JPH0712129A - Electrolytic corrosion preventing type rolling bearing - Google Patents
Electrolytic corrosion preventing type rolling bearingInfo
- Publication number
- JPH0712129A JPH0712129A JP5158840A JP15884093A JPH0712129A JP H0712129 A JPH0712129 A JP H0712129A JP 5158840 A JP5158840 A JP 5158840A JP 15884093 A JP15884093 A JP 15884093A JP H0712129 A JPH0712129 A JP H0712129A
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- rolling element
- electrolytic corrosion
- rolling
- built
- 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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/303—Parts of ball or roller bearings of hybrid bearings, e.g. rolling bearings with steel races and ceramic rolling elements
-
- 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
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/24—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly
- F16C19/26—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with a single row of rollers
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、内部にグリースが封入
される形態の電蝕防止型の転がり軸受に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic corrosion-prevention type rolling bearing in which grease is enclosed.
【０００２】[0002]
【従来の技術】例えば、鉄道車両の電動機に用いる軸受
には、電動機から軸受鋼製軸受内部へ電流が流れること
があり、軸受内部を通る電流によって軸受の転動体と内
・外輪との接触部位に電蝕が生じ、寿命が短くなる。そ
こで、この種の軸受については、従来から、内・外輪の
外表面に絶縁性の被膜を形成することにより、電蝕の発
生を防止することが行われている。2. Description of the Related Art For example, in a bearing used for an electric motor of a railway vehicle, an electric current may flow from the electric motor to the inside of a bearing steel bearing, and the contact portion between the rolling element of the bearing and the inner / outer ring is caused by the electric current passing through the inside of the bearing. Electrolytic corrosion occurs and shortens the service life. Therefore, in this type of bearing, it has been conventionally practiced to prevent the occurrence of electrolytic corrosion by forming an insulating coating on the outer surfaces of the inner and outer races.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上記従来例
において、被膜が合成樹脂の場合だと、荷重作用時に弾
性変形して軸受そのものの軸心が変動しやすくなった
り、あるいは経時的な収縮によってクリープを招いたり
することが指摘され、また、被膜をセラミックスなどの
硬質なものにした場合だと、必要箇所への組み込み時に
セラミックス被膜が欠けるなど部分的に剥離することが
あり、本来の目的である絶縁機能を発揮できなくなるこ
とが指摘される。By the way, in the above-mentioned conventional example, when the coating is made of synthetic resin, the shaft center of the bearing itself tends to fluctuate due to elastic deformation when a load is applied, or due to shrinkage over time. It has been pointed out that this may lead to creep, and if the coating is made of a hard material such as ceramics, the ceramic coating may be partially peeled off when it is installed in the required place, and for the original purpose. It is pointed out that a certain insulating function cannot be exerted.
【０００４】さらには、これら絶縁被膜をもってしても
軸受部の絶縁性は絶対的ではなく、すなわち転動体と軌
道輪あるいは保持器との間で発生する鉄粉、銅粉などの
摩耗粉がグリース中に飛散したり、外部から侵入した水
分などがグリース中に混入したりして、これら摩耗粉や
水分が電荷の媒体となり近接するハウジングと外輪との
間の絶縁性を破壊したりすることがある。Furthermore, even if these insulating coatings are used, the insulating property of the bearing is not absolute, that is, abrasion powder such as iron powder and copper powder generated between the rolling element and the bearing ring or the cage causes grease. It may scatter inside, or water that has entered from the outside may mix into the grease, and these abrasion powder and water can act as a charge medium and destroy the insulation between the housing and the outer ring that are in close proximity. is there.
【０００５】本発明は、このような事情に鑑み、絶縁機
能に優れているとともに、従来のような組み込み時や組
み込んだ状態においての不具合がない構造とすることを
課題としている。In view of such circumstances, it is an object of the present invention to provide a structure which is excellent in an insulating function and which does not have a problem in the conventional assembling or assembled state.
【０００６】[0006]
【課題を解決するための手段】本発明は、内部にグリー
スが封入される形態の電蝕防止型の転がり軸受におい
て、少なくとも内・外輪間に介装される転動体が、窒化
けい素を主体として加圧焼結により形成され、かつ少な
くともその転動面の粗さが０．２Ｚ以下とされている構
成とした。SUMMARY OF THE INVENTION According to the present invention, in an electrolytic corrosion preventing type rolling bearing in which grease is enclosed, at least the rolling element interposed between the inner and outer rings is mainly made of silicon nitride. Is formed by pressure sintering, and at least the rolling surface has a roughness of 0.2Z or less.
【０００７】[0007]
【作用】保持器を含め内・外輪間の広い空間が絶縁素材
からなる転動体により電気的に絶縁されるので、軸受内
部で電蝕が発生しなくなる。The wide space between the inner and outer rings, including the cage, is electrically insulated by the rolling elements made of an insulating material, so that electrolytic corrosion does not occur inside the bearing.
【０００８】そして、内・外輪の外表面に被膜を形成す
るようにはせずに既存の軸受構成要素を絶縁素材として
いるから、従来のような軸受の組み込み時や組み込んだ
状態においての不具合が生じない。しかも、転動体を窒
化けい素を主体として加圧焼結で形成しているから、結
晶結合が強力で強度的に優れている他、気泡やクラック
の発生率がきわめて少なくなって水分などが吸収されに
くくなる。また、表面粗さを小さく特定することにより
金属摩耗粉や水分を付着させにくくしているから、金属
摩耗粉や水分を媒体とする電流通過も起きなくて済む。
また、金属摩耗粉そのものの絶対量が減るので、それに
よる絶縁破壊の可能性も少なくなる。Since the existing bearing components are made of an insulating material without forming a coating on the outer surfaces of the inner and outer races, there is a problem in the conventional assembling or mounting state of the bearing. Does not happen. Moreover, since the rolling elements are formed by pressure sintering with silicon nitride as the main constituent, the crystal bond is strong and the strength is excellent, and the occurrence rate of bubbles and cracks is extremely low and moisture is absorbed. It becomes difficult to be played. Further, by specifying the surface roughness to be small, it is possible to prevent the metal abrasion powder and the water from adhering to each other, so that the electric current passing through the metal abrasion powder and the water does not occur.
Moreover, since the absolute amount of the metal abrasion powder itself is reduced, the possibility of dielectric breakdown due to it is reduced.
【０００９】また、転動体は金属製のものに比べて比重
が小さくなるので、転動体の慣性力低減に効果があり、
保持器に対する負担を軽減できるようになる。Further, since the rolling element has a smaller specific gravity than that made of metal, it is effective in reducing the inertial force of the rolling element.
The load on the cage can be reduced.
【００１０】[0010]
【実施例】本発明の詳細を図１および図２に示す一実施
例により説明する。図中、１は内輪、２は外輪、３は円
筒ころよりなる転動体、４は保持器である。そして、図
示しないが、この軸受の内部にはグリースがシール装置
などにより封入される。DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described with reference to an embodiment shown in FIGS. In the figure, 1 is an inner ring, 2 is an outer ring, 3 is a rolling element made of cylindrical rollers, and 4 is a cage. Although not shown, grease is sealed in the bearing by a sealing device or the like.
【００１１】内・外輪１，２は軸受鋼などの金属製とさ
れており、転動体３は窒化けい素を主体として加圧焼結
により形成されるセラミックス製とされ、内・外輪間の
導通経路となりうるその転動面の粗さは０．２Ｚ以下と
されている。この加圧焼結としては、例えばＨＩＰ（ホ
ット・アイソスタティック・プレス）と称する手法が採
用される。The inner and outer rings 1 and 2 are made of metal such as bearing steel, and the rolling element 3 is made of ceramics which is mainly formed of silicon nitride by pressure sintering. The roughness of the rolling surface that can serve as a path is set to 0.2Z or less. As the pressure sintering, for example, a method called HIP (Hot Isostatic Press) is adopted.
【００１２】保持器４は、軸方向に２分割とされてい
て、転動体３を回転自在に保持する複数のポケット５の
間の部分がリベット６によって結合された構造であり、
銅合金などの金属で形成されている。この保持器４は、
いわゆる転動体案内となるように設計されていて、内・
外輪１，２のいずれに対しても径方向で比較的大きな隙
間が存在するから、外輪案内形式や内輪案内形式のもの
に比べて内・外輪１，２と保持器４との間の対向隙間へ
グリースなどの潤滑剤を偏らない状態で入れやすくな
る。外輪案内形式や内輪案内形式のものに比べて内・外
輪との接触による摩耗粉の発生も少ない。The cage 4 is divided into two parts in the axial direction and has a structure in which a part between a plurality of pockets 5 for rotatably holding the rolling element 3 is connected by a rivet 6.
It is made of metal such as copper alloy. This cage 4
It is designed to be a so-called rolling element guide,
Since there is a relatively large radial gap with respect to both the outer rings 1 and 2, the facing gap between the inner / outer rings 1 and 2 and the cage 4 is larger than that of the outer ring guide type or the inner ring guide type. It becomes easier to add grease and other lubricants without bias. Compared to the outer ring guide type and inner ring guide type, less abrasion powder is generated due to contact with the inner and outer rings.
【００１３】このように内・外輪１，２間を絶縁素材か
らなる転動体３により電気的に絶縁させているから、軸
受内部で電蝕が発生しなくなる。Since the rolling elements 3 made of an insulating material electrically insulate the inner and outer rings 1 and 2 from each other in this manner, electrolytic corrosion does not occur inside the bearing.
【００１４】この他、転動体３のセラミックス化によ
り、金属製とする場合に比べて比重が約７．８から約
３．２へと大幅に小さくなるから、回転遠心力による慣
性力を小さくでき、保持器４のポケット５の内壁に対す
る転動体３の衝撃負担を軽減できるようになる。これ
は、下記する軸受回転振動試験により確認できている。
この軸受回転振動試験は、図２に示すような装置を用い
て行う。図２において、Ａは試験軸受、７はハウジン
グ、８は片持ち支持される回転軸、９は支持軸受、１０
〜１２は予圧調整用の間座や台座、１３は予圧調整用の
ナットである。そして、試験条件は、振動加速度：５０
Ｇ、振動周波数：６０Ｈｚ（正弦波）、振幅：３．４５
ｍｍ、回転数：１０００ｒｐｍ、荷重：軸自重のみ
（２．０Ｋｇｆ）、潤滑：日本石油製の商品名マルチノ
ックＮＯ．２、振動回数：リベット切損またはゆるみま
で、とそれぞれ設定されている。また、試験軸受Ａは、
前述した構造の本実施例品と、比較品として構成要素の
全てが軸受鋼（ＳＵＪ２）からなるもの（ＪＩＳ型番Ｎ
Ｕ２１９ＦＹ）とした。結果として、比較品では振動７
５０万回で保持器のリベットが破損したのに対し、本実
施例品では振動２３００万回で保持器のリベットゆるみ
が見られた程度で済むなど、明らかに本実施例品のほう
が優れた特性を示している。このように、転動体３のセ
ラミックス化により副次的に保持器４を転動体案内形式
にできるようになるとともに、リベット止めする二分割
構造のものを使用できるようになるなど、コスト面で有
利となる。さらには、転動体の慣性力が小さいことか
ら、転動体案内であっても転動体との間の接触摩耗は軽
減され、摩耗粉の発生は少なくなり絶縁破壊のおそれは
少なくなる。In addition, since the rolling elements 3 are made of ceramics, the specific gravity is greatly reduced from about 7.8 to about 3.2 as compared with the case where the rolling elements 3 are made of metal. The impact load of the rolling element 3 on the inner wall of the pocket 5 of the cage 4 can be reduced. This can be confirmed by the bearing rotation vibration test described below.
This bearing rotational vibration test is performed using an apparatus as shown in FIG. In FIG. 2, A is a test bearing, 7 is a housing, 8 is a cantilevered rotary shaft, 9 is a support bearing, and 10 is a bearing.
Numeral 12 is a pedestal or pedestal for preload adjustment, and 13 is a nut for preload adjustment. And the test condition is vibration acceleration: 50
G, vibration frequency: 60 Hz (sine wave), amplitude: 3.45
mm, rotation speed: 1000 rpm, load: shaft own weight only (2.0 Kgf), lubrication: Nippon Oil Co., Ltd., trade name Multi Knock NO. 2. Vibration frequency: Rivet breakage or looseness is set respectively. The test bearing A is
The product of this embodiment having the above-described structure and the product of comparison which has all the constituent elements made of bearing steel (SUJ2) (JIS model number N
U219 FY). As a result, the comparison product vibrates 7
The rivet of the cage was broken after 500,000 cycles, whereas the rivet of the cage was loosened after vibration of 23 million cycles in the product of this example. Is shown. As described above, by making the rolling elements 3 ceramic, the cage 4 can be secondarily formed into a rolling element guide type, and a two-part structure with riveting can be used, which is advantageous in terms of cost. Becomes Further, since the rolling element has a small inertial force, contact wear between the rolling element and the rolling element is reduced even in the rolling element guide, the generation of abrasion powder is reduced, and the risk of dielectric breakdown is reduced.
【００１５】なお、上記実施例では、内外軌道輪１，２
を軸受鋼製としているが、少なくとも導通経路の上流側
である外輪２、さらには加えて内輪１も転動体３と同
様、窒化けい素を主体とするセラミックスで形成しても
よい。また、工作機械などの主軸用軸受の電蝕防止を行
うためには、上記実施例のように転動体３に加えて、導
通経路の上流側となる内輪１を窒化けい素を主体とする
セラミックスで形成してもよい。さらにまた、転動体３
の転動面の粗さのみを０．２Ｚ以下と規定しているが、
水分や摩耗粉の付着を完全に防止するという点から転動
体３の軸方向端面もその粗さを０．２Ｚ以下としてもよ
い。転動体３としては図示したころの他、玉であっても
よい。さらに、保持器なしの総ころ軸受あるいは総玉軸
受であってもよい。In the above embodiment, the inner and outer bearing rings 1, 2 are
Is made of bearing steel, but at least the outer ring 2 on the upstream side of the conduction path, as well as the inner ring 1, may be formed of ceramics mainly composed of silicon nitride, like the rolling elements 3. Further, in order to prevent electrolytic corrosion of a main shaft bearing of a machine tool or the like, in addition to the rolling element 3 as in the above embodiment, the inner ring 1 on the upstream side of the conduction path is made of a ceramic mainly composed of silicon nitride. You may form with. Furthermore, rolling element 3
Although only the roughness of the rolling surface of is specified as 0.2Z or less,
The roughness of the axial end surface of the rolling element 3 may be 0.2Z or less from the viewpoint of completely preventing the adhesion of water and abrasion powder. The rolling elements 3 may be balls instead of the illustrated ones. Further, it may be a full roller bearing or a full ball bearing without a cage.
【００１６】[0016]
【発明の効果】本発明では、既存の軸受構成要素である
転動体を特定のセラミックスとすることにより内・外輪
間の電気絶縁を行うようにしているから、電気絶縁のた
めの余分な部品や加工が不要であるなど無駄がない他、
従来のような軸受の組み込み時や組み込んだ状態におい
ての不具合がなく、電気絶縁の信頼性が高い。また、こ
の転動体の製法や表面粗さを特定することにより水分吸
収する可能性のある気泡やクラックの発生を抑えるとと
もに表面への水分付着を阻止し、また、金属摩耗粉の付
着をも阻止できるようにしているから、水分や金属摩耗
粉などのような不確定要素による電気導通の発生も確実
に阻止できる点でも電気絶縁の信頼性が高くなってい
る。According to the present invention, the rolling element, which is an existing bearing component, is made of a specific ceramic to electrically insulate between the inner and outer rings. There is no waste such as processing is unnecessary,
There is no problem when the bearing is assembled or in the assembled state as in the past, and the electrical insulation is highly reliable. In addition, by specifying the manufacturing method and surface roughness of this rolling element, we suppress the occurrence of bubbles and cracks that may absorb water, and prevent the adhesion of water to the surface, and also the adhesion of metal abrasion powder. Therefore, the reliability of the electrical insulation is high in that the electrical conduction due to uncertain factors such as moisture and metal abrasion powder can be surely prevented.
【図１】本発明の電蝕型の転がり軸受の一実施例の上半
分の縦断面図。FIG. 1 is a vertical sectional view of an upper half of an embodiment of an electrolytic corrosion type rolling bearing of the present invention.
【図２】本実施例での軸受回転振動試験装置の概略構成
を示す上半分断面の側面図。FIG. 2 is a side view of an upper half section showing a schematic configuration of a bearing rotational vibration test device according to the present embodiment.
１ 内輪 ２ 外輪 ３ 転動体 ４ 保持器 1 Inner ring 2 Outer ring 3 Rolling element 4 Cage
フロントページの続き (72)発明者 三好 通 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Front page continuation (72) Inventor Miyoshi 3-5-8 Minamisenba, Chuo-ku, Osaka City Koyo Seiko Co., Ltd.
Claims (1)
防止型の転がり軸受であって、 少なくとも内・外輪間に介装される転動体が、窒化けい
素を主体として加圧焼結により形成され、かつ少なくと
もその転動面の粗さが０．２Ｚ以下とされている、こと
を特徴とする電蝕防止型の転がり軸受。1. A rolling bearing of an electrolytic corrosion prevention type in which grease is sealed inside, wherein at least the rolling element interposed between the inner and outer rings is mainly made of silicon nitride by pressure sintering. An electrolytic corrosion-preventing rolling bearing, which is formed and has a roughness of at least its rolling surface of 0.2Z or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5158840A JP2934697B2 (en) | 1993-06-29 | 1993-06-29 | Anti-corrosion rolling bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5158840A JP2934697B2 (en) | 1993-06-29 | 1993-06-29 | Anti-corrosion rolling bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0712129A true JPH0712129A (en) | 1995-01-17 |
| JP2934697B2 JP2934697B2 (en) | 1999-08-16 |
Family
ID=15680558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5158840A Expired - Fee Related JP2934697B2 (en) | 1993-06-29 | 1993-06-29 | Anti-corrosion rolling bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2934697B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006112568A (en) * | 2004-10-15 | 2006-04-27 | Nsk Ltd | Cylindrical roller bearing |
| JP2012060772A (en) * | 2010-09-08 | 2012-03-22 | Mitsubishi Electric Corp | Rotor of motor, motor, air handling unit, and manufacturing method of rotor of motor |
| JP2012067813A (en) * | 2010-09-22 | 2012-04-05 | Nsk Ltd | Spindle device |
| WO2013099586A1 (en) * | 2011-12-29 | 2013-07-04 | Ntn株式会社 | Bearing for main motor, supporting structure for main shaft of main motor, and main motor for railway vehicle |
| JP2013139842A (en) * | 2011-12-29 | 2013-07-18 | Ntn Corp | Main motor bearing |
| JP2013141405A (en) * | 2013-04-04 | 2013-07-18 | Mitsubishi Electric Corp | Electric motor and air conditioner |
| JP2013139841A (en) * | 2011-12-29 | 2013-07-18 | Ntn Corp | Supporting structure for main motor spindle, and main motor for railway vehicle |
-
1993
- 1993-06-29 JP JP5158840A patent/JP2934697B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006112568A (en) * | 2004-10-15 | 2006-04-27 | Nsk Ltd | Cylindrical roller bearing |
| JP2012060772A (en) * | 2010-09-08 | 2012-03-22 | Mitsubishi Electric Corp | Rotor of motor, motor, air handling unit, and manufacturing method of rotor of motor |
| JP2012067813A (en) * | 2010-09-22 | 2012-04-05 | Nsk Ltd | Spindle device |
| WO2013099586A1 (en) * | 2011-12-29 | 2013-07-04 | Ntn株式会社 | Bearing for main motor, supporting structure for main shaft of main motor, and main motor for railway vehicle |
| JP2013139842A (en) * | 2011-12-29 | 2013-07-18 | Ntn Corp | Main motor bearing |
| JP2013139841A (en) * | 2011-12-29 | 2013-07-18 | Ntn Corp | Supporting structure for main motor spindle, and main motor for railway vehicle |
| JP2013141405A (en) * | 2013-04-04 | 2013-07-18 | Mitsubishi Electric Corp | Electric motor and air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2934697B2 (en) | 1999-08-16 |
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