JP2000154825A - Rolling bearing - Google Patents
Rolling bearingInfo
- Publication number
- JP2000154825A JP2000154825A JP10329220A JP32922098A JP2000154825A JP 2000154825 A JP2000154825 A JP 2000154825A JP 10329220 A JP10329220 A JP 10329220A JP 32922098 A JP32922098 A JP 32922098A JP 2000154825 A JP2000154825 A JP 2000154825A
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- rolling bearing
- bearing
- cemented carbide
- cost
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、転がり軸受、特に
磁場環境での使用に適した転がり軸受に関する。The present invention relates to a rolling bearing, and more particularly to a rolling bearing suitable for use in a magnetic field environment.
【０００２】[0002]
【従来の技術】上述したような磁場環境で使用する転が
り軸受の場合、内輪、外輪、転動体、保持器などの構成
要素を、通常、オーステナイト系の非磁性ステンレス鋼
（ＪＩＳ規格ＳＵＳ３０４）で形成するようにしてい
る。なお、保持器については、合成樹脂材で形成するこ
とが多い。2. Description of the Related Art In the case of a rolling bearing used in a magnetic field environment as described above, components such as an inner ring, an outer ring, a rolling element, and a retainer are usually formed of austenitic non-magnetic stainless steel (JIS standard SUS304). I am trying to do it. The retainer is often formed of a synthetic resin material.
【０００３】前述のオーステナイト系の非磁性ステンレ
ス鋼は、比透磁率が１．００２〜１．０４であり、特
に、非磁性の要件が重要になるような場合には、比透磁
率が１にきわめて近いベリリウム銅や窒化けい素系のセ
ラミックスを使用するのが好ましい。The aforementioned austenitic non-magnetic stainless steel has a relative magnetic permeability of 1.002 to 1.04. In particular, when the requirement of non-magnetic properties becomes important, the relative magnetic permeability is reduced to 1. It is preferable to use very close beryllium copper or silicon nitride ceramics.
【０００４】ちなみに、前述のベリリウム銅の比透磁率
は１．０００００４で、窒化けい素系のセラミックスの
比透磁率は０．９９９９９９１である。Incidentally, the relative magnetic permeability of the aforementioned beryllium copper is 1.000004, and the relative magnetic permeability of silicon nitride ceramics is 0.99999991.
【０００５】[0005]
【発明が解決しようとする課題】ところで、上述したベ
リリウム銅を軸受構成要素の素材とする場合、硬度がＨ
ｖ（ビッカース硬さ試験）４３０程度であって、一般的
な軸受鋼に比べて耐荷重性が劣るので、一時的でも高負
荷がかかるような使用条件だと早期段階で転がり特性が
低下しやすくなる。When the above-mentioned beryllium copper is used as a material for a bearing component, the hardness of the material is H.
v (Vickers hardness test) is about 430, and the load resistance is inferior to that of general bearing steel. Therefore, the rolling characteristics are apt to be deteriorated at an early stage under operating conditions under which a high load is applied even temporarily. Become.
【０００６】これに対して、上述した窒化けい素系のセ
ラミックスを軸受構成要素の素材とする場合には、硬度
がＨＶ１４００〜１７００であるので、十分な耐荷重性
を有しているものの、その製造工程がきわめて面倒であ
ってきわめて高コスト化することがネックになる。On the other hand, when the above-described silicon nitride-based ceramics is used as a material of a bearing component, the hardness is HV1400 to 1700, so that although it has a sufficient load resistance, The bottleneck is that the manufacturing process is extremely troublesome and extremely expensive.
【０００７】したがって、本発明は、転がり軸受におい
て、非磁性ならびに耐荷重性に優れていながら、コスト
的にも有利な構造とすることを目的としている。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rolling bearing having a structure which is excellent in terms of cost while being excellent in non-magnetism and load resistance.
【０００８】[0008]
【課題を解決するための手段】請求項１にかかる発明の
転がり軸受は、軌道輪または転動体の少なくともいずれ
かが、Ｎｉを結合相とするＷＣ−Ｎｉ系超硬合金で形成
されている。According to a first aspect of the present invention, at least one of the bearing ring and the rolling element is formed of a WC-Ni cemented carbide having Ni as a bonding phase.
【０００９】請求項２にかかる発明の転がり軸受は、軌
道輪がＮｉを結合相とするＷＣ−Ｎｉ系超硬合金で形成
され、転動体が非磁性のセラミックスで形成されてい
る。In the rolling bearing according to the second aspect of the invention, the race is formed of a WC-Ni cemented carbide having Ni as a bonding phase, and the rolling elements are formed of non-magnetic ceramics.
【００１０】要するに、本発明では、軸受構成要素の材
料として、非磁性、耐荷重性に優れていながらも、製造
が比較的簡易になることの条件を満足するＷＣ−Ｎｉ系
超硬合金を見いだした。このＷＣ−Ｎｉ系超硬合金は、
一般的に軸受材料として使用されていない。In short, the present invention finds a WC-Ni-based cemented carbide as a material of a bearing component, which satisfies the condition that the production is relatively easy, while being excellent in non-magnetism and load resistance. Was. This WC-Ni-based cemented carbide is
Generally not used as bearing material.
【００１１】特に、請求項２の発明では、転動体を、質
量が種々な非磁性金属材に比べて小さいセラミックスと
しているので、高速回転域での転動体の転がり特性が良
好になる。In particular, according to the second aspect of the present invention, since the rolling elements are made of ceramics whose mass is smaller than that of various non-magnetic metal materials, the rolling characteristics of the rolling elements in a high-speed rotation range are improved.
【００１２】[0012]
【発明の実施の形態】本発明の詳細を図面に示す実施形
態に基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described based on embodiments shown in the drawings.
【００１３】図１は本発明の一実施形態にかかる転がり
軸受の縦断側面図である。図中、１は転がり軸受の全体
を示しており、ここでは深溝玉軸受を例に挙げている。FIG. 1 is a longitudinal sectional side view of a rolling bearing according to an embodiment of the present invention. In the drawing, reference numeral 1 denotes the entire rolling bearing, and here, a deep groove ball bearing is taken as an example.
【００１４】転がり軸受１は、内輪２と、外輪３と、複
数個の転動体４と、冠形の保持器５とを備えている。The rolling bearing 1 includes an inner ring 2, an outer ring 3, a plurality of rolling elements 4, and a crown-shaped retainer 5.
【００１５】これらの軸受構成要素は、すべて非磁性材
で形成される。例えば内・外輪２，３および転動体４
は、Ｎｉを結合相とするＷＣ−Ｎｉ系超硬合金で形成さ
れ、また、保持器５は、合成樹脂（例えばふっ素系樹
脂）あるいはオーステナイト系の非磁性ステンレス鋼
（ＪＩＳ規格ＳＵＳ３０４）で形成される。These bearing components are all made of non-magnetic material. For example, inner and outer rings 2 and 3 and rolling elements 4
Is formed of a WC-Ni-based cemented carbide having Ni as a binder phase, and the retainer 5 is formed of a synthetic resin (for example, a fluorine-based resin) or an austenitic non-magnetic stainless steel (JIS standard SUS304). You.
【００１６】前述したＷＣ−Ｎｉ系超硬合金としては、
例えば冨士ダイス株式会社製の商品名フジロイＭ４５，
Ｍ７０などが挙げられる。これらの材料の比透磁率は
１．０００２であり、また、硬度はＨｖ（ビッカース硬
さ試験）１１００〜１４００である。The WC-Ni-based cemented carbide described above includes:
For example, Fujiroy M45 manufactured by Fuji Dice Co., Ltd.
M70 and the like. The relative magnetic permeability of these materials is 1.0002, and the hardness is Hv (Vickers hardness test) 1100 to 1400.
【００１７】そして、前述の材料で内・外輪２，３や転
動体４を製作する場合、窒化けい素セラミックスで内・
外輪２，３や転動体４を製作する場合とほぼ同様の手法
が採用される。すなわち、原料粉末を所定の組成になる
ように均一に混合した後、成形体の強度を維持するため
の粘結材（バインダー）を少量添加し、油圧または機械
プレスで成形する。最終形状によっては、その後、さら
に旋盤などで加工してもよい。次に、真空炉中で焼結
後、材料中にわずかに生じる微小な欠陥を消滅させるた
め、ＨＩＰ（熱間静水圧加圧焼結）処理を行う。When the inner and outer races 2 and 3 and the rolling elements 4 are manufactured from the above-described materials, the inner and outer races 2 and 3 and the rolling elements 4 are made of silicon nitride ceramic.
Almost the same method as in the case of manufacturing the outer races 2 and 3 and the rolling elements 4 is adopted. That is, after the raw material powders are uniformly mixed so as to have a predetermined composition, a small amount of a binder for maintaining the strength of the molded body is added, and molding is performed by hydraulic or mechanical press. Depending on the final shape, it may be further processed with a lathe or the like. Next, after sintering in a vacuum furnace, HIP (Hot Isostatic Pressure Sintering) processing is performed in order to eliminate minute defects that occur slightly in the material.
【００１８】本材料の原料粉末としては、ＷＣ（粒度
０．５〜１μｍ）、Ｎｉ（粒度１〜１．５μｍ）、Ｃｒ
3Ｃ2（粒度１〜２μｍ）、Ｍｏ2Ｃ（粒度１．５〜２．
５μｍ）を用いる。これらの粉末を、以下の組成で混合
する。すなわち、Ｎｉ：１０〜１５ｗｔ％、Ｃｒ3Ｃ2：
１〜２ｗｔ％、Ｍｏ2Ｃ：１％以下、ＷＣ：残部とする
割合で原料粉末を混合する。The raw material powders of the present material include WC (particle size 0.5-1 μm), Ni (particle size 1-1.5 μm), Cr
3 C 2 (grain size 1-2 μm), Mo 2 C (grain size 1.5-2.
5 μm). These powders are mixed with the following composition. That is, Ni: 10 to 15 wt%, Cr 3 C 2 :
Raw material powders are mixed at a ratio of 1 to 2 wt%, Mo 2 C: 1% or less, and WC: balance.
【００１９】また、本材料の焼結およびＨＩＰの条件
は、焼結温度が約１４００〜１４５０℃、ＨＩＰ温度が
１３５０〜１４００℃、ＨＩＰ圧力が約１０００気圧で
あるのに対し、一般的なセラミックスの焼結およびＨＩ
Ｐの条件は、焼結温度が１５００〜１８００℃、ＨＩＰ
温度が１４５０〜１５００℃、ＨＩＰ圧力が１５００〜
２０００気圧であり、本材料では、一般的なセラミック
スを製造する場合に比べて温度、圧力共に低い条件に設
定できるので、焼結にかかるコストを安くできるように
なる。The conditions for sintering and HIP of this material are as follows: the sintering temperature is about 1400-1450 ° C., the HIP temperature is 1350-1400 ° C., and the HIP pressure is about 1000 atm. Sintering and HI
The conditions of P are as follows: the sintering temperature is 1500 to 1800 ° C., HIP
Temperature 1450-1500 ° C, HIP pressure 1500-
The pressure is 2,000 atm. With this material, both the temperature and the pressure can be set lower than those in the case of producing a general ceramic, so that the cost for sintering can be reduced.
【００２０】さらに、本材料は、一般的に、セラミック
ス材料よりもはるかに靭性が大きく、焼結後の加工時に
欠けや割れが発生しにくいため、歩留まりが良好で、か
つラフな加工ができるため、加工時間も短縮される。Further, the present material generally has much higher toughness than the ceramic material and is less likely to chip or crack during processing after sintering, so that the yield is good and rough processing can be performed. Also, the processing time is shortened.
【００２１】以上のように、本材料は、セラミックス材
料で転がり軸受１を製作する場合に比べて、焼結、加工
の双方でコストを低くできるので、安価に製作できる。As described above, the present material can be manufactured at low cost because the cost can be reduced in both sintering and working as compared with the case where the rolling bearing 1 is manufactured from a ceramic material.
【００２２】このような転がり軸受１では、強磁場での
使用に適していて、しかも一時的に高負荷がかかるよう
な条件での使用にも適したものとなる。具体的に、上記
転がり軸受１は、例えばＭＲＩ（磁気共鳴装置）、ＳＥ
Ｍ（走査型電子顕微鏡）などの回転支持部や揺動支持部
などに使用される。Such a rolling bearing 1 is suitable for use in a strong magnetic field, and is also suitable for use under conditions where a high load is temporarily applied. Specifically, the rolling bearing 1 is, for example, an MRI (Magnetic Resonance Apparatus), SE
It is used for a rotary support part such as M (scanning electron microscope) or a swing support part.
【００２３】なお、本発明は上記実施形態のみに限定さ
れず、種々な応用や変形が考えられる。It should be noted that the present invention is not limited to the above-described embodiment, and various applications and modifications are conceivable.
【００２４】（１） 上記実施形態では、深溝玉軸受を
例に挙げているが、ころ軸受や円錐ころ軸受など種々な
タイプの転がり軸受に本発明を適用できる。(1) In the above embodiment, a deep groove ball bearing is taken as an example. However, the present invention can be applied to various types of rolling bearings such as a roller bearing and a tapered roller bearing.
【００２５】（２） 上記実施形態では、内・外輪２，
３および転動体４のすべてをＷＣ−Ｎｉ系超硬合金で形
成した例を挙げているが、転動体４のみを窒化けい素系
のセラミックスで形成する組み合わせ形態としたり、あ
るいは内輪２および転動体４の２つを窒化けい素系のセ
ラミックスで形成する組み合わせ形態としたりすること
ができる。なお、セラミックス製の転動体４は、既に規
格品として量産されているものを流用すれば、コストの
著しい増加を抑制できる。この場合、上記実施形態に比
べて耐荷重性の向上が可能になる。また、セラミックス
製転動体４は、質量が種々な非磁性金属材に比べて小さ
いので、高速回転域での転動体４の転がり特性が良好に
なり、耐焼付性が向上する。(2) In the above embodiment, the inner and outer rings 2
3 and the rolling element 4 are all formed of a WC-Ni-based cemented carbide, but the rolling element 4 may be formed of a combination of silicon nitride ceramics, or the inner ring 2 and the rolling element 4 may be formed in a combination form in which silicon nitride ceramics are formed. If the rolling elements 4 made of ceramics are mass-produced as standard products, a remarkable increase in cost can be suppressed. In this case, the load resistance can be improved as compared with the above embodiment. In addition, since the ceramic rolling element 4 has a smaller mass than various non-magnetic metal materials, the rolling characteristics of the rolling element 4 in a high-speed rotation range are improved, and seizure resistance is improved.
【００２６】[0026]
【発明の効果】請求項１または２の発明の転がり軸受で
は、その構成要素の材料を特定することにより、強磁場
でかつ高負荷条件となる用途での使用に適していなが
ら、セラミックス材に比べて簡易に製造できるようにな
って、コスト低減が可能になる。このように本発明は、
安価でありながら、強磁場および高負荷条件といった特
殊な状況での使用に十分な耐久性を発揮する転がり軸受
を提供できるようになる。According to the rolling bearing according to the first or second aspect of the present invention, by specifying the material of the constituent elements, the rolling bearing is suitable for use in an application under a strong magnetic field and under a high load condition. As a result, it is possible to manufacture easily and cost can be reduced. Thus, the present invention
It is possible to provide a rolling bearing that is inexpensive but has sufficient durability for use in special situations such as a strong magnetic field and high load conditions.
【００２７】特に、請求項２の発明では、転動体を質量
が種々な非磁性金属材に比べて小さいセラミックスとす
るので、高速回転域での転動体の転がり特性が良好にな
り、耐焼付性に関して有利になる。In particular, according to the second aspect of the present invention, since the rolling elements are made of ceramics having a smaller mass than various non-magnetic metal materials, the rolling characteristics of the rolling elements in a high-speed rotation range are improved, and seizure resistance is improved. Will be advantageous with respect to
【図１】本発明の転がり軸受の一実施形態の縦断面図FIG. 1 is a longitudinal sectional view of one embodiment of a rolling bearing of the present invention.
１ 転がり軸受 ２ 内輪 ３ 外輪 ４ 転動体 ５ 保持器 DESCRIPTION OF SYMBOLS 1 Rolling bearing 2 Inner ring 3 Outer ring 4 Rolling element 5 Cage
フロントページの続き (72)発明者 北村 和久 大阪市中央区南船場三丁目５番８号 光洋 精工株式会社内 (72)発明者 林田 一徳 大阪市中央区南船場三丁目５番８号 光洋 精工株式会社内 (72)発明者 矢坂 幹雄 神奈川県秦野市平沢36−１ 冨士ダイス株 式会社秦野工場内 Ｆターム(参考） 3J101 AA02 AA32 AA42 AA52 AA62 BA10 BA70 EA12 EA44 FA31 FA44 Continuing on the front page (72) Inventor Kazuhisa Kitamura 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Inside Koyo Seiko Co., Ltd. (72) Inventor Kazunori Hayashi 3-5-8 Minamisenba, Chuo-ku, Osaka-shi Inside Koyo Seiko Co., Ltd. (72) Inventor Mikio Yasaka 36-1 Hirasawa, Hadano-shi, Kanagawa Prefecture F-term in Hadano Plant of Fuji Dice Co., Ltd. (reference) 3J101 AA02 AA32 AA42 AA52 AA62 BA10 BA70 EA12 EA44 FA31 FA44
Claims (2)
が、Ｎｉを結合相とするＷＣ−Ｎｉ系超硬合金で形成さ
れている、ことを特徴とする転がり軸受。1. A rolling bearing, wherein at least one of a bearing ring and a rolling element is formed of a WC-Ni-based cemented carbide having Ni as a binder phase.
超硬合金で形成され、転動体が非磁性のセラミックスで
形成されている、ことを特徴とする転がり軸受。2. A rolling bearing, wherein the bearing ring is formed of a WC-Ni cemented carbide having Ni as a bonding phase, and the rolling elements are formed of non-magnetic ceramics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10329220A JP2000154825A (en) | 1998-11-19 | 1998-11-19 | Rolling bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10329220A JP2000154825A (en) | 1998-11-19 | 1998-11-19 | Rolling bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000154825A true JP2000154825A (en) | 2000-06-06 |
Family
ID=18219002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10329220A Pending JP2000154825A (en) | 1998-11-19 | 1998-11-19 | Rolling bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000154825A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004055399A1 (en) * | 2002-12-16 | 2004-07-01 | Nsk Ltd. | Four-point contact bearing |
| CN107939829A (en) * | 2016-08-23 | 2018-04-20 | 宋震天 | A kind of motor bearings |
-
1998
- 1998-11-19 JP JP10329220A patent/JP2000154825A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004055399A1 (en) * | 2002-12-16 | 2004-07-01 | Nsk Ltd. | Four-point contact bearing |
| CN107939829A (en) * | 2016-08-23 | 2018-04-20 | 宋震天 | A kind of motor bearings |
| CN107939829B (en) * | 2016-08-23 | 2019-05-17 | 扬州英泰机械有限公司 | A kind of motor bearings |
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