JPS6192322A - Bearing unit - Google Patents
Bearing unitInfo
- Publication number
- JPS6192322A JPS6192322A JP21212584A JP21212584A JPS6192322A JP S6192322 A JPS6192322 A JP S6192322A JP 21212584 A JP21212584 A JP 21212584A JP 21212584 A JP21212584 A JP 21212584A JP S6192322 A JPS6192322 A JP S6192322A
- Authority
- JP
- Japan
- Prior art keywords
- retainer
- chromium
- layer
- ceramic sintered
- chromium oxide
- 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
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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/38—Ball cages
- F16C33/44—Selection of substances
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の技術分野］
本発明は、転動子を保持するリテーナーを、酸化クロム
または窒化クロムの含ｉ２層を有するセラミックス焼結
体で構成してなるベアリング装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a bearing device in which a retainer for holding a rolling element is made of a ceramic sintered body having an i2-containing layer of chromium oxide or chromium nitride.
［発明の技術的青貝とその問題点］
近時、耐熱性、高温下における機械的強度および耐摩耗
性の良好なセラミックス焼結体が開光されたことにより
、ベアリング装置についてもセラミック化の検討がすす
められている。[Technical blue shell of the invention and its problems] Recently, ceramic sintered bodies with good heat resistance, mechanical strength at high temperatures, and abrasion resistance have been made available, and the use of ceramics in bearing devices is also being considered. Recommended.
一般にベアリング装置は、図面に示すように内輪、、外
輪２、転動子３およびこの転動子３を内輪、、外輪２間
で保持するりテーカ−４とから構成されている。Generally, a bearing device is composed of an inner ring, an outer ring 2, a rotor 3, and a taker 4 that holds the rotor 3 between the inner ring and the outer ring 2, as shown in the drawings.
このようなベアリング装置では、リテーナ−４が破損し
易く、また給電あるいは接地等のために電気伝導性が必
要とされることがあるところがら、内輪、、外輪２およ
び転動子３をセラミック焼結体で形成した場合であって
も、リテーナ−４だけは金属製とすることが酋通・であ
る。In such a bearing device, the retainer 4 is easily damaged, and electrical conductivity is sometimes required for power supply or grounding, but the inner ring, outer ring 2, and rollers 3 are made of ceramic sinter. Even if the retainer 4 is made of a solid body, it is recommended that only the retainer 4 be made of metal.
しかしながら、ベアリング装置の中では、転動子ととも
にリテーナ−が最も摩耗を受は易い部分であるため、こ
のようにリテーナ−のみを金［１とすることは、せっか
くのセラミック化の効果を減殺してしまうという難点が
あった。However, in a bearing device, the retainer is the part that is most susceptible to wear, along with the rolling elements, so making only the retainer of gold [1] reduces the effect of using ceramic. There was a problem with this.
［発明の目的］
本発明はこのような点に対処してなされたもので、耐摩
耗性に優れ、破壊し難く、しかも導電性を有するセラミ
ック焼結体からなるリテーナ−を備えたベアリング装置
を提供することを目的とする。[Object of the Invention] The present invention has been made to address the above-mentioned problems, and provides a bearing device equipped with a retainer made of a ceramic sintered body that has excellent wear resistance, is hard to break, and is electrically conductive. The purpose is to provide.
［発明の概要］
すなわち本発明のベアリング装置は、転動子を保持する
リテーナーが、表面に酸化クロムまたは窒化クロムの含
浸層を有するセラミックス焼結体からなることを特徴と
している。[Summary of the Invention] That is, the bearing device of the present invention is characterized in that the retainer that holds the rolling elements is made of a ceramic sintered body having a chromium oxide or chromium nitride impregnated layer on its surface.
本発明のベアリング装置におけるリテーナ−は、予めリ
テーナ−の形状に成形してなるセラミックス焼結体に、
液状のクロム酸または酸素の存在下で加熱することによ
り酸化するクロム化合物を含浸させ、酸素雰囲気中で加
熱して表面に酸化クロム層を形成することにより得られ
る。The retainer in the bearing device of the present invention is made of a ceramic sintered body formed in advance into the shape of the retainer.
It is obtained by impregnating liquid chromic acid or a chromium compound that oxidizes by heating in the presence of oxygen, and heating in an oxygen atmosphere to form a chromium oxide layer on the surface.
なお、この後、窒素を含む還元雰囲気で処理を施して表
面に窒化クロム層、または醇化クロム層と富化クロム層
の複合層を形成するようにしてもよい。Note that, after this, a treatment may be performed in a reducing atmosphere containing nitrogen to form a chromium nitride layer or a composite layer of a chromium chloride layer and an enriched chromium layer on the surface.
本発明の適用可能なセラミックス焼結体としては、アル
ミナ等の酸化物系セラミックス焼結体、窒化ケイ素、炭
化ケイ素等の非酸化物系セラミックス焼結体があげられ
るが、特に窒化ケイ素が好適している。Ceramic sintered bodies to which the present invention can be applied include oxide-based ceramic sintered bodies such as alumina, and non-oxide-based ceramic sintered bodies such as silicon nitride and silicon carbide, with silicon nitride being particularly preferred. ing.
本発明においてセラミックス焼結体へクロム正またはク
ロム化合物を被着させるには、クロム酸またはクロム化
合物に溶媒または分散媒を加えて液状にし、その中にセ
ラミックス焼結体を浸漬するか、あるいはこれをセラミ
ックス焼結体に塗布することにより行なわれる。なお前
記の液状物に酸化亜鉛等の金汎酸化物を添加することに
より、接合強度を一層増大させることもできる。In the present invention, in order to deposit chromium positive or a chromium compound on a ceramic sintered body, a solvent or a dispersion medium is added to chromic acid or a chromium compound to make it liquid, and the ceramic sintered body is immersed in it, or the chromium compound is liquefied. This is done by coating a ceramic sintered body with: Note that the bonding strength can be further increased by adding a gold pan-oxide such as zinc oxide to the liquid material.
上記のようにしてセラミックス焼結体に被着させたクロ
ム酸等を酸化するには、酸素含有雰囲気中で４００〜７
９０℃のｉｆｉ度で、１〜１２０分間加熱すればよい。In order to oxidize the chromic acid etc. deposited on the ceramic sintered body as described above, it is necessary to
It may be heated at an ifi degree of 90°C for 1 to 120 minutes.
このようにして形成された酸化クロム層を、窒化クロム
に変化させるには、この酸化クロム層の形成されたセラ
ミックス焼結体を、窒素を含み、かつ水素、−Ｍ化炭素
等の還元雰囲気中で１，０００〜１，５００℃の温度で
、１〜１２０分間加熱して還元処理を行なえばよい。In order to change the chromium oxide layer thus formed into chromium nitride, the ceramic sintered body on which the chromium oxide layer has been formed is placed in a reducing atmosphere containing nitrogen and containing hydrogen, -M carbon, etc. The reduction treatment may be performed by heating at a temperature of 1,000 to 1,500° C. for 1 to 120 minutes.
この時酸化クロム層の窒化クロムへの変化は表面から行
なわれるので、酸化クロム層が厚さ方向に連続的に窒化
クロム層に変化することになり、下地のセラミックス焼
結体との密着性の良い、すなわち接合強度の大きい窒化
クロム層が形成される。At this time, the chromium oxide layer changes to chromium nitride from the surface, so the chromium oxide layer changes into a chromium nitride layer continuously in the thickness direction, which improves the adhesion to the underlying ceramic sintered body. A chromium nitride layer with good bonding strength is formed.
このようにして形成された酸化クロム層または窒化クロ
ム層は、非常に高い硬度を有しており、またセラミック
ス焼結体中に含浸されてこれを緻密化しているので、強
靭なリテーナーを１ｑることができる。なお、このリテ
ーナ−と組合されてベアリング装置を構成する内輪、外
輪および転動子は、セラミックス焼結体とすることが望
ましいが一部を金泥製としてもよい。The chromium oxide layer or chromium nitride layer formed in this way has extremely high hardness, and is impregnated into the ceramic sintered body to make it dense, making it possible to create a strong retainer. be able to. Note that the inner ring, outer ring, and rolling elements that are combined with this retainer to constitute the bearing device are preferably made of ceramic sintered bodies, but some of them may be made of gold clay.
さらに、酸化クロム層または窒化クロム層は導電性を有
するので、ベアリングを構成りる内輪、外輪および転動
子の一部または全部に同様の層を形成することにより、
ベアリング装置に尋電路を形成させることができる。Furthermore, since the chromium oxide layer or chromium nitride layer has conductivity, by forming a similar layer on some or all of the inner ring, outer ring, and rolling elements that make up the bearing,
It is possible to form an electrical path in the bearing device.
〔発明の実施例］ 次に本発明の実施例について説明する。[Embodiments of the invention] Next, examples of the present invention will be described.
実施例
シリカ還元法により（りた平均粒度約０．８μｍの窒化
ケイ素粉末（含有炭素１．７５ｉＱｆｉ％）に酸化イツ
トリウム、酸化アルミニウムおよび窒化アルミニウムを
、窒化ケイ素９１重ｆｉ％、酸化イツトリウム５重量％
、酸化アルミニウム２ｆｌｌｎｆｆｉ％、窒化アルミニ
ウム２重量％となるように添加し、充分に混合した後、
これに粘結剤としてパラフィンを約１０％加えて４００
ｋｇ ／ ｃｒｌの圧力で、所定のリテーナーの脚状に
金型成形し、これを窒素ガス中で１．５５０℃で約１時
間仮焼きした後、窒素ガス中で１．７５０°Ｃで約２時
間炉焼結を行なった。Example By the silica reduction method, yttrium oxide, aluminum oxide and aluminum nitride were added to silicon nitride powder (containing carbon 1.75iQfi%) with an average particle size of about 0.8 μm, silicon nitride 91% by weight, and yttrium oxide 5% by weight.
, aluminum oxide 2flnffi% and aluminum nitride 2% by weight, and after thorough mixing,
Add about 10% paraffin as a binder to this and make 400
It is molded into the leg shape of a specified retainer at a pressure of kg/crl, calcined in nitrogen gas at 1.550°C for about 1 hour, and then heated in nitrogen gas at 1.750°C for about 2 hours. Time furnace sintering was performed.
次にこの焼結体を、酸化亜鉛の添加されたクロム酸水溶
液スラリー中に２〜３分間浸）ｄした後、取り出して乾
燥接約７５０°Ｃで１０分間加熱することにより酸化ク
ロム層を形成させた。次いで窒素と水素の比が体積で
１＝１のフォーミングガス雰囲気中で１４５０℃で、６
０分間加熱して、表面に導電性窒化クロムを形成させた
。この導電性窒化クロム層の電気伝導度を測定したとこ
ろ１，２００Ω−’ａｒｌ’であった。Next, this sintered body is immersed in an aqueous chromic acid slurry containing zinc oxide for 2 to 3 minutes, taken out, and heated at approximately 750°C for 10 minutes to form a chromium oxide layer. I let it happen. Then the ratio of nitrogen to hydrogen in volume is
6 at 1450°C in a forming gas atmosphere of 1=1.
Heating was performed for 0 minutes to form conductive chromium nitride on the surface. The electrical conductivity of this conductive chromium nitride layer was measured and found to be 1,200 Ω-'arl'.
次にこのリテーナを、同一窒化ケイ素粉末混合物を用い
同一条件で製造した内輪、外輪および転動子を用いてベ
アリングを組立てた。Next, a bearing was assembled from this retainer using an inner ring, an outer ring, and a rolling element manufactured using the same silicon nitride powder mixture under the same conditions.
このベアリングは非常に耐摩耗性、礪械的強度にすぐれ
ており、長期にわたって全く故障を生じなかった。This bearing has excellent wear resistance and mechanical strength, and has not experienced any failures over a long period of time.
［光明の効果］
以上の実施例からも明らかなように本発明のベアリング
装置は、表面に非常に硬度の高い酸化クロムまたは窒化
クロムの含浸層が形成されているので、早期のＩ’６
！Ｌが防止される。また、レラミツク焼結体中に酸化ク
ロムまたは窒化クロムが含浸状態で一体化されてＪ３つ
、緻密、かつ強靭性をうず′るので破損し難く、さらに
それ自体導電性を有するので、例えば内、外輪および転
動子も同様の構成とすることにより導通され、セラミッ
クベアリングにお（プる給電接地等の問題が解消される
。[Effect of light] As is clear from the above examples, the bearing device of the present invention has a very hard chromium oxide or chromium nitride impregnated layer formed on the surface, so
! L is prevented. In addition, chromium oxide or chromium nitride is impregnated into the Reramiku sintered body, making it dense and tough, making it difficult to break. Furthermore, it is conductive itself, so for example, By having the outer ring and the rotors in the same configuration, conduction is achieved, and problems such as power supply and grounding caused by ceramic bearings are solved.
図面は一般のベアリング装置の構造を示す部分斜視図で
ある。
１・・・・・・・・・・・・内輪
２・・・・・・・・・・・・外輪
３・・・・・・・・・・・・転動子
４・・・・・・・・・・・・リテーナ−代理人弁理士
須 山 佐 −
とThe drawing is a partial perspective view showing the structure of a general bearing device. 1...Inner ring 2...Outer ring 3...Roller 4...・・・・・・Retainer - Representative Patent Attorney
Suyama Sa - and
Claims (4)
ムまたは窒化クロムの含浸層を有するセラミックス焼結
体からなることを特徴とするベアリング装置。(1) A bearing device characterized in that a retainer for holding a rolling element is made of a ceramic sintered body having a chromium oxide or chromium nitride impregnated layer on its surface.
いずれか、または全部がセラミックス焼結体からなる特
許請求の範囲第１項記載のベアリング装置。(2) The bearing device according to claim 1, in which any or all of the inner ring, outer ring, and rolling elements constituting the bearing are made of a ceramic sintered body.
いずれか、または全部が表面に酸化クロムまたは窒化ク
ロムの含浸層を有する特許請求の範囲第１項記載のベア
リング装置。(3) The bearing device according to claim 1, wherein any or all of the inner ring, outer ring, and rolling elements constituting the bearing have a chromium oxide or chromium nitride impregnated layer on the surface.
許請求の範囲第１項ないし第３項のいずれか１項記載の
金属被膜を有するベアリング装置。(4) A bearing device having a metal coating according to any one of claims 1 to 3, wherein the ceramic sintered body is made of silicon nitride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21212584A JPS6192322A (en) | 1984-10-10 | 1984-10-10 | Bearing unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21212584A JPS6192322A (en) | 1984-10-10 | 1984-10-10 | Bearing unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6192322A true JPS6192322A (en) | 1986-05-10 |
Family
ID=16617296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21212584A Pending JPS6192322A (en) | 1984-10-10 | 1984-10-10 | Bearing unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6192322A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6415523A (en) * | 1987-07-08 | 1989-01-19 | Hitachi Seiko Kk | Rolling bearing |
-
1984
- 1984-10-10 JP JP21212584A patent/JPS6192322A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6415523A (en) * | 1987-07-08 | 1989-01-19 | Hitachi Seiko Kk | Rolling bearing |
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