JPH0370107A - Common mode choke coil and manufacture thereof - Google Patents

Abstract

PURPOSE:To eliminate imbalance between two windings and omit temporary fixing of the end of the winding and economically manufacture a common mode choke coil with improved quality to be mounted on a longitudinal substrate by winding two windings simultaneously on a united body obtained through combining four members, i.e., a double-squared a core, cylindrical spool and a pair of terminal base segments, using a winding machine and coiling the end of the wound lead around a pin terminal. CONSTITUTION:A driving gear is caused to mesh with a gear 75 from underside of a united body consisting of four members, i.e., a core 1, a spool 2 and terminal base segments 3, 4. The spool 2 is rotated by the driving gear to wind two windings simultaneously between a central collar 7 and an end collar 8. During this winding operation, an arcuate projection 34 ensures the mesh between the gear 73 and the driving gear by being in sliding contact with the outer periphery of the central collar 7 and at the same time it serves to press a lead wire at the beginning of the winding thereof into a receiving groove 71. The ends of the wound leads are coiled around the two pin terminals 5 on a terminal base segmentss 3 simultaneously. This coiling process is terminated when a wire material nozzle 10 which finished winding moves to the vicinity of the extremity of the pin terminal 5 passing through a longitudinal groove 31 in the terminal 5 side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a board-mounted common mode choke coil used to remove noise from a power supply line, and a method for manufacturing the same.

[Prior Art] Common mode choke coils (hereinafter simply referred to as coils) for noise filters include those that use a closed magnetic circuit ferrite core and those that use a split closed magnetic circuit ferrite core. A Japanese-shaped core is used as the closed magnetic circuit core, and the core is vertically placed.
As a conventional technology for a board-mounted coil in which the central magnetic leg is arranged horizontally (referred to as a vertical type or simply a vertical type), for example, as shown in Japanese Patent Application Laid-Open No. 62-291108, two coils are used. A two-part cylindrical winding frame with a plurality of circular flanges and a plurality of winding parts is assembled to the central magnetic leg of the core. Rotate the cylindrical reel around 2
The coil body is made by winding several windings separately or simultaneously. Bin terminals are vertically placed on the bottom from both sides of the vertical coil body, and insulating plates for opening the core and windings are protruded to the sides. There is a structure in which a pair of frame-shaped terminal plates are assembled so that the cylindrical winding frame does not rotate, and the lead wires of the windings are connected to the pin terminals.

[Problem 8 to be solved by the invention] A conventional vertical board-mounted coil using a Japanese-shaped core and a cylindrical winding frame has a structure in which a pair of terminal plates are assembled to a coil body around which a winding is wound. In order to prevent the winding from unraveling, it was necessary to temporarily secure the end of the winding, such as applying adhesive or pasting insulating tape.

The conventional pair of terminal plates has a structure that prevents the cylindrical winding frame from rotating, so by combining the core, the cylindrical winding frame, and the pair of terminal plates, two windings can be simultaneously attached to the cylindrical winding frame. I couldn't turn it around.

Therefore, an object of the present invention is to create a wire winding machine equipped with a wire rod nozzle and a cut holder to combine a Japanese-shaped core, a cylindrical winding frame, and a pair of bent terminal block pieces.
To obtain a structure and manufacturing method of a coil capable of simultaneously winding several windings and twisting a lead wire at the end of the winding to a pin terminal.

[Means for Solving the Problems] The present invention provides a Japanese character-shaped ferrite core, a two-part cylindrical winding frame assembled to the central magnetic leg of the core and provided with an end flange and a center piece, the core and the above-mentioned The terminal block includes a pair of terminal block pieces assembled on a winding frame and having a frame shape with two pin terminals vertically disposed on the bottom surface, and two windings attached to the end of the winding, and the above-mentioned The cylindrical winding frame has a lead wire storage groove and a gear formed in the central piece, a notch formed in the wall of the storage groove, a lead wire storage groove formed in the end flange on the side of the gear, and a lead wire storage groove formed in the end flange on the side of the gear. A notch is formed in the groove wall, and one terminal block piece of the above terminal block has a plurality of vertical grooves formed on one side leading to the inner periphery, and the other side has a plurality of vertical grooves connected to the upper and lower sides of the inner periphery. Insulating partition plates between the windings and the core are provided that extend horizontally from the edge, and arc-shaped protrusions are provided on the upper and lower walls of the inner periphery. This common mode choke coil is characterized in that fitting step portions that fit with the partition plates are formed on each side.

The present invention also provides a step of assembling the pair of terminal block pieces to the core and the cylindrical winding frame integrally assembled;
A driving gear is meshed with the gear of the cylindrical winding frame.
2. A common mode choke coil according to claim 1, comprising the steps of simultaneously winding two windings around said cylindrical winding frame, and connecting a lead wire at the end of said winding to said pin terminal of said terminal block. This is the manufacturing method.

[Embodiment] FIG. 1 is an external view of an embodiment of a coil according to the present invention (windings are not shown). In the figure, 1 is a Japanese letter-shaped ferrite core, 2 is a two-part cylindrical winding frame, 3 and 4 are terminal block pieces, and 5 is a pin terminal.

The core 1, as shown with the disassembled winding frame 2 in FIG.
The cross-sectional shape of the central magnetic leg 11 is a square shape with the four corners rounded off.

The winding frame 2 consists of two semi-cylindrical winding frame division pieces 6. The winding frame divided piece 6 is a half-cylindrical winding core 61, and two pieces, a center piece 7, an end collar 8, and an intermediate partition collar 62 are integrally provided on the outer periphery of a semi-cylindrical winding core 61. The inner diameter dimension of the winding core 61 is a dimension that almost circumscribes the central magnetic leg 11 of the core 1, and the outer diameter dimension of the collars 7, 8.62 is a dimension that almost circumscribes the central magnetic leg 11 of the core 1.
The dimension is slightly smaller than the spacing between the outer magnetic legs 12 of.

Engagement protrusions 6 extending in the tangential direction are provided on both opening edges of the winding core 61.
3 are provided, and an engagement step portion 64 and an engagement groove 65 are also formed.

The central portion 7 has a thickness that ensures a spatial insulation distance (for example, 3.5 mm) between the windings, and has notches at uneven positions in the winding start lead wire storage groove 71 and the thinner side wall of the storage groove 71. A notch 72 is formed toward the end surface of the central portion 7, and one (outside) corner of the notch 72 is an acute angle. The thicker side of the storage groove 71 (
A gear 73 is carved on the outer periphery of the side wall (right side in the figure).

The gear 73 is a triangular-toothed gear with a tip angle of 60°, which allows the winding frame segment 6 to be manufactured by injection molding. An engaging cylinder 74, an engaging hole 75, etc. are provided on the end surface of the central portion 7.

A winding start lead wire storage groove 81 is formed on the outer periphery of one end portion 8 (on the gear 73 side, right side in the figure), and a notch 82 (see FIG. 3) similar to the notch 72 in the center portion 7 is formed. is formed.

The partition flange 62 has a central portion cut off in a fan shape to form a transition portion for the windings.

The terminal block pieces 3 and 4 are in the shape of a vertically long rectangular frame made of insulating material, and as shown in FIG. Magnetic leg 11 with core length 1
．． 12, and the thickness dimension is approximately the same as the height (radial direction) dimension of the collars 7 and 8.

The terminal block piece 3 has two vertical grooves 31 on one side that communicate with the inner circumference.
are formed (2 locations on the top and bottom sides, 4 locations in total). The distance between the centers of the vertical grooves 31 is the same as the distance between the centers of the storage groove 71 in the center portion 7 and the storage groove 81 in the end portion 8. The width dimension of the vertical groove 31 is sufficiently larger than the outer diameter of the winding nozzle of the winding machine. The depth of the vertical groove 31 is such that the groove bottom has a notch 72 (
The dimension is approximately at the same level as the lowest point of the outer side edge of 82) (see FIG. 3, level indicated by depth D).

The other surface of the terminal block piece 3 is provided with an insulating partition plate 32 and a core holding plate 33 extending horizontally from the upper and lower inner peripheral edges and the bottom edge. The insulating partition plates 32 face the inner peripheral sides of the outer magnetic legs 12 of the core 1 and insulate between the windings and the core, and their length (extending direction) is sufficiently larger than the thickness of the core 1. It is. The length of the core holding plate 33 is
The dimension is approximately half the thickness of the core 1.

Arc-shaped protrusions 34 (one is shown) are provided at the center of the upper and lower inner peripheral walls (peripheral walls provided with insulating partition plates) of the terminal block piece 3, respectively. The arcuate protrusion 34 slides on the outer periphery of the central portion 7 of the winding frame 2, which is freely rotatable (centered around the central magnetic leg 11) and loosely inserted into the inner periphery from the insulating partition plate 32 side.

The terminal block piece 4 is provided with a core holding plate 41 extending horizontally from the bottom edge on one side, and has fitting step portions 42 (only the lower part shown) formed on the upper and lower walls of the inner periphery, respectively. Core holding plate 41
has a length (extending direction) that is approximately half the thickness of the core 1, and has an extending end surface corresponding to a locking hole (not shown) formed in the core holding plate 33 of the terminal block piece 3. engaging protrusion 43
(Two rectangular pieces in the figure) are provided. Note that the vertical groove 45
is a groove that guides the lead wire at the beginning of winding to the pin terminal 5.

Two standoff pieces 35.44 (one is shown at 44) are provided on the bottom of each terminal block piece 3.4.

A coil can be made using the winding frame segment 6 and the terminal block piece 3.4 having such a configuration in accordance with the procedure described below.

The winding machine used has a wire nozzle and a cut holder. The wire nozzle is placed in the storage groove 71.81 of the winding frame 2.
It is a set of two downward-facing rods arranged at the same distance between the centers of the , and is moved three-dimensionally by NC control. The cut holder has a structure in which, for example, three L-shaped members are stacked with their short arms facing upward and their bodies horizontally so that they can slide freely in the length direction of the bodies. It can hold the starting end or tear off thin wire, and it can move in two horizontal directions or revolve in one direction.

First, the two winding frame divided pieces 6 are attached to their retaining members (the engaging protrusion 63, the engaging stepped portion 64, the engaging groove 65, the engaging cylinder 74, etc.).
are assembled to the central magnetic leg 11 of the core 1 by engaging with each other.

This three-part combination product of the COAT winding frame 2 is arranged so that the core 1 is vertical and the end flange 8 where the storage groove 81 is located is on the right side, and the terminal block piece 3° 4 is oriented as shown in FIG. Place it between. The insulating partition plate 32 of the terminal block piece 3 is inserted between the outer magnetic leg 12 of the core 1 and the winding frame 2, and the fitting step 42 of the terminal block piece 4 is inserted, and the engaging protrusion 43 is inserted into the locking hole. 2.
Make a combined product of terminal block piece 3.4.

The winding operation of the wire by the above-mentioned winding machine will be explained next.

As shown in Figure 5 (terminal block piece 4 is indicated by a chain line), lay the terminal block piece 3 on its side and place it on the outside edge of the notch 72, 82 (with an acute angle). using a jig (not shown) of the winding machine so that the side edges) are vertically oriented and are on the side of the cut holder 9 (see Figure 6) (so that the pin terminal 5 is on the opposite side of the cut holder). Hold. A drive gear (not shown) is meshed with the gear 73 from below the combined rotor.

The cut holder 9 is located at a position away from the combined product by sandwiching the starting ends of the two wire rods, and has a wire nozzle 10 (two zero
Indicated by a mark. (See Fig. 6) is the combination product and cut holder 9.
It is in the middle position.

The beginning of the roll is performed in the following order.

B. The wire nozzle 10 moves, passes through the vertical groove 31 without the pin terminal 5, moves along the inner circumference to the storage groove 71.81, and further passes through the storage groove 71.81 and the notch 72.82. Then return slightly to the cut holder 9 side and make a notch 7 in the wire.
2. Hang it on the outside edge of 82 (see Figure 6).

(b) Due to approximately 174 rotations of the gear 73 in the direction of the arrow (by the drive gear), the advancement of the cut holder 9 (approaching the combined product), and the movement of the wire rod nozzle 10 to almost directly above the winding core 61. Insert the wire into the storage groove 71°81 (7th
(see figure).

C. Cut the wire with a cutter, for example, at the locations indicated by the x marks in FIG. The cutting point is usually a point where the length from the notch 72.82 is shorter than the circumference of the storage groove 71.81, and after winding work, it is pulled out from the storage groove 71.81 and tied to the required pin terminal. This is a point that is long enough to be connected.

The winding frame 2 is rotated by the drive gear (in the direction of the arrow in FIG. 6) to simultaneously wind two windings between the center flange 7 and the end flange 8. During this winding, the arcuate protrusion 34 comes into sliding contact with the outer periphery of the center flange 7 to ensure engagement between the gear 73 and the driving gear, and also functions to push the winding start lead wire (wire rod) into the storage groove 71.

The end-of-winding lead wire (wire rod) is simultaneously tied to the two pin terminals 5 of the terminal block piece 3. In this winding process, the wire nozzle 10 that has finished winding passes through the vertical groove 31 on the pin terminal 5 side and moves to the vicinity of the tip of the pin terminal 5 (here, the interval between the pin terminals 5 is slightly smaller than the nozzle interval). (because it's so big) finish by doing a slightly thicker karage exercise.

Immediately after cutting the wire, the cut holder 9 returns to its original position (see FIG. 6) and its arms are open.

The wire rod nozzle 10 that has completed the tying process moves to the cut holder 9 side and passes between its arms.

The cut holder 9 is forcefully closed to hold the wire rod.

Cut the wire at the base of the pin terminal 5 with a cutter.

The wire rod nozzle 10 returns to the starting position and prepares for a new wire assembly.

The winding start lead wire is manually pulled out from the storage groove, tied around and connected to the pin terminal 5 of the terminal block piece 4, and the coil is completed.

[Effects of the Invention] As explained above, according to the present invention, the core, bobbin,
A commercially available automatic winding machine can be used by simply adding a drive gear to the combined product of terminal block pieces, winding both windings at the same time, and then wrapping the end of the winding lead wire around the bin terminal. Therefore, there is no imbalance between the two windings, and temporary fixing at the end of the winding can be omitted, so that a high-quality vertical board-mounted common mode choke coil can be manufactured at low cost.

[Brief explanation of drawings]

Fig. 1 is an external view showing the coil according to the present invention without the winding, Fig. 2 is an exploded view showing the core and winding frame used in the invention, and Fig. 3 is taken along line A-A in Fig. 2. A sectional view of a winding frame divided piece, FIG. 4 is an external view showing an example of a terminal block piece used in the present invention, and FIG. 5 is a combined product of the core, winding frame, and terminal block piece during the winding process. FIGS. 6 and 7 are plan views for explaining the beginning of winding. 1... Japanese letter-shaped ferrite core, 11... Central magnetic pole,
2... Cylindrical winding frame, 3, 4... Terminal block piece, 31...
Vertical groove, 32... Insulating partition plate, 33.41... Core holding plate, 34... Arc-shaped projection, 42... Fitting step portion, 5
... Bin terminal, 6 ... Winding frame division piece, 7 ... Center flange, 71.81 ... Winding start lead wire storage groove, 72.82
... Notch, 73 ... Gear, 9 ... Cut holder, 10 ... Wire rod nozzle. Figure 2

Claims (2)

[Claims] 1. a Japanese letter-shaped ferrite core; a two-part cylindrical winding frame assembled to the central magnetic leg of the core and having an end flange and a center flange; The cylindrical winding frame has a lead wire storage groove and A gear is formed, a notch is formed in the storage groove wall, a lead wire storage groove is formed in the end flange on the gear side, and a notch is further formed in the storage groove wall. , One terminal block piece of the above terminal block has a plurality of vertical grooves formed on one side leading to the inner periphery, and the other side has insulation partitions between the windings and the core extending horizontally from the upper and lower edges of the inner periphery. Each of the terminal block pieces is provided with arcuate projections on the upper and lower walls of the inner periphery, and the other terminal block piece has a fitting stepped portion on the upper and lower sides of the inner periphery of one side that fits with the partition plate. A common mode choke coil characterized in that each of the following is formed. 2. a step of assembling the pair of terminal block pieces to the core and the cylindrical winding frame integrally assembled; and a step of engaging the drive gear with the gear of the cylindrical winding frame to simultaneously connect the two windings to the cylindrical winding frame. 2. The method of manufacturing a common mode choke coil according to claim 1, further comprising the steps of: winding the coil around the coil; and connecting the lead wire at the end of the winding to the pin terminal of the terminal block.