JPH08548U - Rolling bearing - Google Patents
Rolling bearingInfo
- Publication number
- JPH08548U JPH08548U JP047522U JP4752291U JPH08548U JP H08548 U JPH08548 U JP H08548U JP 047522 U JP047522 U JP 047522U JP 4752291 U JP4752291 U JP 4752291U JP H08548 U JPH08548 U JP H08548U
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- corrosion resistance
- chromium
- rolling
- steel
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
- F16C25/06—Ball or roller bearings
- F16C25/08—Ball or roller bearings self-adjusting
- F16C25/083—Ball or roller bearings self-adjusting with resilient means acting axially on a race ring to preload the bearing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
- F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/54—Systems consisting of a plurality of bearings with rolling friction
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Support Of The Bearing (AREA)
- Rolling Contact Bearings (AREA)
Abstract
(57)【要約】
【目的】 耐蝕性と低騒音性とを有する転がり軸受を提
供する。
【構成】 ステンレス鋼には炭素とクロムの共晶による
巨大炭化物が多く存在している。ステンレス鋼を用いた
軸受は、この巨大炭化物の存在により、音響特性が一般
の軸受に比べて悪い。巨大炭化物をなくすには、クロム
の含有量を減らす必要があるが、その一方で、クロム含
有量を減らしすぎると耐蝕性が低下する。本考案は、大
気中の結露等の環境下でも耐蝕性が得られる程度のクロ
ム含有量をもつマルテンサイト系のステンレス鋼で内・
外輪を形成すると共に、転動体が軸受内の潤滑剤により
耐蝕性が確保されることに着目し、転動体は軸受鋼で形
成するようにした。これにより、内・外輪に巨大炭化物
が残存していたとしても、転動接触面間における巨大炭
化物同士の接触が起こらないため、その音響特性に及ぼ
す影響が縮小化される。本考案に係わる軸受（線図１お
よび線図２）は、軸受鋼のみで形成した軸受（線図３）
とほぼ同程度の良好な音響特性を示す。
(57) [Abstract] [Purpose] To provide a rolling bearing having corrosion resistance and low noise. [Structure] In stainless steel, there are many large carbides due to the eutectic of carbon and chromium. The bearing made of stainless steel has poor acoustic characteristics as compared with a general bearing due to the presence of the giant carbide. In order to eliminate the giant carbide, it is necessary to reduce the content of chromium, but on the other hand, if the content of chromium is reduced too much, the corrosion resistance decreases. The present invention is a martensitic stainless steel having a chromium content such that corrosion resistance is obtained even in an environment such as dew condensation in the atmosphere.
While forming the outer ring, the rolling elements are made of bearing steel, paying attention to the fact that the corrosion resistance of the rolling elements is secured by the lubricant in the bearing. As a result, even if the large carbides remain on the inner and outer rings, the large carbides do not come into contact with each other between the rolling contact surfaces, so that the influence on the acoustic characteristics is reduced. The bearing according to the present invention (diagram 1 and diagram 2) is a bearing formed only of bearing steel (diagram 3).
It shows good acoustic characteristics, which is almost the same as
Description
【０００１】[0001]
本考案は、ハ−ドディスクドライブ（ＨＤＤ）のスピンドルモ−タに使用され る軸受等のように、耐蝕性と低騒音性とが要求される環境下で使用される転がり 軸受に関する。 The present invention relates to a rolling bearing used in an environment where corrosion resistance and low noise are required, such as a bearing used in a spindle motor of a hard disk drive (HDD).
【０００２】[0002]
軸受は一般に軸受鋼で形成されるが、特に耐蝕性を必要とされる環境下で使用 される場合には、マルテンサイト系ステンレス鋼等の耐蝕性材料を用いて形成さ れる。しかしながら、この耐蝕性材料は炭素とクロムとを含有した鋼であり、炭 素とクロムとの共晶により生じた巨大炭化物が多く存在しているため、加工性が 悪く、特に鋼球の精度を向上させることができない。そのため、この耐蝕性材料 を使用した軸受の音響特性は、一般の軸受鋼を使用した軸受の音響特性に比べて かなり劣ることが知られている。 The bearing is generally made of bearing steel, but when used in an environment where corrosion resistance is required, it is made of a corrosion resistant material such as martensitic stainless steel. However, this corrosion resistant material is a steel containing carbon and chromium, and since there are many large carbides formed by the eutectic of carbon and chromium, the workability is poor, and the precision of steel balls is particularly high. Cannot be improved. Therefore, it is known that the acoustic characteristics of the bearing using this corrosion resistant material are considerably inferior to the acoustic characteristics of the bearing using general bearing steel.
【０００３】[0003]
ハ−ドディスクドライブに使用される軸受等のように、低騒音性と耐蝕性とが 同時に要求される環境下で使用される軸受の形成材料は、従来、低騒音性と耐蝕 性という相反する特性の要求度合いを比較考量して決定される場合が多かった。 つまり、 Conventionally, bearing materials used in environments where low noise and corrosion resistance are required at the same time, such as bearings used in hard disk drives, have been contradictory to low noise and corrosion resistance. In many cases, it was decided by comparing the required degree of characteristics. That is,
【０００４】 （１）低騒音性の要求が特に厳しく、耐蝕性は多少無視できる場合には軸受鋼 を使用する。(1) When the requirement for low noise is particularly strict and the corrosion resistance can be ignored to some extent, a bearing steel is used.
【０００５】 （２）特に耐蝕性の要求が厳しい場合にはステンレス鋼を使用する。(2) Stainless steel is used when the corrosion resistance is particularly demanding.
【０００６】 （３）低騒音性、耐蝕性の要求が共に厳しい場合には軸受鋼（転走面以外の部 分）に耐蝕メッキしたものを使用する。(3) If both low noise and corrosion resistance are strict requirements, a bearing steel (a part other than the rolling contact surface) that is corrosion-resistant plated is used.
【０００７】 この内、（３）に示すものによれば両特性を同時に満足させることができるが 、メッキ処理のための工数が余分にかかり、またメッキ処理後の軸受加工が困難 であるという問題点があった。Among these, according to the one shown in (3), both characteristics can be satisfied at the same time, but the man-hour for plating treatment is extra, and the bearing processing after plating treatment is difficult. There was a point.
【０００８】 そこで、本考案の目的は、低騒音性と耐蝕性という相反する特性を同時に具え た転がり軸受を提供することにある。Therefore, an object of the present invention is to provide a rolling bearing that has the contradictory characteristics of low noise and corrosion resistance.
【０００９】[0009]
本考案は、内・外側軌道面を構成する軸受構成部品がマルテンサイト系のステ ンレス鋼で形成され、内・外側軌道面間に介在する転動体が軸受鋼で形成された ことを特徴とする転がり軸受を提供する。 The present invention is characterized in that the bearing components constituting the inner and outer raceways are made of martensitic stainless steel, and the rolling elements interposed between the inner and outer raceways are made of bearing steel. Providing rolling bearings.
【００１０】[0010]
ステンレス鋼に存在する巨大炭化物をなくすには、クロムの含有量を減らす必 要がある。その一方で、クロム含有量を減らしすぎると耐蝕性が低下してしまう 。本考案は、大気中での結露等の環境下でも耐蝕性が得られる程度のクロム含有 量をもつマルテンサイト系のステンレス鋼で内・外側軌道面を構成する軸受構成 部品を形成し、転動体は軸受鋼で形成するようにした。軸受の音響特性には、軌 道面および転動体の精度（あらさ）の影響が大きく、特に転動体の精度の影響が 大きい。それ故、転動体を軸受鋼で形成することにより、転動体の精度を確保す ることができ、軸受の音響特性は向上する。また、内・外側軌道面を構成する軸 受構成部品に巨大炭化物が残存していたとしても、転動体には巨大炭化物が存在 しないため、転動接触面間における巨大炭化物同士の接触がなく、その音響特性 に及ぼす影響が縮小化される。一方、転動体はグリ−ス等の潤滑剤により実質的 に耐蝕性を確保されるから、転動体を軸受鋼で形成することによる耐蝕性低下は ない。 To eliminate the large carbides present in stainless steel, it is necessary to reduce the chromium content. On the other hand, if the chromium content is reduced too much, the corrosion resistance will decrease. The present invention forms a bearing component that constitutes the inner and outer raceways of martensite stainless steel with a chromium content that is sufficient to provide corrosion resistance even in the environment of dew condensation in the atmosphere, Is made of bearing steel. The acoustic characteristics of bearings are greatly affected by the accuracy (roughness) of the track surface and rolling elements, and particularly by the accuracy of rolling elements. Therefore, by forming the rolling elements of bearing steel, the accuracy of the rolling elements can be secured and the acoustic characteristics of the bearing are improved. Also, even if the giant carbide remains in the bearing components that form the inner and outer raceways, there is no giant carbide in the rolling elements, so there is no contact between the giant carbides between the rolling contact surfaces. Its impact on acoustic properties is reduced. On the other hand, since the rolling elements are substantially protected from corrosion by a lubricant such as grease, there is no deterioration in corrosion resistance due to the rolling steel being formed of bearing steel.
【００１１】[0011]
【実施例】 以下、本考案の実施例について説明する。Embodiments Embodiments of the present invention will be described below.
【００１２】 図１は、本考案を適用した精密シャフトユニットを示す。この精密シャフトユ ニットは、２列の軌道溝１ａが外周面に形成された軸１、軌道溝１ａに転動体３ を介して嵌着された外輪５、転動体３を円周等間隔に保持する保持器４、外輪５ の非対向側端部に装着された非接触シ−ル６、および外輪５間にバネ座15を介し て装着されたコイルバネ16で構成される。軸受内にはグリースが封入され、非接 触シール６により封止されている。また、軸受部を構成する軸１および外輪５は クロム含有量９〜１４％のマルテンサイト系ステンレス鋼で形成され、転動体３ は軸受鋼で形成されている。９〜１４％というクロム含有量は、軸受の耐蝕性を 確保しつつ、音響特性の向上を図るという観点から設定したものである。つまり 、クロム含有量が１４％以上であると耐蝕性は向上するが音響特性が低下する。 逆に、クロム含有量が９％以下であると音響特性は向上するが耐蝕性が低下して しまう。そこで、大気中での結露等の環境下でも十分な耐蝕性が得られ、かつ、 低騒音性を達成し得るクロム含有量として、上記範囲内の値を選定した。FIG. 1 shows a precision shaft unit to which the present invention is applied. This precision shaft unit holds a shaft 1 having two rows of raceway grooves 1a formed on the outer peripheral surface, an outer ring 5 fitted into the raceway groove 1a via rolling elements 3, and rolling elements 3 at equal intervals around the circumference. It is composed of a cage 4, a non-contact seal 6 mounted on the non-opposing side end of the outer ring 5, and a coil spring 16 mounted via a spring seat 15 between the outer rings 5. Grease is filled in the bearing and sealed by a non-contact seal 6. Further, the shaft 1 and the outer ring 5 constituting the bearing portion are made of martensitic stainless steel having a chromium content of 9 to 14%, and the rolling elements 3 are made of bearing steel. The chromium content of 9 to 14% is set from the viewpoint of improving the acoustic characteristics while ensuring the corrosion resistance of the bearing. That is, when the chromium content is 14% or more, the corrosion resistance is improved but the acoustic characteristics are deteriorated. On the other hand, when the chromium content is 9% or less, the acoustic characteristics are improved but the corrosion resistance is lowered. Therefore, a value within the above range was selected as the chromium content that can obtain sufficient corrosion resistance even in the environment such as dew condensation in the atmosphere and can achieve low noise.
【００１３】 図２は、内・外輪がマルテンサイト系ステンレス鋼で形成され、転動体が軸受 鋼で形成された深溝玉軸受について行なった騒音測定結果を示す。尚、同図で、 線図１はクロム含有量が１０％の上記軸受、線図２はクロム含有量が１３％の上 記軸受、線図３は軸受鋼（ＳＵＪ２）のみを用いた軸受、線図４は内・外輪およ び転動体をマルテンサイト系ステンレス鋼のＳＵＳ４４０Ｃで形成した軸受につ いての騒音測定結果を示す。測定結果から明らかなように、本考案に係わる転が り軸受は良好な音響特性を示す。FIG. 2 shows the results of noise measurement performed on a deep groove ball bearing in which the inner and outer rings are made of martensitic stainless steel and the rolling elements are made of bearing steel. In the figure, line 1 is the above bearing having a chromium content of 10%, line 2 is the above bearing having a chromium content of 13%, and line 3 is a bearing using only bearing steel (SUJ2). Diagram 4 shows the noise measurement results for the bearings whose inner and outer rings and rolling elements were made of martensitic stainless steel SUS440C. As is clear from the measurement results, the rolling bearing according to the present invention exhibits good acoustic characteristics.
【００１４】[0014]
以上説明したように、本考案は、内・外側軌道面を構成する軸受構成部品をマ ルテンサイト系ステンレス鋼で形成することによって軸受の耐蝕性を確保すると 同時に、転動体を軸受鋼で形成することによって、転動接触面間における巨大炭 化物同士の接触が起こらないようにした。したがって、本考案によれば、耐蝕性 および音響特性に優れた転がり軸受を提供することができる。 As described above, according to the present invention, the bearing components constituting the inner and outer raceways are made of martensitic stainless steel to ensure the corrosion resistance of the bearing, and at the same time, the rolling elements are made of bearing steel. As a result, the contact of giant carbides between rolling contact surfaces was prevented. Therefore, according to the present invention, it is possible to provide a rolling bearing having excellent corrosion resistance and acoustic characteristics.
【図１】本考案の実施例を示す断面図である。FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
【図２】騒音測定結果を示す線図である。FIG. 2 is a diagram showing a noise measurement result.
１ 軸 １ａ 軌道溝 ３ 転動体 ５ 外輪 1 shaft 1a raceway groove 3 rolling element 5 outer ring
Claims (1)
がマルテンサイト系のステンレス鋼で形成され、内・外
側軌道面間に介在する転動体が軸受鋼で形成されたこと
を特徴とする転がり軸受。1. A bearing component constituting the inner and outer raceways is made of martensitic stainless steel, and rolling elements interposed between the inner and outer raceways are made of bearing steel. Rolling bearing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3-17027 | 1991-02-27 | ||
| JP017027U JPH08547U (en) | 1991-02-27 | 1991-02-27 | Rolling bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08548U true JPH08548U (en) | 1996-03-26 |
| JP2564193Y2 JP2564193Y2 (en) | 1998-03-04 |
Family
ID=11932517
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP017027U Pending JPH08547U (en) | 1991-02-27 | 1991-02-27 | Rolling bearing |
| JP1991047522U Expired - Lifetime JP2564193Y2 (en) | 1991-02-27 | 1991-06-24 | Ball bearings for spindle motors of information equipment |
| JP005378U Pending JPH10193U (en) | 1991-02-27 | 1997-06-23 | Ball bearings for hard disk drive spindle motors |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP017027U Pending JPH08547U (en) | 1991-02-27 | 1991-02-27 | Rolling bearing |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP005378U Pending JPH10193U (en) | 1991-02-27 | 1997-06-23 | Ball bearings for hard disk drive spindle motors |
Country Status (1)
| Country | Link |
|---|---|
| JP (3) | JPH08547U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0235973U (en) * | 1988-08-25 | 1990-03-08 |
-
1991
- 1991-02-27 JP JP017027U patent/JPH08547U/en active Pending
- 1991-06-24 JP JP1991047522U patent/JP2564193Y2/en not_active Expired - Lifetime
-
1997
- 1997-06-23 JP JP005378U patent/JPH10193U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0235973U (en) * | 1988-08-25 | 1990-03-08 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08547U (en) | 1996-03-26 |
| JPH10193U (en) | 1998-08-25 |
| JP2564193Y2 (en) | 1998-03-04 |
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