JP4732262B2 - Method for manufacturing hydrodynamic bearing device - Google Patents

Method for manufacturing hydrodynamic bearing device Download PDF

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JP4732262B2
JP4732262B2 JP2006199854A JP2006199854A JP4732262B2 JP 4732262 B2 JP4732262 B2 JP 4732262B2 JP 2006199854 A JP2006199854 A JP 2006199854A JP 2006199854 A JP2006199854 A JP 2006199854A JP 4732262 B2 JP4732262 B2 JP 4732262B2
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housing
mold
bearing sleeve
bearing
end surface
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JP2008025739A (en
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仁彦 尾藤
信好 山下
正明 戸田
洋 赤井
弘次 川島
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NTN Corp
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Description

本発明は動圧軸受装置の製造方法に関するものである。   The present invention relates to a method for manufacturing a hydrodynamic bearing device.

動圧軸受装置は、軸受隙間に生じる潤滑流体の動圧作用で、支持すべき回転部材を回転自在に非接触支持する軸受装置である。この種の軸受装置は、高速回転、高回転精度、低騒音等の特徴を備えるものであり、情報機器をはじめ種々の電気機器に搭載されるモータ用の軸受装置として、より具体的にはＨＤＤ等の磁気ディスク装置、ＣＤ−ＲＯＭ、ＣＤ−Ｒ／ＲＷ、ＤＶＤ−ＲＯＭ／ＲＡＭ等の光ディスク装置、ＭＤ、ＭＯ等の光磁気ディスク装置等におけるディスクドライブのスピンドルモータ用の軸受装置として、あるいはレーザビームプリンタ（ＬＢＰ）のポリゴンスキャナモータ、プロジェクタのカラーホイールモータ、ファンモータなどのモータ用軸受装置として好適に使用される。   The hydrodynamic bearing device is a bearing device that rotatably supports a rotating member to be supported by a hydrodynamic action of a lubricating fluid generated in a bearing gap. This type of bearing device has features such as high-speed rotation, high rotation accuracy, and low noise, and more specifically as a bearing device for motors installed in various electrical equipment including information equipment. As a bearing device for a spindle motor of a disk drive in an optical disk device such as a magnetic disk device such as CD-ROM, CD-R / RW, DVD-ROM / RAM, or a magneto-optical disk device such as MD or MO, or a laser It is preferably used as a bearing device for a motor such as a polygon scanner motor of a beam printer (LBP), a color wheel motor of a projector, or a fan motor.

ＨＤＤ等のディスク装置用のスピンドルモータに組み込まれる動圧軸受装置としては、例えば内周面がラジアル軸受隙間に面し、また一端面が一のスラスト軸受隙間に面する軸受スリーブと、一端面が他方のスラスト軸受隙間に面するハウジングとを備えた構成のものが公知である（例えば、特許文献１参照）。
特開２００５−３３７３４３号公報 As a hydrodynamic bearing device incorporated in a spindle motor for a disk device such as an HDD, for example, a bearing sleeve whose inner peripheral surface faces a radial bearing gap and whose one end surface faces one thrust bearing gap, and one end surface thereof The thing of the structure provided with the housing which faces the other thrust bearing clearance gap is well-known (for example, refer patent document 1).
JP 2005-337343 A

近年では、情報機器における記録密度の増大や高速回転化に対応するため、上記動圧軸受装置には更なる高回転精度化が求められている。この種の要請に対応するためには、ラジアル軸受隙間やスラスト軸受隙間の幅寸法の更なる高精度管理が重要となり、そのため、軸受隙間の幅寸法精度を左右するハウジングと軸受スリーブの組み付け作業には細心の注意が払われている。   In recent years, in order to cope with an increase in recording density and high speed rotation in information equipment, the dynamic pressure bearing device is required to have higher rotational accuracy. In order to meet this type of request, it is important to further control the width dimensions of radial bearing gaps and thrust bearing gaps. For this reason, it is necessary to assemble the housing and bearing sleeve, which affect the width dimension accuracy of the bearing gap. Is very careful.

ハウジングと軸受スリーブとの間で高い組付け精度を得るための手段として、ハウジングや軸受スリーブを例えば金属の削り加工で高精度に形成する方法がまず考えられる。しかしながら、機械加工は総じて製造コストが高く付くため、今以上の低コスト化は困難な状況にある。機械加工等に代えて、ハウジングや軸受スリーブを型成形で形成すれば、製造コストの低減化は可能であるが、型成形は成形品間の寸法精度にバラツキを生じ易く、組み付け品の精度確保が難しい。   As a means for obtaining a high assembling accuracy between the housing and the bearing sleeve, a method of forming the housing and the bearing sleeve with high accuracy by, for example, metal shaving is conceivable. However, since machining is generally expensive to manufacture, further cost reduction is difficult. If the housing and bearing sleeve are formed by molding instead of machining, manufacturing costs can be reduced. However, mold molding tends to cause variations in dimensional accuracy between molded products, ensuring the accuracy of the assembled product. Is difficult.

以上より、本発明の課題は、部品精度によらず、ハウジングに対する軸受スリーブの組付け精度を低コストに高めた動圧軸受装置の製造方法を提供することである。   As described above, an object of the present invention is to provide a method of manufacturing a hydrodynamic bearing device in which the assembly accuracy of the bearing sleeve to the housing is increased at a low cost regardless of the component accuracy.

前記課題を解決するため、本発明は、内周面がラジアル軸受隙間に面する軸受スリーブを、軸方向一方の端面がスラスト軸受隙間に面するハウジングの内周にすきま接着で固定するに際し、一対の金型の型締めに伴い軸受スリーブの上記内周面を拘束する第１拘束面を一方の金型に設けると共に、上記型締めに伴いハウジングの上記端面を拘束する第２拘束面を他方の金型に設けて、第１拘束面と第２拘束面との間の直角度を管理するようにし、かつ、上記型締めに伴い、何れか一方の金型に弾性支持された可動型と第１拘束面とでハウジングおよびハウジングの内周に導入された軸受スリーブを半径方向に挟持すると共に、上記可動型と第２拘束面とでハウジングを軸方向に挟持するようにしたことを特徴とする動圧軸受装置の製造方法を提供する。 To solve the above problems, when the present invention, the bearing sleeve whose inner peripheral surface facing the radial bearing gap, one end face in the axial direction is fixed by a gap adhered to the inner periphery of the housing which faces the thrust bearing gap, the pair A first constraining surface that constrains the inner peripheral surface of the bearing sleeve is provided in one mold as the mold is clamped, and a second constraining surface that constrains the end surface of the housing is coupled to the other as the mold is clamped . A movable mold that is provided on the mold so as to manage the perpendicularity between the first restraining surface and the second restraining surface , and that is elastically supported by one of the molds when the mold is clamped, and the first The housing and the bearing sleeve introduced into the inner periphery of the housing are clamped in the radial direction by the one restraint surface, and the housing is clamped in the axial direction by the movable die and the second restraint surface. Manufacturing method of hydrodynamic bearing device Subjected to.

上述のように、本発明に係る製造方法によれば、軸受スリーブをハウジングの内周にすき間接着で固定することで、これら組み付け品に過度の負荷を与えることなく、ハウジングに対する軸受スリーブの固定姿勢を型締め中に矯正することができる。従って、上述の
ように、軸受スリーブの内周面を拘束する第１拘束面と、ハウジングの端面を拘束する第２拘束面との間の直角度を管理することにより、軸受スリーブの内周面とハウジングの端面との間で高い直角度を有した状態で、かかる軸受スリーブをハウジングの内周に固定することができる。 As described above, according to the manufacturing method of the present invention, the bearing sleeve is fixed to the inner periphery of the housing by gap adhesion, so that the bearing sleeve is fixed to the housing without applying an excessive load to the assembly. Can be corrected during mold clamping. Therefore, as described above, the inner peripheral surface of the bearing sleeve is managed by managing the perpendicularity between the first constraining surface that constrains the inner peripheral surface of the bearing sleeve and the second constraining surface that constrains the end surface of the housing. Such a bearing sleeve can be fixed to the inner periphery of the housing with a high squareness between the housing and the end face of the housing.

ハウジングと軸受スリーブとの間で求められる組み付け精度（形状精度）としては、上記直角度のほか、軸受スリーブの端面とハウジングの端面との間の平行度が求められる場合がある。すなわち、上記特許文献１に記載の如く、軸受スリーブの軸方向一方の端面が一方のスラスト軸受隙間に面すると共に、ハウジングの軸方向他方の端面が他方のスラスト軸受隙間に面する場合に両端面間で高い平行度が要求される。 As the assembly accuracy (shape accuracy) required between the housing and the bearing sleeve, in addition to the squareness, a parallelism between the end surface of the bearing sleeve and the end surface of the housing may be required. Ends That is, as described in Patent Document 1, the axial one end face of the bearing sleeve facing the thrust bearing gap of hand, when the axial end face of the other housing is facing the other of the thrust bearing gap A high degree of parallelism is required between the surfaces.

そこで、上記要求に対応するため、本発明は、内周面がラジアル軸受隙間に面すると共に、軸方向他方の端面が第１のスラスト軸受隙間に面する軸受スリーブを、軸方向一方の端面が第２のスラスト軸受隙間に面するハウジングの内周にすきま接着で固定するに際し、一対の金型の型締めに伴い軸受スリーブの上記端面を拘束する第３拘束面を一方の金型に設けると共に、上記型締めに伴いハウジングの上記端面を拘束する第２拘束面を他方の金型に設けて、第２拘束面と第３拘束面との間の平行度を管理するようにし、かつ、上記型締めに伴い、何れか一方の金型に弾性支持された可動型と第３拘束面とで軸受スリーブを軸方向に挟持すると共に、他方の金型に弾性支持された可動型と第２拘束面とでハウジングを軸方向に挟持するようにしたことを特徴とする動圧軸受装置の製造方法を提供する。 Therefore, in order to cope with the demand, the present invention, together with the inner circumferential surface facing the radial bearing gap, the bearing sleeve the end face of the other axial faces the first thrust bearing gap, one end face in the axial direction When fixing to the inner periphery of the housing facing the second thrust bearing gap by clearance bonding, a third constraining surface for constraining the end surfaces of the bearing sleeves is provided in one mold as the pair of molds are clamped. A second constraining surface for constraining the end surface of the housing in accordance with the mold clamping is provided in the other mold so as to manage parallelism between the second constraining surface and the third constraining surface ; and As the mold is clamped, the movable sleeve elastically supported by one of the molds and the third restraining surface sandwich the bearing sleeve in the axial direction, and the movable mold elastically supported by the other mold and the second restraint. So that the housing is clamped axially with the surface To provide a method of manufacturing a dynamic pressure bearing device, characterized in that the.

上述の方法によれば、軸受スリーブをハウジングの内周にすき間接着で固定することで、これら組み付け品に過度の負荷を与えることなく、ハウジングに対する軸受スリーブの固定姿勢を型締め中に矯正することができる。従って、上述のように、一方（第１）のスラスト軸受隙間に面する軸受スリーブの軸方向他方の端面を拘束する第３拘束面と、他方（第２）のスラスト軸受隙間に面するハウジングの軸方向一方の端面を拘束する第２拘束面との間の平行度を管理することにより、ハウジングの端面と、軸受スリーブの端面との間で高い平行度を有した状態で、かかる軸受スリーブをハウジングの内周に固定することができる。 According to the above-described method, the bearing sleeve is fixed to the inner periphery of the housing by gap adhesion, thereby correcting the fixing posture of the bearing sleeve with respect to the housing during mold clamping without applying an excessive load to these assemblies. Can do. Therefore, as described above, the third constraining surface constraining the other axial end surface of the bearing sleeve facing one (first) thrust bearing gap and the housing facing the other (second) thrust bearing gap. By controlling the parallelism between the second constraining surface that constrains one end surface in the axial direction , the bearing sleeve is provided with a high degree of parallelism between the end surface of the housing and the end surface of the bearing sleeve. It can be fixed to the inner periphery of the housing.

ところで、上記何れの方法においても、接着固定される軸受スリーブの外周面やハウジングの内周面は、それほど高い形状精度（面精度）を必要としないため、加工方法によらず、残る他の面を高精度に仕上げることはそれほど困難ではない。そのため、例えば上述のように、軸受スリーブの端面でスラスト軸受隙間を構成する場合には、かかる端面とラジアル軸受隙間に面する内周面との直角度を比較的高精度に仕上げることができる。従って、上述のように、軸受スリーブの端面を拘束する第１拘束面と、ハウジングの端面を拘束する第２拘束面との間の平行度を管理することで、両端面間で高い平行度が得られると共に、軸受スリーブの内周面と、ハウジングの上記端面との間で高い直角度を確保した状態で両部材を固定することが可能となる。   By the way, in any of the above methods, the outer peripheral surface of the bearing sleeve and the inner peripheral surface of the housing to be bonded and fixed do not require a very high shape accuracy (surface accuracy). It is not so difficult to finish with high precision. Therefore, for example, as described above, when the thrust bearing gap is formed by the end surface of the bearing sleeve, the perpendicularity between the end surface and the inner peripheral surface facing the radial bearing gap can be finished with relatively high accuracy. Therefore, as described above, by managing the parallelism between the first constraining surface that constrains the end surface of the bearing sleeve and the second constraining surface that constrains the end surface of the housing, a high degree of parallelism can be achieved between the two end surfaces. As a result, both members can be fixed in a state where a high squareness is secured between the inner peripheral surface of the bearing sleeve and the end surface of the housing.

上記直角度あるいは平行度の管理に加えて、本発明では、ハウジングの外周面を拘束する第４拘束面と、軸受スリーブの内周面を拘束する第１拘束面との間の同軸度を管理した状態で軸受スリーブをハウジングの内周に固定することも可能である。かかる方法によれば、第４拘束面により拘束されるハウジングの外周面と、第１拘束面により拘束される軸受スリーブの内周面との間で高い同軸度を持たせた状態で、かかる軸受スリーブをハウジングの内周に固定することができる。 In addition to managing the perpendicularity or parallelism, in the present invention, the coaxiality between the fourth constraining surface that constrains the outer peripheral surface of the housing and the first constraining surface that constrains the inner peripheral surface of the bearing sleeve is managed. In this state, the bearing sleeve can be fixed to the inner periphery of the housing. According to this method, such a bearing is provided with a high degree of coaxiality between the outer peripheral surface of the housing constrained by the fourth constraining surface and the inner peripheral surface of the bearing sleeve constrained by the first constraining surface. The sleeve can be fixed to the inner periphery of the housing.

上述のようにして、ハウジングに対する軸受スリーブの固定姿勢を決定した後、接着剤を固化させることで、軸受スリーブのハウジングへの固定がなされる。そのため、一旦ハウジングに対する軸受スリーブの固定姿勢を決定すれば、その姿勢を崩すことなく例えば加熱のみで両部材を固定することができ、これにより高精度かつ高強度な組み付け品を得ることができる。   As described above, after determining the fixing posture of the bearing sleeve with respect to the housing, the adhesive is solidified to fix the bearing sleeve to the housing. For this reason, once the fixing posture of the bearing sleeve with respect to the housing is determined, both members can be fixed, for example, only by heating without breaking the posture, thereby obtaining an assembly with high accuracy and high strength.

以上のことから、本発明によれば、部品精度によらず、ハウジングに対する軸受スリーブの組付け精度を低コストに高めた動圧軸受装置の製造方法を提供することができる。   From the above, according to the present invention, it is possible to provide a method for manufacturing a hydrodynamic bearing device that increases the assembly accuracy of the bearing sleeve to the housing at a low cost regardless of the component accuracy.

以下、本発明の第１実施形態に係る動圧軸受装置の製造方法およびこれにより製造される動圧軸受装置を図面に基づいて説明する。なお、以下の説明における『上下』方向は単に各図における上下方向を便宜的に示すもので、動圧軸受装置の設置方向や使用態様、あるいは後述する製造方法に係る製造装置等の設置方向を特定するものではない。   Hereinafter, a method for manufacturing a fluid dynamic bearing device according to a first embodiment of the present invention and a fluid dynamic bearing device manufactured thereby will be described with reference to the drawings. The “up and down” direction in the following description simply indicates the up and down direction in each drawing for the sake of convenience, and indicates the installation direction and usage of the hydrodynamic bearing device, or the installation direction of the manufacturing apparatus according to the manufacturing method described later. Not specific.

図１は、本発明の第１実施形態に係る製造方法により製造される動圧軸受装置１を組込んだ情報機器用スピンドルモータの一構成例を概念的に示している。このスピンドルモータは、ＨＤＤ等のディスク駆動装置に用いられるもので、軸部２を備えた回転部材３を回転自在に非接触支持する動圧軸受装置１と、例えば半径方向のギャップを介して対向させたステータコイル４およびロータマグネット５と、ブラケット６とを備えている。ステータコイル４はブラケット６に取付けられ、ロータマグネット５は回転部材３に取付けられている。動圧軸受装置１のハウジング７は、ブラケット６の内周に固定される。また、図示は省略するが、回転部材３には、磁気ディスク等のディスク状情報記録媒体（以下、単にディスクという。）が一又は複数枚保持される。ステータコイル４に通電すると、ステータコイル４とロータマグネット５との間に発生する励磁力でロータマグネット５が回転し、これに伴って、回転部材３および回転部材３に保持されたディスクが軸部２と一体に回転する。   FIG. 1 conceptually shows a configuration example of a spindle motor for information equipment incorporating a fluid dynamic bearing device 1 manufactured by the manufacturing method according to the first embodiment of the present invention. This spindle motor is used in a disk drive device such as an HDD, and is opposed to the hydrodynamic bearing device 1 that rotatably supports the rotating member 3 including the shaft portion 2 through a gap in the radial direction, for example. The stator coil 4 and the rotor magnet 5 and the bracket 6 are provided. The stator coil 4 is attached to the bracket 6, and the rotor magnet 5 is attached to the rotating member 3. The housing 7 of the hydrodynamic bearing device 1 is fixed to the inner periphery of the bracket 6. Although not shown, the rotating member 3 holds one or a plurality of disk-shaped information recording media (hereinafter simply referred to as disks) such as magnetic disks. When the stator coil 4 is energized, the rotor magnet 5 is rotated by an exciting force generated between the stator coil 4 and the rotor magnet 5, and accordingly, the rotating member 3 and the disk held by the rotating member 3 are moved to the shaft portion. 2 and rotate together.

図２は、動圧軸受装置１を示している。この動圧軸受装置１は、ハウジング７と、ハウジング７の内周に固定される軸受スリーブ８と、ハウジング７の一端を閉口する蓋部材１０と、ハウジング７および軸受スリーブ８に対して相対回転する回転部材３とを主に備えている。   FIG. 2 shows the hydrodynamic bearing device 1. The hydrodynamic bearing device 1 rotates relative to the housing 7, a bearing sleeve 8 fixed to the inner periphery of the housing 7, a lid member 10 that closes one end of the housing 7, and the housing 7 and the bearing sleeve 8. The rotary member 3 is mainly provided.

回転部材３は、軸受スリーブ８の内周に挿入される軸部２と、軸部２の上端に設けられ、ハウジング７の開口側に配置されるハブ部９とを主に備えている。   The rotating member 3 mainly includes a shaft portion 2 that is inserted into the inner periphery of the bearing sleeve 8 and a hub portion 9 that is provided at the upper end of the shaft portion 2 and is disposed on the opening side of the housing 7.

軸部２は、この実施形態ではハブ部９と一体に形成され、その下端に抜止めとしてフランジ部１１を別体に備えている。フランジ部１１は、金属製で、例えばねじ結合等の手段により軸部２に固定される。   The shaft portion 2 is formed integrally with the hub portion 9 in this embodiment, and is provided with a flange portion 11 as a separate member at the lower end thereof. The flange portion 11 is made of metal and is fixed to the shaft portion 2 by means such as screw connection.

ハブ部９は、ハウジング７の開口側（上側）を覆う円盤部９ａと、円盤部９ａの外周部から軸方向下方に延びる筒状部９ｂと、筒状部９ｂから外径側に突出する鍔部９ｄと、鍔部９ｄの上端に形成されるディスク搭載面９ｃとを備える。図示されていないディスクは円盤部９ａの外周に外嵌され、ディスク搭載面９ｃに載置される。そして、図示しない適当な保持手段によってディスクがハブ部９に保持される。 The hub portion 9 includes a disc portion 9a that covers the opening side (upper side) of the housing 7, a cylindrical portion 9b that extends axially downward from the outer peripheral portion of the disc portion 9a, and a flange that protrudes outward from the cylindrical portion 9b. A portion 9d and a disk mounting surface 9c formed at the upper end of the flange portion 9d. A disk (not shown) is fitted on the outer periphery of the disk portion 9a and placed on the disk mounting surface 9c. Then, the disk is held on the hub portion 9 by an appropriate holding means (not shown).

ハウジング７は、金属あるいは樹脂で形成される。この実施形態では、ハウジング７は金属の鍛造加工で略円筒状に成形される。ハウジング７の端面（上端面）７ｂの全面または一部環状領域には、スラスト動圧発生部として、例えば図４に示すように、複数の動圧溝７ｂ１をスパイラル形状に配列した領域（動圧発生部Ｂ）が形成される。上端面７ｂの動圧溝７ｂ１形成領域は円盤部９ａの下端面９ａ１と対向し、軸部２の回転時、下端面９ａ１との間に後述する第１スラスト軸受部Ｔ１のスラスト軸受隙間を形成する（図２を参照）。   The housing 7 is made of metal or resin. In this embodiment, the housing 7 is formed in a substantially cylindrical shape by metal forging. As shown in FIG. 4, for example, as shown in FIG. 4, an area (dynamic pressure) in which a plurality of dynamic pressure grooves 7 b 1 are arranged as a thrust dynamic pressure generating portion on the entire end surface (upper end surface) 7 b or a partial annular region of the housing 7. A generating part B) is formed. The dynamic pressure groove 7b1 formation region of the upper end surface 7b is opposed to the lower end surface 9a1 of the disk portion 9a, and a thrust bearing gap of the first thrust bearing portion T1 described later is formed between the lower end surface 9a1 and the shaft portion 2 when rotating. (See FIG. 2).

ハウジング７の上方部外周（上端面７ｂ側の外周面）には、上方に向かって漸次拡径する環状のテーパ面７ｃが形成される。テーパ面７ｃは筒状部９ｂの内周面９ｂ１と対向し
、内周面９ｂ１との間に半径方向寸法が上方に向かって漸次縮小するテーパ状のシール空間Ｓを形成する。潤滑油を動圧軸受装置１内部に充満させた状態では、潤滑油の油面は常時シール空間Ｓの範囲内にある。 On the outer periphery of the upper part of the housing 7 (the outer peripheral surface on the upper end surface 7b side), an annular tapered surface 7c that gradually increases in diameter upward is formed. The tapered surface 7c faces the inner peripheral surface 9b1 of the cylindrical portion 9b, and forms a tapered seal space S in which the radial dimension gradually decreases upward with respect to the inner peripheral surface 9b1. In a state where the lubricating oil is filled in the hydrodynamic bearing device 1, the oil level of the lubricating oil is always within the range of the seal space S.

ハウジング７の下端開口部は、軸受スリーブ８が固定される内周面７ａよりも大径に形成され、この大径内周面７ｄに、例えば、ステンレス鋼や黄銅等の金属材料で形成された蓋部材１０が圧入、あるいは圧入接着等の手段により固定されている。   The lower end opening of the housing 7 is formed with a larger diameter than the inner peripheral surface 7a to which the bearing sleeve 8 is fixed, and is formed on the large inner peripheral surface 7d with a metal material such as stainless steel or brass. The lid member 10 is fixed by means such as press fitting or press fitting.

軸受スリーブ８は、例えば焼結金属からなる多孔質体で円筒状に形成される。この実施形態では、軸受スリーブ８は、銅を主成分とする焼結金属の多孔質体で円筒状に形成され、ハウジング７の内周面７ａに接着固定される。もちろん、軸受スリーブ８を多孔質以外の材料、例えば樹脂やセラミック、その他の金属材料で形成することも可能である。   The bearing sleeve 8 is formed in a cylindrical shape with a porous body made of sintered metal, for example. In this embodiment, the bearing sleeve 8 is made of a sintered metal porous body mainly composed of copper and formed in a cylindrical shape, and is bonded and fixed to the inner peripheral surface 7 a of the housing 7. Of course, it is also possible to form the bearing sleeve 8 with a material other than the porous material, for example, resin, ceramic, or other metal material.

軸受スリーブ８の内周面８ａの全面又は一部円筒領域には、ラジアル動圧発生部として複数の動圧溝を配列した領域（動圧発生部Ａ）が形成される。この実施形態では、例えば図３（ａ）に示すように、複数の動圧溝８ａ１、８ａ２をヘリングボーン形状に配列してなる動圧発生部Ａが軸方向に離隔して２箇所形成される。動圧溝８ａ１、８ａ２形成領域は、軸部２を軸受スリーブ８の内周に挿入した状態では、軸部２の外周面２ａと対向し、軸部２の回転時、対向する軸部２の外周面２ａとの間に後述する第１、第２ラジアル軸受部Ｒ１、Ｒ２のラジアル軸受隙間をそれぞれ形成する（図２を参照）。なお、この実施形態では、上側の動圧発生部Ａを構成する動圧溝８ａ１は、軸方向中心ｍ（上下の傾斜溝間領域の軸方向中央）に対して軸方向非対称に形成されており、軸方向中心ｍより上側領域の軸方向寸法Ｘ１が下側領域の軸方向寸法Ｘ２よりも大きくなっている。一方、下側の動圧発生部Ａを構成する動圧溝８ａ２は軸方向対称に形成されている。また、軸受スリーブ８の外周面８ｂには、１又は複数本（例えば３本）の軸方向溝８ｂ１が軸方向全長に亘って形成されている。   A region (dynamic pressure generating portion A) in which a plurality of dynamic pressure grooves are arranged is formed as a radial dynamic pressure generating portion on the entire inner surface 8a of the bearing sleeve 8 or a partial cylindrical region. In this embodiment, for example, as shown in FIG. 3A, two dynamic pressure generating portions A formed by arranging a plurality of dynamic pressure grooves 8a1 and 8a2 in a herringbone shape are formed at two positions apart in the axial direction. . The dynamic pressure grooves 8a1 and 8a2 forming regions face the outer peripheral surface 2a of the shaft portion 2 in a state where the shaft portion 2 is inserted into the inner periphery of the bearing sleeve 8, and when the shaft portion 2 rotates, Radial bearing gaps of first and second radial bearing portions R1 and R2, which will be described later, are formed between the outer peripheral surface 2a (see FIG. 2). In this embodiment, the dynamic pressure groove 8a1 constituting the upper dynamic pressure generating part A is formed axially asymmetric with respect to the axial center m (the axial center of the region between the upper and lower inclined grooves). The axial dimension X1 in the upper region from the axial center m is larger than the axial dimension X2 in the lower region. On the other hand, the dynamic pressure grooves 8a2 constituting the lower dynamic pressure generating portion A are formed symmetrically in the axial direction. Further, one or a plurality of (for example, three) axial grooves 8b1 are formed on the outer peripheral surface 8b of the bearing sleeve 8 over the entire axial length.

軸受スリーブ８の下端面８ｃの全面又は一部環状領域には、動圧発生部Ｃとして、例えば図３（ｂ）に示すように、複数の動圧溝８ｃ１をスパイラル状に配列した領域が形成される。下端面８ｃの動圧溝８ｃ１形成領域（動圧発生部Ｃ）はフランジ部２ｂの上端面２ｂ１と対向し、軸部２の回転時、対向する上端面２ｂ１との間に後述する第２スラスト軸受部Ｔ２のスラスト軸受隙間を形成する（図２を参照）。   As shown in FIG. 3B, for example, as shown in FIG. 3B, a region in which a plurality of dynamic pressure grooves 8c1 are arranged in a spiral shape is formed on the entire lower surface 8c of the bearing sleeve 8 or a partial annular region. Is done. The dynamic pressure groove 8c1 formation region (dynamic pressure generating portion C) of the lower end surface 8c is opposed to the upper end surface 2b1 of the flange portion 2b, and a second thrust described later between the opposed upper end surface 2b1 when the shaft portion 2 rotates. A thrust bearing gap is formed in the bearing portion T2 (see FIG. 2).

以下、軸受スリーブ８をハウジング７の内周に接着固定する工程の一例を、図５〜図７に基づいて説明する。   Hereinafter, an example of the process of adhering and fixing the bearing sleeve 8 to the inner periphery of the housing 7 will be described with reference to FIGS.

図５は、軸受スリーブ８をハウジング７の内周に位置決め固定する工程の一例を概念的に示すものである。この工程で用いられる製造装置２０は、同図に示すように、水平配置された台座２１に固定された２本又は３本以上の支柱２２と、支柱２２間に配置され、同じく台座２１に固定された固定ピン２３と、固定ピン２３の外周に配置された可動型２４と、支柱２２に挿入されたピン２５と、ピン２５にガイドされ、台座２１に対して軸方向に相対移動可能な押え型２６とを備えている。なお、説明の便宜上、台座２１の側を下側、押え型２６の側を上側として以下説明を進める。   FIG. 5 conceptually shows an example of the process of positioning and fixing the bearing sleeve 8 to the inner periphery of the housing 7. As shown in the figure, the manufacturing apparatus 20 used in this process is arranged between two or three or more support columns 22 fixed to a horizontally arranged pedestal 21 and the support columns 22, and is also fixed to the pedestal 21. The fixed pin 23, the movable mold 24 arranged on the outer periphery of the fixed pin 23, the pin 25 inserted into the support column 22, and the presser which is guided by the pin 25 and is movable relative to the base 21 in the axial direction. And a mold 26. For convenience of explanation, the following explanation will be made with the pedestal 21 side as the lower side and the presser die 26 side as the upper side.

固定ピン２３は、図６に示すように、軸受スリーブ８の保持部２３ａと、保持部２３ａよりも大径に形成されたガイド部２３ｂと、ガイド部２３ｂよりも大径に形成されたベース部２３ｃとを備え、ベース部２３ｃの下端が台座２１に固定されている。保持部２３ａは軸受スリーブ８を保持、拘束するためのものであり、円筒状の外周面２３ａ２と、外周面２３ａ２の下端から外径側に広がる円環状の上端面２３ａ１とを有する。   As shown in FIG. 6, the fixing pin 23 includes a holding portion 23a of the bearing sleeve 8, a guide portion 23b having a larger diameter than the holding portion 23a, and a base portion having a larger diameter than the guide portion 23b. 23c, and the lower end of the base portion 23c is fixed to the base 21. The holding portion 23a is for holding and restraining the bearing sleeve 8, and has a cylindrical outer peripheral surface 23a2 and an annular upper end surface 23a1 extending from the lower end of the outer peripheral surface 23a2 to the outer diameter side.

保持部２３ａの上端面２３ａ１は、型締め時、軸受スリーブ８の下端面８ｃを拘束可能な第３拘束面となる。この端面（第３拘束面）２３ａ１は、支柱２２の上端面２２ａから軸方向寸法ｔだけ離隔した位置に設けられる（図６を参照）。ここで、軸方向寸法ｔは、ハウジング７の上端面７ｂ（動圧発生部Ｂの形成面）と軸受スリーブ８の下端面８ｃ（動圧発生部Ｃの形成面）との離間距離（図２を参照）に等しい値に設定されている。 The upper end surface 23a1 of the holding portion 23a serves as a third constraining surface that can constrain the lower end surface 8c of the bearing sleeve 8 during mold clamping. The end surface ( third constraining surface) 23a1 is provided at a position separated from the upper end surface 22a of the support column 22 by the axial dimension t (see FIG. 6). Here, the axial dimension t is a separation distance between the upper end surface 7b of the housing 7 (formation surface of the dynamic pressure generating portion B) and the lower end surface 8c of the bearing sleeve 8 (formation surface of the dynamic pressure generating portion C) (FIG. 2). Is set to a value equal to

保持部２３ａの外周面２３ａ２は、軸受スリーブ８を上端面２３ａ１に当接した状態で、軸受スリーブ８の内周面８ａを保持可能な程度の外径寸法に設定されている。そのため、型締め時、外周面２３ａ２は、軸受スリーブ８の内周面８ａを拘束可能な第１拘束面となる。なお、ガイド部２３ｂの外周面は後述する可動型２４が移動する際のガイド面となり、その外周面精度が可動型２４の動作精度、換言すると軸受スリーブ８の内周面８ａに対するハウジング７外周面（例えばテーパ面７ｃ）の同軸度を直接左右することになるので、求められる同軸度（例えば、３μｍ以下）を確保できるよう高精度に仕上げられている。 The outer peripheral surface 23a2 of the holding portion 23a is set to have an outer diameter that can hold the inner peripheral surface 8a of the bearing sleeve 8 in a state where the bearing sleeve 8 is in contact with the upper end surface 23a1. Therefore, at the time of mold clamping, the outer peripheral surface 23a2 becomes a first constraining surface that can constrain the inner peripheral surface 8a of the bearing sleeve 8. The outer peripheral surface of the guide portion 23b becomes a guide surface when the movable mold 24 described later moves, and the outer peripheral surface accuracy is the operation accuracy of the movable mold 24, in other words, the outer peripheral surface of the housing 7 with respect to the inner peripheral surface 8a of the bearing sleeve 8. Since the coaxiality of the taper surface 7c (for example, the taper surface 7c) directly influences, it is finished with high accuracy so as to ensure the required coaxiality (for example, 3 μm or less).

可動型２４は、上端内周にハウジング７を保持可能な略円筒状に形成されている。この可動型２４は、台座２１に固定されたばね等の弾性体で弾性支持されており、型締め時には、その内周を固定ピン２３のガイド部２３ｂでガイドされた状態で下方に移動する。図６に示す型開きの状態で、可動型２４の上端部は支柱２２の上端面２２ａよりも突出している。可動型２４の下端外径側には、外径寸法が他所よりも大きい大径部２４ｂが設けられ（図５を参照）、これを支柱２２の段部２２ｂと係合させることにより、型開き状態での抜け止めが図られている。可動型２４の上端内周には、ハウジング７のテーパ面７ｃ形状に対応した形状をなしハウジング７を保持する傾斜面状の保持面２４ａが設けられる。この保持面２４ａは、型締め時、保持するハウジング７の外周面（ここではテーパ面７ｃ）を拘束可能な第４拘束面となる。 The movable mold 24 is formed in a substantially cylindrical shape capable of holding the housing 7 on the inner periphery of the upper end. The movable mold 24 is elastically supported by an elastic body such as a spring fixed to the pedestal 21, and moves downward while being guided by the guide portion 23 b of the fixed pin 23 at the time of mold clamping. In the state of the shown to Mold Opening 6, the upper end portion of the movable mold 24 protrudes from the upper end face 22a of the strut 22. On the outer diameter side of the lower end of the movable mold 24, a large diameter portion 24b having an outer diameter dimension larger than that of the other portion is provided (see FIG. 5), and by engaging this with the step portion 22b of the support column 22, the mold opening is performed. It is designed to prevent it from slipping out. On the inner periphery of the upper end of the movable die 24, there is provided an inclined holding surface 24 a that has a shape corresponding to the shape of the tapered surface 7 c of the housing 7 and holds the housing 7. The holding surface 24a serves as a fourth restraining surface capable of restraining the outer peripheral surface (here, the tapered surface 7c) of the housing 7 to be held during mold clamping.

押え型２６は、支柱２２や固定ピン２３、可動型２４に対して相対的に上方に位置し、型締めあるいは型開きに伴い、ピン２５でガイドされた状態で上記支柱２２等に対して上下に相対移動可能なように構成されている。そのため、押え型２６の下端面２６ａは、型締め時、ハウジング７の上端面（動圧発生部Ｂの形成面）を拘束可能な第２拘束面となる。なお、この下端面２６ａは、軸受スリーブ８の下端面８ｃに対するハウジング７の上端面７ｂの平行度、および軸受スリーブ８の内周面８ａに対する上端面７ｂの直角度を直接左右することになるので、平面度や固定ピン２３の上端面２３ａ１に対する平行度、および固定ピン２３の外周面２３ａ２に対する直角度がそれぞれ所定の値以下となるよう高精度に設定されている。   The presser die 26 is positioned relatively above the support 22, the fixed pin 23, and the movable die 24, and is moved up and down with respect to the support 22 and the like while being guided by the pin 25 as the mold is clamped or opened. It is comprised so that relative movement is possible. Therefore, the lower end surface 26a of the presser die 26 becomes a second restraining surface capable of restraining the upper end surface (formation surface of the dynamic pressure generating portion B) of the housing 7 at the time of clamping. The lower end surface 26a directly affects the parallelism of the upper end surface 7b of the housing 7 with respect to the lower end surface 8c of the bearing sleeve 8 and the perpendicularity of the upper end surface 7b with respect to the inner peripheral surface 8a of the bearing sleeve 8. The flatness, the parallelism with respect to the upper end surface 23a1 of the fixing pin 23, and the perpendicularity with respect to the outer peripheral surface 23a2 of the fixing pin 23 are set with high accuracy so as to be equal to or less than predetermined values.

押え型２６のうち、軸受スリーブ８の上端面８ｄと軸方向に対向する一部領域には、押え型２６の下端面２６ａよりも下方（固定ピン２３や可動型２４の側）に突出した押え部材２７が設けられている。この押え部材２７は、上部をばね等の弾性体で支持されており、型締めに伴ってその下端面２７ａが軸受スリーブ８の上端面８ｄに当接すると、下方に対して後退移動する。この際、押え部材２７を支持する弾性体としては、型締め時に軸受スリーブ８に対して過度の負荷を与えることなく、その姿勢（ハウジング７に対する姿勢）を矯正することができる程度の剛性（ばね剛性）を有するものが好適に使用可能である。可動型２４を支持する弾性体にも、同様の剛性を有するものが好適に使用可能である。   Of the presser mold 26, a presser that protrudes below the lower end face 26a of the presser mold 26 (on the fixed pin 23 or the movable mold 24 side) in a partial region facing the upper end surface 8d of the bearing sleeve 8 in the axial direction. A member 27 is provided. The upper portion of the presser member 27 is supported by an elastic body such as a spring. When the lower end surface 27a comes into contact with the upper end surface 8d of the bearing sleeve 8 as the mold is clamped, the presser member 27 moves backward. At this time, the elastic body that supports the pressing member 27 has a rigidity (spring) that can correct the posture (the posture with respect to the housing 7) without applying an excessive load to the bearing sleeve 8 at the time of clamping. Those having rigidity) can be suitably used. As the elastic body that supports the movable mold 24, one having the same rigidity can be suitably used.

以上の構成をなす製造装置２０において、固定ピン２３の保持部２３ａに軸受スリーブ８を保持し、かつ可動型２４の内周（保持面２４ａ）にハウジング７を保持した状態で、押え型２６を支柱２２に対して相対的に下降させ、型締めを行う。この際、接着固定面となるハウジング７の内周面７ａと軸受スリーブ８の外周面８ｂの何れか一方に予め接着剤を塗布しておく。型締めに伴い（押え型２６の下降に伴い）、まず、図７に示すように、
押え型２６の下端面２６ａをハウジング７の上端面７ｂに当接させ、可動型２４と共にハウジング７を下降させる。これにより、ハウジング７が軸受スリーブ８の外周に導入される。さらに、押え型２６を下降させ、押え部材２７の下端面２７ａを軸受スリーブ８の上端面８ｄに当接させることで、軸受スリーブ８の両端面８ｃ、８ｄを保持部２３ａの上端面２３ａ１および押え部材２７の下端面２７ａで挟持する。これにより、軸受スリーブ８が上下方向からの矯正力を受け、保持部２３ａに対する保持姿勢が適正に矯正される。同様に、ハウジング７が下端面２６ａおよび保持面２４ａによって挟持され、これにより押え型２６に対する姿勢が適正に矯正される。そして、押え型２６の下端面２６ａが支柱２２の上端面２２ａに当接した時点で型締めを停止する。 In the manufacturing apparatus 20 having the above configuration, the holding die 26 is held in a state where the bearing sleeve 8 is held by the holding portion 23a of the fixed pin 23 and the housing 7 is held by the inner periphery (holding surface 24a) of the movable die 24. The mold 22 is lowered relative to the column 22 and clamped. At this time, an adhesive is applied in advance to either the inner peripheral surface 7a of the housing 7 or the outer peripheral surface 8b of the bearing sleeve 8 serving as an adhesive fixing surface. As the mold is clamped (as the presser mold 26 is lowered), first, as shown in FIG.
The lower end surface 26 a of the presser die 26 is brought into contact with the upper end surface 7 b of the housing 7, and the housing 7 is lowered together with the movable die 24. As a result, the housing 7 is introduced to the outer periphery of the bearing sleeve 8. Further, the presser die 26 is lowered, and the lower end surface 27a of the presser member 27 is brought into contact with the upper end surface 8d of the bearing sleeve 8, so that both end surfaces 8c and 8d of the bearing sleeve 8 are connected to the upper end surface 23a1 of the holding portion 23a and the presser. The member 27 is clamped by the lower end surface 27a. Thereby, the bearing sleeve 8 receives the correction force from the vertical direction, and the holding posture with respect to the holding portion 23a is corrected appropriately. Similarly, the housing 7 is sandwiched between the lower end surface 26a and the holding surface 24a, whereby the posture with respect to the presser mold 26 is properly corrected. Then, when the lower end surface 26 a of the presser mold 26 comes into contact with the upper end surface 22 a of the support column 22, the mold clamping is stopped.

この場合、押え型２６の下端面２６ａの、固定ピン２３の保持部２３ａの上端面２３ａ１に対する平行度を所定の精度に形成しておくことにより、型締めを完了した時点（図７を参照）では、ハウジング７の上端面７ｂを拘束する押え型２６の下端面２６ａ（第２拘束面）と、軸受スリーブ８の下端面８ｃを拘束する固定ピン２３の上端面２３ａ１（第３拘束面）との間の平行度が高精度に管理された状態となる。そのため、下端面２６ａ（第２拘束面）に拘束されるハウジング７の上端面７ｂと、上端面２３ａ１（第３拘束面）に拘束される軸受スリーブ８の下端面８ｃとの間で高い平行度を有した状態で、ハウジング７に対する軸受スリーブ８の固定姿勢を決定することができる。 In this case, when the mold clamping is completed by forming the parallelism of the lower end surface 26a of the holding die 26 with respect to the upper end surface 23a1 of the holding portion 23a of the fixing pin 23 with a predetermined accuracy (see FIG. 7). Then, the lower end surface 26a (second constraining surface) of the presser die 26 that constrains the upper end surface 7b of the housing 7, and the upper end surface 23a1 ( third constraining surface) of the fixing pin 23 that constrains the lower end surface 8c of the bearing sleeve 8. The degree of parallelism between is controlled with high accuracy. Therefore, high parallelism between the upper end surface 7b of the housing 7 constrained by the lower end surface 26a (second constraining surface) and the lower end surface 8c of the bearing sleeve 8 constrained by the upper end surface 23a1 ( third constraining surface). In this state, the fixed posture of the bearing sleeve 8 with respect to the housing 7 can be determined.

また、この実施形態では、型締め時、固定ピン２３の上端面２３ａ１と押え型２６の下端面２６ａとが所定の軸方向寸法ｔだけ離隔するように管理しているので、上記平行度と同時に、ハウジング７の上端面７ｂと軸受スリーブ８の下端面８ｃとの間の軸方向間隔も高精度に管理することができる。   In this embodiment, at the time of mold clamping, the upper end surface 23a1 of the fixing pin 23 and the lower end surface 26a of the presser mold 26 are managed so as to be separated by a predetermined axial dimension t. The axial distance between the upper end surface 7b of the housing 7 and the lower end surface 8c of the bearing sleeve 8 can also be managed with high accuracy.

また、上述のように、軸受スリーブ８をハウジング７内周にすき間接着で固定することで、接着固定される軸受スリーブ８の外周面８ｂ（あるいはハウジング７の内周面７ａ）には、それほど高い形状精度（面精度）を必要としない。そのため、この実施形態のように、軸受スリーブ８を圧粉成形および焼結で形成（焼結金属で形成）すれば、外周面８ｂ以外の面、すなわち両端面８ｃ、８ｄと内周面８ａとの間の直角度を比較的高精度に仕上げることができる。これにより、上記下端面８ｃと上端面７ｂとの間の平行度が高精度管理されると共に、ハウジング７の上端面７ｂと軸受スリーブ８の内周面８ａとの間の直角度を高精度に管理することができる。   Further, as described above, by fixing the bearing sleeve 8 to the inner periphery of the housing 7 by gap bonding, the outer peripheral surface 8b of the bearing sleeve 8 to be bonded and fixed (or the inner peripheral surface 7a of the housing 7) is so high. Does not require shape accuracy (surface accuracy). Therefore, if the bearing sleeve 8 is formed by compacting and sintering (formed of sintered metal) as in this embodiment, surfaces other than the outer peripheral surface 8b, that is, both end surfaces 8c and 8d and the inner peripheral surface 8a Can be finished with relatively high accuracy. Thereby, the parallelism between the lower end surface 8c and the upper end surface 7b is managed with high accuracy, and the perpendicularity between the upper end surface 7b of the housing 7 and the inner peripheral surface 8a of the bearing sleeve 8 is highly accurate. Can be managed.

特に、この実施形態のように、軸受スリーブ８の内周面８ａおよび下端面８ｃに、動圧発生部として複数本の動圧溝８ａ１、８ｃ１等が形成されている場合、これらの動圧溝は、通常焼結後の溝サイジング工程で設けられる。そのため、かかる溝サイジングにより動圧溝８ａ１、８ａ２、８ｃ１を形成すると共に、下端面８ｃと内周面８ａとの間の直角度を高精度に仕上げることができ、上記直角度を高精度に、かつ最小限の後加工で安価に仕上げることができる。   In particular, when a plurality of dynamic pressure grooves 8a1, 8c1 and the like are formed as dynamic pressure generating portions on the inner peripheral surface 8a and the lower end surface 8c of the bearing sleeve 8 as in this embodiment, these dynamic pressure grooves Is usually provided in the groove sizing step after sintering. Therefore, the dynamic pressure grooves 8a1, 8a2, 8c1 can be formed by such groove sizing, and the perpendicularity between the lower end surface 8c and the inner peripheral surface 8a can be finished with high accuracy. And it can be finished inexpensively with minimal post-processing.

また、この実施形態では、可動型２４は同軸配置された固定ピン２３の外周でガイドされながら移動可能であるから、ハウジング７の第４拘束面となる可動型２４の保持面２４ａと、軸受スリーブ８の第１拘束面となる固定ピン２３の保持部２３ａの外周面２３ａ２との間の同軸度を高精度に管理することができる。従って、これら拘束面により軸受スリーブ８の内周面８ａに対するハウジング７の外周面（テーパ面７ｃ）の同軸度も高精度に管理することができる。 In this embodiment, the movable die 24 is movable while being guided by the outer periphery of the fixed pin 23 arranged coaxially. Therefore, the holding surface 24a of the movable die 24 serving as the fourth constraining surface of the housing 7, and the bearing sleeve The coaxiality with the outer peripheral surface 23a2 of the holding portion 23a of the fixing pin 23 serving as the first restraining surface 8 can be managed with high accuracy. Accordingly, the concentricity of the outer peripheral surface (tapered surface 7c) of the housing 7 with respect to the inner peripheral surface 8a of the bearing sleeve 8 can be managed with high accuracy by these constraining surfaces.

上述のようにして、ハウジング７に対する軸受スリーブ８の固定姿勢および固定位置を決定した後、加熱等により接着剤を固化させる。接着剤の固化後、型開きを行うことで、ハウジング７と軸受スリーブ８の組み付け品が得られる。なお、両者の固定は、上述のよ
うに予め両部材７、８の何れかの面７ａ、８ｂに接着剤を塗布した状態で型締めを行う他、型締め後、両部材７、８間の接着隙間に接着剤を充填・固化させることによって行うこともできる。 After determining the fixing posture and fixing position of the bearing sleeve 8 with respect to the housing 7 as described above, the adhesive is solidified by heating or the like. An assembly of the housing 7 and the bearing sleeve 8 is obtained by performing mold opening after the adhesive is solidified. In addition, as for both fixation, in addition to performing mold clamping in the state which applied the adhesive agent to either surface 7a, 8b of both members 7 and 8 beforehand as mentioned above, after mold clamping, between both members 7 and 8 It can also be performed by filling and solidifying the adhesive in the adhesive gap.

以上のように構成された動圧軸受装置１は、ハウジング７の内周に軸受スリーブ８を固定した後、軸受スリーブ８の内周に回転部材３を挿入した状態で回転部材３の下端にフランジ部１１を固定し、さらに蓋部材１０でハウジング７の下端開口部を封口することで組み立てられる。その後、各軸受隙間を含む軸受内部空間に潤滑油を注油することで、図２に示す動圧軸受装置１が完成する。   In the hydrodynamic bearing device 1 configured as described above, the bearing sleeve 8 is fixed to the inner periphery of the housing 7, and then the rotating member 3 is inserted into the inner periphery of the bearing sleeve 8 with a flange at the lower end of the rotating member 3. It is assembled by fixing the part 11 and sealing the lower end opening of the housing 7 with the lid member 10. Thereafter, lubricating oil is injected into the bearing internal space including each bearing gap, whereby the hydrodynamic bearing device 1 shown in FIG. 2 is completed.

上記構成の動圧軸受装置１において、回転部材３（軸部２）が回転すると、軸受スリーブ８の内周面８ａに形成された動圧発生部Ａ、Ａは、対向する軸部２の外周面２ａとの間にラジアル軸受隙間を形成する。そして、各ラジアル軸受隙間の潤滑油が動圧溝８ａ１、８ａ２の軸方向中心側に押し込まれ、その圧力が上昇する。このように、動圧溝８ａ１、８ａ２（動圧発生部Ａ、Ａ）によって生じる潤滑油の動圧作用によって、軸部２をラジアル方向に非接触支持する第１ラジアル軸受部Ｒ１と第２ラジアル軸受部Ｒ２とがそれぞれ構成される。   In the dynamic pressure bearing device 1 having the above-described configuration, when the rotating member 3 (shaft portion 2) rotates, the dynamic pressure generating portions A and A formed on the inner peripheral surface 8a of the bearing sleeve 8 are the outer periphery of the opposing shaft portion 2. A radial bearing gap is formed between the surface 2a. Then, the lubricating oil in each radial bearing gap is pushed into the axial center side of the dynamic pressure grooves 8a1 and 8a2, and the pressure rises. As described above, the first radial bearing R1 and the second radial that support the shaft portion 2 in a non-contact manner in the radial direction by the dynamic pressure action of the lubricating oil generated by the dynamic pressure grooves 8a1 and 8a2 (dynamic pressure generating portions A and A). Each of the bearing portions R2 is configured.

これと同時に、軸受スリーブ８の下端面８ｃに設けられた動圧発生部Ｃ（動圧溝８ｃ１形成領域）とこれに対向するフランジ部２ｂの上端面２ｂ１との間のスラスト軸受隙間、およびハウジング７の上端面７ｂに形成される動圧発生部Ｂ（動圧溝７ｂ１形成領域）とこれに対向するハブ部９の下端面９ａ１との間のスラスト軸受隙間に形成される潤滑油膜の圧力が、動圧溝７ｂ１、８ｃ１の動圧作用により高められる。そして、これら油膜の圧力によって、回転部材３（ハブ部９）をスラスト方向に非接触支持する第１スラスト軸受部Ｔ１と第２スラスト軸受部Ｔ２とがそれぞれ構成される。   At the same time, the thrust bearing gap between the dynamic pressure generating portion C (the dynamic pressure groove 8c1 forming region) provided on the lower end surface 8c of the bearing sleeve 8 and the upper end surface 2b1 of the flange portion 2b facing this, and the housing The pressure of the lubricating oil film formed in the thrust bearing gap between the dynamic pressure generating portion B (dynamic pressure groove 7b1 forming region) formed on the upper end surface 7b of the roller 7 and the lower end surface 9a1 of the hub portion 9 opposed thereto is The dynamic pressure grooves 7b1 and 8c1 increase the dynamic pressure action. The first thrust bearing portion T1 and the second thrust bearing portion T2 that support the rotating member 3 (hub portion 9) in the thrust direction in a non-contact manner are constituted by the pressure of these oil films.

この際、上述のように、ハウジング７の上端面７ｂと軸受スリーブ８の下端面８ｃとの間の平行度とその軸方向離間距離、ハウジング７の上端面７ｂと軸受スリーブ８の内周面８ａとの間の直角度、およびハウジング７の外周面（テーパ面７ｃ）と軸受スリーブ８の内周面８ａとの間の同軸度などを高精度に設定した状態で接着固定を行うことで、各軸受隙間の幅、あるいはモータの駆動部となるさせたステータコイル４とロータマグネット５との対向間隔等を高精度に管理することができる。従って、軸受性能に優れた動圧軸受装置１ひいては回転性能に優れたスピンドルモータを得ることができる。   At this time, as described above, the parallelism between the upper end surface 7b of the housing 7 and the lower end surface 8c of the bearing sleeve 8 and the axial separation distance thereof, the upper end surface 7b of the housing 7 and the inner peripheral surface 8a of the bearing sleeve 8 are used. And fixing with a high degree of accuracy such as the coaxiality between the outer peripheral surface (tapered surface 7c) of the housing 7 and the inner peripheral surface 8a of the bearing sleeve 8, The width of the bearing gap or the interval between the stator coil 4 and the rotor magnet 5 that serve as the motor drive unit can be managed with high accuracy. Therefore, it is possible to obtain a hydrodynamic bearing device 1 having excellent bearing performance and thus a spindle motor having excellent rotational performance.

なお、以上の説明では、軸受スリーブ８とハウジング７に対する軸受スリーブ８の固定姿勢の決定を一度の型締め動作で行う手順について説明を行ったが、一度目の型締め動作でまず固定ピン２３（保持部２３ａ）に対する軸受スリーブ８の姿勢矯正を行った後、可動型２４にハウジング７をセットして、二度目の型締め動作で両者間の固定姿勢を決定することもできる。   In the above description, the procedure for determining the fixing posture of the bearing sleeve 8 with respect to the bearing sleeve 8 and the housing 7 has been described in a single mold clamping operation. However, the fixing pin 23 ( After correcting the attitude of the bearing sleeve 8 with respect to the holding portion 23a), the housing 7 is set on the movable mold 24, and the fixed attitude between the two can be determined by the second clamping operation.

以下、本発明の第２実施形態に係る動圧軸受装置の製造方法およびそれにより製造された動圧軸受装置を図面に基づいて説明する。   Hereinafter, a method for manufacturing a hydrodynamic bearing device according to a second embodiment of the present invention and a hydrodynamic bearing device manufactured thereby will be described with reference to the drawings.

図８は、第２実施形態に係る製造方法により製造される動圧軸受装置１の一例を示している。この動圧軸受装置１は、主に、ハウジング７が有底筒状に形成される点、およびハブ部９の下端面９ａ１とハウジング７の上端面７ｂの間にのみスラスト軸受部Ｔが設けられる点で、図２に示す動圧軸受装置１と構成を異にしている。なお、その他の構成は図２に示す動圧軸受装置と同一であるので、共通の参照番号を付与して重複説明を省略する。   FIG. 8 shows an example of the hydrodynamic bearing device 1 manufactured by the manufacturing method according to the second embodiment. The hydrodynamic bearing device 1 is mainly provided with a thrust bearing portion T only at a point where the housing 7 is formed in a bottomed cylindrical shape and between the lower end surface 9a1 of the hub portion 9 and the upper end surface 7b of the housing 7. In this respect, the configuration is different from that of the hydrodynamic bearing device 1 shown in FIG. In addition, since the other structure is the same as that of the hydrodynamic bearing device shown in FIG. 2, a common reference number is given and redundant description is omitted.

同図に示す動圧軸受装置１におけるハウジング７と軸受スリーブ８の組み付け（接着固
定）は、例えば図９に示す製造装置３０を用いて行われる。 The assembly (adhesion and fixing) of the housing 7 and the bearing sleeve 8 in the dynamic pressure bearing device 1 shown in the figure is performed using, for example, a manufacturing device 30 shown in FIG.

図９に示す製造装置３０は、水平配置された台座３１に固定された固定ピン３３と、固定ピン３３の外周に配置され、固定ピン３３に対して相対的に上下移動が可能な押え型３６とを備える。なお、説明の便宜上、台座３１の側を下側、押え型３６の側を上側として以下説明を進める。   The manufacturing apparatus 30 shown in FIG. 9 includes a fixing pin 33 fixed to a horizontally arranged pedestal 31 and a presser mold 36 that is disposed on the outer periphery of the fixing pin 33 and that can move up and down relatively with respect to the fixing pin 33. With. For convenience of explanation, the following explanation will be made with the pedestal 31 side as the lower side and the presser die 36 side as the upper side.

固定ピン３３は、図９に示すように、軸受スリーブ８の保持部３３ａと、保持部３３ａよりも大径に形成されたガイド部３３ｂとを備える。ガイド部３３ｂの下端は台座３１に固定されている。保持部３３ａは軸受スリーブ８を保持、拘束するためのものであり、円筒状の外周面３３ａ２と、外周面３３ａ２の下端から外径側に広がる円環状の上端面３３ａ１とを有する。また、この実施形態では、保持部３３ａの外周面３３ａ２と上端面３３ａ１との間に段部３３ｃが設けられており、段部３３ｃの小径上端面３３ｃ１と、保持部３３ａの上端面３３ａ１との軸方向間隔が所定値に管理されている。   As shown in FIG. 9, the fixing pin 33 includes a holding portion 33a of the bearing sleeve 8 and a guide portion 33b formed to have a larger diameter than the holding portion 33a. The lower end of the guide portion 33 b is fixed to the pedestal 31. The holding portion 33a is for holding and restraining the bearing sleeve 8, and has a cylindrical outer peripheral surface 33a2 and an annular upper end surface 33a1 extending from the lower end of the outer peripheral surface 33a2 to the outer diameter side. In this embodiment, a step portion 33c is provided between the outer peripheral surface 33a2 and the upper end surface 33a1 of the holding portion 33a, and the small diameter upper end surface 33c1 of the step portion 33c and the upper end surface 33a1 of the holding portion 33a are provided. The axial interval is managed at a predetermined value.

この場合、保持部３３ａの外周面３３ａ２が、型締め時、軸受スリーブ８の内周面８ａを拘束可能な第１拘束面となる。また、保持部３３ａの上端面３３ａ１が、型締め時、ハウジング７の上端面７ｂを拘束可能な第２拘束面となる。なお、この上端面３３ａ１および外周面３３ａ２は、軸受スリーブ８の内周面８ａに対するハウジング７の上端面７ｂとの間の直角度を直接左右することになるので、かかる上端面３３ａ１に対する外周面３３ａ２の直角度が所定の値以下となるよう高精度に設定されている。 In this case, the outer peripheral surface 33a2 of the holding portion 33a serves as a first constraining surface that can constrain the inner peripheral surface 8a of the bearing sleeve 8 during mold clamping . Also, the upper end surface 33a1 of the holding portion 33a is, at mold clamping, the second constraining surface can be restrained to the upper end face 7b of the housing 7. The upper end surface 33a1 and the outer peripheral surface 33a2 directly affect the perpendicularity between the inner peripheral surface 8a of the bearing sleeve 8 and the upper end surface 7b of the housing 7. Therefore, the outer peripheral surface 33a2 with respect to the upper end surface 33a1. Is set with high accuracy so that the squareness of the angle is equal to or less than a predetermined value.

同様に、ガイド部３３ｂの外周面は後述する押え型３６が移動する際のガイド面となり、その外周面精度が、軸受スリーブ８の内周面８ａに対するハウジング７外周面（例えばテーパ面７ｃ）の同軸度を直接左右することになるので、求められる同軸度を確保できるよう高精度に仕上げられている。   Similarly, the outer peripheral surface of the guide portion 33b becomes a guide surface when the presser die 36 described later moves, and the outer peripheral surface accuracy of the outer peripheral surface of the housing 7 with respect to the inner peripheral surface 8a of the bearing sleeve 8 (for example, the tapered surface 7c). Since the coaxiality directly affects the coaxiality, it is finished with high accuracy so that the required coaxiality can be secured.

押え型３６は、その内周に固定ピン３３の保持部３３ａを収容可能な小径面３６ａと、固定ピン３３のガイド部３３ｂを収容可能な大径面３６ｂとを有する。このうち小径面３６ａの下端には、ハウジング７のテーパ面７ｃ形状に対応した形状をなしハウジング７を下方に押圧可能な傾斜面３６ａ１が設けられる。かかる構成の押え型３６は、台座３１や固定ピン３３に対して相対的に上方に位置し、型締めあるいは型開きに伴い、固定ピン３３に対して相対的に上下移動が可能なように構成されている。そのため、小径面３６ａに設けられた傾斜面３６ａ１は、型締め時、ハウジング７の外周面（ここではテーパ面７ｃ）を拘束可能な第４拘束面となる。なお、この傾斜面３６ａ１は、軸受スリーブ８の内周面８ａに対するハウジング７の外周面（テーパ面７ｃ）の同軸度を直接左右することになるので、固定ピン３３の外周面３３ａ２に対する同軸度が所定の値以下となるよう高精度に設定されている。 The presser die 36 has a small diameter surface 36 a capable of accommodating the holding portion 33 a of the fixing pin 33 and a large diameter surface 36 b capable of accommodating the guide portion 33 b of the fixing pin 33 on the inner periphery thereof. Among these, the lower end of the small diameter surface 36a is provided with an inclined surface 36a1 that has a shape corresponding to the shape of the tapered surface 7c of the housing 7 and can press the housing 7 downward. The presser mold 36 having such a configuration is positioned relatively above the pedestal 31 and the fixed pin 33, and can be moved up and down relatively with respect to the fixed pin 33 when the mold is clamped or opened. Has been. Therefore, the inclined surface 36a1 provided on the small-diameter surface 36a serves as a fourth constraining surface capable of constraining the outer peripheral surface (here, the tapered surface 7c) of the housing 7 during mold clamping. Since the inclined surface 36a1 directly affects the coaxiality of the outer peripheral surface (tapered surface 7c) of the housing 7 with respect to the inner peripheral surface 8a of the bearing sleeve 8, the coaxiality with respect to the outer peripheral surface 33a2 of the fixing pin 33 is determined. It is set with high accuracy so as to be below a predetermined value.

以上の構成をなす製造装置３０を用いた接着固定作業は以下の手順で行われる。まず、固定ピン３３の保持部３３ａ外周に軸受スリーブ８を導入し、軸受スリーブ８の上端面８ｄ（図９中では下方に位置している）を保持部３３ａの上端面３３ａ１に当接させた状態でかかる軸受スリーブ８を保持する。次に、ハウジング７を、軸受スリーブ８を被覆するように保持部３３ａにセットする。この状態から、押え型３６を台座３１および固定ピン３３に対して相対的に下降させ、型締めを行う。この際、接着固定面となるハウジング７の内周面７ａと軸受スリーブ８の外周面８ｂの何れか一方に予め接着剤を塗布しておく。型締めに伴い（押え型３６の下降に伴い）、図９に示すように、押え型３６の小径面３６ａに設けた傾斜面３６ａ１をハウジング７の外周面（テーパ面７ｃ）に当接させ、ハウジング７を、かかる傾斜面３６ａ１と固定ピン３３の上端面３３ａ１とで挟持する。これに
より、ハウジング７が上下方向からの矯正力を受け、保持部３３ａに対する保持姿勢が適正に矯正される。そして、押え型２６の下端面２６ａが支柱２２の上端面２２ａに当接した時点で型締めを停止する。 The bonding and fixing work using the manufacturing apparatus 30 having the above configuration is performed according to the following procedure. First, the bearing sleeve 8 is introduced to the outer periphery of the holding portion 33a of the fixing pin 33, and the upper end surface 8d (positioned downward in FIG. 9) of the bearing sleeve 8 is brought into contact with the upper end surface 33a1 of the holding portion 33a. The bearing sleeve 8 is held in the state. Next, the housing 7 is set on the holding portion 33 a so as to cover the bearing sleeve 8. From this state, the presser mold 36 is lowered relative to the pedestal 31 and the fixing pin 33 to perform mold clamping. At this time, an adhesive is applied in advance to either the inner peripheral surface 7a of the housing 7 or the outer peripheral surface 8b of the bearing sleeve 8 serving as an adhesive fixing surface. As the mold is clamped (with the lowering of the presser mold 36), as shown in FIG. 9, the inclined surface 36a1 provided on the small diameter surface 36a of the presser mold 36 is brought into contact with the outer peripheral surface (tapered surface 7c) of the housing 7, The housing 7 is sandwiched between the inclined surface 36 a 1 and the upper end surface 33 a 1 of the fixing pin 33. Thereby, the housing 7 receives a correction force from the vertical direction, and the holding posture with respect to the holding portion 33a is corrected appropriately. Then, when the lower end surface 26 a of the presser mold 26 comes into contact with the upper end surface 22 a of the support column 22, the mold clamping is stopped.

この場合、上端面３３ａ１に対する外周面３３ａ２の直角度を所定の精度に形成しておくことにより、軸受スリーブ８の内周面８ａを拘束する固定ピン２３の外周面３３ａ２（第１拘束面）と、ハウジング７の上端面７ｂを拘束する固定ピン３３の上端面３３ａ１（第２拘束面）との間の直角度が高精度に管理された状態で型締めを行うことができる。そのため、外周面３３ａ２（第１拘束面）に拘束される軸受スリーブ８の内周面８ａと、上端面３３ａ１（第２拘束面）に拘束されるハウジング７の上端面７ｂとの間で高い直角度が得られるように、ハウジング７に対する軸受スリーブ８の固定姿勢を決定することができる。   In this case, by forming the squareness of the outer peripheral surface 33a2 with respect to the upper end surface 33a1 with a predetermined accuracy, the outer peripheral surface 33a2 (first constraining surface) of the fixing pin 23 that constrains the inner peripheral surface 8a of the bearing sleeve 8 and The mold clamping can be performed in a state in which the squareness between the upper end surface 33a1 (second constraining surface) of the fixing pin 33 that constrains the upper end surface 7b of the housing 7 is managed with high accuracy. Therefore, there is a high straight line between the inner peripheral surface 8a of the bearing sleeve 8 constrained by the outer peripheral surface 33a2 (first constraining surface) and the upper end surface 7b of the housing 7 constrained by the upper end surface 33a1 (second constraining surface). The fixing posture of the bearing sleeve 8 with respect to the housing 7 can be determined so that an angle is obtained.

また、この実施形態では、保持部３３ａの上端面３３ａ１と段部３３ｃの小径上端面３３ｃ１とが所定の軸方向寸法だけ離隔するように固定ピン３３を仕上げているので、ハウジング７の上端面７ｂと軸受スリーブ８の上端面８ｄとの間の軸方向間隔も高精度に管理することができる。   Further, in this embodiment, since the fixing pin 33 is finished so that the upper end surface 33a1 of the holding portion 33a and the small diameter upper end surface 33c1 of the stepped portion 33c are separated by a predetermined axial dimension, the upper end surface 7b of the housing 7 is finished. And the axial distance between the upper end surface 8d of the bearing sleeve 8 can be managed with high accuracy.

また、この実施形態では、押え型３６は同軸配置された固定ピン３３（ガイド部３３ｂ）の外周でガイドされながら移動可能であるから、ハウジング７の第４拘束面となる押え型３６の傾斜面３６ａ１と、軸受スリーブ８の第１拘束面となる保持部３３ａの外周面３３ａ２との間の同軸度を高精度に管理することができる。従って、これら拘束面により軸受スリーブ８の内周面８ａに対するハウジング７の外周面（テーパ面７ｃ）の同軸度も高精度に管理することができる。 Further, in this embodiment, since the presser mold 36 is movable while being guided on the outer periphery of the fixed pin 33 (guide portion 33 b) arranged coaxially, the inclined surface of the presser mold 36 serving as the fourth restraining surface of the housing 7. The coaxiality between 36a1 and the outer peripheral surface 33a2 of the holding portion 33a that becomes the first restraining surface of the bearing sleeve 8 can be managed with high accuracy. Accordingly, the concentricity of the outer peripheral surface (tapered surface 7c) of the housing 7 with respect to the inner peripheral surface 8a of the bearing sleeve 8 can be managed with high accuracy by these constraining surfaces.

上述のようにして、ハウジング７に対する軸受スリーブ８の固定姿勢および固定位置を決定した後、加熱等により接着剤を固化させる。接着剤の固化後、型開きを行うことで、ハウジング７と軸受スリーブ８の組み付け品が得られる。   After determining the fixing posture and fixing position of the bearing sleeve 8 with respect to the housing 7 as described above, the adhesive is solidified by heating or the like. An assembly of the housing 7 and the bearing sleeve 8 is obtained by performing mold opening after the adhesive is solidified.

以上、本発明の第１、第２実施形態について説明したが、本発明は、これらの実施形態に限られるものではなく、本発明の作用効果を享受し得る範囲内において、製造装置２０、３０の構成など種々の変更等が可能である。   As mentioned above, although 1st, 2nd embodiment of this invention was described, this invention is not restricted to these embodiment, In the range which can enjoy the effect of this invention, manufacturing apparatus 20 and 30 Various changes, such as the configuration of, can be made.

上記の動圧軸受装置１では、ラジアル軸受部Ｒ１、Ｒ２として、へリングボーン形状やスパイラル形状の動圧溝により流体の動圧作用を発生させる構成を例示しているが、ラジアル軸受部Ｒ１、Ｒ２として、いわゆる多円弧軸受やステップ軸受を採用しても良い。この場合、軸受スリーブ８の内周面８ａに形成される動圧発生部Ａは、複数の円弧面あるいは軸方向溝によって構成される。また、上述の動圧発生部は、軸受スリーブ８の内周面８ａに限らず、これとラジアル方向に対向する軸部２の外周面２ａの側に形成することも可能である。   In the hydrodynamic bearing device 1 described above, the radial bearing portions R1 and R2 exemplify a configuration in which the dynamic pressure action of the fluid is generated by the herringbone-shaped or spiral-shaped hydrodynamic grooves, but the radial bearing portions R1, R2 A so-called multi-arc bearing or step bearing may be adopted as R2. In this case, the dynamic pressure generating portion A formed on the inner peripheral surface 8a of the bearing sleeve 8 is constituted by a plurality of arc surfaces or axial grooves. Further, the above-described dynamic pressure generating portion is not limited to the inner peripheral surface 8a of the bearing sleeve 8, but can be formed on the outer peripheral surface 2a side of the shaft portion 2 facing this in the radial direction.

また、図示は省略するが、スラスト軸受部Ｔ１およびＴ２のうち一方又は双方は、例えば、スラスト軸受面となる領域に、複数の半径方向溝形状の動圧溝を円周方向所定間隔に設けた、いわゆるステップ軸受、いわゆる波型軸受（ステップ型が波型になったもの）等で構成することもできる。これらスラスト動圧軸受を構成する動圧発生部（図２でいえば動圧発生部Ｂ、Ｃなど）についても、軸受スリーブ８やハウジング７の側ではなく、これと対向するフランジ部１１やハブ部９の下端面９ａ１の側に設けることも可能である。   Although illustration is omitted, one or both of the thrust bearing portions T1 and T2 is provided with a plurality of radial groove-shaped dynamic pressure grooves at predetermined intervals in the circumferential direction, for example, in a region serving as a thrust bearing surface. Further, it can be constituted by a so-called step bearing, a so-called wave bearing (the step mold is a wave form), or the like. The dynamic pressure generating portions (the dynamic pressure generating portions B and C in FIG. 2) constituting these thrust dynamic pressure bearings are not on the bearing sleeve 8 or housing 7 side, but on the flange portion 11 or hub facing the same. It can also be provided on the lower end surface 9a1 side of the portion 9.

以上の実施形態では、動圧軸受装置１の内部に充満する流体（潤滑流体）として、潤滑油を例示したが、それ以外にも各軸受隙間に動圧を発生させることができる流体、例えば
磁性流体や空気等の気体を使用することもできる。 In the above embodiment, the lubricating oil is exemplified as the fluid (lubricating fluid) that fills the inside of the hydrodynamic bearing device 1, but other fluids that can generate dynamic pressure in each bearing gap, such as magnetic Gases such as fluid and air can also be used.

本発明の第１実施形態に係る製造方法により製造された動圧軸受装置を組み込んだスピンドルモータの一例を示す断面図である。It is sectional drawing which shows an example of the spindle motor incorporating the dynamic pressure bearing apparatus manufactured by the manufacturing method which concerns on 1st Embodiment of this invention. 動圧軸受装置の断面図である。It is sectional drawing of a hydrodynamic bearing apparatus. （ａ）は軸受スリーブの断面図、（ｂ）は軸受スリーブの下端面図である。(A) is sectional drawing of a bearing sleeve, (b) is a lower end figure of a bearing sleeve. ハウジングの上端面図である。It is a top view of a housing. 第１実施形態に係る製造工程の一例を概念的に示す断面図である。It is sectional drawing which shows notionally an example of the manufacturing process which concerns on 1st Embodiment. 型締め前の、製造装置の矢印Ｄで示す領域を拡大した断面図である。It is sectional drawing to which the area | region shown by the arrow D of a manufacturing apparatus before mold clamping was expanded. 型締め時の、製造装置の要部を拡大した断面図である。It is sectional drawing to which the principal part of the manufacturing apparatus was expanded at the time of mold clamping. 第２実施形態に係る製造方法により製造された動圧軸受装置の断面図である。It is sectional drawing of the hydrodynamic bearing apparatus manufactured by the manufacturing method which concerns on 2nd Embodiment. 第２実施形態に係る製造工程の一例を概念的に示す断面図である。It is sectional drawing which shows notionally an example of the manufacturing process which concerns on 2nd Embodiment.

１ 動圧軸受装置
７ ハウジング
７ｂ 上端面
７ｃ テーパ面
８ 軸受スリーブ
８ａ 内周面
８ｃ 下端面
２０ 製造装置
２３ 固定ピン
２３ａ 保持部
２３ａ１ 上端面（第３拘束面）
２６ 押え型
２６ａ 下端面（第２拘束面）
３０ 製造装置
３３ 固定ピン
３３ａ 保持部
３３ａ１ 上端面（第２拘束面）
３３ａ２ 外周面（第１拘束面）
３６ 押え型
Ａ、Ｂ、Ｃ 動圧発生部
Ｒ１、Ｒ２ ラジアル軸受部
Ｔ１、Ｔ２、Ｔ スラスト軸受部
Ｓ シール空間 DESCRIPTION OF SYMBOLS 1 Dynamic pressure bearing apparatus 7 Housing 7b Upper end surface 7c Tapered surface 8 Bearing sleeve 8a Inner peripheral surface 8c Lower end surface 20 Manufacturing apparatus 23 Fixing pin 23a Holding | maintenance part 23a1 Upper end surface ( 3rd restraint surface)
26 Presser mold 26a Lower end surface (second restraint surface)
30 Manufacturing apparatus 33 Fixing pin 33a Holding part 33a1 Upper end surface (2nd restraint surface)
33a2 Outer peripheral surface (first restraint surface)
36 Presser dies A, B, C Dynamic pressure generating portions R1, R2 Radial bearing portions T1, T2, T Thrust bearing portions S Seal space

Claims (4)

内周面がラジアル軸受隙間に面する軸受スリーブを、軸方向一方の端面がスラスト軸受隙間に面するハウジングの内周にすきま接着で固定するに際し、
一対の金型の型締めに伴い軸受スリーブの上記内周面を拘束する第１拘束面を一方の金型に設けると共に、上記型締めに伴いハウジングの上記端面を拘束する第２拘束面を他方の金型に設けて、第１拘束面と第２拘束面との間の直角度を管理するようにし、かつ、
上記型締めに伴い、何れか一方の金型に弾性支持された可動型と第１拘束面とでハウジングおよびハウジングの内周に導入された軸受スリーブを半径方向に挟持すると共に、上記可動型と第２拘束面とでハウジングを軸方向に挟持するようにしたことを特徴とする動圧軸受装置の製造方法。 When fixing the bearing sleeve whose inner circumferential surface faces the radial bearing gap to the inner circumference of the housing whose one end face in the axial direction faces the thrust bearing gap by clearance bonding ,
A first constraining surface that constrains the inner peripheral surface of the bearing sleeve is provided in one mold as the pair of molds are clamped, and a second constraining surface that constrains the end surface of the housing is provided in the other as the mold is clamped. The right angle between the first constraining surface and the second constraining surface is managed , and
Along with the mold clamping, the movable mold elastically supported by one of the molds and the first restraining surface sandwich the housing and the bearing sleeve introduced into the inner periphery of the housing in the radial direction, and the movable mold A method of manufacturing a hydrodynamic bearing device, wherein the housing is clamped in the axial direction with the second restraining surface . 内周面がラジアル軸受隙間に面すると共に、軸方向他方の端面が第１のスラスト軸受隙間に面する軸受スリーブを、軸方向一方の端面が第２のスラスト軸受隙間に面するハウジングの内周にすきま接着で固定するに際し、
一対の金型の型締めに伴い軸受スリーブの上記端面を拘束する第３拘束面を一方の金型に設けると共に、上記型締めに伴いハウジングの上記端面を拘束する第２拘束面を他方の金型に設けて、第２拘束面と第３拘束面との間の平行度を管理するようにし、かつ、
上記型締めに伴い、何れか一方の金型に弾性支持された可動型と第３拘束面とで軸受スリーブを軸方向に挟持すると共に、他方の金型に弾性支持された可動型と第２拘束面とでハウジングを軸方向に挟持するようにしたことを特徴とする動圧軸受装置の製造方法。 Together with the inner circumferential surface facing the radial bearing gap, the bearing sleeve the end face of the other axial faces the first thrust bearing gap, the inner periphery of the housing to one end face in the axial direction faces the second thrust bearing gap When fixing with clearance adhesive ,
A third constraining surface that constrains the end surface of the bearing sleeve is provided in one mold as the pair of molds are clamped, and a second constraining surface that constrains the end surface of the housing as the mold is clamped is provided in the other mold. Provided in the mold to manage parallelism between the second constraining surface and the third constraining surface ; and
Along with the clamping, the movable sleeve elastically supported by one of the molds and the third restraining surface sandwich the bearing sleeve in the axial direction, and the movable mold elastically supported by the other mold and the second mold A method of manufacturing a hydrodynamic bearing device, wherein a housing is clamped in an axial direction with a restraining surface . さらに、上記型締めに伴い軸受スリーブの上記内周面を拘束する第１拘束面を一方の金型に設けて、第１拘束面と第２拘束面との間の直角度を管理するようにし、かつ、
上記型締めに伴い、上記一方の金型に弾性支持された可動型と第１拘束面とでハウジングおよびハウジングの内周に導入された軸受スリーブを半径方向に挟持するようにした請求項２に記載の動圧軸受装置の製造方法。 Further, a first constraining surface that constrains the inner peripheral surface of the bearing sleeve with the mold clamping is provided in one mold so as to manage the perpendicularity between the first constraining surface and the second constraining surface. ,And,
Along with the mold clamping, to claim 2 which is adapted to clamp the bearing sleeve which is introduced into the inner periphery of the housing and the housing by the elastic supported movable die and the first constraining surface on one of the mold the radially The manufacturing method of the hydrodynamic bearing apparatus of description. ハウジングに対する軸受スリーブの固定姿勢を決定した後、接着剤を固化させる請求項１〜３何れかに記載の動圧軸受装置の製造方法。   The method for manufacturing a hydrodynamic bearing device according to any one of claims 1 to 3, wherein an adhesive is solidified after determining a fixing posture of the bearing sleeve with respect to the housing.
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