JPS6031232Y2 - choke coil - Google Patents

Description

【考案の詳細な説明】 本考案は二つの壷形コアとこれらを突合せてできる空間
に収納されるコイルとの組合せによるチョークコイルに
関する。[Detailed Description of the Invention] The present invention relates to a choke coil that is a combination of two pot-shaped cores and a coil that is housed in a space created by butting these cores together.

この種のチョークコイルは、第１図に示すように、ねじ
挿通用の中心通孔と環状凹部とを有する壷形コア１，１
′の凹部側の端面を互いに突合せてできる環状空間２に
コイル３が収納され、コア１．１′の反対端面にはそれ
ぞれこれとほぼ同じ面積の保持板４，４（例えば、ベー
クライト板）を当接し、保持板４及びコア１，１′の中
心に設けた通孔にねじ５を挿通してナツト６で締付ける
ことにより組立てを行なっていた。As shown in FIG. 1, this type of choke coil has a pot-shaped core 1, which has a central through hole for screw insertion and an annular recess.
A coil 3 is housed in an annular space 2 formed by abutting the concave side end surfaces of the core 1.1' against each other, and retaining plates 4, 4 (for example, Bakelite plates) having approximately the same area as the core 1.1' are respectively provided on the opposite end surfaces of the core 1.1'. Assembly was carried out by inserting a screw 5 into a through hole provided at the center of the holding plate 4 and the cores 1, 1' and tightening with a nut 6.

ところでこのようなチョークコイルにおいては、コイル
３に供給する電流値が所定範囲内の時コア１，１′によ
り磁心が飽和しないように、中央部の端面間に間隙ｇを
形成している。Incidentally, in such a choke coil, a gap g is formed between the end faces of the central portion so that the magnetic core is not saturated by the cores 1 and 1' when the current value supplied to the coil 3 is within a predetermined range.

ところがこのような間隙ｇを形成すると、ねじ５とナツ
ト６との締付はトルクが大き過ぎた場合にコア１゜１′
に割れが生ずるという欠点があった。However, if such a gap g is formed, if the tightening torque of the screw 5 and nut 6 is too large, the core 1°1'
The disadvantage was that cracks occurred.

例えば、コア外径、高さく図中Ｌ）がそれぞれ３６７７
１１１！、２２咽、間隙ｇが２耽、ベークライトによる
保持板４の厚さが約３閣、ねじ５の直径が３胴の場合、
締付はトルクが２．５に９・ｍで割れの発生率が５０％
にも達していた。For example, the core outer diameter and height (L in the figure) are each 3677
111! , 22 mm, the gap g is 2 mm, the thickness of the Bakelite holding plate 4 is about 3 mm, and the diameter of the screw 5 is 3 mm,
When tightening the torque is 2.5 to 9 m, the cracking rate is 50%.
It had also reached

本考案はこのような欠点を解消したチョークコイルを提
供しようとするものである。The present invention aims to provide a choke coil that eliminates these drawbacks.

本考案は、突合された二つのコアの反対端面とこれに当
接される保持板との二つの接合部のうち少なくとも一方
の接合部の一方の接合面に凹部を形成して、コア端面の
外縁近傍のみに保持板が当接するようにしたものである
。In the present invention, a concave portion is formed in one joint surface of at least one of the two joints between the opposite end surfaces of the two butted cores and the retaining plate abutted thereon, and the core end surface is The retainer plate contacts only near the outer edge.

以下に本考案の実施例を説明する。Examples of the present invention will be described below.

第２図は本考案の一実施例を断面図で示し、従来同様、
壷形コア１，１′をこれらの間にコイル３を収納するよ
うにして突合せ、コア１，１′の反対端面に保持板７，
７を当接してこれらをねじ５とナツト６とで締付けてい
る。FIG. 2 shows a cross-sectional view of an embodiment of the present invention.
The pot-shaped cores 1 and 1' are butted together with the coil 3 housed between them, and a retaining plate 7 is placed on the opposite end surface of the cores 1 and 1'.
7 are in contact with each other and are tightened with screws 5 and nuts 6.

コイル３からのコア１，１′外へのリード線の引出しは
、例えばコア１と１′との接合端面の一方にリード線導
出用の溝を形成することにより行なわれる。The lead wires can be drawn out from the coil 3 to the outside of the cores 1, 1' by, for example, forming a groove for leading out the lead wires on one of the joining end surfaces of the cores 1 and 1'.

保持板７，７′はそれぞれ、コア１，１′との接合面に
コア１，１′の外側環状部と同程度の幅の環状部７０．
７０’を残して凹部７１．７１’が形成されている。The holding plates 7, 7' each have an annular part 70. which has a width comparable to the outer annular part of the cores 1, 1' on the joint surfaces with the cores 1, 1'.
Recesses 71 and 71' are formed except for 70'.

なおコア１，１′は、通常酸化物磁性材料（フェライト
）から成る一種の焼物で元来圧縮強度が大きく引張強度
は小さい。Note that the cores 1 and 1' are usually a type of ceramic made of oxide magnetic material (ferrite), and originally have a high compressive strength and a low tensile strength.

このようなコア１゜１′に対し、本考案の構成によれば
ねじ５とナツト６との締付は力は、保持板７，７′の環
状部７０．７０’を介してコア１，１′の外周端部だけ
に圧縮力として加わるだけで引張力はほとんど発生せず
、このことによりコア１，１′の割れの発生を防止でき
る。According to the configuration of the present invention, the force for tightening the screw 5 and the nut 6 is applied to the core 1, 1' through the annular portions 70, 70' of the retaining plates 7, 7'. Since the compressive force is applied only to the outer peripheral end of the core 1', almost no tensile force is generated, thereby preventing the cores 1, 1' from cracking.

第３図は本考案の他の実施例を示し、コア１側だけに環
状部７０を有する保持板７を用いたものである。FIG. 3 shows another embodiment of the present invention, in which a holding plate 7 having an annular portion 70 only on the core 1 side is used.

勿論、コア１′側にこれを適用しても良く、保持板は平
板状のままでコア１，１′の端面に凹部を形成するよう
にしても同等の効果が期待できる。Of course, this may be applied to the core 1' side, and the same effect can be expected even if the holding plate remains flat and recesses are formed on the end faces of the cores 1, 1'.

以上説明してきたように１、本考案によれば壷形コア１
，１′に加わる締付は力をコア１，１′の外周端部だけ
で受けるのでコア割れは発生しにくくなり、高信頼性の
チョークコイルが提供できる。As explained above, 1. According to the present invention, the pot-shaped core 1
, 1' is applied only to the outer peripheral ends of the cores 1, 1', so core cracking is less likely to occur, and a highly reliable choke coil can be provided.

またコア１，１′の保持板との接合面の平坦度は、従来
の如き全面接触の場合はど精度は要求されず、このこと
によりコアの仕上げ工数が削減できるという効果も得ら
れる。Further, the flatness of the joint surfaces of the cores 1 and 1' with the holding plate does not require high precision in the case of full-surface contact as in the conventional case, and this has the effect that the number of man-hours required for finishing the cores can be reduced.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来のチョークコイルの一例の断面図、第２図
は本考案の一実施例の断面図、第３図は他の実施例の断
面図。 図中、１，１′は壷形コア、３はコイル、４゜７．７′
は保持板、５はねじ、６はナツト。FIG. 1 is a sectional view of an example of a conventional choke coil, FIG. 2 is a sectional view of one embodiment of the present invention, and FIG. 3 is a sectional view of another embodiment. In the figure, 1 and 1' are pot-shaped cores, 3 is a coil, and 4°7.7'
is a holding plate, 5 is a screw, and 6 is a nut.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 中心通孔と環状凹部とを有する二個のコアを、これらの
コアを突合せてできる環状空間にコイルを収納して突合
せ、該突合せ面と反対側の端面にはそれぞれ中心に通孔
を有する前記端面と同形状の保持板を当接し、該保持板
の通孔及び二つのコアの通孔へねじを挿通してナツトと
の締付けにより組立てを行なうようにしたチョークコイ
ルにおいて、少なくとも一方の前記保持板とコア端面と
の接合部のうち一方の接合面にその外縁部を残して凹部
を形成して、前記コア端面の外縁近傍のみに前記保持持
が当接するようにしたことを特徴とするチョークコイル
。Two cores each having a central through hole and an annular recess are butted together by storing a coil in an annular space formed by butting these cores, and each end face opposite to the abutting surface has a through hole at the center. In a choke coil that is assembled by abutting a holding plate having the same shape as the end face, inserting screws into the through holes of the holding plate and through holes of the two cores, and tightening them with nuts, at least one of the holding plates is attached. A choke characterized in that a concave portion is formed in one joint surface of the joint between the plate and the core end surface, leaving an outer edge thereof, so that the retainer comes into contact only in the vicinity of the outer edge of the core end surface. coil.