JPH02184236A - Hermetic dynamic pressure fluid bearing motor - Google Patents
Hermetic dynamic pressure fluid bearing motorInfo
- Publication number
- JPH02184236A JPH02184236A JP33341488A JP33341488A JPH02184236A JP H02184236 A JPH02184236 A JP H02184236A JP 33341488 A JP33341488 A JP 33341488A JP 33341488 A JP33341488 A JP 33341488A JP H02184236 A JPH02184236 A JP H02184236A
- Authority
- JP
- Japan
- Prior art keywords
- case
- hydrodynamic bearing
- sealed
- motor
- shaft member
- 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.)
- Pending
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 19
- 238000004891 communication Methods 0.000 claims abstract description 28
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 239000003822 epoxy resin Substances 0.000 claims abstract description 9
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 9
- 239000003566 sealing material Substances 0.000 claims description 12
- 239000004698 Polyethylene Substances 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000009833 condensation Methods 0.000 abstract description 7
- 230000005494 condensation Effects 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000000853 adhesive Substances 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 10
- 230000006866 deterioration Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 241001590997 Moolgarda engeli Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Sliding-Contact Bearings (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、偏向走査モータなどに見られるごとく、密封
ケース内に設けた動圧流体軸受で回転多面鏡などの回転
体を軸支する密封型動圧流体軸受モータに関する。[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to a sealed device that pivotally supports a rotating body such as a rotating polygon mirror using a hydrodynamic bearing provided in a sealed case, as seen in deflection scanning motors. The present invention relates to a dynamic pressure fluid bearing motor.
レーザービームプリンタ等で回転多面鏡を回転駆動する
偏光走査モータは、特に温度変化が激しい場合でも回転
ムラを少なくすることが要請され、このための回転体軸
受部は高い精度が要求される。A polarization scanning motor that rotationally drives a rotating polygon mirror in a laser beam printer or the like is required to reduce rotational unevenness, especially when temperature changes are severe, and the rotating body bearing for this purpose is required to have high precision.
一方、高い軸受精度を確保する手段としては、例えば、
回転体によって発生する流体の動圧で回転体を軸支する
動圧流体軸受が使用されている。On the other hand, as a means to ensure high bearing accuracy, for example,
Dynamic pressure fluid bearings are used that support a rotating body using the dynamic pressure of fluid generated by the rotating body.
このような動圧流体軸受を用いた偏光走査モータは、ホ
コリや湿気に弱いため外部とモータ内部とを遮断するこ
とが要請され、そのためモータケースを密封構造とした
密封型動圧流体軸受モータが使用されている。Polarization scanning motors using such dynamic pressure fluid bearings are susceptible to dust and moisture, so it is required to isolate the outside from the inside of the motor. Therefore, sealed type fluid dynamic bearing motors with a sealed motor case are required. It is used.
しかし、従来の密封型動圧流体軸受モータにあっては、
外部からのホコリ等を遮断することは可能であるが、次
のような問題があった。However, in conventional sealed hydrodynamic bearing motors,
Although it is possible to block out dust and the like from the outside, there are the following problems.
すなわち、モータのケースに貫通孔を形成し、該貫通孔
に固定軸や位置決めビンなどの軸部材を圧入固定するこ
とが行われるが、その嵌合部から空気が洩れるため、外
気中の水蒸気がケース内に侵入して該ケース内の空気の
相対湿度が上昇し、動圧流体軸受部に露結したり、腐蝕
やカジリが生じて動圧流体軸受としての特性が劣化して
回転が不安定になることがあった。In other words, a through hole is formed in the motor case, and a shaft member such as a fixed shaft or a positioning bottle is press-fitted into the through hole, but since air leaks from the fitting part, water vapor in the outside air The air enters the case and increases the relative humidity of the air inside the case, resulting in dew condensation on the hydrodynamic bearing, corrosion or galling, and deterioration of the hydrodynamic bearing's characteristics, resulting in unstable rotation. Sometimes it became.
すなわち、圧入嵌合孔の微少隙間から外気の水蒸気が浸
入し、ケース内部の空気の相対湿度が一定（例えば６０
％）以上に達すると、モータ回転時に圧力（ゲージ圧で
例えば１気圧）が発生する際に、水蒸気が等温変化で水
になり、回転が不安定になって回転スリーブが固定軸に
接触し該回転スリーブの内面が削られて焼付きを起こす
場合があった。In other words, water vapor from the outside air enters through the small gap in the press-fitting hole, and the relative humidity of the air inside the case remains constant (for example, 60°C).
%), when pressure (for example, 1 atm in gauge pressure) is generated when the motor rotates, water vapor changes to water due to isothermal changes, and rotation becomes unstable and the rotating sleeve comes into contact with the fixed shaft. In some cases, the inner surface of the rotating sleeve was scraped, causing seizure.
本発明の目的は、このような従来技術の問題を解決でき
、安価な構成で、密封されたモータケース内への水蒸気
の浸入を防止し、該モータケース内の空気の水蒸気量を
一定以下に保つことにより、動圧流体軸受としての特性
の劣化やカジリ発生を防止しうる密封型動圧流体軸受モ
ータを提供することである。An object of the present invention is to solve the problems of the prior art, to prevent water vapor from entering a sealed motor case, and to reduce the amount of water vapor in the air within the motor case to a certain level or less, with an inexpensive configuration. It is an object of the present invention to provide a sealed type hydrodynamic bearing motor that can prevent deterioration of characteristics as a hydrodynamic bearing and occurrence of galling by maintaining the motor.
本発明は回転によって発生する流体の動圧で回転体を軸
支する動圧流体軸受と、該動圧流体軸受を収容する密閉
空間を形成するケースと、前記回転体を駆動する回転駆
動手段とを有する密封型動圧流体軸受モータにおいて実
施されるものであり、請求項１は、前記ケースに形成し
た連通孔に座ぐりを設け、該連通孔に軸部材を緊締嵌合
した後前記座ぐりにエポキシ樹脂等のシール材を充填す
ることにより、上記目的を達成するものである。The present invention includes a hydrodynamic bearing that supports a rotating body using the dynamic pressure of fluid generated by rotation, a case that forms a sealed space that accommodates the hydrodynamic bearing, and a rotational drive means that drives the rotating body. Claim 1 is implemented in a sealed type hydrodynamic bearing motor having: a communication hole formed in the case is provided with a counterbore, and after a shaft member is tightly fitted into the communication hole, the counterbore is removed. The above object is achieved by filling the inside with a sealing material such as epoxy resin.
請求項２は、前記ケースに形成した連通孔に緊締嵌合さ
れる軸部材の嵌合深さを該軸部材が外面から突出しない
ように設定し、この嵌合部の外面にポリエチレンフィル
ム等の吸湿性の小さい材質で作られかつ前記軸部材の径
を含む広さを有するシール部材を貼り付けることにより
、上記目的を達成するものである。According to a second aspect of the present invention, the fitting depth of the shaft member tightly fitted into the communication hole formed in the case is set so that the shaft member does not protrude from the outer surface, and the outer surface of this fitting portion is covered with a polyethylene film or the like. The above object is achieved by pasting a sealing member made of a material with low hygroscopicity and having a width that includes the diameter of the shaft member.
請求項３は、前記ケースに形成される軸部材圧入用の孔
を、該ケースを貫通しない盲孔にすることにより、上記
目的を達成するものである。According to a third aspect of the present invention, the above object is achieved by making the hole for press-fitting the shaft member formed in the case a blind hole that does not penetrate the case.
以下図面を参照して本発明を具体的に説明する。 The present invention will be specifically described below with reference to the drawings.
第１図は本発明による密封型動圧流体軸受モータの一実
施例を示す縦断面図であり、第２図は第１図中の線■−
■から見た底面図である。FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a sealed hydrodynamic bearing motor according to the present invention, and FIG.
It is a bottom view seen from ■.
第１図において、外筒１の底面にＯリング２を介してフ
ランジ部材３がボルト等で密封状態で固定され、該フラ
ンジ部材３の中央の孔にはモータ内部へ延びる固定軸４
が焼嵌め等で圧入固定されている。In FIG. 1, a flange member 3 is fixed to the bottom surface of an outer cylinder 1 in a sealed state with bolts or the like via an O-ring 2, and a fixed shaft 4 extending into the inside of the motor is provided in a central hole of the flange member 3.
are press-fitted and fixed by shrink fitting, etc.
前記固定軸４の周面にはへリングボール溝やスバライラ
ル溝から成る溝５が刻設され、そのまわりに２〜２０μ
ｍの隙間を介して回転スリーブ６が回転自在に嵌合され
ている。A groove 5 consisting of a Hering ball groove or a Subaral groove is carved on the circumferential surface of the fixed shaft 4, and a groove 5 of 2 to 20 μm is formed around the groove.
The rotating sleeve 6 is rotatably fitted through a gap of m.
前記回転スリーブ６内の前記固定軸４の上端面に近接す
る位置には、中心部に絞り孔７を有するスラスト受け８
が圧入されている。A thrust receiver 8 having a throttle hole 7 in the center is located in the rotary sleeve 6 at a position close to the upper end surface of the fixed shaft 4.
is press-fitted.
一方、前記回転スリーブ６の下端部には、ケース内の空
気を前記固定軸４の外周部（回転スリーブ６の内面）に
導入するための吸込口（切欠きまたは隙間を含む）３１
が設けられている。On the other hand, a suction port (including a notch or a gap) 31 is provided at the lower end of the rotating sleeve 6 for introducing air inside the case to the outer circumference of the fixed shaft 4 (inner surface of the rotating sleeve 6).
is provided.
そこで、前記回転スリーブ６の内面と、前記固足輪４の
外周部と、前記スラスト受け８と、前記吸込口３１とに
より、空気または窒素ガス等を媒体とした動圧流体軸受
が構成されている。Therefore, the inner surface of the rotary sleeve 6, the outer circumference of the rigid ring 4, the thrust receiver 8, and the suction port 31 constitute a hydrodynamic bearing using air, nitrogen gas, or the like as a medium. There is.
前記回転スリーブ６の上部フランジ部２８の上側には多
面鏡９が圧入またはビス止め等で固定され、該回転スリ
ーブ６の下部近傍の外周にはモータのロータとしてのマ
グネット１０が接着固定されており、該ロータマグ２７
ト１０の端面部には動バランスをとるためのバランスリ
ング１１が固定されている。A polygonal mirror 9 is fixed to the upper side of the upper flange portion 28 of the rotating sleeve 6 by press fitting or screwing, and a magnet 10 serving as a rotor of the motor is adhesively fixed to the outer periphery near the lower part of the rotating sleeve 6. , the rotor mag 27
A balance ring 11 for dynamic balance is fixed to the end face of the shaft 10.
また、マグネット１０に対向する位置には外筒１に固定
されたステータ１２が配置され、磁界の変化を検出する
ホール素子１３並びに磁界の変化がらＰＬＬ制御のため
の回転数を得るホールＩＣ（図示せず）などがプリント
基板１４及びホルダー１５を介してステータ１２に固定
され、これらによって回転体を駆動するための回転駆動
手段（ＤＣモータ）が構成されている。In addition, a stator 12 fixed to the outer cylinder 1 is disposed at a position facing the magnet 10, and a Hall element 13 for detecting changes in the magnetic field and a Hall IC (Fig. (not shown) are fixed to the stator 12 via a printed circuit board 14 and a holder 15, and these constitute a rotational drive means (DC motor) for driving the rotating body.
また、外筒１には、多面鏡９で走査されるレーザー光が
入射および出射するガラス窓２４が接着等で密封状態で
取付けられている。Further, a glass window 24 through which a laser beam scanned by a polygon mirror 9 enters and exits is attached to the outer cylinder 1 in a sealed state by adhesive or the like.
さらに、前記外筒１の上部には、組立てを容易化するた
めに分割されたケースの一部を形成するキャップ２７が
０リング１６を挟んで該外筒Ｉに対し密封状態で固定さ
れている。Further, on the upper part of the outer cylinder 1, a cap 27 forming part of a divided case is fixed to the outer cylinder I in a sealed state with an O-ring 16 in between to facilitate assembly. .
モータを作動させる際は、ステータ１２のコイルに電流
が流されると、回転スリーブ６はマグネッ）１０との磁
気的反撥吸引力により所定方向に回転を始める。When the motor is operated, when a current is applied to the coil of the stator 12, the rotating sleeve 6 starts rotating in a predetermined direction due to magnetic repulsion and attraction with the magnet 10.
その結果、固定軸４の溝５と回転スリーブ６の内面との
間の空気流動により、ケース内の空気が回転スリーブ６
の下端に形成された入口（空気吸入口）３１から固定軸
４の周囲へ流入し、さらに、該固定軸４に刻設された溝
５に沿って流れ込み、ラジアル方向に圧力が発生する。As a result, the air in the case is transferred to the rotating sleeve 6 due to the air flow between the groove 5 of the fixed shaft 4 and the inner surface of the rotating sleeve 6.
Air flows into the vicinity of the fixed shaft 4 through an inlet (air intake port) 31 formed at the lower end of the holder, and further flows along the groove 5 carved in the fixed shaft 4, generating pressure in the radial direction.
また、上部スラスト受け８の絞り孔７で空気の流れが絞
られることにより、スラスト方向にも圧力が発生する。Further, as the air flow is restricted by the restriction hole 7 of the upper thrust receiver 8, pressure is also generated in the thrust direction.
したがって、回転スリーブ６はラジアルおよびスラスト
方向ともに固定軸４に接触することなしに回転し続ける
。Therefore, the rotating sleeve 6 continues to rotate without contacting the fixed shaft 4 in both the radial and thrust directions.
この場合、ケース内には第１図中に矢印で示すような空
気の流れが生じることになる。この空気の流れの流量は
例えば、１分当り２〜２０ｃｄ程度である。In this case, air flows as shown by arrows in FIG. 1 will occur within the case. The flow rate of this air flow is, for example, about 2 to 20 cd per minute.
第１図および第２図において、モータのケースの一部を
構成する前記外筒１の中底４１を形成する周辺部の個所
（例えば３個所）に該モータ（偏光走査モータ）を光学
設計位置に位置決め固定するための位置決めピン４２が
圧入嵌合されている。In FIGS. 1 and 2, the motor (polarized light scanning motor) is placed at an optically designed position (for example, at three locations) on the periphery forming the inner bottom 41 of the outer cylinder 1, which constitutes a part of the motor case. A positioning pin 42 for positioning and fixing is press-fitted therein.
第３図は前記位置決めピン４２の圧入嵌合部を示す部分
縦断面図である。FIG. 3 is a partial vertical sectional view showing the press-fitting portion of the positioning pin 42. As shown in FIG.
第３図において、外筒ｌの中底部４１にはケース内外に
通じる連通孔４３が形成され、該連通孔４３のケース内
側端面には所定深さの座ぐり４４が形成されている。In FIG. 3, a communication hole 43 communicating with the inside and outside of the case is formed in the inner bottom portion 41 of the outer cylinder l, and a counterbore 44 of a predetermined depth is formed in the end surface of the communication hole 43 inside the case.
一方、前記位置決めピン４２は圧入作業が容易でピン高
さを精度よく出すために段付き形状になっている。On the other hand, the positioning pin 42 has a stepped shape to facilitate press-fitting and to accurately determine the height of the pin.
然して、前記位置決めピン４２を前記連通孔４３に図示
のように圧入嵌合した後、前記座ぐり４４にエポキシ樹
脂などのシール材４５が充填されている。After the positioning pin 42 is press-fitted into the communication hole 43 as shown, the counterbore 44 is filled with a sealing material 45 such as epoxy resin.
位置決めピン４２を圧入嵌合しただけでは嵌合部の微細
隙間を通して空気が洩れる可能性があるが、前述のシー
ル材４５を図示のようにピン４２の圧入嵌合部の全周を
完全に被覆するように充填することにより、嵌合部から
の空気漏れをなくして確実な密封性を得ることができた
。If the positioning pin 42 is simply press-fitted, air may leak through the minute gaps in the fitting part, but if the sealing material 45 described above is used to completely cover the entire circumference of the press-fitting part of the pin 42 as shown in the figure. By filling it in such a manner, air leakage from the fitting portion was eliminated and a reliable seal was obtained.
第１図に戻らて、ケースの一部を構成する前記フランジ
部材３は通常アルミまたは鋼などの金属材料で作られ、
動圧流体軸受を構成する前記固定軸４は該フランジ部材
４の中心部に圧入嵌合されている。Returning to FIG. 1, the flange member 3 constituting a part of the case is usually made of a metal material such as aluminum or steel;
The fixed shaft 4 constituting the hydrodynamic bearing is press-fitted into the center of the flange member 4.
第４ｒ！！Ｊはこの固定軸４の圧入嵌合部の部分拡大縦
断面図である。4th r! ! J is a partially enlarged vertical sectional view of the press-fitting portion of the fixed shaft 4.
第４図において、フランジ部材３の中心部にはケース内
外に通じる連通孔（貫通孔）４６が形成され、該連通孔
４６のケース外側端面には所定深さの座ぐり４７が形成
されている。In FIG. 4, a communication hole (through hole) 46 communicating with the inside and outside of the case is formed in the center of the flange member 3, and a counterbore 47 of a predetermined depth is formed in the outer end surface of the case of the communication hole 46. .
然して、前記固定軸４を前記連通孔４６に図示のように
緊締嵌合（圧入または焼成め嵌合も含む）した後、前記
座ぐり４７にエポキシ樹脂などのシール材４８が充填さ
れている。After the fixed shaft 4 is tightly fitted into the communication hole 46 as shown in the figure (including press fitting or firing fitting), the counterbore 47 is filled with a sealing material 48 such as epoxy resin.
この場合も、固定軸４を緊締嵌合しただけでは嵌合部の
微細隙間を通して空気が洩れる可能性があるが、前述の
シール材４８を図示のように固定軸４の嵌合部の全周を
完全に被覆するように充填することにより、該嵌合部か
らの空気漏れをなくし、確実な密封性を得ることができ
た。In this case as well, if the fixed shaft 4 is only tightly fitted, there is a possibility that air may leak through the minute gaps in the fitted part, but if the sealing material 48 described above is applied to the entire circumference of the fitted part of the fixed shaft 4 as shown in the figure. By filling it so as to completely cover it, it was possible to eliminate air leakage from the fitting part and obtain reliable sealing performance.
前述の位置決めピン４２および固定軸４は嵌合される連
通孔４３．４６に対しては“軸部材”と総称されるもの
であり、本発明は、ケースを構成する部材にケース内外
を連通ずるＭ通孔４３．４６を形成するとともに該貫通
孔４３．４６の端面に４４．４７を設け、該連通孔４４
．４７に軸部材４２．４を緊締嵌合した後前記座ぐり４
４．４７にエポキシ樹脂等のシール材を充填することを
特徴とするものである。The above-mentioned positioning pin 42 and fixed shaft 4 are collectively referred to as a "shaft member" with respect to the communication holes 43 and 46 into which they are fitted, and the present invention provides a system for connecting the inside and outside of the case to the members constituting the case. M through-holes 43.46 are formed, and 44.47 are provided on the end face of the through-holes 43.46.
．． After tightening and fitting the shaft member 42.4 to 47, the counterbore 4
4.47 is filled with a sealing material such as epoxy resin.
以上の実施例によれば、連通孔４３．４６に軸部材４２
．４を緊締嵌合した後、該連通孔４３．４６に設けた座
ぐり４４．４７にシール材４５．４８を充填したので、
嵌合部の密封性能が格段に向上し、水中でケース内に２
気圧（ゲージ圧）をかけても空気漏れ（泡）を生じるこ
とがなく、ケース内外を完全に密封することができた。According to the above embodiment, the shaft member 42 is located in the communication hole 43.46.
．． After tightening and fitting 4, the counterbore 44.47 provided in the communication hole 43.46 was filled with sealing material 45.48.
The sealing performance of the mating part has been significantly improved, allowing two parts to fit inside the case underwater.
Even when atmospheric pressure (gauge pressure) was applied, there were no air leaks (bubbles), and the case was completely sealed inside and out.
その結果、ケースに設けた軸部材嵌合部からの水蒸気の
浸入を防止して該ケース内の空気の相対湿度を一定以下
に抑えることができ、もって、動圧流体軸受の露結等に
よる回転性能の劣化やカジリの発生を防止しうる密封型
動圧流体軸受モータが得られた。As a result, it is possible to prevent water vapor from entering from the shaft member fitting part provided in the case and to suppress the relative humidity of the air inside the case to a certain level or less, thereby preventing rotation of the hydrodynamic bearing due to dew condensation, etc. A sealed hydrodynamic bearing motor that can prevent performance deterioration and galling has been obtained.
第５図は本発明による密封型動圧流体軸受モータの他の
実施例の要部を示す部分拡大縦断面図である。FIG. 5 is a partially enlarged vertical cross-sectional view showing the main parts of another embodiment of the sealed hydrodynamic bearing motor according to the present invention.
本実施例においては、モータケースの一部を構成する前
記フランジ部材１３の中心部にストレートな連通孔５１
を形成するとともに該連通孔５１に前記固定軸（軸部材
）４が焼成め等で緊締嵌合されており、組立て時の該固
定軸４の嵌合深さはその先端がケース（フランジ部材３
）の外面から突出しないように設定され、該固定軸（軸
部材）４の嵌合部のケースの外面にポリエチレンフィル
ム等のシール部材５２が接着または粘着で貼り付けられ
ている。In this embodiment, a straight communication hole 51 is provided in the center of the flange member 13 that constitutes a part of the motor case.
, and the fixed shaft (shaft member) 4 is tightly fitted into the communicating hole 51 by firing or the like, and the fitting depth of the fixed shaft 4 during assembly is such that the tip of the fixed shaft (shaft member 3
), and a sealing member 52 such as a polyethylene film is attached with adhesive or adhesive to the outer surface of the case at the fitting portion of the fixed shaft (shaft member) 4.
前記シール部材５２は、前記固定軸（軸部材）４の嵌合
径の全域を完全に被覆する広さを有している。The seal member 52 has a width that completely covers the entire fitting diameter of the fixed shaft (shaft member) 4.
また、前記シール部材５２は、ポリエチレンフィルム等
の吸湿性の小さな材質で作られている。Furthermore, the sealing member 52 is made of a material with low hygroscopicity, such as polyethylene film.
第５図の実施例は、以上説明した軸部材（固定軸）４の
嵌合固定部の構造が第１図〜第４図の実施例と相違し、
その他の部分は第１図〜第４図の場合と実質上同じであ
り、それぞれ対応する部分を同じ番号で表示しそられの
詳細な説明は省略する。The embodiment shown in FIG. 5 is different from the embodiment shown in FIGS. 1 to 4 in the structure of the fitting and fixing part of the shaft member (fixed shaft) 4 explained above.
Other parts are substantially the same as those in FIGS. 1 to 4, and corresponding parts are indicated by the same numbers and detailed explanations thereof will be omitted.
第５図の場合も、軸部材４を緊締嵌合しただけでは嵌合
部の微細隙間を通して空気が洩れる可能性があるが、前
述のシール部材５２を図示のように軸部材４の嵌合部の
全周を完全に被覆するようにケース外面に貼り付けるこ
とにより、該嵌合部からの空気漏れをなくし、確実な密
封性を得ることができた。In the case of FIG. 5 as well, if the shaft member 4 is only tightly fitted, there is a possibility that air may leak through the minute gap in the fitting part, but if the seal member 52 is attached to the fitting part of the shaft member 4 as shown in the figure, By attaching it to the outer surface of the case so as to completely cover the entire circumference of the case, it was possible to eliminate air leakage from the fitting part and obtain reliable sealing performance.
したがって、第５図の実施例によっても、第１図〜第４
図の実施例の場合と同じ効果が得られ、外気からケース
内部への水蒸気の浸入を防止することにより該ケース内
の空気の相対湿度を一定以下に抑えることができ、もっ
て、動圧流体軸受の露結等による回転性能の劣化やカジ
リの発生を無くしうる密封型動圧流体軸受モータが得ら
れた。Therefore, even in the embodiment shown in FIG.
The same effect as in the embodiment shown in the figure can be obtained, and by preventing water vapor from entering the case from the outside air, the relative humidity of the air inside the case can be suppressed to a certain level or less. A sealed hydrodynamic bearing motor that can eliminate deterioration of rotational performance and occurrence of galling due to dew condensation, etc., has been obtained.
第６図は本発明による密封型動圧流体軸受モータのさら
に別の実施例の要部を示す部分拡大縦断面図である。FIG. 6 is a partially enlarged vertical cross-sectional view showing the main parts of still another embodiment of the sealed hydrodynamic bearing motor according to the present invention.
本実施例においては、モータケースの一部を形成する外
筒１の中庭部４１にはケース内外に通じる連通孔４３が
形成され、該連通孔４３に軸部材（位置決めピン）６２
が正大固定されている。In this embodiment, a communication hole 43 that communicates with the inside and outside of the case is formed in the courtyard 41 of the outer cylinder 1 that forms a part of the motor case, and a shaft member (locating pin) 62 is formed in the communication hole 43.
is fixed to positive size.
この位置決めピン６２は、第１図中の位置決めピン４２
と同様、周辺部の個所（例えば３個所）に固定され密封
型動圧流体軸受モータ（偏光走査モータ）を光学設計位
置に位置決め固定するためのものである。This positioning pin 62 is similar to the positioning pin 42 in FIG.
Similarly, it is fixed at peripheral locations (for example, three locations) for positioning and fixing a sealed hydrodynamic bearing motor (polarization scanning motor) at an optically designed position.
前記軸部材（位置決めピン）６２は、圧入じやすく突出
高さを高精度で出しうるように段付き形状になっている
。The shaft member (positioning pin) 62 has a stepped shape so that it can be easily press-fitted and the protrusion height can be determined with high accuracy.
然して、前記軸部材６２の緊締嵌合部６３の周面には接
着材溜り用の円周方向溝６４が形成され、該軸部材６２
の緊締嵌合部６３の表面および前記溝６４内に嫌気性接
着材（瞬間接着材）６５を塗布および充填した後、該軸
部材６２を圧入固定するという工程が採られる。A circumferential groove 64 for an adhesive reservoir is formed on the circumferential surface of the tightening fitting portion 63 of the shaft member 62.
After applying and filling an anaerobic adhesive (instant adhesive) 65 on the surface of the tightening fitting portion 63 and in the groove 64, the shaft member 62 is press-fitted and fixed.
充分な量の接着材６５を溝６４内に予め充填しておけば
、軸部材６２を連通孔４３に嵌合させて組付けた状態で
、接着材６５が前記円周溝６４内に保持されることにな
り、密封性にすぐれたシール手段が得られる。If a sufficient amount of the adhesive 65 is filled in the groove 64 in advance, the adhesive 65 will be retained in the circumferential groove 64 when the shaft member 62 is fitted into the communication hole 43 and assembled. Therefore, a sealing means with excellent sealing performance can be obtained.
この場合も、軸部材（位置決めピン）６２を圧入嵌合す
るだけでは嵌合部の微細隙間を通して空気が洩れること
があるが、前述のように軸部材６２の嵌合部６３に円周
方向の溝６４を形成するとともに、該溝６４内に接着材
を充填して嵌合部の全周を完全に密封するシール構造を
形成することにより、嵌合部からの空気漏れをなくすこ
とができた。In this case as well, if the shaft member (positioning pin) 62 is simply press-fitted, air may leak through the minute gaps in the fitting portion, but as described above, the fitting portion 63 of the shaft member 62 may By forming the groove 64 and filling the groove 64 with adhesive to form a seal structure that completely seals the entire circumference of the fitting part, air leakage from the fitting part can be eliminated. .
したがって、第６図の実施例によっても、第１図〜第４
図あるいは第５図の実施例の場合と同様の効果が得られ
、外気からケース内部への水蒸気の浸入を防止すること
により、該ケース内の空気の相対湿度を一定以下に抑え
ることができ、もって、露結等による回転性能の劣化や
カジリの発生を無くしうる密封型動圧流体軸受モータが
得られた。Therefore, even in the embodiment shown in FIG.
The same effect as in the embodiment shown in FIG. 5 or FIG. 5 can be obtained, and by preventing water vapor from entering the case from the outside air, the relative humidity of the air inside the case can be kept below a certain level. As a result, a sealed hydrodynamic bearing motor that can eliminate deterioration of rotational performance and occurrence of galling due to dew condensation etc. has been obtained.
第７図は本発明による密封型動圧流体軸受モータのさら
に別の実施例の要部の部分拡大縦断面図である。FIG. 7 is a partially enlarged vertical cross-sectional view of a main part of still another embodiment of the sealed hydrodynamic bearing motor according to the present invention.
本実施例においては、モータのケースの一部を形成する
外筒１の中庭部４１に形成される軸部材（位置決めピン
）７２固定用の孔７３が該ケースを貫通しない盲孔で形
成されている。In this embodiment, the hole 73 for fixing the shaft member (positioning pin) 72 formed in the courtyard 41 of the outer cylinder 1 forming a part of the motor case is formed as a blind hole that does not penetrate the case. There is.
この場合の軸部材（位置決めピン）７２も、圧入しやす
くかつ突出高さを高精度で決定できるように段付き形状
になっている。The shaft member (positioning pin) 72 in this case also has a stepped shape so that it can be easily press-fitted and the protrusion height can be determined with high precision.
第８図は本発明による密封型動圧流体軸受モータのさら
にまた別の実施例の要部の部分拡大縦断面図である。FIG. 8 is a partially enlarged vertical cross-sectional view of a main part of yet another embodiment of the sealed hydrodynamic bearing motor according to the present invention.
本実施例においては、モータケースの一部を形成するフ
ランジ部材３の中心部に形成される軸部材（固定軸）８
２固定用の孔８３が該フランジ部材３を貫通しない盲孔
で形成されている。In this embodiment, a shaft member (fixed shaft) 8 is formed at the center of a flange member 3 that forms part of a motor case.
2 fixing hole 83 is formed as a blind hole that does not penetrate through the flange member 3.
前記軸部材（固定軸）８２は、嵌合時の高さを高精度で
決定できるように中間部にストッパ用のフランジ８４が
形成されている。The shaft member (fixed shaft) 82 has a stopper flange 84 formed in its middle portion so that the height at the time of fitting can be determined with high precision.
第７図中の軸部材（位置決めピン）７２および第８図中
の軸部材（固定軸）８２とも、嵌合される盲孔７３．８
３に対して、圧入または焼成め法などで緊締嵌合するこ
とにより固定されている。The blind hole 73.8 is fitted with both the shaft member (positioning pin) 72 in FIG. 7 and the shaft member (fixed shaft) 82 in FIG.
3, it is fixed by being tightly fitted by press-fitting or firing method.
これら第７図および第８図の各実施例によれば、ケース
に貫通孔を形成することなく各軸部材７２．８２を固定
できるので、外気からケース内部への水蒸気の浸入は確
実に阻止することができ、該ケース内の空気の相対湿度
上昇をなくして露結等の発生を無（すことができ、動圧
流体軸受の回転性能を維持するとともに、カジリや腐蝕
を生じることなく耐久性および信頼性にすぐれた密封型
動圧流体軸受モータが得られた。According to each of the embodiments shown in FIGS. 7 and 8, each shaft member 72, 82 can be fixed without forming a through hole in the case, thereby reliably preventing water vapor from entering from the outside air into the inside of the case. It is possible to eliminate the relative humidity increase in the air inside the case and eliminate the occurrence of dew condensation, maintain the rotational performance of the hydrodynamic bearing, and increase durability without galling or corrosion. A sealed hydrodynamic bearing motor with excellent reliability was obtained.
以上の説明から明らかなごとく、回転によって発生する
流体の動圧で回転体を軸支する動圧流体軸受と、該動圧
流体軸受を収容する密閉空間を形成するケースと、前記
回転体を駆動する回転駆動手段とを有する密封型動圧流
体軸受モータにおいて、１ｎ求項１の発明は、前記ケー
スに形成した連通孔に座ぐりを設け、該連通孔に軸部材
を緊締嵌合した後前記座ぐりにエポキシ樹脂等のシール
材を充填する構成とし、請求項２の発明は、前記ケース
に形成した連通孔に緊締嵌合される軸部材の嵌合深さを
該軸部材が外面から突出しないように設定し、この嵌合
部の外面にポリエチレンフィルム等の吸湿性の小さい材
質で作られかつ前記軸部材の径を含む広さを有するシー
ル部材を貼り付ける構成とし、請求項３の発明は、前記
ケースに形成される軸部材嵌合用の孔を該ケースを貫通
しない盲孔で形成する構成とすることにより、水蒸気が
軸部材嵌合部を通してケース内部へ浸入することを防止
して該ケース内の空気の水蒸気量を一定以下に抑えるこ
とができ、もって、ケース内部での露結等による動圧流
体軸受の回転性能の劣化やカジリまたは腐蝕の発生を防
止しうる密封型動圧流体軸受モータが得られる。As is clear from the above description, there is a hydrodynamic bearing that supports a rotating body using the dynamic pressure of fluid generated by rotation, a case that forms a sealed space that accommodates the hydrodynamic bearing, and a case that drives the rotating body. In the sealed hydrodynamic bearing motor having a rotational drive means, the invention of claim 1 provides a counterbore in the communication hole formed in the case, and after tightly fitting the shaft member into the communication hole, the The counterbore is filled with a sealing material such as epoxy resin, and the invention according to claim 2 is such that the fitting depth of the shaft member that is tightly fitted into the communication hole formed in the case is such that the shaft member protrudes from the outer surface. A sealing member made of a material with low hygroscopicity such as polyethylene film and having a width including the diameter of the shaft member is attached to the outer surface of the fitting portion, and the invention according to claim 3 By forming the hole for fitting the shaft member formed in the case as a blind hole that does not penetrate the case, water vapor can be prevented from penetrating into the case through the shaft member fitting part. Sealed hydrodynamic fluid that can suppress the amount of water vapor in the air inside the case below a certain level, thereby preventing deterioration of the rotational performance of the hydrodynamic bearing due to dew condensation inside the case, and preventing galling or corrosion. A bearing motor is obtained.
第１図は本発明による密封型動圧流体軸受モータの一実
施例の縦断面図、第２図は第１図中の線ｎ−ｎから見た
底面図、第３図は第１図中の位置決めピンの嵌合部の部
分拡大縦断面図、第４図は第１図中の固定軸の嵌合部の
部分拡大縦断面図、第５図〜第８図は、それぞれ、本発
明による密封型動圧流体軸受モータのその他の各種の実
施例の要部を示す部分拡大縦断面図である。
１ ・・−・・・−・・・？［（ケース）、３−・・・
−・−・・・フランジ部材（ケース）、４ ・・−・・
・・・・・・軸部材（固定軸）、５ ・・−・・−・・
−・溝、６ 回転スリーブ、８−・−・・スラス
ト受け、９ ・−−−−−・−・−・−回転体（多面鏡
）、１０．１２ 回転駆動手段、２７−・−・
−−−−−−・キャンプ（ケース）、４２− 軸部
材（位置決めピン）、４３−・−・・・連通孔、４４
・・−ｍ−−−・・−・・座ぐり、４５−・・−・−・
・・−・・シール材、４６−・−・−・−・・連通孔、
４７・・−・−・−・−・座ぐり、４８ ・・・・・−
・・−シール材、５１ ・−・−・・−・−・一連通孔
、５２ ・・・−・−−−一一−シール部材、６２−・
・−・−・・軸部材（位置決めビン）、６４・−・−・
−・−・・・溝、６５−・−・−−一−−−−−・接着
剤、７２−・−・−・軸部材（位置決めビン） 、７３
−−−−−−・−・−盲孔、８２−・・・・・−・・
−・軸部材（固定軸’） 、８３−−−−−・−−−一
−−盲孔。
代理人 弁理士 大 音 康 毅
手を眉甫正書
（自発）
平成２年３月２０日
２、発明の名称
密封型動圧流体軸受モータ
３、補正をする者
事件との関係 特許出願人
住 所 東京都大田区下丸子３丁目３０番２号氏 名
（１００）キャノン株式会社代表者 山路敬三
４、代理人
住所
〒１０１
東京都千代田区神田鍛冶町３丁目３番９号共同ビル（新
千代田）７３号
自
発
第７
図
第８
図
７、補正の内容
（１）特許請求の範囲を別紙のとおりに改める。
（２）明細書第６頁第９行の「ボー」と「溝」との間の
「ル」をｒン」に改める。
（３）同第１５頁第７行の「接着」と「溜り」との間の
「材」を「剤ｊにあらためる。
遺ス コニ
別 紙
特許請求の範囲
（１）回転によって発生する流体の動圧で回転体を軸支
する動圧流体軸受と、該動圧流体軸受を収容する密閉空
間を形成するケースと、前記回転体を駆動する回転駆動
手段とを存する密封型動圧流体軸受モータにおいて、前
記ケースに形成した連通孔に座ぐりを設け、該連通孔に
軸部材を緊締嵌合した後前記座ぐりにエポキシ樹脂等の
シール材を充填することを特徴とする密封型動圧流体軸
受モータ。
（２）回転によって発生する流体の動圧で回転体を軸支
する動圧流体軸受と、該動圧流体軸受を収容する密閉空
間を形成するケースと、前記回転体を駆動する回転駆動
手段とを有する密封型動圧流体軸受モータにおいて、前
記ケースに形成した連通孔に緊締嵌合される軸部材の嵌
合深さを玖軸部材が外面から突出しないように設定し、
この嵌合部の外面にポリエチレンフィルム等の吸湿性の
小さい材質で作られかつ前記軸部材の径を含む広さを有
するシール部材を貼り付けることを特徴とする密封型動
圧流体軸受モータ。
（３）回転体によって発生する流体の動圧で回転体を軸
支する動圧流体軸受と、該動圧流体軸受を収容する密閉
空間を形成するケースと、前記回転体を駆動する回転駆
動手段とを存する密封型動圧流体軸受モータにおいて、
前記ケースに形成される軸部材嵌合用の孔が該ケースを
貫通しない盲孔であることを特徴とする密封型動圧流体
軸受モータ。FIG. 1 is a longitudinal sectional view of an embodiment of a sealed hydrodynamic bearing motor according to the present invention, FIG. 2 is a bottom view taken along line nn in FIG. 1, and FIG. 3 is a bottom view in FIG. 1. FIG. 4 is a partially enlarged vertical cross-sectional view of the fitting portion of the fixed shaft in FIG. 1, and FIGS. FIG. 7 is a partially enlarged vertical sectional view showing essential parts of various other embodiments of the sealed hydrodynamic bearing motor. 1 ・・・－・・・－・・・? [(case), 3-...
−・−・Flange member (case), 4 ・−・・
・・・・・・Shaft member (fixed shaft), 5 ・・・−・・−・・
- Groove, 6 Rotating sleeve, 8 - Thrust receiver, 9 - Rotating body (polygon mirror), 10.12 Rotation drive means, 27 -...
--------・Camp (case), 42- Shaft member (positioning pin), 43-...Communication hole, 44
・・−m−−−・・−・・Counterbore, 45−・・−・−・
・・・・・Sealing material, 46−・−・−・−・・Communication hole,
47・・−・−・−・−・Spot face, 48 ・・・・・・−
・・−Sealing material, 51 ・−・−・・−・−・Series of through holes, 52 ・・・−・−−−11−Sealing member, 62−・
・−・−・Shaft member (positioning pin), 64・−・−・
−・−・Groove, 65−・−・−−−−・Adhesive, 72−・−・−・Shaft member (positioning bottle), 73
−−−−−−・−・−Blind hole, 82−・・・・−・・
---Shaft member (fixed shaft'), 83---------1--Blind hole. Agent: Patent attorney: Yasushi Ooto, Takete, Seisho of Mayo (self-motivated) March 20, 1990 2. Name of the invention: sealed type hydrodynamic bearing motor 3. Relationship with the case of the person making the amendment: Patent applicant's residence: Address: 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (100) Canon Co., Ltd. Representative: Keizo Yamaji 4, Agent Address: Kyodo Building (Shin-Chiyoda), 3-3-9 Kanda Kajicho, Chiyoda-ku, Tokyo 101 No. 73 Sponsorship No. 7 Figure 8 Figure 7, Contents of amendment (1) The scope of claims is amended as shown in the attached sheet. (2) In the 9th line of page 6 of the specification, the word ``run'' between ``bo'' and ``groove'' is changed to ``run''. (3) The ``material'' between ``adhesion'' and ``reservoir'' in line 7 of page 15 of the same document is changed to ``agent j.'' A sealed hydrodynamic bearing motor that includes a hydrodynamic bearing that supports a rotating body using dynamic pressure, a case that forms a sealed space that accommodates the hydrodynamic bearing, and a rotational drive means that drives the rotating body. In the sealed dynamic pressure fluid, a counterbore is provided in the communication hole formed in the case, and after the shaft member is tightly fitted into the communication hole, the counterbore is filled with a sealing material such as epoxy resin. Bearing motor. (2) A hydrodynamic bearing that supports a rotating body using the dynamic pressure of fluid generated by rotation, a case that forms a sealed space that accommodates the hydrodynamic bearing, and a rotation that drives the rotating body. In a sealed hydrodynamic bearing motor having a drive means, the fitting depth of the shaft member tightly fitted into the communication hole formed in the case is set so that the shaft member does not protrude from the outer surface,
A sealed hydrodynamic bearing motor characterized in that a sealing member made of a material with low hygroscopicity such as polyethylene film and having a width including the diameter of the shaft member is attached to the outer surface of the fitting portion. (3) A hydrodynamic bearing that supports the rotating body using the dynamic pressure of fluid generated by the rotating body, a case that forms a sealed space that accommodates the dynamic pressure fluid bearing, and a rotational drive means that drives the rotating body. In a sealed hydrodynamic bearing motor,
A sealed hydrodynamic bearing motor, characterized in that a hole for fitting a shaft member formed in the case is a blind hole that does not penetrate the case.
Claims (3)
する動圧流体軸受と、該動圧流体軸受を収容する密閉空
間を形成するケースと、前記回転体を駆動する回転駆動
手段とを有する密封型動圧流体軸受モータにおいて、前
記ケースに形成した連通孔に座ぐりを設け、該連通孔に
軸部材を緊締嵌合した後前記座ぐりにエポキシ樹脂等の
シール材を充填することを特徴とする密封型動圧流体軸
受モータ。(1) A hydrodynamic bearing that pivotally supports a rotating body using the dynamic pressure of fluid generated by rotation, a case that forms a sealed space that accommodates the hydrodynamic bearing, and a rotational drive means that drives the rotating body. In the sealed hydrodynamic bearing motor, a counterbore is provided in the communication hole formed in the case, and after a shaft member is tightly fitted into the communication hole, the counterbore is filled with a sealing material such as epoxy resin. A sealed hydrodynamic bearing motor featuring:
する動圧流体軸受と、該動圧流体軸受を収容する密閉空
間を形成するケースと、前記回転体を駆動する回転駆動
手段とを有する密封型動圧流体軸受モータにおいて、前
記ケースに形成した連通孔に緊締嵌合される軸部材の嵌
合深さを外軸部材が外面から突出しないように設定し、
この嵌合部の外面にポリエチレンフィルム等の吸湿性の
小さい材質で作られかつ前記軸部材の径を含む広さを有
するシール部材を貼り付けることを特徴とする密封型動
圧流体軸受モータ。(2) a hydrodynamic bearing that pivotally supports a rotating body using the dynamic pressure of fluid generated by rotation; a case that forms a sealed space that accommodates the hydrodynamic bearing; and a rotational drive means that drives the rotating body; In the sealed hydrodynamic bearing motor, the fitting depth of the shaft member that is tightly fitted into the communication hole formed in the case is set so that the outer shaft member does not protrude from the outer surface,
A sealed hydrodynamic bearing motor characterized in that a sealing member made of a material with low hygroscopicity such as polyethylene film and having a width including the diameter of the shaft member is attached to the outer surface of the fitting portion.
支する動圧流体軸受と、該動圧流体軸受を収容する密閉
空間を形成するケースと、前記回転体を駆動する回転駆
動手段とを有する密封型動圧流体軸受モータにおいて、
前記ケースに形成される軸部材嵌合用の孔が該ケースを
貫通しない盲孔であることを特徴とする密封型動圧流体
軸受モータ。(3) A hydrodynamic bearing that supports the rotating body using the dynamic pressure of the fluid generated by the rotating body, a case that forms a sealed space that accommodates the dynamic pressure fluid bearing, and a rotational drive means that drives the rotating body. In a sealed hydrodynamic bearing motor having
A sealed hydrodynamic bearing motor, characterized in that a hole for fitting a shaft member formed in the case is a blind hole that does not penetrate the case.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33341488A JPH02184236A (en) | 1988-12-29 | 1988-12-29 | Hermetic dynamic pressure fluid bearing motor |
| US07/458,549 US5097164A (en) | 1988-12-29 | 1989-12-28 | Hermetically sealed type dynamic pressure fluid bearing motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33341488A JPH02184236A (en) | 1988-12-29 | 1988-12-29 | Hermetic dynamic pressure fluid bearing motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02184236A true JPH02184236A (en) | 1990-07-18 |
Family
ID=18265845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33341488A Pending JPH02184236A (en) | 1988-12-29 | 1988-12-29 | Hermetic dynamic pressure fluid bearing motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02184236A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6756714B2 (en) * | 2002-07-10 | 2004-06-29 | Sunonwealth Electric Machine Industry Co., Ltd. | Dustproof bearing device for a motor |
| JP2012163100A (en) * | 2011-02-08 | 2012-08-30 | Dyson Technology Ltd | Rotor for turbomachine |
| US9926940B2 (en) | 2009-02-24 | 2018-03-27 | Dyson Technology Limited | Rotor assembly |
-
1988
- 1988-12-29 JP JP33341488A patent/JPH02184236A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6756714B2 (en) * | 2002-07-10 | 2004-06-29 | Sunonwealth Electric Machine Industry Co., Ltd. | Dustproof bearing device for a motor |
| US9926940B2 (en) | 2009-02-24 | 2018-03-27 | Dyson Technology Limited | Rotor assembly |
| JP2012163100A (en) * | 2011-02-08 | 2012-08-30 | Dyson Technology Ltd | Rotor for turbomachine |
| US9624941B2 (en) | 2011-02-08 | 2017-04-18 | Dyson Technology Limited | Rotor for a turbomachine |
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