JPH11230183A - Shaft fixing structure, and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the abutting on and body-touch to a commonly used member by providing a projecting reduced part on a shaft erection side around a periphery to attach and fix a shaft of a plate member, providing a tip part of the reduced part forming an annular flat surface, and forming the body fitting to another member in which the flat surface is fitted to the shaft. SOLUTION: A conical reduced part 6-11 is formed on a shaft erection side in the center of a base plate part 6-1 in which blades 6 of the prescribed number are punched in the outer circumferential edge of a stock plate, and a small hole 6-12 for inserting a shaft is cut in the center of the conical reduced part 6-11. A tip of a rotor shaft 5 is inserted in and fitted to the small hole 6-12 for inserting the shaft, and a tip of the conical reduced part 6-11 is reduced in a reverse direction so as to form a flat surface 6-13. The flat surface 6-13 is formed as a slidably contact part with another member such as a bearing 4 abutted thereon, the material of the plate member can be bitten by the shaft surface in a similar manner to the caulking work in the reducing work in the reverse direction, and the fixing and tightening force can be obtained.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、構成の簡素化と共
に、軸方向に厳しい寸法規制を求められる薄型軸流ファ
ン等の実現を目的とする。BACKGROUND OF THE INVENTION The present invention aims at realizing a thin axial flow fan or the like which requires strict size control in the axial direction while simplifying the structure.

【０００２】[0002]

【従来の技術】電子機器の小型化、軽量化の流れで厳し
い薄型化を求められている軸流ファン等では、軸方向の
寸法を左右する要素として、固定子や回転子を構成する
夫々の構造や結合手段についても厳しい改善を求めら
れ、夫々の素材厚さの占める僅かな寸法さえもが考慮対
象として必須の状態となっている。2. Description of the Related Art In an axial flow fan or the like which is required to have a strict thickness due to the trend of miniaturization and weight reduction of electronic equipment, each of components constituting a stator and a rotor is an element which determines an axial dimension. Strict improvements are also required in the structure and coupling means, and even the small dimensions occupied by the respective material thicknesses are indispensable for consideration.

【０００３】詳細は省略するが、ベンチュリケースを有
し、駆動用モータの外周面でプロペラを回転駆動する軸
流ファンでは、固定子の構成や該固定子と軸方向に重な
るように配置される回転子ヨークを形成する基板部とが
不可欠であるので、回転子を回転自在に保持する回転子
軸の固着締結も、この締結手段が軸方向寸法への影響を
排除すべく種々の改善が見られる。[0003] Although not described in detail, an axial fan having a venturi case and rotating a propeller on the outer peripheral surface of a driving motor is arranged so as to overlap with the stator in the axial direction. Since the substrate portion forming the rotor yoke is indispensable, various improvements have been made in the fixed fastening of the rotor shaft for rotatably holding the rotor so that this fastening means does not affect the axial dimension. Can be

【０００４】図９はアウタロータ型駆動用モータを使用
した軸流ファンの回転子の例を示し、回転子主体を構成
する円筒状永久磁石７を保持する回転子ヨークの円板状
基板部６−１の中央に回転子軸５を固着締結するが、該
例では、上記回転子ヨークの基板部６―１に軸嵌合孔６
−１２を穿設して該軸嵌合孔６−１２に当該回転子軸５
の先端を嵌着した状態で、基板部６―１の回転子軸周辺
の肉を前後から加圧変形させるいわゆるコーキングで固
着締結するもので、該例では軸方向の締結力確保手段と
して当該回転子軸５に溝５−１を形成し、該溝５−１に
コーキングによるヨーク側の肉を潜り込ませるようにし
ている。FIG. 9 shows an example of a rotor of an axial fan using an outer rotor type driving motor, and a disk-shaped substrate portion 6-of a rotor yoke for holding a cylindrical permanent magnet 7 mainly comprising the rotor. The rotor shaft 5 is fixedly fastened to the center of the rotor yoke 1. In this example, a shaft fitting hole 6 is formed in the substrate portion 6-1 of the rotor yoke.
-12, and the rotor shaft 5 is inserted into the shaft fitting hole 6-12.
In the state in which the tip of the base member is fitted, the meat around the rotor shaft of the substrate portion 6-1 is fixedly fastened by so-called caulking which pressurizes and deforms the meat from the front and rear. A groove 5-1 is formed in the slave shaft 5, and the meat on the yoke side by caulking is sunk into the groove 5-1.

【０００５】又、図１０はアキシャルギャップ型駆動用
モータを使用した軸流ファンの回転子の例を示し、プロ
ペラと一体を成す回転子ヨークの円板状基板部６―１の
中央に回転子軸５を固着締結するが、該例では、基板部
６―１の中央部に当該回転子軸５の外径に対応する内径
寸法を備える小径円筒部６―１４を形成するいわゆるバ
ーリングでの締結部形成の例である。FIG. 10 shows an example of a rotor of an axial fan using an axial gap type driving motor. The rotor is provided at the center of a disk-shaped substrate portion 6-1 of a rotor yoke integral with a propeller. The shaft 5 is fixedly fastened. In this example, a small-diameter cylindrical portion 6-14 having an inner diameter corresponding to the outer diameter of the rotor shaft 5 is formed at the center of the substrate portion 6-1 by so-called burring. It is an example of part formation.

【０００６】[0006]

【発明が解決しようとする課題】上述の如き従来の構成
は、回転子背面からの軸の突出や、軸に嵌合される軸受
等の別部材に対応する安定した胴当たり構成を得るため
にスぺーサー等の併用を余儀なくされていた。SUMMARY OF THE INVENTION As described above, the conventional structure is to obtain a stable body contact structure corresponding to the protrusion of the shaft from the back of the rotor or another member such as a bearing fitted to the shaft. Combined use of spacers, etc. was required.

【０００７】[0007]

【課題を解決するための手段】本発明に成る軸の固定構
造は、板状部材の当該軸を嵌着固定する周囲に軸直立側
に凸の絞込部を備え、該絞込部先端が円環状平面を成
し、該平面が前記軸に嵌合される別部材との胴当りを形
成し、前記軸の直立固定結合部表面が、軸心に対し同心
で円周方向に等配の凹凸形状もしくは軸心に対し同心円
部と共に非円形部を有し、又、軸心に対しほぼ同心を成
す溝が形成され、特に該締結手段が薄型軸流ファンの羽
根車を一体的に保持する回転子と回転子軸との締結手段
として利用され、該締結嵌着手段は、板状部材の軸嵌着
部位に、当該軸径よりも小さな径の小孔を穿設すると共
に当該軸嵌着部位を中心として当該軸の直立方向に凸の
絞込部を形成し、前記小孔に軸を挿通して前記絞込部先
端を板状部材平面と並行するように逆絞り成形すること
で、軸との嵌着固定を行うと共に当該軸に嵌合される別
部材との胴当りとなる円環状平面を形成するようにして
いる。A shaft fixing structure according to the present invention comprises a narrowed portion which is convex on the shaft upright side around a plate-like member around which the shaft is fitted and fixed, and the leading end of the narrowed portion is provided. An annular flat surface is formed, and the flat surface forms a contact with another member fitted to the shaft, and the surface of the upright fixed coupling portion of the shaft is circumferentially equidistant and concentric with the shaft center. A groove having a concavo-convex shape or a non-circular portion together with a concentric portion with respect to the axis and a groove substantially concentric with the axis is formed. In particular, the fastening means integrally holds an impeller of a thin axial fan. It is used as a fastening means between the rotor and the rotor shaft, and the fastening fitting means drills a small hole having a diameter smaller than the shaft diameter at the shaft fitting portion of the plate-shaped member and fits the shaft fitting part. Forming a narrowed portion that is convex in the upright direction of the shaft with the center as the center, and inserting the shaft into the small hole so that the narrowed portion tip is a plate-like member plane. By reverse drawing to row, and so as to form a cylinder per become annular planar with another member fitted to the shaft performs a force-fit with the shaft.

【０００８】上述の如き構成とすることにより、薄型構
造を維持するだけでなく、当該軸に嵌合される軸受等の
併用部材との当接・胴当たり構成の簡素化を実現でき
る。With the above-described structure, not only the thin structure can be maintained, but also the structure of abutting and contacting with a joint member such as a bearing fitted to the shaft can be simplified.

【０００７】[0007]

【発明の実施の形態】図１は本発明に成る薄型軸流ファ
ンの例の断面略図で、図２は該例の回転部の断面図であ
る。FIG. 1 is a schematic sectional view of an example of a thin axial flow fan according to the present invention, and FIG. 2 is a sectional view of a rotating portion of the example.

【０００８】図１に示す薄型軸流ファンは、アキシャル
ギャップ型駆動モータを使用した一例で、鋼板で打ち抜
き形成され回転子と一体を成す羽根車６には、回転子ヨ
ークを形成する基板部６―１に永久磁石７が固着され、
該基板部６ー１に回転子軸５が固着され、該回転子軸５
は固定子ヨーク１の設けられた軸受箱３に装着された軸
受４により回転自在に軸支され、固定子ヨーク１に固着
され前記回転子の永久磁石７に小空隙を介して対向する
固定子巻線２への通電により駆動されることは従前公知
の構成であって、回転子ヨークを形成する基板部６―１
の中央に締結固着される回転子軸５との固着構造に特徴
を備えるものである。The thin axial flow fan shown in FIG. 1 is an example using an axial gap type driving motor. An impeller 6 which is formed by punching out a steel plate and is integral with a rotor has a substrate portion 6 which forms a rotor yoke. -1, the permanent magnet 7 is fixed,
The rotor shaft 5 is fixed to the substrate part 6-1.
Is rotatably supported by a bearing 4 mounted on a bearing box 3 provided with a stator yoke 1, and is fixed to the stator yoke 1 and faces a permanent magnet 7 of the rotor via a small gap. Driving by energization of the winding 2 is a conventionally known configuration, and the substrate 6-1 forming the rotor yoke is driven.
Is characterized in that it is fixed to a rotor shaft 5 which is fastened and fixed at the center of the rotor.

【０００９】[0009]

【実施例】図２は締結部の構成として、基板部６ー１の
中央の軸直立側に設けられた絞込部６―１１の形状が円
錐状を成す例で、その形成手順の例を図３〜図８に示し
ている。図３において、板状素材外周縁に所定数の羽根
６が打ち抜き形成された基板部６―１の中央には、軸直
立側に円錐状の絞込部６―１１が形成され、図４に示す
ように、該円錐状絞込部６―１１の中心に軸挿通用小孔
６―１２が穿設される。そして図５及びその締結部拡大
図図６に示すように、該軸挿通用小孔６―１２に回転子
軸５の先端を挿通嵌着し、前記円錐状の絞込部６―１１
の先端を平面６―１３とする様に逆絞り加工を行う。図
７及びその締結部拡大図図８に示すように該絞込部６ー
１１の先端を逆絞り加工により形成された平面６―１３
は、これに当接する軸受４等の別部材との摺接部として
形成されるが、この逆絞り加工で、コーキングもしくは
カシメ作業と同じように、板状部材の肉を軸表面に食い
つかせることで固着締結力を得ることになる。該例で
は、軸方向締結保持力を上げる手段として当該回転子軸
５に溝５―１を形成しているが、溝５―１の有無は所望
強度を考慮して無くてもよい。FIG. 2 shows an example in which the shape of a narrowing portion 6-11 provided at the center of the substrate portion 6-1 on the upright shaft side has a conical shape. This is shown in FIGS. In FIG. 3, a conical narrowing portion 6-11 is formed in the center of the substrate portion 6-1 in which a predetermined number of blades 6 are punched and formed on the outer peripheral edge of the plate-shaped material, and the conical narrowing portion 6-11 is formed on the shaft upright side. As shown, a shaft insertion small hole 6-12 is formed at the center of the conical narrowing portion 6-11. As shown in FIG. 5 and an enlarged view of the fastening portion thereof, the tip of the rotor shaft 5 is inserted and fitted into the small shaft insertion hole 6-12, and the conical narrowing portion 6-11 is inserted.
Reverse drawing is performed so that the tip of the flat surface becomes a plane 6-13. As shown in FIG. 7 and an enlarged view of the fastening portion thereof, a flat surface 6-13 formed by reverse drawing the tip of the narrowed portion 6-11 as shown in FIG.
Is formed as a sliding contact portion with another member such as the bearing 4 which comes into contact with this, and in this reverse drawing, the flesh of the plate-like member is eroded on the shaft surface in the same manner as in caulking or caulking work. Thus, the fastening force is obtained. In this example, the groove 5-1 is formed in the rotor shaft 5 as a means for increasing the axial fastening holding force, but the presence or absence of the groove 5-1 may not be taken into consideration in consideration of the desired strength.

【００１０】上述の例では、絞込部６―１１の形状を円
錐状としたがこの形状が任意であること、又、絞込部６
―１１の形成と軸挿通用の小孔６―１２の穿設とが順不
同であつてもよいことは言うまでもない。In the above-described example, the shape of the narrowing portion 6-11 is conical, but this shape is arbitrary.
Needless to say, the formation of the shaft 11 and the formation of the shaft insertion small holes 6-12 may be performed in any order.

【００１１】さらに、回転子軸の構成として、上述例で
は、その表面に何の構成も付与していないものとして図
象を示しているが、円周方向の締結力確保手段として、
軸外周面と同心で円周方向に形成された凹凸形状を有
し、あるいは平滑外周面とともに非円形部を有する構成
も選択任意である。Further, in the above example, the rotor shaft is illustrated as having no structure on its surface. However, as a fastening force securing means in the circumferential direction,
A configuration having a concavo-convex shape formed in the circumferential direction concentrically with the shaft outer peripheral surface, or having a non-circular portion together with the smooth outer peripheral surface is also optional.

【００１２】[0012]

【発明の効果】本発明に成る軸の固定構造とその形成方
法は、薄型構造を維持するだけでなく、当該軸に嵌合さ
れる軸受等の併用部材との当接・胴当たり構成の簡素化
を実現できる。The structure for fixing a shaft and the method of forming the shaft according to the present invention not only maintain a thin structure, but also simplify the structure of abutment and contact with a joint member such as a bearing fitted to the shaft. Can be realized.

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

【図１】本発明に成る薄型軸流ファンの例の断面略図で
ある。FIG. 1 is a schematic sectional view of an example of a thin axial fan according to the present invention.

【図２】図１の例のプロペラ回転体の断面略図である。FIG. 2 is a schematic sectional view of the propeller rotating body of the example of FIG. 1;

【図３】図１の例の絞込部を形成した状態の説明図であ
る。FIG. 3 is an explanatory diagram of a state in which a narrowed portion in the example of FIG. 1 is formed.

【図４】図３の例に小孔を穿設した状態の説明図であ
る。FIG. 4 is an explanatory view showing a state where small holes are formed in the example of FIG. 3;

【図５】図４の例に軸を挿通した状態の説明図である。FIG. 5 is an explanatory diagram of a state where a shaft is inserted through the example of FIG. 4;

【図６】図５の例の締結部拡大断面図である。FIG. 6 is an enlarged sectional view of a fastening portion of the example of FIG.

【図７】図５の例で絞込部を逆絞り加工し軸を固着し、
絞込部先端を平坦とした状態を示す説明図である。FIG. 7 shows an example shown in FIG.
It is explanatory drawing which shows the state which flattened the narrowing part front-end | tip.

【図８】図７の例の締結部拡大断面図である。FIG. 8 is an enlarged sectional view of a fastening portion of the example of FIG. 7;

【図９】従来技術に成るラジアルギャップ型軸流ファン
の例での、プロペラ回転体の断面図である。FIG. 9 is a cross-sectional view of a propeller rotating body in an example of a conventional radial gap type axial fan.

【図１０】従来技術に成るアキシャルギャップ型軸流フ
ァンの例での、プロペラ回転体の断面図である。FIG. 10 is a cross-sectional view of a propeller rotating body in an example of an axial gap type axial fan according to the related art.

【符号の説明】[Explanation of symbols]

１ 固定子ヨーク ２ 固定子巻線 ３ 軸受箱 ４ 軸受 ５ 回転子軸 ５―１ 回転子軸の溝 ６ 羽根車 ６―１ 基板部 ６―１１ 絞込部 ６―１２ 軸を相通する小孔 ６―１３ 先端平面部 ６―１４ 小径円筒部 ７ 永久磁石 DESCRIPTION OF SYMBOLS 1 Stator yoke 2 Stator winding 3 Bearing box 4 Bearing 5 Rotor shaft 5-1 Rotor shaft groove 6 Impeller 6-1 Substrate unit 6-11 Restriction unit 6-12 Small hole through which shaft passes 6 -13 Flat end part 6-14 Small cylindrical part 7 Permanent magnet

───────────────────────────────────────────────────── フロントページの続き (72)発明者 丹野 太郎 茨城県那珂郡瓜連町瓜連433−２番地 日 本サーボ株式会社瓜連工場内 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Taro Tanno 433-2 Ururen, Uraya-cho, Naka-gun, Ibaraki Pref.

Claims (7)

【特許請求の範囲】[Claims] 【請求項１】 板状部材に軸部材を直立固定する構造に
おいて、前記板状部材の軸を嵌着固定する部位の周囲に
軸直立側に凸の絞込部を備え、該絞込部が前記軸に嵌合
される別部材との胴当りを形成していること、を特徴と
する軸の固定構造。1. A structure for fixing a shaft member upright to a plate-like member, comprising: a narrowing portion protruding toward the shaft upright around a portion of the plate-like member to which the shaft is fitted and fixed; A shaft fixing structure, wherein a body contact with another member fitted to the shaft is formed. 【請求項２】 前記絞込部先端が円環状平面を成し、該
平面が、前記軸に嵌合される別部材との胴当りを形成し
ていること、を特徴とする請求項１に記載の軸の固定構
造。2. The method according to claim 1, wherein the narrowed portion has an annular flat surface, and the flat surface forms a contact with another member fitted to the shaft. The described shaft fixing structure. 【請求項３】 前記軸の直立固定結合部表面が、軸心に
対し同心で円周方向に等配の凹凸形状を有すること、を
特徴とする請求項１，２に記載の軸の固定構造。3. The shaft fixing structure according to claim 1, wherein the surface of the upright fixed coupling portion of the shaft has concavo-convex shapes which are concentric with the shaft center and are equidistantly arranged in the circumferential direction. . 【請求項４】 前記軸の直立固定結合部表面が、軸心に
対し同心円部と共に非円形部を有すること、を特徴とす
る請求項１，２に記載の軸の固定構造。4. The shaft fixing structure according to claim 1, wherein the surface of the shaft fixed connecting portion has a non-circular portion as well as a concentric portion with respect to the axis. 【請求項５】 前記軸の直立固定結合部に、軸心に対し
ほぼ同心を成す溝が形成されていること、を特徴とする
請求項１〜４に記載の軸の固定構造。5. The shaft fixing structure according to claim 1, wherein a groove substantially concentric with the shaft center is formed in the upright fixed coupling portion of the shaft. 【請求項６】 前記軸の固定構造が、薄型軸流ファンの
羽根車を一体的に保持する回転子と回転子軸との締結手
段であること、を特徴とする請求項１〜５に記載の軸の
固定構造。6. The shaft fixing structure according to claim 1, wherein the shaft fixing structure is a means for fastening a rotor and a rotor shaft which integrally hold an impeller of a thin axial fan. The fixed structure of the shaft. 【請求項７】 板状部材の軸嵌着部位に、該軸嵌着部位
を中心として当該軸の直立方向に凸の絞込部を形成する
と共に小孔を穿設し、該小孔に軸を貫挿し前記絞込部先
端を板状部材平面と並行するように逆絞り成形すること
で、軸との嵌着固定を行うと共に当該軸に嵌合される別
部材との胴当りとなる円環状平面を形成するようにした
こと、を特徴とする軸の固定方法。7. A narrowed portion is formed in a shaft fitting portion of a plate-like member in a direction perpendicular to the shaft centering on the shaft fitting portion, and a small hole is formed in the small hole. By performing reverse drawing so that the tip of the narrowed portion is parallel to the plane of the plate-like member, thereby fixing the fitting to the shaft and forming a circle that comes into contact with another member fitted to the shaft. A method of fixing a shaft, wherein an annular plane is formed.