JPH0666316A - Dynamic pressure bearing device - Google Patents
Dynamic pressure bearing deviceInfo
- Publication number
- JPH0666316A JPH0666316A JP24560292A JP24560292A JPH0666316A JP H0666316 A JPH0666316 A JP H0666316A JP 24560292 A JP24560292 A JP 24560292A JP 24560292 A JP24560292 A JP 24560292A JP H0666316 A JPH0666316 A JP H0666316A
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- fine powder
- dynamic pressure
- bearing device
- shaft
- 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
Landscapes
- Mechanical Optical Scanning Systems (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、例えばレーザービーム
プリンタ等に使用される偏向走査装置の回転装置におけ
る動圧軸受装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic pressure bearing device in a rotating device of a deflection scanning device used in, for example, a laser beam printer.
【0002】[0002]
【従来の技術】従来、レーザービームプリンタ等に使用
される高速かつ高精度に回転する回転装置には、非接触
で回転する動圧流体軸受が用いられている。図4はこの
ような回転装置の断面図であり、回転軸1とスリーブ2
は回転可能に嵌合し、スリーブ2の下端にはスラスト板
3を設置した固定板4が外筒5に固定されている。スラ
スト板3には回転軸1の下端と対向する表面に浅溝6が
刻設され、動圧スラスト軸受が形成されている。また、
スリーブ2内の回転軸1の外周面には2つのヘリングボ
ーン状の浅溝7が刻設され、動圧ラジアル軸受が形成さ
れている。更に、スリーブ2の開口部近傍の回転軸1の
外周面にはスパイラル状の浅溝8が刻設され、動圧流体
軸受に潤滑流体が流れるようになっている。また、スパ
イラル状の浅溝8と上段のヘリングボーン状の浅溝7と
の間のスリーブ2の内周面には凹部9及び小径孔10が
設けられ、潤滑流体として油、グリース等の液体が用い
られた場合に、動圧流体軸受の安定性が確保されるよう
になっている。2. Description of the Related Art Conventionally, a hydrodynamic bearing which rotates in a non-contact manner has been used in a rotating device used in a laser beam printer or the like which rotates at high speed and with high precision. FIG. 4 is a cross-sectional view of such a rotating device, which shows a rotating shaft 1 and a sleeve 2.
Is rotatably fitted, and a fixed plate 4 provided with a thrust plate 3 is fixed to the outer cylinder 5 at the lower end of the sleeve 2. A shallow groove 6 is formed on the surface of the thrust plate 3 facing the lower end of the rotary shaft 1 to form a dynamic thrust bearing. Also,
Two herringbone-shaped shallow grooves 7 are engraved on the outer peripheral surface of the rotary shaft 1 in the sleeve 2 to form a dynamic pressure radial bearing. Further, a spiral shallow groove 8 is engraved on the outer peripheral surface of the rotary shaft 1 near the opening of the sleeve 2 so that the lubricating fluid can flow to the hydrodynamic bearing. A recess 9 and a small diameter hole 10 are provided on the inner peripheral surface of the sleeve 2 between the spiral shallow groove 8 and the upper herringbone shallow groove 7, and a liquid such as oil or grease is used as a lubricating fluid. When used, the stability of the hydrodynamic bearing is ensured.
【0003】一方、回転軸1の上部にはフランジ11が
固定され、その下部には駆動マグネット12を固着した
ロータヨーク13が固定されている。また、外筒5の駆
動マグネット12と対向する面にはステータコイル14
が配置され、駆動モータが構成されている。更に、フラ
ンジ11の上面には回転多面鏡15が搭載されて、全体
として回転装置が構成されている。On the other hand, a flange 11 is fixed to the upper part of the rotary shaft 1, and a rotor yoke 13 to which a drive magnet 12 is fixed is fixed to the lower part thereof. Further, the stator coil 14 is provided on the surface of the outer cylinder 5 facing the drive magnet 12.
Are arranged, and a drive motor is configured. Further, a rotary polygon mirror 15 is mounted on the upper surface of the flange 11, and a rotating device is configured as a whole.
【0004】[0004]
【発明が解決しようとする課題】しかしながら上述の従
来例では、動圧軸受の周囲温度が上昇した場合に動圧流
体軸受部の温度が更に高温になり、外部振動が生じた場
合に油、グリース等の潤滑性が悪くなり、スリーブ2と
軸1との間でかじり現象が発生してモータの回転が停止
する欠点がある。However, in the above-mentioned conventional example, when the ambient temperature of the dynamic pressure bearing rises, the temperature of the dynamic pressure fluid bearing portion becomes further higher, and when external vibration occurs, oil or grease is generated. However, there is a drawback in that the lubrication of the motor is deteriorated and a galling phenomenon occurs between the sleeve 2 and the shaft 1 to stop the rotation of the motor.
【0005】特に、最近では15000rpm以上の高
速回転の要求が高まってステータコイル14に流れる電
流が大きくなり、軸受部も発熱するため動圧軸受装置は
70℃〜80℃程度にもなる。そのため、グリースの粘
度の低下に伴って軸受の保持力が低下し、回転軸1とス
リーブ2の間でかじり現象が発生し易い。Particularly, recently, the demand for high-speed rotation of 15,000 rpm or more has increased, the current flowing through the stator coil 14 increases, and the bearing portion also generates heat. Therefore, the holding force of the bearing decreases as the viscosity of the grease decreases, and the galling phenomenon easily occurs between the rotating shaft 1 and the sleeve 2.
【0006】本発明の目的は、かじり現象を発生せず、
良好な潤滑性を保持する動圧軸受装置を提供することに
ある。The object of the present invention is to prevent galling,
An object of the present invention is to provide a dynamic pressure bearing device that maintains good lubricity.
【0007】[0007]
【課題を解決するための手段】上述の目的を達成するた
めの本発明に係る動圧軸受装置は、相互に回転可能に嵌
合する軸とスリーブとを有し、前記軸の外周面と前記ス
リーブの内周面との間に浅溝を形成し、嵌合隙間に潤滑
油を注入し、動圧発生部を有する動圧軸受装置におい
て、前記嵌合隙間に注入された潤滑油の中に微粒粉末を
混入するか、又は前記軸或いは前記スリーブの少なくと
も一方に前記微粒粉末をコーティングしたものである。To achieve the above object, a hydrodynamic bearing device according to the present invention has a shaft and a sleeve that are rotatably fitted to each other, and the outer peripheral surface of the shaft and the sleeve. A shallow groove is formed between the inner peripheral surface of the sleeve and the lubricating oil is injected into the fitting gap, and in a dynamic pressure bearing device having a dynamic pressure generating portion, the lubricating oil is injected into the fitting gap. Fine powder is mixed, or at least one of the shaft and the sleeve is coated with the fine powder.
【0008】[0008]
【作用】上述の構成を有する動圧軸受装置は、軸とスリ
ーブの嵌合隙間に注入する潤滑油に微粒粉末を混入させ
るか、軸又はスリーブの少なくとも何れか一方に微粒粉
末をコーティングすることによって、軸とスリーブとの
かじり現象を防止する。In the dynamic pressure bearing device having the above-mentioned structure, the fine oil powder is mixed in the lubricating oil injected into the fitting gap between the shaft and the sleeve, or at least one of the shaft and the sleeve is coated with the fine powder. , Prevents galling between the shaft and sleeve.
【0009】[0009]
【実施例】本発明を図1〜図3に図示の実施例に基づい
て詳細に説明する。図1は第1の実施例の断面図であ
り、図4と同一の符号は同一の部材を示しているので説
明を省略する。そして、回転軸1とスリーブ2の嵌合隙
間には、微粒粉末Pを混入したグリースGが注入されて
いる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a cross-sectional view of the first embodiment, and the same reference numerals as those in FIG. Then, the grease G mixed with the fine powder P is injected into the fitting gap between the rotary shaft 1 and the sleeve 2.
【0010】微粒粉末Pを混入したグリースGが、回転
軸1とスリーブ2の隙間に図2に示すように注入される
と、グリースGが高温になって軸受の保持力が低下し外
部から振動が加わっても、微粒粉末Pの存在によりかじ
り現象を発生せず良好な潤滑性を保持することができ
る。When the grease G containing the fine powder P is injected into the gap between the rotating shaft 1 and the sleeve 2 as shown in FIG. However, even if added, the galling phenomenon does not occur due to the presence of the fine powder P, and good lubricity can be maintained.
【0011】図3は他の実施例を示し、微粒粉末Pのコ
ーティングの方法として、例えば無電解Ni−P鍍金を
使用すれば、図3に示すように微粒粉末Pをスリーブ2
に鍍金層Cを用いてコーティングすることができる。な
お、この鍍金層Cは回転軸1に対して形成することもで
きる。FIG. 3 shows another embodiment. As a method of coating the fine powder P, for example, if electroless Ni-P plating is used, the fine powder P is sleeved as shown in FIG.
Can be coated with a plating layer C. The plating layer C can also be formed on the rotary shaft 1.
【0012】このようにすることによっても、高温で軸
受の保持力が低下し外部から振動が加わった場合に、微
粒粉末Pの存在によりかじり現象が発生せず、良好な潤
滑性を保持することができる。[0012] By doing so as well, when the holding force of the bearing is reduced at high temperature and vibration is applied from the outside, the galling phenomenon does not occur due to the presence of the fine powder P, and good lubricity is maintained. You can
【0013】微粒粉末Pは潤滑効果を有するダイヤモン
ドを用いることで特に効果を発揮する。このダイヤモン
ドは例えば最近不活性ガスを満たした爆発室の中で、T
NT火薬(爆発性物質)を爆発させて合成されるものが
用いることができる。また、微粒粉末Pの形状をダイヤ
モンドを核として、周りに黒鉛を被膜したグラファイト
ダイヤモンドにすることでも更に上述の効果が向上す
る。The fine powder P is particularly effective when diamond having a lubricating effect is used. This diamond, for example, was
What is synthesized by exploding NT explosive (explosive substance) can be used. Further, the above-mentioned effect is further improved by using the shape of the fine-grained powder P as graphite diamond having diamond as a nucleus and graphite coated around the diamond.
【0014】なお、微粒粉末Pは超微粒である40〜7
0オングストローム程度の粒径にすることで、グリース
Gの粘性抵抗を殆ど上昇させることがなくなり、低温時
における動圧軸受装置の定格回転までの立ち上がり時間
を、未混入グリースの場合とほぼ同等にすることができ
る。The fine powder P is 40 to 7 which is an ultra fine grain.
By setting the particle size to about 0 angstrom, the viscosity resistance of the grease G is hardly increased, and the rise time until the rated rotation of the dynamic pressure bearing device at low temperature is almost the same as that of the unmixed grease. be able to.
【0015】[0015]
【発明の効果】以上説明したように本発明に係る動圧軸
受装置は、軸とスリーブの嵌合隙間に注入する潤滑油に
微粉粒子を混入、又は軸或いはグリースの少なくとも一
方にコーティングすることによって、高温時に外部から
振動が加わった場合の軸とスリーブのかじり現象を防止
することができる。As described above, in the hydrodynamic bearing device according to the present invention, fine powder particles are mixed into the lubricating oil injected into the fitting gap between the shaft and the sleeve, or at least one of the shaft and the grease is coated. It is possible to prevent the galling phenomenon of the shaft and the sleeve when external vibration is applied at high temperature.
【図面の簡単な説明】[Brief description of drawings]
【図1】実施例の軸受装置の構成図である。FIG. 1 is a configuration diagram of a bearing device according to an embodiment.
【図2】軸受部の拡大断面図である。FIG. 2 is an enlarged sectional view of a bearing portion.
【図3】他の実施例の軸受部の拡大図である。FIG. 3 is an enlarged view of a bearing portion of another embodiment.
【図4】一般的な動圧軸受装置の構成図である。FIG. 4 is a configuration diagram of a general dynamic pressure bearing device.
1 回転軸 2 スリーブ 3 スラスト板 4 固定板 5 外筒 6 フランジ 7 駆動マグネット 8 ロータヨーク 9 ステータコイル 10 回転多面鏡 G グリース P 微粒粉末 C 鍍金層 1 rotating shaft 2 sleeve 3 thrust plate 4 fixing plate 5 outer cylinder 6 flange 7 drive magnet 8 rotor yoke 9 stator coil 10 rotating polygon mirror G grease P fine grain powder C plating layer
Claims (3)
とを有し、前記軸の外周面と前記スリーブの内周面との
間に浅溝を形成し、嵌合隙間に潤滑油を注入し、動圧発
生部を有する動圧軸受装置において、前記嵌合隙間に注
入された潤滑油の中に微粒粉末を混入するか、又は前記
軸或いは前記スリーブの少なくとも一方に前記微粒粉末
をコーティングしたことを特徴とする動圧軸受装置。1. A shaft and a sleeve which are rotatably fitted to each other, a shallow groove is formed between an outer peripheral surface of the shaft and an inner peripheral surface of the sleeve, and lubricating oil is provided in a fitting gap. In a hydrodynamic bearing device having a hydrodynamic pressure injection portion, fine powder is mixed into the lubricating oil injected into the fitting gap, or at least one of the shaft or the sleeve is coated with the fine powder. A hydrodynamic bearing device characterized in that
請求項1に記載の動圧軸受装置。2. The hydrodynamic bearing device according to claim 1, wherein the fine powder is diamond powder.
ストロームとした請求項1に記載の動圧軸受装置。3. The hydrodynamic bearing device according to claim 1, wherein the fine powder has a particle size of 40 to 70 angstroms.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24560292A JPH0666316A (en) | 1992-08-21 | 1992-08-21 | Dynamic pressure bearing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24560292A JPH0666316A (en) | 1992-08-21 | 1992-08-21 | Dynamic pressure bearing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0666316A true JPH0666316A (en) | 1994-03-08 |
Family
ID=17136166
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24560292A Pending JPH0666316A (en) | 1992-08-21 | 1992-08-21 | Dynamic pressure bearing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0666316A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0727131A (en) * | 1993-05-12 | 1995-01-27 | Ricoh Co Ltd | Manufacture of dynamic pressure air bearing device and dynamic pressure generating groove thereof |
-
1992
- 1992-08-21 JP JP24560292A patent/JPH0666316A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0727131A (en) * | 1993-05-12 | 1995-01-27 | Ricoh Co Ltd | Manufacture of dynamic pressure air bearing device and dynamic pressure generating groove thereof |
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