JPH0582013U - Inductance parts - Google Patents

Abstract

(57) [Summary] [Purpose] The bobbin 10 can be made thin while maintaining the strength of the winding shaft 12, and the bobbin 10 can be reliably positioned on the chuck during winding. [Structure] A bobbin 10 having a base portion 11 having terminals 20 planted on its side surface and a cylindrical winding shaft 12 protruding from the base portion 11,
In an inductance component having a magnetic core 70 inserted into the winding shaft 12, a plurality of ribs 18 are formed inside the winding shaft 12 along the axial direction, and the side surfaces of the core 70 corresponding to the ribs 18 are formed. A plurality of recesses 78 are provided in the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a small inductance component.

[0002]

[Prior art and its problems]

 To wind a wire rod on a bobbin of a coil or a transformer with an automatic winding machine, a chuck of the winding machine is inserted into a hole of a winding shaft of the bobbin and the chuck is rotated. However, since the thickness of the winding shaft has become thinner as the winding parts have become smaller, the winding shaft may be distorted if it is strongly held by the chuck. There was a problem that the position could not be determined. Increasing the thickness of the winding shaft not only makes it difficult to downsize it, but also poses another problem that the electrical characteristics deteriorate.

[0003]

[The purpose of the device]

 An object of the present invention is to provide a winding component which can be thinned while maintaining the strength of the bobbin winding shaft and which can surely position the bobbin on the chuck during winding and which can be miniaturized.

[0004]

[Means for Solving the Problems]

 The present invention comprises an insulative bobbin having a base portion having a plurality of terminals planted on the side surface and a cylindrical winding shaft protruding from the base portion, and a magnetic core inserted in the winding shaft. A feature is that a plurality of ribs along the axial direction are formed inside the winding shaft, and a plurality of recesses are provided on the side surface of the core corresponding to the ribs.

[0005]

【Example】

 1 to 3 show an embodiment in which the present invention is applied to a high-frequency step-up transformer, FIG. 1 is an exploded perspective view of essential parts, FIG. 2 is a front sectional view, and FIG. 3 is a side sectional view. . The lower bobbin 10 made of plastic is provided with a base portion 11 in which a plurality of terminals 20 are planted on two opposite side surfaces, and a cylindrical winding shaft 12 protruding upward from the center of the base portion 11. A collar 13 is provided on the upper end of the winding shaft 12. Inside the through hole 17 of the winding shaft 12, three ribs 18 are provided along the central axis direction. As is apparent from FIG. 2, the terminal 20 is laterally extended so that the lower surface of its tip is in the same horizontal position as the lower end of the lower bobbin 10 and formed into an imposition die. A slit 14 and a slit 15 reaching the vicinity of the winding shaft 12 are provided at the centers of the two side surfaces of the base portion 11 on which the terminals 20 are planted.

The upper bobbin 30 includes a cylindrical winding shaft 32 and a collar 33, and a hook-shaped locking piece 36 is provided at the lower end of the winding shaft 32. The through hole 31 of the winding shaft 32 is formed to be larger than the diameter of the collar 13 of the lower bobbin 10. Grooves 16 are formed in the base portion 11 at positions intersecting with the slits 14 and 15 so as to correspond to the locking pieces 36. The upper bobbin 30 is fixed by inserting the locking shaft 36 into the groove 16 while inserting the winding shaft 12 into the through hole 31 of the winding shaft 32 and fitting it into the lower bobbin 10. Then, the low-pressure side inner winding 40 is wound around the winding shaft 12 of the lower bobbin 10, and the high-voltage side outer winding 50 is wound around the winding shaft 32 located outside the inner winding 40. It is wound in multiple layers in the direction perpendicular to the central axis.

Although not shown, the lead wire of the inner winding 40 is drawn out through one slit 14 and is connected to the terminal 20 implanted on one side surface of the bobbin 10. The lead wire of the outer winding 50 is drawn out through the other slit 15 and is connected to the terminal 20 planted on the other side surface of the bobbin 10. As the inner winding 40, a feedback winding or the like may be wound together with the primary winding.

The pair of magnetic cores 60 and 70 are abutted against each other with the lower bobbin 10 sandwiched therebetween from above and below to form a closed magnetic path. The upper core 60 has a flat plate shape, and the lower core 70 has an E-shaped cross section. The lower core 70 includes a flat plate portion 71, outer legs 72 integrally formed at both ends thereof, and a cylindrical central leg 73 integrally formed at the center of the flat plate portion 71. Three vertical grooves 78 are formed on the side surface. The center leg 73 is inserted into the through hole 17 of the winding shaft 12 so that the rib 18 enters the groove 78. It should be noted that the protruding dimension of the rib 18 is formed slightly larger than the depth of the groove 78 of the central leg 73 of the core in advance, and the central leg 73 is attached to the winding shaft 12 while crushing the head of the rib 18 at the groove 78. The lower bobbin 10 and the core 70 may be tightly fitted by inserting them.

As the chuck of the winding machine that holds the lower bobbin 10 when winding the transformer, for example, a chuck 80 as shown in FIGS. 4 and 5 may be used. The chuck 80 is made by dividing the tip of an elastic metal rod into three parts, and moving the rod 81 passing through the hole in the center in the longitudinal direction to open and close the divided tip part. On the side surface thereof, a recess 82 corresponding to the rib 18 of the winding shaft 12 is formed. To wind the wire, insert the chuck 80 with the tip closed into the through hole 17 of the winding shaft 12, engage the rib 18 with the recess 82, and then open the tip to secure the lower bobbin 10 to the chuck 80. Fix it. Then, after rotating the chuck 80 to wind the inner winding 40 around the winding shaft 12, the upper bobbin 30 is fixed to the lower bobbin 10, and the chuck 80 is rotated again to wind the outer winding 50 around the winding shaft 32. Just turn it. The ends of each wire are wound around predetermined terminals 20 by known means before and after winding around the winding shaft, and unnecessary portions of the ends are removed.

[0010]

[Effect of the device]

 According to the present invention, the wall thickness of the entire winding shaft 12 can be reduced without lowering the strength, and the electrical characteristics are improved. Further, by engaging the rib and the concave portion of the chuck, the bobbin can be positioned with respect to the chuck, and the holding strength of the chuck is increased, so that the bobbin is prevented from idling. Furthermore, if the rib protrusion size is made slightly larger than the depth of the groove of the central leg of the core, the bobbin and the core can be tightly fitted together.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts of a transformer showing an embodiment of the present invention.

FIG. 2 is a front sectional view of the transformer.

FIG. 3 is a side sectional view of the transformer.

FIG. 4 is an explanatory diagram of a winding process

5 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 10 Lower bobbin 11 Base part 12 Winding shaft 18 Rib 40 Inner winding 70 Core 73 Central leg 78 Recess

Claims (1)

[Scope of utility model registration request] 1. An insulating bobbin having a base portion having a plurality of terminals planted on its side surface and a cylindrical winding shaft projecting from the base portion, and a magnetic core inserted into the winding shaft. An inductance component characterized in that a plurality of ribs along the axial direction are formed inside the winding shaft, and a plurality of recesses are provided on the side surface of the core so as to correspond to the ribs.