20 is made of a conductive bare wire,
The litz wire 15 has sufficient rigidity to prevent the strands from being separated by winding the litz wire 15 several times. The winding operation of the thin wire 20 may be performed by replacing the nozzle 13 with another thin wire nozzle, or by preparing a dedicated winding machine. Alternatively, manual work may be performed.

After this work, as shown in FIG. 5, the coil bobbin 5 is half-turned to a position where the terminal 1 faces downward, and the terminal 1 is submerged in the solder bath 21, and the terminal 1 and the litz wire 15
Solder to the end of.

Since the tip of the litz wire 15 around which the thin wire 20 is wound is not loosened and is held in a cohesive state, the solder adheres only to the necessary parts and the soldered part does not bulge greatly. . Therefore, terminal 1
Even if the solder does not bulge around and the distance between the adjacent terminals 1 is narrow, a sufficient clearance can be made small between both soldered portions.

FIGS. 6 and 7 show a second embodiment of the present invention.

Here, instead of the terminal 1, a terminal 25 having a different shape is used. The fixed portion 26 at the base end of the terminal 25 has the same structure as that of the base end 2 of the terminal 1, but the forked member 3 is provided at the tip.
Instead of 4 and 4, a gutter-shaped guide 28 having a substantially semicircular cross section is formed. Further, as shown in FIG. 7, a protruding portion 29 that protrudes above the groove 18 of the flange 5A is formed at the base end of the guide 28. A clearance larger than the diameter of the litz wire 15 is set between the protrusion 29 and the flange 5A.

When the coil bobbin is wound using the terminal 25, unlike the first embodiment, the chuck 14 is arranged above and the nozzle 13 is arranged below so that the litz wire 15 can be connected to the guide 28. The wire 20 is guided to the inside, and the thin wire 20 is wound at this stage. The litz wire 15 is cut by a cutter 16 just above the terminal 20 and passed under the protruding portion 29 to guide the litz wire to the winding portion of the coil bobbin 5.

At the end of winding the litz wire 15 around the coil bobbin, the litz wire 15 is guided upward into the guide 28 by moving the nozzle 13 upward after passing under the protrusion 29. Fine wire 2 integrated with litz wire 15
After winding 0, the litz wire 15 is cut by the cutter 16 immediately above the guide 28.

In this case, the locking of the litz wire 15 and the winding of the thin wire for preventing the loosening can be performed in the same operation. Further, since the litz wire 15 and the guide 28 are parallel to each other and the cross section of the litz wire locking portion is small, the interval between the terminals 1 can be narrowed.

In each of the above embodiments, the terminal 1 is used.
The case where (25) is fixed to the flange 5A in advance has been described, but the litz wire 15 is connected to the terminal 1 (25).
It is also possible to press-fit the terminal 1 (15) into the flange 5A after fixing to the flange 5A.

Further, the present invention can be applied not only to the litz wire but also to ordinary conductor wires. There is no fear that the tip of a conducting wire that is not an assembly of strands such as a litz wire will come apart, but by winding the thin wire 20 around the leading end of the conducting wire, the fixing of solder can be promoted and the fixing to the terminal can be strengthened. .

[0039]

As described above, according to the first aspect of the invention, since the fine wire is wound around the tip of the conductive wire protruding from the crimped portion prior to soldering, the fixing of the solder to the conductive wire is promoted and the conductive wire The fixation to the terminal is strengthened.

According to the second aspect of the present invention, since the conductor wire is directly wound around the terminal with a thin wire and soldered, the fixing of the conductor wire to the terminal is strengthened and the cross section of the fixing portion can be reduced.

According to the third aspect of the present invention, the fine wire prevents the end portion of the litz wire from spreading and the solder from spreading due to the spreading, so that the soldering range can be minimized. Therefore, the distance between the terminals that fix the litz wire can be shortened, and the size of equipment such as a transformer coil bobbin that uses the litz wire can be reduced.

According to the fourth aspect of the invention, since the bifurcated member having one elongated side is used, it is easy to guide and lock the conducting wire to the mounting portion.

According to the fifth aspect of the present invention, since the leading end is provided with the conducting wire mounting portion having a substantially semicircular cross section, the cross section of the fixed portion of the conducting wire can be reduced. Therefore, the distance between the terminals can be reduced, which has a preferable effect in reducing the size of the coil bobbin.

[Brief description of drawings]

FIG. 1 is a front view of a terminal showing a first embodiment of the present invention.

FIG. 2 is likewise a perspective view of a terminal fixed to a flange.

FIG. 3 is likewise a perspective view of a main part of a winding machine that locks a litz wire to a terminal.

FIG. 4 is likewise an explanatory view for sequentially explaining a locking operation to a terminal.

FIG. 5 is a vertical sectional view of the solder bath showing the soldering work.

FIG. 6 is a perspective view of a terminal showing a second embodiment of the present invention.

FIG. 7 is likewise a perspective view of a terminal fixed to a flange.

[Explanation of symbols]

 1 Terminal 2 Fixed Part 3, 4 Bifurcated Member 5 Coil Bobbin 5A Flange 6 Litz Wire Mounting Part 15 Litz Wire 20 Fine Wire 28 Guide

Claims (5)

[Claims] 1. A caulking part formed on a terminal is caulked by caulking, and a thin wire is wound around the outer circumference of the caulking part protruding from the caulking part, and then the caulking part and the conducting wire are fixed with solder. How to fix the characteristic conductor to the terminal. 2. A method of fixing a conductor wire to a terminal, which comprises winding the end portion of the conductor wire led to the terminal directly on the terminal with a thin wire, and then soldering the wound portion. 3. The litz wire as the conductor wire according to claim 1 or 2.
Method of fixing the conductor wire to the terminal described in. 4. A fixing portion embedded in a supporting member is provided at a base end, a distal end is bifurcated to form a lead wire mounting portion between the bifurcated members, and one of the bifurcated members is longer than the other. A terminal for fixing a conductor, which is formed. 5. A conductor wire fixing terminal comprising a fixing portion embedded in a supporting member at a base end thereof, and a gutter-shaped conductor attaching portion having a substantially semicircular cross section at a tip end thereof.