JP2999928B2 - How to fix the conductor to the terminal - Google Patents

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 locking a lead wire.

[0002]

2. Description of the Related Art A litz wire used for winding a coil of a transformer is a collection of many conductive wires having a large diameter. The locking portion becomes large, and when soldering, it is likely to come into contact with the litz wire locking portion of the adjacent terminal to cause a short circuit. For this reason, the terminals that lock the litz wire must be spaced apart from the terminals that lock the normal conductor, but this makes it difficult to reduce the size of the transformer.

In view of this, a terminal provided with a notch for press-fitting and fixing the terminal without winding a litz wire has been proposed, for example, in Japanese Utility Model Laid-Open No. 56-169526. Japanese Patent Application Laid-Open No. 4-334006 proposes a terminal in which a litz wire is inserted inside a cylinder and the cylinder is swaged from the outside. Either terminal can be used to lock the litz wire without winding it around the terminal.

[0004]

However, in the former case, when the litz wire is cut at the tip of the press-fit portion, the cut portion of the litz wire tends to be loosened. If this portion is separated, there is a problem that the solder spreads along the broken wires during soldering, and the soldered portion becomes large, so that there is a problem that the possibility of contact with an adjacent terminal increases.

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

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to easily and reliably lock a lead 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 is formed by engaging a conductive wire with a caulking portion formed on a terminal, and winding a fine wire around an outer periphery of a conductor end portion protruding from the caulking portion. The part and the conductor are fixed with solder.

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

[0009] The invention of claim 3 applies the invention of claim 1 or 2 to a litz wire.

[0010]

[0011]

[0012]

According to the first aspect of the present invention, the fine wire wound around the conductor promotes the fixation of the solder to the conductor, and enhances the fixation of the conductor to the terminal.

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

According to the third aspect of the present invention, the wound fine wire prevents the end of the litz wire from dispersing, and prevents the spread of the solder accompanying the dispersion.

[0015]

[0016]

[0017]

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

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

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

At the base end of the bifurcated member 4, a laterally projecting portion 8 is formed. Further, a notch 9 is formed above it.

A winding machine 10 shown in FIG. 3 is attached to a coil bobbin 5 having two such terminals 1 fixed to a flange 5A.
Performs winding by the litz wire 15 and fixes the litz wire 15 to each terminal 1 before and after the winding.

The winding machine 10 has a spindle that rotates while supporting the bobbin 5, and has two three-axis movable arms 11 and 12 on both sides thereof.

One arm 11 is provided with a nozzle 13 for supplying a litz wire. An arm 12 located on the opposite side of the coil bobbin 5 has a chuck 14 for gripping the end of the litz wire 15 and a cutter 1 for cutting the litz wire 15.
6. The crimping tool 17 for caulking the tip of the terminal 1 is attached.

To lock the litz wire 15 to the terminal 1, first, as shown in FIG. 4A, the coil bobbin 5 is supported at a rotational position where the terminal 1 faces upward, and as shown in FIG. The nozzle 13 is moved while the tip of the wire 15 is gripped by the chuck 14, and the litz wire 15 is caused to enter between the forked members 3 and 4 of the terminal 1 from above. Since the forked member 3 is longer than the forked member 4, the litz wire 1
If you move the nozzle 13 downward while pressing 5
The litz wire 15 is naturally guided between the guide surfaces 7, guided by the guide surface 7, and reaches the litz wire mounting portion 6.

In this state, using the cutter 16 in FIG.
The litz wire 15 is cut near the terminal 1 as shown in FIG. After the cutting, as shown in FIG. 4D, the forked members 3 and 4 of the terminal 1 are pressed inward from the outside using the caulking tool 17. Since the notch 9 is formed in the forked member 4 of the terminal 1, the forked member 4 is deformed by this caulking operation so that the tip is bent inward. Thereby, the litz wire mounting portion 6
Is reduced, and the litz wire 15 is fixed to the terminal 1.

Next, the nozzle 13 is moved so that the litz wire 15 passes under the protruding 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 via the groove 18 formed in the flange 5A in advance.

Then, as shown in FIG. 4 (e), the coil bobbin 5 is rotated to perform winding, and then the litz wire 15 is locked to the other terminal 1 provided on the flange 5A by moving the nozzle 13. . In this case, first, the litz wire 15 is guided to the right side in FIG. 4F through the lower side of the protruding portion 8, and after passing through the protruding portion 8 as shown in FIG. The terminal 1 is reversed and inserted between the forked 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 swaged with a caulking tool 17 to fix the litz wire 15 to the litz wire mounting portion 6.
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.

After the winding operation of the litz wire 15 is completed in this way, soldering to the terminal 1 is performed. Prior to the soldering, cutting of the litz wire 15 protruding from the litz wire mounting portion 6 is performed. A thin wire 2 as shown in FIG.
Wrap 0 around.

This thin wire 20 is formed of a conductive bare wire,
By winding the wire around the litz wire 15 several times, the wire has such a rigidity that the wire can be prevented from coming apart. The work of winding the fine wire 20 may be performed by replacing the nozzle 13 with another fine wire nozzle, or by preparing a special winding machine. Alternatively, manual work may be used.

After this operation, as shown in FIG. 5, the coil bobbin 5 is rotated half a turn to the position where the terminal 1 faces downward, and the terminal 1 is sunk into the solder bath 21, and the terminal 1 and the litz wire 15
Solder to the end of.

The tip of the litz wire 15 around which the fine wire 20 is wound is kept in a solid state without being separated, so that the solder adheres only to a necessary portion and the soldered portion does not bulge largely. . Therefore, terminal 1
Even when the solder does not protrude around and the space between the adjacent terminals 1 is small, a sufficient clearance between both soldered portions can be reduced.

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

Here, a terminal 25 having a different shape is used in place of the terminal 1. The fixing portion 26 at the base end of the terminal 25 is configured in the same manner as the base end 2 of the terminal 1, but the bifurcated member 3
A gutter-like guide 28 having a substantially semicircular cross section is formed in place of and. Further, at the base end of the guide 28, as shown in FIG. 7, a protruding portion 29 protruding above the groove 18 of the flange 5A is formed. A clearance larger than the diameter of the litz wire 15 is set between the protrusion 29 and the flange 5A.

When the winding work is performed on the coil bobbin using the terminals 25, unlike the first embodiment, the chuck 14 is arranged above and the nozzle 13 is arranged below and the litz wire 15 is The wire is guided inward, and the thin wire 20 is wound at this stage. The litz wire 15 is cut by the cutter 16 immediately above the terminal 20, and is passed under the protrusion 29 to guide the litz wire to the winding portion of the coil bobbin 5.

At the end of winding of the litz wire 15 around the coil bobbin, the nozzle 13 is moved upward after passing under the protrusion 29 to guide the litz wire 15 inside the guide 28, and Fine wire 2 integrated with litz wire 15
After winding 0, the litz wire 15 is cut just above the guide 28 by the cutter 16.

In this case, the locking of the litz wire 15 and the winding of the thin wire for preventing the looseness can be performed by the same operation. Furthermore, since the litz wire 15 and the guide 28 are parallel and the cross section of the litz wire locking portion is small, the interval between the terminals 1 can be reduced.

In each of the above embodiments, the terminal 1
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).
, The terminal 1 (15) can be pressed into the flange 5A.

Further, the present invention can be applied not only to the litz wire but also to a normal conductor. There is no danger that the tip of a conductor such as a litz wire that is not an aggregate of strands will be separated, but by winding the fine wire 20 around the tip of the conductor, solder fixation is promoted and the fixation to the terminal can be strengthened. .

[0039]

As described above, according to the first aspect of the present invention, the fine wire is wound around the tip of the conductive wire protruding from the caulked portion prior to soldering, so that the fixation of the solder to the conductive wire is promoted, and Fixing to the terminal is strengthened.

According to the second aspect of the present invention, since the conductor is directly wound around the terminal with a thin wire and soldered, the fixing of the conductor 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 thin wire prevents the end portion of the litz wire from dispersing and the spread of the solder accompanying the dispersal, so that the soldering range can be minimized. For this reason, the distance between the terminals for fixing the litz wire can be shortened, and downsizing of a device using the litz wire, such as a coil bobbin for a transformer, becomes possible.

[0042]

[0043]

[Brief description of the drawings]

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

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

FIG. 3 is a perspective view of a main part of a winding machine for locking a litz wire to a terminal.

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

FIG. 5 is a vertical sectional view of a solder tank showing a soldering operation.

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

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

[Explanation of symbols]

 DESCRIPTION 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

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01F 41/10 H01R 4/02

Claims (3)

(57) [Claims] A crimping portion formed on a terminal is engaged with a conductive wire to form a crimping portion, and a thin wire is wound around an end of the conductor protruding from the crimping portion. Characteristic method of fixing conductors to terminals. 2. A method for fixing a conductive wire to a terminal, comprising: directly winding the end of the conductive wire led to the terminal with a thin wire around the terminal, and then soldering the wound portion. 3. The wire according to claim 1, wherein the conductor is a litz wire.
3. The method for fixing a lead wire to a terminal according to 1.