JP2008051130A5 - - Google Patents

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Publication number
JP2008051130A5
JP2008051130A5 JP2006225067A JP2006225067A JP2008051130A5 JP 2008051130 A5 JP2008051130 A5 JP 2008051130A5 JP 2006225067 A JP2006225067 A JP 2006225067A JP 2006225067 A JP2006225067 A JP 2006225067A JP 2008051130 A5 JP2008051130 A5 JP 2008051130A5
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JP
Japan
Prior art keywords
sleeve
diameter
bearing device
fluid dynamic
circumferential groove
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.)
Granted
Application number
JP2006225067A
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Japanese (ja)
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JP2008051130A (en
JP4829039B2 (en
Filing date
Publication date
Application filed filed Critical
Priority to JP2006225067A priority Critical patent/JP4829039B2/en
Priority claimed from JP2006225067A external-priority patent/JP4829039B2/en
Publication of JP2008051130A publication Critical patent/JP2008051130A/en
Publication of JP2008051130A5 publication Critical patent/JP2008051130A5/ja
Application granted granted Critical
Publication of JP4829039B2 publication Critical patent/JP4829039B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Claims (6)

スリーブと該スリーブに挿通されたシャフトとを含み、前記シャフトを、動圧軸受部を
介して前記スリーブに対して回転自在に支持する構成の流体動圧軸受装置において、
前記スリーブは、貫通孔と、該スリーブの一端部側に形成された該スリーブの外径より
も小径なる第１の径の内周面を有する第１の段部及び前記第１の径よりも小径なる第２の
径の内周面を有する第２の段部と、を有する一方、
前記シャフトの先端部に固定され前記第２の段部に収容されたフランジと、
前記第１の段部に収容されると共に前記貫通孔の前記一端部側を封止し前記スリーブに
接着剤で固着されたスラストプレートと、
前記貫通孔の内周面または前記シャフトの外周面に形成された動圧溝と、
前記スリーブの外周面における前記一端部側に設けられた周溝と、を備え、
該周溝における前記スリーブの他端部側となる端部が、前記動圧溝の前記一端部側の端
部よりも前記一端部側に位置することを特徴とする流体動圧軸受装置。 A fluid dynamic pressure bearing device including a sleeve and a shaft inserted through the sleeve, wherein the shaft is rotatably supported with respect to the sleeve via a dynamic pressure bearing portion;
The sleeve has a through hole, a first step portion having an inner circumferential surface having a first diameter smaller than the outer diameter of the sleeve formed on one end portion side of the sleeve, and the first diameter. A second step portion having an inner peripheral surface of a second diameter which is a small diameter,
A flange fixed to the tip of the shaft and housed in the second step;
A thrust plate housed in the first step and sealing the one end of the through hole and fixed to the sleeve with an adhesive;
A dynamic pressure groove formed on the inner peripheral surface of the through hole or the outer peripheral surface of the shaft;
A circumferential groove provided on the one end side of the outer peripheral surface of the sleeve,
The fluid dynamic bearing device according to claim 1, wherein an end portion of the circumferential groove on the other end side of the sleeve is positioned closer to the one end portion than an end portion on the one end portion side of the dynamic pressure groove. 前記周溝における最小径は、前記第１の径以下であることを特徴とする請求項１記載の
流体動圧軸受装置。 The fluid dynamic bearing device according to claim 1, wherein a minimum diameter of the circumferential groove is equal to or smaller than the first diameter. 前記周溝によって薄肉された前記スリーブの部位で応力の伝播を遮断することを特徴とする請求項１または２に記載の流体動圧軸受装置。  3. The fluid dynamic bearing device according to claim 1, wherein propagation of stress is blocked at a portion of the sleeve thinned by the circumferential groove. 4. 前記スリーブの線膨張係数は、前記スラストプレートの線膨張係数より大きいことを特徴とする請求項１〜３のいずれかに記載の流体動圧軸受装置。  The fluid dynamic bearing device according to claim 1, wherein a linear expansion coefficient of the sleeve is larger than a linear expansion coefficient of the thrust plate. 前記周溝の最小径をＤ１、前記第１の段部の内径をＤ２とすると、−０．１４ｍｍ≦Ｄ１−Ｄ２≦０ｍｍを満たすことを特徴とする請求項１〜４のいずれかに記載の流体動圧軸受装置。  5. The relationship according to claim 1, wherein the minimum diameter of the circumferential groove is D1 and the inner diameter of the first step portion is D2, and satisfies −0.14 mm ≦ D1−D2 ≦ 0 mm. Fluid dynamic bearing device. 請求項１〜請求項５のいずれかに記載の流体動圧軸受装置を備えたモータ。 A motor comprising the fluid dynamic bearing device according to any one of claims 1 to 5 .
JP2006225067A 2006-08-22 2006-08-22 Fluid dynamic bearing device and motor equipped with the same Expired - Fee Related JP4829039B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006225067A JP4829039B2 (en) 2006-08-22 2006-08-22 Fluid dynamic bearing device and motor equipped with the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006225067A JP4829039B2 (en) 2006-08-22 2006-08-22 Fluid dynamic bearing device and motor equipped with the same

Publications (3)

Publication Number Publication Date
JP2008051130A JP2008051130A (en) 2008-03-06
JP2008051130A5 true JP2008051130A5 (en) 2009-08-06
JP4829039B2 JP4829039B2 (en) 2011-11-30

Family

ID=39235389

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006225067A Expired - Fee Related JP4829039B2 (en) 2006-08-22 2006-08-22 Fluid dynamic bearing device and motor equipped with the same

Country Status (1)

Country Link
JP (1) JP4829039B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5717953B2 (en) * 2009-06-02 2015-05-13 サムスン電機ジャパンアドバンスドテクノロジー株式会社 Disk drive
KR101499713B1 (en) * 2011-01-04 2015-03-09 삼성전기주식회사 Motor and driving device of recording disc

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002266861A (en) * 2001-03-05 2002-09-18 Sankyo Seiki Mfg Co Ltd Fluid dynamic pressure bearing device
JP3804565B2 (en) * 2002-03-28 2006-08-02 日本ビクター株式会社 Spindle motor
JP4754794B2 (en) * 2003-09-12 2011-08-24 ミネベア株式会社 Fluid bearing unit, spindle motor having the fluid bearing unit, and recording disk drive
DE202004001200U1 (en) * 2004-01-28 2005-06-09 Minebea Co., Ltd. Hydrodynamic bearing system
DE102004040295B9 (en) * 2004-08-19 2017-07-13 Minebea Co., Ltd. Hydrodynamic bearing arrangement for an electric motor
JP2006136180A (en) * 2004-11-09 2006-05-25 Matsushita Electric Ind Co Ltd Spindle motor

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