JP5099430B2 - Coil parts - Google Patents

Description

  The present invention relates to a coil component.

  The coil component includes a core, a winding wound around the core, and a terminal fitting that is attached to the core and connected to the winding and is mounted on the board. Soldering was used for the connection to the cable. When soldering the winding, pre-soldering such as solder plating is necessary to peel off the coating of the part where the winding is soldered in advance and to ensure soldering. It was the cause.

In order to omit this extra step, as disclosed in Patent Document 1, a coil component is disclosed in which a molten ball is formed by welding and a winding and a terminal fitting are integrated electrically and mechanically.
JP 2005-158825 A

  In order to connect the windings by welding, the terminal fitting includes a fixed portion attached to the core, and an extending portion that becomes a welding location while winding the winding. The extension part which becomes a welding location was extended from the fixed part, and the molten ball formed was connected to the fixed part only at the part where the extension part originally extended from the fixed part. Since the molten ball protrudes from the terminal fitting, there is a possibility that the weld ball may drop off or be damaged when the weld ball comes into contact with other parts or the like only at the above-mentioned connection location. Therefore, an object of the present invention is to provide a coil component that has a stronger weld ball and has increased strength at the connection point.

In order to solve the above problems, the present invention is constituted by melting a core, a conducting wire disposed in the core, a terminal fitting to which the conducting wire is connected, an end portion of the conducting wire and a part of the terminal fitting, It has a weld ball that electrically and mechanically connects the conductor and the terminal fitting. The terminal fitting is attached to the core and extends from the attachment to hold a part of the conductor on the terminal fitting. Provided is a coil component including a holding portion. In this coil component, the terminal fitting and the weld ball are electrically and mechanically connected in the first connection region by welding by melting, and at least mechanically connected by bonding in the second connection region different from the first connection region. Has been. The weld ball and the holding portion are connected in the first connection region, and the weld ball and the mounting portion are connected in the second connection region.

According to such a structure, the mechanical connection location of the molten ball on a terminal metal fitting can be comprised at least two places. Therefore, the molten ball can be firmly joined to the terminal fitting. Note that adhesion in the second connection region means adhesion in a broad sense, and means joining by welding, brazing, soldering, an inorganic / organic adhesive, or the like. Moreover, a 1st connection area | region can be taken large and the connection of the holding | maintenance part and molten ball by a 1st connection area | region can be strengthened more.

  In the above configuration, it is preferable that a plating layer is formed on the terminal fitting, and the second connection region is formed by melting and fixing the plating layer.

  According to such a configuration, it is not necessary to fill a new binder at the time of bonding, and the work can be shortened.

  Moreover, it is preferable that a part of conducting wire on the terminal fitting is fixed to the terminal fitting by adhesion. According to such a structure, a conducting wire can be hold | maintained to a terminal metal fitting more reliably.

It is preferable that a gap is formed between the portion where the second connection region of the terminal fitting is formed and the core.

  According to such a configuration, the heat received by the terminal fitting can be released to the core. Therefore, it is suppressed that the position near the molten ball is melted by the heat received when the molten ball is melted. Further, since the gap is formed as described above, it is possible to suppress the vicinity of the molten ball in the terminal fitting from being excessively cooled. Therefore, it can heat suitably when performing adhesion | attachment with a thermoplastic adhesive.

  According to the coil component of the present invention, the strength of the connecting portion is increased.

  Hereinafter, a coil component and a method for connecting coil components according to an embodiment of the present invention will be described with reference to FIGS. A coil component 1 shown in FIG. 1 mainly includes a core 2, a terminal fitting 5, and a winding 6.

  The core 2 includes a drum core 3 and an outer peripheral core 4. The drum core 3 is configured by arranging substantially disc-shaped flange portions 3A at both ends, and connecting between the flange portions 3A at both ends with a winding core portion (not shown) around which the winding 6 is wound. The outer peripheral core 4 is formed in an approximately annular shape having an octagonal outer shape, and a hole 4a into which the drum core 3 can be inserted is formed in the central portion of the octagon. In addition, a groove-like recess 4 b that continues from the inner surface of the hole 4 a to the outer peripheral surface of the outer core 4 is formed on one end surface (upper end surface) in the penetration direction of the hole 4 a of the outer core 4. The recesses 4b are formed at two locations on one end surface, one side and the other side in the diametrical direction centered on the central axis of the hole 4a. The outer core 4 is disposed on the outer periphery of the drum core 3 so that the drum core 3 is inserted into the hole 4a with the axial direction of the winding core (not shown) as the insertion direction.

  As shown in FIG. 8, the terminal fitting 5 has a base 51 in which phosphor bronze (melting point: about 1000 ° C.) is plated with nickel (melting point: about 1450 ° C.) and tin plating 52 (melting point: about 230 ° C.). As shown in FIG. 1, the outer peripheral core 4 is attached to the concave portion 4b position on one side and the concave portion 4b position on the other side, and extends from the side wall portion and the side wall portion as shown in FIGS. A mounting portion 5A having two arm portions and having a substantially U-shape, a holding portion 5B extending from one arm portion of the mounting portion 5A, and a molten piece 5C extending from the holding portion 5B Has been.

  The mounting portion 5A includes the outer core 4 so that the one arm portion provided with the holding portion 5B is positioned in the recess 4b and the portion constituting the recess 4b of the outer core 4 is inserted into the substantially U-shape. It is attached to. In the mounting portion 5A, one arm portion on which the holding portion 5B is provided is slightly bent inwardly in a U-shape as shown in FIG. Therefore, a gap is formed between the base end portion of one arm portion of the mounting portion 5 </ b> A and the outer peripheral core 4 in a state where the outer peripheral core 4 is mounted.

  The holding portion 5B extends in a direction perpendicular to the above-described diameter direction from the side edge of one arm portion of the mounting portion 5A that extends substantially parallel to the above-described diameter direction in a state where the terminal fitting 5 is mounted on the outer core 4. Configured.

  The molten piece 5C is extended from the holding portion 5B in parallel with the aforementioned diametrical direction and toward the outer peripheral side of the outer core 4 with the terminal metal fitting 5 attached to the outer core 4, as shown in FIG. 2 (b). As described above, the tip of the molten piece 5C is configured to protrude from the side wall portion of the mounting portion 5A.

  Further, the molten piece 5C has a volume smaller than that of the holding portion 5B and is elongated, so that the heat capacity is smaller than that of the holding portion 5B. The molten piece 5C and the end of the winding 6 are melted to form a weld ball 7 (FIG. 1).

  The winding 6 is composed of a conductive wire having an insulating coating, wound around a core (not shown) of the drum core 3, and, as shown in FIG. Pulled out to the position.

  A method of connecting the winding 6 to the terminal fitting 5 in the coil component 1 having the above configuration will be described below. First, a winding 6 that is a coated conductor is prepared (winding preparation step), the drum core 3 and the outer core 4 are prepared (core preparation step), and the terminal fitting 5 is prepared (terminal fitting). Preparation step), mounting the terminal metal fitting 5 on the outer core 4 (mounting step), winding the winding 6 around a core (not shown) of the drum core 3, and pulling out both ends of the winding 6 from the core (not shown). Keep it.

  The drum core 3 wound around the winding 6 and pulled out at both ends is inserted into the hole 4a of the outer peripheral core 4 to which the terminal fitting 5 is attached, and the end of the winding 6 is illustrated as shown in FIG. It is pulled out from the winding core and is placed along the terminal fittings 5 and 5 (arrangement step). In this arrangement step, the winding 6 is arranged so that the most distal end portion of the winding 6 protrudes from the tip of the molten piece 5C, the holding portion 5B is bent at the base end portion, and the holding portion 5B and the mounting portion 5A. Thus, the winding 6 is held. At this time, the tip of the winding 6 and the molten piece 5C are substantially abutted and overlapped.

  With the end of the winding 6 held by the terminal fitting 5, as shown in FIG. 4, the ground electrode 9 is grounded on the other end of the winding 6 (grounding step), and the winding 6 The arc welding machine 8 is brought close to one end side to perform arc discharge, and the arc is landed on the most distal end of one end of the winding 6 (discharge process). Since the winding 6 is held by the holding portion 5B, blurring due to an impact at the time of landing of the arc hardly occurs, and the winding 6 can be reliably landed on the most distal portion. In this discharge process, first, the electric wire of the winding 6 is not melted, but discharge is performed by adjusting the amount of electric power supplied to the arc discharge of the arc welder 9 so that the coating is scattered by the generated heat and impact ( Pre-discharge process). In the state where the coating is peeled off in the pre-discharge process, as shown in FIG. 5, arc discharge is performed with an electric energy that melts the copper wire portion of the winding 6 (main discharge process). By performing the discharge twice in the pre-discharge step and the main discharge step, it is possible to prevent the coating from being caught in the molten portion when the winding 6 is melted. Therefore, it is possible to suppress the formation of sludge due to carbides generated when a large amount of the coating burns rapidly at the time of melting, and the generation of gas, thereby forming a good melted portion.

  Since the molten piece 5C is superposed on the winding 6 and has a configuration protruding from the holding portion 5B and the mounting portion 5A, the arc is suitably landed similarly to the winding 6, and as shown in FIG. In addition, the molten piece 5C is also melted and the melted portion of the winding 6 is wound, so that welding can be suitably performed. Further, since the holding portion 5B provided with the molten piece 5C has a larger heat capacity than the molten piece 5C, even when the melting of the molten piece 5C and the winding 6 proceeds, the holding portion 5B is difficult to melt, and the holding portion 5B Is prevented from melting excessively. Therefore, the holding part 5B can be reliably left by adjusting the electric power (heat amount) of the arc welding machine 9 under the condition that the molten piece 5 is melted but the holding part 5B is not melted.

  Although there is a risk that both the one arm part and the side wall part of the mounting part 5A in the vicinity of the welded part are heated and melted, the side wall part is in contact with the outer core 4 as shown in FIG. Heat is diffused to the outer core 4 from the position of contact with the outer core 4. Therefore, it is suppressed that the heat at the time of welding is stored in the mounting portion 5A, and the mounting portion 5A is suppressed from melting. In addition, since a gap is formed between one arm portion of the mounting portion 5A and the outer core 4, the one arm portion of the mounting portion 5A is heated to a certain degree of high heat (a degree to which the tin plating 52 is melted: 230 degrees or more). Thus, the tin plating 52 is melted. As shown in FIG. 7, the welding by welding between the terminal fitting 5 on one side and the winding 6 is finished in a state where the welding ball 7 is formed by proceeding to the position of the holding portion 5 </ b> B. As shown in FIG. 1, the welding ball 7 is formed on one arm portion of the mounting portion 5A, but since one arm portion of the mounting portion 5A is located in the recess 4b of the outer core 4, It is suppressed that the welding ball 7 protrudes excessively from the upper surface of the outer peripheral core 4.

  In a state where the connection by welding has been completed, the welding ball 7 is connected to the holding portion 5B and connected to the winding 6 as shown in FIG. By connecting so as to bite into the holding portion 5B, a large connection location (first connection region) can be taken, and the connection between the holding portion 5B and the weld ball 7 can be further strengthened. In one arm portion of the mounting portion 5A, the tin plating 52 is melted by heat at the time of forming the weld ball 7, and then fixed, thereby connecting the weld ball 7 and the position of the one arm portion of the mounting portion 5A (second). Connection area). Since the tin plating 52 is plated and configured when the terminal fitting 5 is manufactured, it is not necessary to prepare a binder for bonding the welding ball 7 and the mounting portion 5A, and the work can be shortened. The tin plating 52 is not necessarily formed on both surfaces of the terminal fitting 5 (two surfaces: a surface in contact with the outer core 4 and a surface on which the end of the winding 6 and the surface mounted on the substrate (not shown) are arranged). It is not necessary to be formed, and it may be formed only on the mounting surface of the terminal metal fitting 5 on the substrate (not shown) and the surface on which the end of the winding 6 is disposed.

  Moreover, the welding ball 7 will be supported by two places, the holding | maintenance part 5B and the mounting part 5A, and the welding ball 7 is firmly fixed to the terminal metal fitting 5, and is hold | maintained suitably. Therefore, even if the weld ball 7 comes into contact with other parts or the like, it is possible to suppress the weld ball 7 from falling off from the terminal fitting 5 and to suitably hold the connection point. Further, the molten tin plating 52 connects the unwelded portion of the winding 6 to the holding portion 5B and the mounting portion 5A. Therefore, it is possible to hold the winding 6 more firmly in the holding portion 5B.

  Also in the terminal fitting 5 and the winding 6 on the other side, the coil component 1 shown in FIG. 1 is completed by performing the connection by arc welding similarly to the welding of the terminal fitting 5 and the winding 6 on the one side. . In the connection of the terminal fitting 5 on the other side, since the terminal fitting 5 on one side and the winding 6 are already electrically connected, the ground electrode 8 is connected to the terminal fitting 5 on the one side for grounding. Take it.

  In the present embodiment, the terminal fitting 5 and the welding ball 7 are bonded in the second bonding region using the tin plating 52 as a binder. However, the bonding means is not limited to this, and a thermoplastic resin, a general adhesive, or The terminal fitting 5 and the welding ball 7 may be bonded together using welding or the like. Moreover, as shown in FIG. 9 as a first modification, the tip of the molten piece 5C may be tapered. According to such a configuration, the arc is likely to land. As a second modification, as shown in FIG. 10, the width may be gradually increased from the distal end portion of the molten piece 5C toward the holding portion 5B (base end portion). According to such a configuration, it is possible to make it difficult to melt the proximal end portion of the molten piece 5C, and it is possible to suppress the holding portion 5B located on the proximal end side of the molten piece 5C from being excessively melted.

  In FIG. 3, the molten pieces 5 </ b> C and the winding 6 are overlapped so as to be in contact with each other. However, the molten pieces 5 </ b> C are not necessarily in contact with each other, and the molten piece 5 </ b> C may be located in the vicinity of the end of the winding 6. In this case, as shown in FIG. 5, when the end of the winding 6 melts and expands, the molten piece 5C located in the vicinity of the winding 6 and the winding 6 come into contact with each other, and are electrically connected. An arc can also land on the molten piece 5C.

  The present invention is not limited to the embodiment described above, and various modifications and improvements can be made within the scope described in the claims. For example, as a modified example, as shown in FIG. 11, in the core 102 composed of the core portion 103 and the flange portions 104 provided at both ends of the core portion 103, similarly to the terminal fitting 5 of the embodiment. The terminal fitting 105 provided with the mounting portion 105A, the holding portion 105B, and the molten piece 105C is mounted on the flange portion 104. Then, the winding 106 is wired on the terminal fitting 105, and the end of the winding 106 and the molten piece 105C are welded in the same manner as in the embodiment, so that the welding ball 7 of the embodiment as shown in FIG. The same weld ball 107 can be formed.

The perspective view in the completed state of the coil components which concern on embodiment of this invention. The (a) front view and (b) side view in the terminal fitting of the coil components which concern on embodiment of this invention. The perspective view in the state before the connection of the coil components which concern on embodiment of this invention. The top view of the state which was the process concerning the connection of the coil components which concern on embodiment of this invention, and the arc landed on the coil | winding. The top view of the state which was the process concerning the connection of the coil components which concern on embodiment of this invention, and the coil | winding was fuse | melted. The top view of the state which is a process concerning the connection of the coil components which concern on embodiment of this invention, and the molten piece was fuse | melted. The top view of the state which was the process concerning the connection of the coil components which concern on embodiment of this invention, and the connection in one terminal metal fitting was complete | finished. Schematic of the cross section along the VII-VII line of FIG. The fragmentary top view which concerns on the 1st modification of the fusion | melting piece of the coil components which concern on embodiment of this invention. The fragmentary top view which concerns on the 2nd modification of the fusion | melting piece of the coil components which concern on embodiment of this invention. The top view of the coil components which concern on the modification of embodiment of this invention. The fragmentary perspective view of the collar part with which the terminal metal fitting of the coil components which concerns on the modification of embodiment of this invention was mounted | worn.

Explanation of symbols

1 .. Coil parts 2.. Core 3.. Drum core 3 A.. Ridge 4.. Outer core 4 a ... Hole 4 b ... Recess 5 ... Terminal fitting 5 A ... Mounting part 5B ... Holding part 5C ... Melting Piece 6 ・ ・ Winding 7 ・ ・ Welding ball 8 ・ ・ Arc welding machine 9 ・ ・ Ground electrode 51 ・ ・ Base material 52 ・ ・ Tin plating

Claims (4)

The core,
A conducting wire disposed in the core;
A terminal fitting to which the conducting wire is connected;
An end portion of the conductive wire and a part of the terminal fitting are configured to be melted, and includes a welding ball that electrically and mechanically connects the conductive wire and the terminal fitting,
The terminal fitting includes a mounting portion attached to the core, and a holding portion that extends from the mounting portion and holds a part of the conductive wire on the terminal fitting,
The terminal fitting and the weld ball are electrically and mechanically connected in a first connection region by welding by the melting, and at least mechanically connected by adhesion in a second connection region different from the first connection region. The coil component , wherein the weld ball and the holding portion are connected in the first connection region, and the weld ball and the mounting portion are connected in the second connection region . A plating layer is formed on the terminal fitting,
The coil component according to claim 1, wherein the second connection region is formed by melting and fixing the plating layer.   3. The coil component according to claim 1, wherein a part of the conducting wire on the terminal fitting is fixed to the terminal fitting by bonding. 4.   The coil component according to any one of claims 1 to 3, wherein a gap is formed between a portion of the terminal fitting in which the second connection region is formed and the core. .

Images