JP3713856B2 - Spindle motor and manufacturing method thereof - Google Patents

Spindle motor and manufacturing method thereof Download PDF

Info

Publication number
JP3713856B2
JP3713856B2 JP33581096A JP33581096A JP3713856B2 JP 3713856 B2 JP3713856 B2 JP 3713856B2 JP 33581096 A JP33581096 A JP 33581096A JP 33581096 A JP33581096 A JP 33581096A JP 3713856 B2 JP3713856 B2 JP 3713856B2
Authority
JP
Japan
Prior art keywords
shaft member
bearing
hub
spindle motor
fixed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP33581096A
Other languages
Japanese (ja)
Other versions
JPH10174348A (en
Inventor
知行 田代
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP33581096A priority Critical patent/JP3713856B2/en
Publication of JPH10174348A publication Critical patent/JPH10174348A/en
Application granted granted Critical
Publication of JP3713856B2 publication Critical patent/JP3713856B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Description

【０００１】
【発明の属する技術分野】
本発明は磁気ディスク型記憶装置などに用いられるスピンドルモータの改良に関する。
【０００２】
【従来の技術】
図７は従来の磁気ディスク型記憶装置のスピンドルモータの側面図である。
従来の磁気ディスク型記憶装置に用いられるスピンドルモータ１００は、例えば、ベース部１１０と、このベース部１１０に回転自在に取付けたロータ部１２０とからなる。
ベース部１１０は、矩形のベース部材１１１と、このベース部材１１１に固定した軸部材１１２と、この軸部材１１２に取付けた一対のベアリング１１３，１１４と、ベース部材１１１に取付けた複数の固定子１１５…（…は複数を示す。以下同じ。）とからなる。
【０００３】
ベース部材１１１は、ロータ部１２０の高さの基準となる基準面１１１ａと、軸部材１１２を挿入固定する嵌合孔１１１ｂと、この嵌合孔１１１ｂの上部端面に設けた凸部１１１ｃと、固定子１１５を収納する凹部１１１ｄとからなる。
軸部材１１２は、ベース部材１１１に挿入固定する固定部１１２ａと、この固定部１１２ａから延ばしたベアリング１１３の内輪１１３ａ及びベアリング１１４の内輪１１４ａを嵌合する嵌合部１１２ｃとからなる。
固定子１１５は、ベース部材１１１の凹部１１１ｄに取付けたコア１１５ａと、このコア１１５ａに巻いた駆動コイル１１５ｂとからなる。なお、１１７は駆動コイル１１５ｂの引出し線、１１８，１１８は駆動コイル１１５ｂのコネクタを示す。
【０００４】
ロータ部１２０は、軸部材１１２に対して一対のベアリング１１３，１１４の外輪１１３ｂ，１１４ｂで回転自在に支持されたハブ１２１と、このハブ１２１の外周下面に取付けたロータヨーク１２２と、このロータヨーク１２２の内周に取付けた磁極マグネット１２３…と、図面上部のハブ１２１の上端内周に取付けたカバー１２５とからなる。
【０００５】
ハブ１２１は、軸部材１１２の軸方向の高さ基準となるフランジ面１２１ａと、このフランジ面１２１ａから延ばした円筒部１２１ｂと、この円筒部１２１ｂの内周下部に設けたベアリング１１３の当接面１２１ｃと、この当接面１２１ｃの上部に設けたベアリング受け面１２１ｄと、このベアリング受け面１２１ｄの上部に設けた段差部１２１ｅと、フランジ面１２１ａの下面に設けたロータヨーク１２２の取付け部１２１ｆとからなる。
１２８は、ハブ１２１とカバー１２５とに付けた接着剤である。
【０００６】
図８（ａ）〜（ｅ）は、従来の磁気ディスク型記憶装置のスピンドルモータの組立手順の一例を示す説明図である。
（ａ）は、ベース部１１０を示し、ベース部材１１１に固定子１１５…及びコネクタ１１８，１１８を取付け済みの姿を示す。
（ｂ）において、ベース部材１１１の嵌合孔１１１ｂに軸部材１１２の固定部１１２ａを挿入固定する。
【０００７】
（ｃ）において、ロータヨーク１２２及びマグネット１２３…を取付け済のハブ１２１にベアリング１１３の外輪１１３ｂ及びベアリング１１４の外輪１１４ｂを嵌合させる。
（ｄ）において、（ｂ）の工程にて組立たベース部材１１１の凸部１１１ｃにベアリング１１３の内輪１１３ａの外端面を当接させてベアリング１１３を軸部材１１２の嵌合部１１２ｃに挿入固定するとともにベアリング１１４を軸部材１１２の嵌合部１１２ｃに挿入固定する。
（ｅ）において、ハブ１２１の段差部１２１ｅにカバー１２５下面を当てハブ１２１の上面とカバー１２５の上面とに接着剤１２８を塗布して組立を完了する。
【０００８】
【発明が解決しようとする課題】
しかし、ベース部材１１１の基準面１１１ａとハブ１２１のフランジ面１２１ａとの寸法Ｈ１は、ベース部１１１、ベアリング１１３及びハブ１２１の各部品の加工誤差や組立誤差の累積となり、完成したスピンドルモータ１００が所定の寸法精度が得られない場合に、組立後、ハブ１２１のフランジ面１２１ａを特別の加工機械で仕上げることで、所定の寸法Ｈ１にする必要があった。
組立後の加工でスピンドルモータ１００の内部に切り粉が入り込み、これをクリーンエアブロー等で洗浄するために多くの工数が必要であり、コスト高の原因でもあった。
また、組立後の加工でフランジ面１２１ａの平面度を悪化させてしまうという問題もあった。
【０００９】
そこで、本発明の目的は、組立後の加工を必要としないスピンドルモータを提供することにある。
【００１０】
【課題を解決するための手段】
上記課題を解決するために請求項１は、嵌合孔を有するベース部材と、嵌合孔に挿嵌して固定された軸部材と、軸部材に内輪を固定された第１及び第２のベアリングと、１及び第２のベアリングの外輪に支持され軸部材に対して回転自在とされたハブと、を備えたスピンドルモータにおいて、軸部材に、第１のベアリングの内輪と嵌合してこれを固定する嵌合部と、この嵌合部から外側に向かって立ち上がる基準段部とを設け、第１のベアリングの内輪における第２のベアリングと対向しない端面を基準段部に当接させる共に、第１のベアリングの外輪における第２ベアリングと対向する端面をハブと当接させる構成にして成ることを特徴とする。
【００１１】
軸部材に形成した基準段部に予め一対のベアリング及びマグネットを装着したハブを組立て、この組立済の軸部材をベース部材に軸方向の高さ調整をしつつ固定することができる。
軸部材の基準段部に予め一対のベアリング及びマグネットを装着したハブを組立てることができ、この組立済の軸部材をベース部材に軸方向の高さ調整をしつつ固定することができるので、組立後の加工は不要となる。従って、組立工数を大幅に低減することができ、精度のよいスピンドルモータを提供することができる。
【００１２】
請求項２は、軸方向の高さの基準となる基準面と嵌合孔とを有するベース部材と、嵌合孔に挿嵌して固定された軸部材と、軸部材に内輪を固定された第１及び第２のベアリングと、軸方向の高さの基準となるフランジ面を有し、１及び第２のベアリングの外輪に支持され軸部材に対して回転自在とされたハブと、を備え、基準面とフランジ面との軸方向距離が所定距離となるようベース部材に対してハブを配置して成るスピンドルモータを製造する、スピンドルモータの製造方法において、軸部材に、第１のベアリングの内輪と嵌合してこれを固定する嵌合部と、この嵌合部から外側に向かって立ち上がる基準段部とを備えており、第１及び第２のベアリングの内輪を軸部材に固定する際に、第１のベアリングの内輪における第２のベアリングと対向しない端面を基準段部に当接させて固定する一方、第１のベアリングの外輪における第２のベアリングと対向する端面をハブと当接させて、軸部材と第１及び第２のベアリングとハブとを一体化したハブ組立体を組み立てる行程と、ハブ組立体の軸部材を嵌合孔に挿入し、基準面とフランジ面との軸方向距離が所定距離となるよう軸部材の嵌合孔に対する軸方向の挿入位置を調整する行程と、を有することを特徴とする。
【００１３】
軸部材の基準段部に予めハブを組立て、この組立済の軸部材をベース部材に軸方向の高さ調整をしつつ固定するので、組立後の加工をする必要がない。この結果、組立工数を大幅に低減することができる。
【００１４】
【発明の実施の形態】
本発明の実施の形態を添付図に基づいて以下に説明する。
図１は本発明に係る磁気ディスク型記憶装置のスピンドルモータ（第１実施例）の平面図である。
磁気ディスク型記憶装置のスピンドルモータ１は、ベース部１０と、このベース部１０に回転自在に取付けたロータ部２０とからなる。
【００１５】
図２は図１の２−２線断面図であり、本発明に係る磁気ディスク型記憶装置のスピンドルモータ１（第１実施例）の側面図を示す。
ベース部１０は、矩形のベース部材１１と、このベース部材１１に固定した軸部材１２と、この軸部材１２に取付けた一対のベアリング１３，１４と、ベース部材１１に取付けた複数の固定子１５…とからなる。
【００１６】
ベース部材１１は、ロータ部２０の軸方向の高さの基準面１１ａと、軸部材１２を挿入固定する嵌合孔１１ｂと、固定子１５…を収納する凹部１１ｄとからなる。
軸部材１２は、ベース部材１１に挿入固定する固定部１２ａと、この固定部１２ａの上部に設けたベアリング１３の内輪１３ａの外端面が当接する基準段部１２ｂと、この基準段部１２ｂから延ばしたベアリング１４の内輪１４ａを嵌合する嵌合部１２ｃとからなる。また、軸部材１２は磁性体にて構成したものである。
固定子１５は、ベース部材１１の凹部１１ｄに取付けたコア１５ａと、このコア１５ａに巻いた駆動コイル１５ｂとからなる。なお、１７は駆動コイル１５ｂの引出し線、１８，１８は駆動コイル１５ｂのコネクタを示す。
【００１７】
ロータ部２０は、軸部材１２に対して一対のベアリング１３，１４の外輪１３ｂ，１４ｂで回転自在に支持されたハブ２１と、このハブ２１の外周下面に取付けたロータヨーク２２と、このロータヨーク２２の内周に取付けた磁極マグネット２３…と、図面上部のハブ２１の上端内周に取付けた磁性シール部材２４と、この磁性シール部材２４を覆うカバー２５とからなる。
【００１８】
ハブ２１は、軸部材１２の軸方向の高さ基準となるフランジ面２１ａと、このフランジ面２１ａから延ばした円筒部２１ｂと、この円筒部２１ｂの内周下部に設けたベアリング１３の当接面２１ｃと、この当接面２１ｃの上部に設けたベアリング１４の受け面２１ｄと、この受け面２１ｄの上部に設けた段差部２１ｅと、フランジ面２１ａの下面に設けたロータヨーク２２の取付け部２１ｆとからなる。
磁性シール部材２４は、リング状のマグネット２４ａと、このマグネット２４ａの両面を覆う一対の磁性体のプレート２４ｂ，２４ｃとからなる。
２７は、軸部材１２と磁性シール部材２４との間に付けた磁性流体を示し、２８は、ハブ２１とカバー２５とに付けた接着剤である。
【００１９】
以上述べた磁気ディスク型記憶装置のスピンドルモータ１の作用を次に説明する。
図３（ａ）〜（ｃ）は本発明に係る磁気ディスク型記憶装置のスピンドルモータ（第１実施例）の第１作用説明図である。
（ａ）において、軸部材１２にベアリング１３、ロータヨーク２２及びマグネット２３付きのハブ２１、ベアリング１４、磁性シール部材２４、カバー２５の順で各部品を予め組込み、ハブ２１とカバー２５とを接着剤２８で固定したものを用意する。軸部材１２にベアリング１３を挿入する際、軸部材１２の基準段部１２ｂにベアリング１３の内輪１３ａの外端面を当接させ固定する。
一方、ベース部材１１に固定子１５…及びコネクタ１８，１８を予め組込んだものを用意する。
【００２０】
（ｂ）において、組込み済のベース部材１１の嵌合孔１１ｂに、組込み済の軸部材１２の固定部１２ａを矢印１の如く挿入する。
（ｃ）において、位置合せ治具Ａをベース部材１１の基準面１１ａとハブ２１のフランジ面２１ａとの間に掛け渡し、昇降治具Ｂで軸部材１２の下部を保持し、基準面１１ａからフランジ面２１ａまでの寸法を規定寸法Ｈ２にしてベース部材１１に軸部材１２を接着固定する。
すなわち、軸部材１２の基準段部１２ｂに予めハブ２１を組立て、この組立済の軸部材１２をベース部材１１に軸方向の高さ調整をしつつ固定するので、組立後の加工をする必要がない。
【００２１】
図４は本発明に係る磁気ディスク型記憶装置のスピンドルモータ（第１実施例）の第２作用説明図であり、磁性流体シールの作用を示す。
軸部材１２を磁性体で構成し、磁性シール部材２４をリング状のマグネット２４ａと、このマグネット２４ａの両面を覆う一対の磁性体のプレート２４ｂ，２４ｃとから構成したので、矢印２の如く磁気回路を構成する。
従って、磁性流体２７は、磁気シール部材２４の内周と軸部材１２の外周とから流れ出すことはなく、磁気シール部材２４の内周と軸部材１２の外周との間を確実にシールすることができる。
【００２２】
図５は本発明に係る磁気ディスク型記憶装置のスピンドルモータ（第２実施例）の断面図を示す。
磁気ディスク型記憶装置のスピンドルモータ３０は、ベース部１０と、このベース部１０に回転自在に取付けたロータ部４０とからなる。
ベース部１０は、第１実施例で示した磁気ディスク型記憶装置のスピンドルモータ１と同一部品であり、すなわち、１１は矩形のベース部材、１１ａは基準面、１１ｂは嵌合孔、１１ｄは凹部、１２は軸部材、１２ａは固定部、１２ｂは基準段部、１２ｃは嵌合部、１３，１４はベアリング、１３ａ，１４ａは内輪、１５は固定子、１５ａはコア、１５ｂは駆動コイル、１７は引出し線、１８，１８はコネクタである。
【００２３】
ロータ部４０は、軸部材１２に対して一対のベアリング１３，１４の外輪１３ｂ，１４ｂで回転自在に支持されたハブ４１と、このハブ４１の外周下面に取付けたロータヨーク４２と、このロータヨーク４２の内周に取付けた磁極マグネット４３…と、図面上部のハブ４１の上端内周に取付けたカバー４５とからなる。
なお、４１ａはハブ４１のフランジ面、４１ｂは円筒部、４１ｃは当接面、４１ｄは受け面、４１ｅは段差部、４１ｆは取付け部、４８はハブ４１とカバー４５とに付けた接着剤である。
すなわち、第２実施例は、第１実施例に示した磁性シール部材２４及びカバー２５をシールカバー４５に置き換えたもので、磁気シールからダストシールに変更した例を示す。
【００２４】
図６は本発明に係る磁気ディスク型記憶装置のスピンドルモータ（第３実施例）の断面図を示す。
磁気ディスク型記憶装置のスピンドルモータ５０は、ベース部６０と、このベース部６０に回転自在に取付けたロータ部２０とからなる。
ベース部６０は、矩形のベース部材６１と、このベース部材６１に固定した軸部材６２と、この軸部材６２に取付けた一対のベアリング６３，６４と、ベース部材１１に取付けた複数の固定子６５…とからなる。
【００２５】
ベース部材６１は、ロータ部２０の軸方向の高さの基準面６１ａと、軸部材６２を挿入固定する嵌合孔６１ｂと、固定子６５…を収納する凹部６１ｄとからなる。
軸部材６２は、ベース部材６１に挿入固定する固定部６２ａと、この固定部６２ａの上部に設けたベアリング６３の内輪６３ａの外端面が当接する基準段部６２ｂと、固定部６２ａに連続しベアリング６４の内輪６４ａを嵌合する嵌合部６２ｃとからなる。また、軸部材６２は磁性体にて構成したものである。
【００２６】
固定子６５は、ベース部材６１の凹部６１ｄに取付けたコア６５ａと、このコア６５ａに巻いた駆動コイル６５ｂとからなる。なお、６３ｂはベアルング６３の外輪、６４ｂはベアルング６４の外輪、６７は駆動コイル６５ｂの引出し線、６８，６８は駆動コイル６５ｂのコネクタを示す。
なお、第１実施例で示したロータ部２０と同一部品については符号を流用し詳細な説明は省略する。
すなわち、第３実施例は、第１実施例に示した軸部材１２（図２参照）を変更したもので、軸部材６２の基準段部６２ｂを上部に変更した例を示す。従って、第１実施例のベアリング１３，１４（図２参照）を使用する場合は、軸部材６２の外径に嵌合する磁気シール部材２４及びカバー２５（図２参照）の内径は第１実施例で示した磁気シール部材２４及びカバー２５よりも大きいものとする。
【００２７】
尚、本発明のスピンドルモータの用途は、実施例では磁気ディスク型記憶装置用としたが、これに限るものではなく、例えば、一般の回転機器に適用してもよい。
【００２８】
【発明の効果】
本発明は上記構成により次の効果を発揮する。
請求項１は、軸部材に、第１のベアリングの内輪と嵌合してこれを固定する嵌合部と、この嵌合部から外側に向かって立ち上がる基準段部とを設け、第１のベアリングの内輪における第２のベアリングと対向しない端面を基準段部に当接させる共に、第１のベアリングの外輪における第２ベアリングと対向する端面をハブと当接させる構成とした。
軸部材の基準段部に予め一対のベアリング及びマグネットを装着したハブを組立てることができ、この組立済の軸部材をベース部材に軸方向の高さ調整をしつつ固定することができるので、組立後の加工は不要となる。従って、組立工数を大幅に低減することができ、精度のよいスピンドルモータを提供することができる。
【００２９】
請求項２は、軸部材に、第１のベアリングの内輪と嵌合してこれを固定する嵌合部と、この嵌合部から外側に向かって立ち上がる基準段部とを備えており、第１及び第２のベアリングの内輪を軸部材に固定する際に、第１のベアリングの内輪における第２のベアリングと対向しない端面を基準段部に当接させて固定する一方、第１のベアリングの外輪における第２のベアリングと対向する端面をハブと当接させて、軸部材と第１及び第２のベアリングとハブとを一体化したハブ組立体を組み立てる行程と、ハブ組立体の軸部材を嵌合孔に挿入し、基準面とフランジ面との軸方向距離が所定距離となるよう軸部材の嵌合孔に対する軸方向の挿入位置を調整する行程と、を有するものなので、軸部材の基準段部に予めハブを組立て、この組立済の軸部材をベース部材に軸方向の高さ調整をしつつ固定することができる。これにより、組立後の加工をする必要がない。この結果、組立工数を大幅に低減することができる。
【図面の簡単な説明】
【図１】 本発明に係る磁気ディスク型記憶装置のスピンドルモータ（第１実施例）の平面図
【図２】 図１の２−２線断面図
【図３】 本発明に係る磁気ディスク型記憶装置のスピンドルモータ（第１実施例）の第１作用説明図
【図４】 本発明に係る磁気ディスク型記憶装置のスピンドルモータ（第１実施例）の第２作用説明図
【図５】 本発明に係る磁気ディスク型記憶装置のスピンドルモータ（第２実施例）の断面図
【図６】 本発明に係る磁気ディスク型記憶装置のスピンドルモータ（第３実施例）の断面図
【図７】 従来の磁気ディスク型記憶装置のスピンドルモータの側面図
【図８】 従来の磁気ディスク型記憶装置のスピンドルモータの組立手順の一例を示す説明図
【符号の説明】
１，３０，５０…スピンドルモータ、１１，６１…ベース部材、１２，６２…軸部材、１２ｂ，６２ｂ…基準段部、１３，１４，６３，６４…ベアリング、１３ａ，１４ａ，６３ａ，６４ａ…内輪、１５，６５…固定子、２１，４１…ハブ、２３，４３…マグネット（磁極マグネット）。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a spindle motor used in a magnetic disk type storage device or the like.
[0002]
[Prior art]
FIG. 7 is a side view of a spindle motor of a conventional magnetic disk type storage device.
A spindle motor 100 used in a conventional magnetic disk type storage device includes, for example, a base portion 110 and a rotor portion 120 that is rotatably attached to the base portion 110.
The base portion 110 includes a rectangular base member 111, a shaft member 112 fixed to the base member 111, a pair of bearings 113 and 114 attached to the shaft member 112, and a plurality of stators 115 attached to the base member 111. (... indicates a plurality. The same shall apply hereinafter).
[0003]
The base member 111 includes a reference surface 111a serving as a reference for the height of the rotor portion 120, a fitting hole 111b for inserting and fixing the shaft member 112, and a convex portion 111c provided on the upper end surface of the fitting hole 111b. It comprises a recess 111d for accommodating the child 115.
The shaft member 112 includes a fixing portion 112a that is inserted and fixed to the base member 111, and a fitting portion 112c that fits the inner ring 113a of the bearing 113 and the inner ring 114a of the bearing 114 that extend from the fixing portion 112a.
The stator 115 includes a core 115a attached to the recess 111d of the base member 111, and a drive coil 115b wound around the core 115a. Reference numeral 117 denotes a lead wire of the drive coil 115b, and 118 and 118 denote connectors of the drive coil 115b.
[0004]
The rotor portion 120 includes a hub 121 rotatably supported by outer shafts 113b and 114b of a pair of bearings 113 and 114 with respect to the shaft member 112, a rotor yoke 122 attached to the outer peripheral lower surface of the hub 121, and the rotor yoke 122 The magnetic pole magnet 123 is attached to the inner periphery, and the cover 125 is attached to the inner periphery of the upper end of the hub 121 at the top of the drawing.
[0005]
The hub 121 includes a flange surface 121a that serves as a reference for the axial height of the shaft member 112, a cylindrical portion 121b that extends from the flange surface 121a, and a contact surface of a bearing 113 that is provided at the inner peripheral lower portion of the cylindrical portion 121b. 121c, a bearing receiving surface 121d provided above the contact surface 121c, a stepped portion 121e provided above the bearing receiving surface 121d, and a mounting portion 121f of the rotor yoke 122 provided on the lower surface of the flange surface 121a. Become.
Reference numeral 128 denotes an adhesive attached to the hub 121 and the cover 125.
[0006]
8A to 8E are explanatory views showing an example of the assembly procedure of the spindle motor of the conventional magnetic disk type storage device.
(A) shows the base part 110 and shows the base member 111 with the stators 115 and the connectors 118, 118 already attached.
In (b), the fixing portion 112 a of the shaft member 112 is inserted and fixed in the fitting hole 111 b of the base member 111.
[0007]
5C, the outer ring 113b of the bearing 113 and the outer ring 114b of the bearing 114 are fitted to the hub 121 to which the rotor yoke 122 and the magnets 123 are already attached.
In (d), the outer end surface of the inner ring 113a of the bearing 113 is brought into contact with the convex portion 111c of the base member 111 assembled in the step (b), and the bearing 113 is inserted into and fixed to the fitting portion 112c of the shaft member 112. At the same time, the bearing 114 is inserted and fixed to the fitting portion 112 c of the shaft member 112.
In (e), the lower surface of the cover 125 is applied to the stepped portion 121e of the hub 121, and the adhesive 128 is applied to the upper surface of the hub 121 and the upper surface of the cover 125 to complete the assembly.
[0008]
[Problems to be solved by the invention]
However, the dimension H1 between the reference surface 111a of the base member 111 and the flange surface 121a of the hub 121 is an accumulation of processing errors and assembly errors of the parts of the base portion 111, the bearing 113, and the hub 121, and the completed spindle motor 100 When the predetermined dimensional accuracy cannot be obtained, it is necessary to finish the flange surface 121a of the hub 121 with a special processing machine after assembly, so that the predetermined dimension H1 is obtained.
In the post-assembly processing, chips enter the spindle motor 100, and many man-hours are required to clean it with a clean air blow or the like, resulting in high costs.
There is also a problem that the flatness of the flange surface 121a is deteriorated by the processing after assembly.
[0009]
Accordingly, an object of the present invention is to provide a spindle motor that does not require processing after assembly.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a first aspect of the present invention provides a base member having a fitting hole, a shaft member inserted and fixed in the fitting hole, and first and second shafts having an inner ring fixed to the shaft member . In a spindle motor comprising a bearing and a hub supported by outer rings of the first and second bearings and rotatable relative to the shaft member, the shaft member is fitted with the inner ring of the first bearing. And a reference step portion that rises outward from the fitting portion, and an end surface of the inner ring of the first bearing that does not face the second bearing is brought into contact with the reference step portion, An end face of the outer ring of the first bearing facing the second bearing is configured to abut against the hub.
[0011]
A hub in which a pair of bearings and magnets are mounted in advance on a reference step formed on the shaft member can be assembled, and the assembled shaft member can be fixed to the base member while adjusting the height in the axial direction.
A hub in which a pair of bearings and magnets are mounted in advance on the reference step portion of the shaft member can be assembled, and this assembled shaft member can be fixed to the base member while adjusting the height in the axial direction. No further processing is necessary. Therefore, the number of assembling steps can be greatly reduced, and an accurate spindle motor can be provided.
[0012]
According to a second aspect of the present invention, a base member having a reference surface serving as a reference for the height in the axial direction and a fitting hole, a shaft member inserted and fixed in the fitting hole, and an inner ring fixed to the shaft member A first and second bearing, and a hub having a flange surface that serves as a reference for the height in the axial direction and supported by the outer ring of the first and second bearings and rotatable relative to the shaft member. In the spindle motor manufacturing method, a spindle motor is manufactured by arranging a hub with respect to a base member so that an axial distance between a reference surface and a flange surface is a predetermined distance. When the inner ring of the first and second bearings is fixed to the shaft member, a fitting part that fits and fixes the inner ring and a reference step part that rises outward from the fitting part are provided. The second bearing in the inner ring of the first bearing The end face that is not opposed to the reference step portion is abutted and fixed, while the end face of the outer ring of the first bearing that is opposed to the second bearing is brought into contact with the hub, so that the shaft member and the first and second bearings The process of assembling the hub assembly integrating the hub and the hub, and inserting the shaft assembly shaft member into the fitting hole so that the axial distance between the reference surface and the flange surface is the predetermined distance. And a step of adjusting an axial insertion position with respect to the hole.
[0013]
Since the hub is assembled in advance to the reference step portion of the shaft member, and the assembled shaft member is fixed to the base member while adjusting the height in the axial direction, there is no need for processing after assembly. As a result, the number of assembly steps can be significantly reduced.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a plan view of a spindle motor (first embodiment) of a magnetic disk type storage device according to the present invention.
The spindle motor 1 of the magnetic disk type storage device includes a base portion 10 and a rotor portion 20 that is rotatably attached to the base portion 10.
[0015]
FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and shows a side view of the spindle motor 1 (first embodiment) of the magnetic disk type storage device according to the present invention.
The base portion 10 includes a rectangular base member 11, a shaft member 12 fixed to the base member 11, a pair of bearings 13 and 14 attached to the shaft member 12, and a plurality of stators 15 attached to the base member 11. It consists of ...
[0016]
The base member 11 includes a reference surface 11a having a height in the axial direction of the rotor portion 20, a fitting hole 11b into which the shaft member 12 is inserted and fixed, and a recess 11d in which the stators 15 are accommodated.
The shaft member 12 includes a fixed portion 12a that is inserted and fixed to the base member 11, a reference step portion 12b that contacts the outer end surface of the inner ring 13a of the bearing 13 provided on the upper portion of the fixed portion 12a, and extends from the reference step portion 12b. And a fitting portion 12c for fitting the inner ring 14a of the bearing 14. The shaft member 12 is made of a magnetic material.
The stator 15 includes a core 15a attached to the recess 11d of the base member 11, and a drive coil 15b wound around the core 15a. Reference numeral 17 denotes a lead wire of the drive coil 15b, and 18 and 18 denote connectors of the drive coil 15b.
[0017]
The rotor unit 20 includes a hub 21 rotatably supported by outer shafts 13 b and 14 b of a pair of bearings 13 and 14 with respect to the shaft member 12, a rotor yoke 22 attached to an outer peripheral lower surface of the hub 21, A magnetic pole magnet 23 attached to the inner periphery, a magnetic seal member 24 attached to the inner periphery of the upper end of the hub 21 in the upper part of the drawing, and a cover 25 covering the magnetic seal member 24.
[0018]
The hub 21 includes a flange surface 21a that serves as a height reference in the axial direction of the shaft member 12, a cylindrical portion 21b that extends from the flange surface 21a, and a contact surface of a bearing 13 that is provided at the inner peripheral lower portion of the cylindrical portion 21b. 21c, a bearing surface 21d of the bearing 14 provided on the upper surface of the contact surface 21c, a stepped portion 21e provided on the upper surface of the receiving surface 21d, and a mounting portion 21f of the rotor yoke 22 provided on the lower surface of the flange surface 21a, Consists of.
The magnetic seal member 24 includes a ring-shaped magnet 24a and a pair of magnetic plates 24b and 24c covering both surfaces of the magnet 24a.
Reference numeral 27 denotes a magnetic fluid attached between the shaft member 12 and the magnetic seal member 24, and reference numeral 28 denotes an adhesive attached to the hub 21 and the cover 25.
[0019]
Next, the operation of the spindle motor 1 of the magnetic disk type storage device described above will be described.
FIGS. 3A to 3C are first operation explanatory views of the spindle motor (first embodiment) of the magnetic disk type storage device according to the present invention.
In (a), each component is assembled in advance in the order of the bearing 13, the rotor yoke 22 and the hub 21 with the magnet 23, the bearing 14, the magnetic seal member 24, and the cover 25 in the shaft member 12, and the hub 21 and the cover 25 are bonded with an adhesive. Prepare one fixed at 28. When the bearing 13 is inserted into the shaft member 12, the outer end surface of the inner ring 13 a of the bearing 13 is brought into contact with and fixed to the reference step portion 12 b of the shaft member 12.
On the other hand, the base member 11 in which the stators 15 and the connectors 18 and 18 are assembled in advance is prepared.
[0020]
In (b), the fixing portion 12a of the assembled shaft member 12 is inserted into the fitting hole 11b of the assembled base member 11 as shown by the arrow 1.
In (c), the alignment jig A is spanned between the reference surface 11a of the base member 11 and the flange surface 21a of the hub 21, and the lower part of the shaft member 12 is held by the lifting jig B, The shaft member 12 is bonded and fixed to the base member 11 with the dimension up to the flange surface 21a being a specified dimension H2.
That is, the hub 21 is assembled in advance on the reference step portion 12b of the shaft member 12, and the assembled shaft member 12 is fixed to the base member 11 while adjusting the height in the axial direction. Absent.
[0021]
FIG. 4 is a diagram for explaining a second action of the spindle motor (first embodiment) of the magnetic disk type storage device according to the present invention, and shows the action of the magnetic fluid seal.
The shaft member 12 is composed of a magnetic material, and the magnetic seal member 24 is composed of a ring-shaped magnet 24a and a pair of magnetic plates 24b and 24c covering both surfaces of the magnet 24a. Configure.
Accordingly, the magnetic fluid 27 does not flow out from the inner periphery of the magnetic seal member 24 and the outer periphery of the shaft member 12, and can reliably seal between the inner periphery of the magnetic seal member 24 and the outer periphery of the shaft member 12. it can.
[0022]
FIG. 5 is a sectional view of a spindle motor (second embodiment) of the magnetic disk type storage device according to the present invention.
The spindle motor 30 of the magnetic disk type storage device includes a base portion 10 and a rotor portion 40 that is rotatably attached to the base portion 10.
The base portion 10 is the same component as the spindle motor 1 of the magnetic disk type storage device shown in the first embodiment, that is, 11 is a rectangular base member, 11a is a reference surface, 11b is a fitting hole, and 11d is a recess. , 12 is a shaft member, 12a is a fixed portion, 12b is a reference step portion, 12c is a fitting portion, 13 and 14 are bearings, 13a and 14a are inner rings, 15 is a stator, 15a is a core, 15b is a drive coil, 17 Is a leader line, and 18 and 18 are connectors.
[0023]
The rotor portion 40 includes a hub 41 rotatably supported by outer shafts 13b and 14b of a pair of bearings 13 and 14 with respect to the shaft member 12, a rotor yoke 42 attached to an outer peripheral lower surface of the hub 41, and the rotor yoke 42 The magnetic pole magnets 43 are attached to the inner periphery, and the cover 45 is attached to the inner periphery of the upper end of the hub 41 at the top of the drawing.
41a is a flange surface of the hub 41, 41b is a cylindrical portion, 41c is a contact surface, 41d is a receiving surface, 41e is a stepped portion, 41f is a mounting portion, and 48 is an adhesive attached to the hub 41 and the cover 45. is there.
That is, the second embodiment is an example in which the magnetic seal member 24 and the cover 25 shown in the first embodiment are replaced with a seal cover 45, and the magnetic seal is changed to a dust seal.
[0024]
FIG. 6 is a sectional view of a spindle motor (third embodiment) of the magnetic disk type storage device according to the present invention.
The spindle motor 50 of the magnetic disk type storage device includes a base portion 60 and a rotor portion 20 that is rotatably attached to the base portion 60.
The base portion 60 includes a rectangular base member 61, a shaft member 62 fixed to the base member 61, a pair of bearings 63 and 64 attached to the shaft member 62, and a plurality of stators 65 attached to the base member 11. It consists of ...
[0025]
The base member 61 includes a reference surface 61a having a height in the axial direction of the rotor portion 20, a fitting hole 61b into which the shaft member 62 is inserted and fixed, and a recess 61d in which the stators 65 are accommodated.
The shaft member 62 includes a fixed portion 62a that is inserted and fixed to the base member 61, a reference step portion 62b that contacts the outer end surface of the inner ring 63a of the bearing 63 provided on the upper portion of the fixed portion 62a, and a bearing that is continuous with the fixed portion 62a. It consists of the fitting part 62c which fits 64 inner ring | wheels 64a. The shaft member 62 is made of a magnetic material.
[0026]
The stator 65 includes a core 65a attached to the recess 61d of the base member 61, and a drive coil 65b wound around the core 65a. Reference numeral 63b denotes an outer ring of the bearing 63, 64b denotes an outer ring of the bearing 64, 67 denotes a lead wire of the drive coil 65b, and 68 and 68 denote connectors of the drive coil 65b.
In addition, about the same component as the rotor part 20 shown in 1st Example, a code | symbol is diverted and detailed description is abbreviate | omitted.
That is, the third embodiment is an example in which the shaft member 12 (see FIG. 2) shown in the first embodiment is changed, and the reference step portion 62b of the shaft member 62 is changed to the upper portion. Therefore, when the bearings 13 and 14 (see FIG. 2) of the first embodiment are used, the inner diameters of the magnetic seal member 24 and the cover 25 (see FIG. 2) fitted to the outer diameter of the shaft member 62 are the first embodiment. It is assumed that it is larger than the magnetic seal member 24 and the cover 25 shown in the example.
[0027]
The application of the spindle motor of the present invention is for a magnetic disk type storage device in the embodiment, but is not limited to this, and may be applied to, for example, a general rotating device.
[0028]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
Claim 1, the shaft member, a fitting portion for fixing it mates with the inner race of the first bearing is provided with a reference stepped portions raised outward from the fitting portion, the first bearing The end face of the inner ring that does not face the second bearing is brought into contact with the reference step portion, and the end face of the outer ring of the first bearing that faces the second bearing is brought into contact with the hub .
A hub in which a pair of bearings and magnets are mounted in advance on the reference step portion of the shaft member can be assembled, and this assembled shaft member can be fixed to the base member while adjusting the height in the axial direction. No further processing is necessary. Therefore, the number of assembling steps can be greatly reduced, and an accurate spindle motor can be provided .
[0029]
According to a second aspect of the present invention, the shaft member includes a fitting portion that fits and fixes the inner ring of the first bearing, and a reference step portion that rises outward from the fitting portion. When the inner ring of the second bearing is fixed to the shaft member, the end face of the inner ring of the first bearing that is not opposed to the second bearing is fixed to the reference step portion, while the outer ring of the first bearing is fixed. A process of assembling a hub assembly in which the shaft member, the first and second bearings, and the hub are integrated, with the end face facing the second bearing in contact with the hub, and fitting the shaft member of the hub assembly And a step of adjusting the insertion position in the axial direction with respect to the fitting hole of the shaft member so that the axial distance between the reference surface and the flange surface is a predetermined distance. Assembling the hub in advance, this assembled Member can be fixed while the height adjustment of the axial to the base member. This eliminates the need for processing after assembly. As a result, the number of assembly steps can be significantly reduced.
[Brief description of the drawings]
FIG. 1 is a plan view of a spindle motor (first embodiment) of a magnetic disk type storage device according to the present invention. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. FIG. 4 is a diagram illustrating a first operation of the spindle motor (first embodiment) of the apparatus. FIG. 4 is a diagram illustrating a second operation of the spindle motor (first embodiment) of the magnetic disk type storage device according to the present invention. FIG. 6 is a sectional view of a spindle motor (second embodiment) of a magnetic disk type storage device according to the present invention. FIG. 6 is a sectional view of a spindle motor (third embodiment) of the magnetic disk type storage device according to the present invention. Side view of the spindle motor of the magnetic disk type storage device. FIG. 8 is an explanatory view showing an example of the assembly procedure of the spindle motor of the conventional magnetic disk type storage device.
DESCRIPTION OF SYMBOLS 1,30,50 ... Spindle motor 11, 61 ... Base member, 12, 62 ... Shaft member, 12b, 62b ... Reference | standard step part, 13, 14, 63, 64 ... Bearing, 13a, 14a, 63a, 64a ... Inner ring 15, 65 ... Stator, 21, 41 ... Hub, 23, 43 ... Magnet (magnetic pole magnet).

Claims (2)

嵌合孔を有するベース部材と、
前記嵌合孔に挿嵌して固定された軸部材と、
前記軸部材に内輪を固定された第１及び第２のベアリングと、
前記１及び第２のベアリングの外輪に支持され前記軸部材に対して回転自在とされたハブ２１と、を備えたスピンドルモータにおいて、
前記軸部材に、前記第１のベアリングの内輪と嵌合してこれを固定する嵌合部と、この嵌合部から外側に向かって立ち上がる基準段部とを設け、
前記第１のベアリングの内輪における前記第２のベアリングと対向しない端面を前記基準段部に当接させる共に、前記第１のベアリングの外輪における前記第２ベアリングと対向する端面を前記ハブと当接させる構成にして成ることを特徴とするスピンドルモータ。 A base member having a fitting hole ;
A shaft member inserted and fixed in the fitting hole ;
First and second bearings having an inner ring fixed to the shaft member ;
A spindle motor comprising: a hub 21 supported by outer rings of the first and second bearings and rotatable with respect to the shaft member;
The shaft member is provided with a fitting portion that fits and fixes the inner ring of the first bearing, and a reference step portion that rises outward from the fitting portion ,
An end face of the inner ring of the first bearing that does not face the second bearing is brought into contact with the reference step portion, and an end face of the outer ring of the first bearing that faces the second bearing is brought into contact with the hub. A spindle motor characterized by having a configuration to be made . 軸方向の高さの基準となる基準面と嵌合孔とを有するベース部材と、A base member having a reference surface serving as a reference for height in the axial direction and a fitting hole;
前記嵌合孔に挿嵌して固定された軸部材と、A shaft member inserted and fixed in the fitting hole;
前記軸部材に内輪を固定された第１及び第２のベアリングと、First and second bearings having an inner ring fixed to the shaft member;
軸方向の高さの基準となるフランジ面を有し、前記１及び第２のベアリングの外輪に支持され前記軸部材に対して回転自在とされたハブと、を備え、A hub surface having a flange surface that serves as a reference for the height in the axial direction, and a hub that is supported by the outer rings of the first and second bearings and is rotatable with respect to the shaft member;
前記基準面と前記フランジ面との軸方向距離が所定距離となるよう前記ベース部材に対して前記ハブを配置して成るスピンドルモータを製造する、スピンドルモータの製造方法において、In a manufacturing method of a spindle motor, manufacturing a spindle motor in which the hub is arranged with respect to the base member so that an axial distance between the reference surface and the flange surface is a predetermined distance.
前記軸部材は、前記第１のベアリングの内輪と嵌合してこれを固定する嵌合部と、この嵌合部から外側に向かって立ち上がる基準段部とを備えており、The shaft member includes a fitting portion that fits and fixes the inner ring of the first bearing, and a reference step portion that rises outward from the fitting portion,
前記第１及び第２のベアリングの内輪を前記軸部材に固定する際に、前記第１のベアリングの内輪における前記第２のベアリングと対向しない端面を前記基準段部に当接させて固定する一方、前記第１のベアリングの外輪における前記第２のベアリングと対向する端面を前記ハブと当接させて、前記軸部材と前記第１及び前記第２のベアリングと前記ハブとを一体化したハブ組立体を組み立てる行程と、When the inner rings of the first and second bearings are fixed to the shaft member, the end faces of the inner rings of the first bearing that are not opposed to the second bearing are brought into contact with the reference step portion and fixed. A hub assembly in which an end surface of the outer ring of the first bearing facing the second bearing is brought into contact with the hub, and the shaft member, the first and second bearings, and the hub are integrated. The process of assembling a solid,
前記ハブ組立体の前記軸部材を前記嵌合孔に挿入し、前記基準面と前記フランジ面との前記軸方向距離が所定距離となるよう前記軸部材の前記嵌合孔に対する軸方向の挿入位置を調整する行程と、を有することを特徴とするスピンドルモータの製造方法。The shaft member of the hub assembly is inserted into the fitting hole, and the axial insertion position of the shaft member with respect to the fitting hole is such that the axial distance between the reference surface and the flange surface is a predetermined distance. And a step of adjusting the rotation speed of the spindle motor.
JP33581096A 1996-12-16 1996-12-16 Spindle motor and manufacturing method thereof Expired - Fee Related JP3713856B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33581096A JP3713856B2 (en) 1996-12-16 1996-12-16 Spindle motor and manufacturing method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33581096A JP3713856B2 (en) 1996-12-16 1996-12-16 Spindle motor and manufacturing method thereof

Publications (2)

Publication Number Publication Date
JPH10174348A JPH10174348A (en) 1998-06-26
JP3713856B2 true JP3713856B2 (en) 2005-11-09

Family

ID=18292681

Family Applications (1)

Application Number Title Priority Date Filing Date
JP33581096A Expired - Fee Related JP3713856B2 (en) 1996-12-16 1996-12-16 Spindle motor and manufacturing method thereof

Country Status (1)

Country Link
JP (1) JP3713856B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002044903A (en) 2000-07-21 2002-02-08 Minebea Co Ltd Spindle motor and manufacturing method thereof

Also Published As

Publication number Publication date
JPH10174348A (en) 1998-06-26

Similar Documents

Publication Publication Date Title
JP3762860B2 (en) motor
JPH02133055A (en) Peripherally opposed type motor
US20050006965A1 (en) Rotational driving device
JP3713856B2 (en) Spindle motor and manufacturing method thereof
US20060126977A1 (en) Fluid Dynamic Pressure Bearing Device, and Spindle Motor and Recording Disk Driving Apparatus
EP0770998A1 (en) Hard disc drive with a compound bearing assembly
JP5777876B2 (en) Brushless motor and disk drive device
JP2651925B2 (en) Disk drive motor incorporated from one side of the disk drive
JPH09112546A (en) Hard disk driving device furnished with complex bearing device
EP0859361A1 (en) Hard disk drive device
US10612584B2 (en) Fluid dynamic bearing device, motor, and disk drive device
JPH0775312A (en) Spindle motor
JP3003308U (en) Bearing support structure for rotating electrical machines
WO2022038727A1 (en) Rotor of rotating electric machine and rotating electric machine
JP2000102210A (en) Brushless motor and manufacture thereof
JP3974493B2 (en) Manufacturing method of stator for inner rotor type motor
JPH1169750A (en) Motor
US8106560B2 (en) Stiffness of brushless motor including stator core and disk drive
JPH10322949A (en) Spindle motor
JP3585152B2 (en) Thin motor
JP3370892B2 (en) motor
JPH10229651A (en) Spindle motor
JP2000004558A (en) Motor and disk drive
JP2013090465A (en) Motor for disk rotation and disk driving device using the same
KR19980067021A (en) Spindle Motor Assembly of Disc Player

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20040909

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20040913

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20041105

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20050802

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20050815

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313113

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080902

Year of fee payment: 3

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090902

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090902

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100902

Year of fee payment: 5

LAPS Cancellation because of no payment of annual fees