JPH06105663B2 - Inductance element manufacturing method and inductance element - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an inductance element and an inductance element, and more particularly to a method of manufacturing an inductance element and an inductance element in which a split core is sandwiched from both sides by fasteners, for example.

[Prior art]

In this type of inductance element, in order to cover the split core with the metal stopper, for example, as shown in FIG.
On the split core 1 composed of two U-shaped split cores, a substantially U-shaped stopper fitting 2 is arranged, and both legs 3 and 4 of the stopper 2 are spread outward respectively, and then both legs 3 and 4 are formed. 3 to sandwich the split core 1 from both ends, or as shown in FIG. 3B, hook one leg 3 of the fastener 2 on one end of the split core 1 and spread the other leg 4 outward. There was a way to sandwich it.

[Problems to be Solved by the Invention]

However, in these conventional methods, the legs 3 and 4 may be unnecessarily widened to exceed the elastic limit of the stopper 2. In this case, the pressure applied to the split core 1 is weakened, and as a result, electrical characteristics such as inductance are also unstable.

Therefore, a main object of the present invention is to provide a method of manufacturing an inductance element and an inductance element in which the split cores are securely fixed and the electric characteristics are stable.

[Means for Solving the Problems]

Briefly, a first aspect of the present invention is a method of manufacturing an inductance element in which a split core is sandwiched from both ends by both legs of a substantially U-shaped fastener, and protrusions are formed near both ends of an upper surface thereof. Prepared plate member, put the stopper on the plate member so that the lower surface of the body of the stopper fits on the protrusion of the plate member, press the body of the stopper between the protrusions, and press the legs of the stopper together. Is expanded outward, and both ends of the split core are fitted between both legs of the stopper in that state, and the method is a method for manufacturing an inductance element.

In a second aspect of the invention, in brief, in an inductance element in which a split core is sandwiched between both ends of a substantially U-shaped stopper, the stopper has protrusions formed on the upper surface near both ends. The inductance element is characterized in that it is disposed on a plate member, and both ends of the split core are fitted between both legs of the stopper.

[Action]

When the body of the metal fitting is pressed between the protrusions of the plate member, the body bends due to elastic deformation, and both legs formed by extending from both ends of the body have a certain width outward depending on the height of the protrusion. Spread to. In that state, both ends of the split core are arranged between both legs of the fastener, and then the pressing of the body of the fastener is released. Then, the body part elastically restores, and both legs try to return to the original state. At this time, the inward force of both legs becomes the pressing force from both ends of the split core, and the split core is fixed integrally.

〔The invention's effect〕

According to the present invention, the spread width of both legs is uniquely determined by the height of the protrusion, not by the force of pressing the body portion, so that it is prevented from expanding too far beyond the elastic limit of the fastener as in the conventional case. it can. Therefore, the pressure applied to the split cores can be stably and reliably obtained, and the electrical characteristics such as the inductance can be stabilized.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

〔Example〕

Referring to FIG. 1 and FIGS. 2A to 2D, the inductance element 10 of this embodiment includes a case 12 having a bottom opening. The case 12 includes a quadrangular ceiling plate 14 and four side walls 16, and a stopper 30 to be described later is provided in the central portion longitudinal direction of the ceiling plate 14.
A groove 18 having a width corresponding to the body portion 32 is formed.
In addition, holes 20 are formed at both ends of the groove 18 so that both legs 34 of the stopper 30 can pass therethrough, and the groove 18 is provided near both ends of the groove 18.
Protrusions 22 are formed on the bottom surface of each. In this way, the plate member 24 is integrally formed on the ceiling plate 14 of the case 12.

The plate member 24 having such a protrusion may be formed separately from the case 12.

Also, the side walls on both sides orthogonal to the extension direction of the groove 18 of the case 12
Slits 26 are respectively formed from 16 to a part of the ceiling plate 14, thereby forming inwardly facing claw-shaped pressing portions 28 in the vicinity of both ends of the groove 18, respectively. This presser section 28
Prevents the fastener 30 placed on the groove 18 from coming off the groove 18.

On the groove 18 of the case 12 thus formed, as shown in FIG. 2B, a substantially U-shaped stopper 30 is placed.
That is, the fastener 30 is arranged on the groove 18 so that the lower surface of the body portion 32 of the fastener 30 rests on the protrusion 22 of the groove 18, and the two leg portions 34 extending downward from both ends of the body portion 32 are provided. The grooves 20 are inserted into holes 20 formed at both ends of the groove 18, respectively.

Thereafter, as shown in FIG. 2C, the body portion 32 of the fastener 30 is pressed between the protrusions 22, and each leg portion 34 of the fastener 30 is spread outward with the protrusion 22 as a fulcrum. That is, by pressing the body portion 32, the body portion 32 bends, and accordingly, the tips of the legs 34 extending from both ends of the body portion 32 are displaced outward.
At this time, the spread width of the leg portion 34 is uniquely determined by the height of the protrusion 22. That is, even if the pressing force on the body portion 32 is made too strong, the body portion 32 hits the bottom surface of the groove 18 and is not curved any more. Therefore, it is possible to reliably prevent the legs 34 from being excessively widened.

In this state, a split core 38 composed of two U-shaped split cores, each of which has a bobbin 36 around which a coil such as a common mode choke coil is wound, is fitted in its leg portion, as shown in FIG. 2C. Then, insert into the case 12. Then, both ends of the split core 38 are fitted between the leg portions 34 of the stopper 30 that is opened first.

After that, the pressing force of the body 32 of the stopper 30 is released. Then, the curvature of the body portion 32 is restored, and each leg portion 34 tries to return to its original state. At this time, the force acting on the inside of each leg portion 34 becomes the pressing force from both ends of the split core 38,
As a result, the split cores 38 are pinched and securely fixed together, as can be seen from FIG. 2D.

Then, by fixing the bobbin 36 in the case 12, the split core
38 will no longer come off the stop 30.

Further, in this embodiment, if an insulating material is used for the case 12, a coil and a stopper not shown which are wound around the bobbin 36 are shown.
The distance to 30 can be shortened, and as a result, the case 12 can be downsized, and the inductance element 10 can be downsized.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention. 2A to 2D are schematic views sequentially showing the manufacturing method of this embodiment, FIG. 2A is a schematic view showing a case, and FIG. 2B is a schematic view showing a state in which a stopper is placed in a groove of the case. FIG. 2C is an illustrative view showing a state where the body of the fastener is pushed to fit the split core, and FIG. 2D is an illustrative view showing a state where the fastener sandwiches the split core. FIG. 3A and FIG. 3B are schematic views showing a conventional technique. In the figure, 10 is an inductance element, 12 is a case, and 14
Is a ceiling plate, 18 is a groove, 20 is a hole, 22 is a protrusion, 24 is a plate member, 28
Is a retainer, 30 is a stopper, 32 is a body, 34 is a leg, and 38 is a split core.

Front page continuation (72) Inventor Yasuhiro Miyaya, 26-20 Tenjin, Tenjin, Nagaokakyo, Kyoto Murata Manufacturing Co., Ltd. (56) References Showa 59-104512 (JP, U)

Claims (4)

[Claims] 1. A method of manufacturing an inductance element in which a split core is sandwiched from both ends by both legs of a substantially U-shaped stopper, and a plate member having protrusions formed near both ends of its upper surface is prepared. Mounting the stopper on the plate member so that the lower surface of the body of the stopper fits on the protrusion of the plate member, and pressing the body of the stopper between the protrusions to support both legs thereof. Is spread outward, and in that state, both ends of the split core are fitted between both legs of the stopper,
Inductance element manufacturing method. 2. An inductance element in which a split core is sandwiched from both ends by both legs of a substantially U-shaped stopper member, wherein the stopper member is provided on a plate member having protrusions formed near both ends of the upper surface thereof. The inductance element is characterized in that both ends of the split core are fitted between both legs of the stopper. 3. A case including a ceiling plate is further provided, wherein a groove having a width corresponding to a body portion of the stopper is formed in the ceiling plate of the case, and the leg portions pass through both ends of the groove. 3. The inductance element according to claim 2, wherein the hole is formed, and protrusions are formed near both ends of the bottom surface of the groove, whereby the plate member is integrally formed with the ceiling plate of the case. 4. The inductance element according to claim 3, wherein the case includes pressing portions which are formed near both ends of the groove and which press the stopper fitting on the bottom surface of the groove.