JPH0526237A - Touch down bearing of magnetic bearing device - Google Patents

Touch down bearing of magnetic bearing device

Info

Publication number
JPH0526237A
JPH0526237A JP3187419A JP18741991A JPH0526237A JP H0526237 A JPH0526237 A JP H0526237A JP 3187419 A JP3187419 A JP 3187419A JP 18741991 A JP18741991 A JP 18741991A JP H0526237 A JPH0526237 A JP H0526237A
Authority
JP
Japan
Prior art keywords
lead
ball
bearing
inner ring
cage
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
Application number
JP3187419A
Other languages
Japanese (ja)
Inventor
Takami Ozaki
孝美 尾崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Original Assignee
NTN Corp
NTN Toyo Bearing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Priority to JP3187419A priority Critical patent/JPH0526237A/en
Publication of JPH0526237A publication Critical patent/JPH0526237A/en
Pending legal-status Critical Current

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
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • F16C32/0442—Active magnetic bearings with devices affected by abnormal, undesired or non-standard conditions such as shock-load, power outage, start-up or touchdown
    • 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
    • F16C39/00—Relieving load on bearings
    • F16C39/02—Relieving load on bearings using mechanical means
    • 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
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/40—Application independent of particular apparatuses related to environment, i.e. operating conditions
    • F16C2300/62—Application independent of particular apparatuses related to environment, i.e. operating conditions low pressure, e.g. elements operating under vacuum conditions

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

PURPOSE:To improve the durability by making a ball holder of lead-included copper group metal, and forming lead film on the ball rolling surface of an inner ring or an outer ring opposite to a rotating member, and forming film of molybdenum disulfide on the surface which contacts to other members. CONSTITUTION:In a holder 9, an annular member 13 is made of copper group metal including lead such as lead bronze, and a pocket hole 14 for a ball 10 is formed by machining. Lead film 16 is formed on the ball rolling subrace 15 of an inner ring 7 opposite to a rotary shaft 2, and film 17 of molybdenum disulfide is formed on the surface of the inner ring 7 except for the ball rolling surface 15 by spattering. With this structure, the lead film 16 works as lubricant of the ball 10 at the initial stage of the rotation, and the lead converged to the ball 10 works to extract the lead included in the holder 9.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は、磁気軸受装置の制御
不能時に回転部材を支持するためのタッチダウン軸受に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touchdown bearing for supporting a rotating member when the magnetic bearing device cannot be controlled.

【０００２】[0002]

【従来の技術】従来の磁気軸受装置においては、図１に
示すように、磁気軸受１で非接触支持された回転軸２の
両端部にタッチダウン軸受３、４を配置し、突然の断線
や停電等によって磁気軸受１が制御不能になった場合
に、タッチダウン軸受３、４が回転軸２を支持して、磁
気軸受１や回転軸２の損傷を防ぐ構造がとられている。2. Description of the Related Art In a conventional magnetic bearing device, as shown in FIG. 1, touchdown bearings 3 and 4 are arranged at both ends of a rotary shaft 2 which is supported by a magnetic bearing 1 in a non-contact manner to prevent sudden disconnection or When the magnetic bearing 1 becomes uncontrollable due to a power failure or the like, the touchdown bearings 3 and 4 support the rotating shaft 2 to prevent damage to the magnetic bearing 1 and the rotating shaft 2.

【０００３】図２は、上記装置における下側のタッチダ
ウン軸受３の構造を示しており、この軸受３は、２個の
アンギュラ玉軸受５、６の正面組合せとして、ラジアル
荷重とアキシァル荷重の両方を受けるようにしている。
この各アンギュラ玉軸受５、６は、内輪７と外輪８の間
に、保持器９で保持される複数のボール１０を組込んで
形成され、各内輪７の組合せ面には研削加工によりすき
間１１が設けられ、内輪の熱膨張により軸受に予圧がか
からないようになっている。FIG. 2 shows the structure of the lower touchdown bearing 3 in the above apparatus. This bearing 3 is a frontal combination of two angular ball bearings 5 and 6 and has both a radial load and an axial load. I am trying to receive it.
Each of the angular ball bearings 5 and 6 is formed by incorporating a plurality of balls 10 held by a retainer 9 between an inner ring 7 and an outer ring 8. The combined surface of each inner ring 7 is provided with a gap 11 by grinding. Is provided so that the bearing is not preloaded by thermal expansion of the inner ring.

【０００４】上記構造のタッチダウン軸受３では、内輪
７が回転軸２に対向し、その内径面がタッチダウン面１
２となる。一方、図１において、ハウジング１３側を回
転させ、中央の軸に設けた磁気軸受によってハウジング
１３を支持するようにした構造では、タッチダウン軸受
の外輪８が回転部材であるハウジングに対向し、その外
径面でタッチダウンすることになる。In the touchdown bearing 3 having the above structure, the inner ring 7 faces the rotating shaft 2 and the inner diameter surface thereof is the touchdown surface 1.
It becomes 2. On the other hand, in FIG. 1, in the structure in which the housing 13 side is rotated and the housing 13 is supported by the magnetic bearing provided on the central shaft, the outer ring 8 of the touchdown bearing faces the housing that is the rotating member, and It will be touched down on the outer diameter surface.

【０００５】[0005]

【発明が解決しようとする課題】ところで、上記のタッ
チダウン軸受は、従来、緊急用として考えられていたた
め、１回又は２回のタッチダウンによって軸受が使用不
能になってもやむを得ないこととされていた。しかし、
使用不能となったタッチダウン軸受を交換するには、磁
気軸受装置を分解し、軸受を交換した後、内輪又は外輪
と回転部材との間のタッチダウンすき間を、磁気軸受の
軸受すき間に対して高精度に調整しつつ軸受装置を組立
てる作業が必要になるため、作業に著しく手間がかかる
不具合がある。このため、最近では、タッチダウン軸受
の耐久性を上げ、多数回のタッチダウンにも耐えること
ができる構造が求められている。By the way, since the above-mentioned touchdown bearing has been conventionally considered as an emergency use, it is unavoidable that the bearing becomes unusable after one or two touchdowns. Was there. But,
To replace a touchdown bearing that has become unusable, disassemble the magnetic bearing device, replace the bearing, and then adjust the touchdown clearance between the inner ring or outer ring and the rotating member to the bearing clearance of the magnetic bearing. Since it is necessary to assemble the bearing device while adjusting it with high accuracy, there is a problem that the work is extremely troublesome. For this reason, recently, there has been a demand for a structure that improves the durability of the touchdown bearing and can withstand a large number of touchdowns.

【０００６】しかしながら、従来のタッチダウン軸受
は、焼付きを生じないようなボールと保持器の材料の組
合せや、真空中での潤滑のために固体潤滑材でボール転
走面や摺動面を潤滑する構造はとられているが、最適な
耐久性を得るための材料や潤滑剤の組合せについては何
ら考慮されておらず、寿命向上を図る上での指針が全く
確立されていないのが実情である。However, the conventional touch-down bearing has a combination of ball and cage materials that will not cause seizure, and a solid lubricant for the ball rolling surface and sliding surface for lubrication in vacuum. Although a lubrication structure is adopted, no consideration is given to the combination of materials and lubricants to obtain optimum durability, and the guideline for improving the service life is not established at all. Is.

【０００７】そこで、この発明は、潤滑剤や保持器の材
料の最適な組合せの条件を与え、最長の寿命を実現でき
るタッチダウン軸受を提供しようとするものである。Therefore, the present invention is intended to provide a touchdown bearing which can provide the optimum combination of lubricants and cage materials to realize the longest life.

【０００８】[0008]

【課題を解決するための手段】上記の課題を解決するた
め、この発明は、内輪と外輪の間に、保持器で保持され
るボールを組込んだ磁気軸受装置のタッチダウン軸受に
おいて、上記保持器を鉛含有銅系金属で形成し、回転部
材と対向する内輪又は外輪におけるボール転走面に鉛の
被膜を、他部材との接触面に二硫化モリブデンの被膜を
それぞれ形成した構造としたものである。In order to solve the above-mentioned problems, the present invention provides a touch-down bearing of a magnetic bearing device in which balls held by a cage are incorporated between an inner ring and an outer ring. Made of lead-containing copper metal, with a lead coating on the ball rolling surface of the inner ring or outer ring facing the rotating member and a molybdenum disulfide coating on the contact surface with other members. Is.

【０００９】ここで、上記の鉛含有銅系金属は、鉛青銅
３種とするのが望ましい。Here, it is desirable that the above-mentioned lead-containing copper-based metal be lead bronze type 3.

【００１０】[0010]

【作用】上記の構造においては、内外輪とボールの回転
運動によって、ボール転走面の鉛被膜の鉛がボールの表
面に転位し、潤滑作用を行なう。また、内外輪とボール
の摩擦の繰返しにより転走面又はボール表面の鉛が不足
すると、保持器に含有された鉛が転走面やボール表面に
補充され、潤滑剤の枯渇を防止する。In the above structure, the lead of the lead coating on the ball rolling surface is dislocated to the surface of the ball by the rotational movement of the inner and outer races and the ball, and lubrication is performed. Further, when lead on the rolling surface or the ball surface becomes insufficient due to repeated friction between the inner and outer races and the ball, lead contained in the cage is replenished to the rolling surface and the ball surface to prevent depletion of the lubricant.

【００１１】一方、タッチダウンの際は、二硫化モリブ
デンの被膜が内輪又は外輪と他部材との接触面を潤滑
し、焼付きを防止すると共に、摩耗を抑制する。On the other hand, at the time of touchdown, the molybdenum disulfide coating lubricates the contact surface between the inner ring or the outer ring and other members, prevents seizure, and suppresses wear.

【００１２】[0012]

【実施例】この発明に係るタッチダウン軸受の基本構造
は、図２に示す従来のものと同じであり、内輪７と外輪
８の間に複数のボール１０が介在し、そのボール１０を
保持器９が保持している。The basic structure of a touchdown bearing according to the present invention is the same as the conventional structure shown in FIG. 2, in which a plurality of balls 10 are interposed between an inner ring 7 and an outer ring 8 and the balls 10 are retained by a cage. 9 holds.

【００１３】上記保持器９は、図３に示すように、鉛青
銅等の鉛を含有する銅系金属で形成した環状部材１３
に、ボール１０が嵌合するポケット孔１４を機械加工し
て形成されている。As shown in FIG. 3, the cage 9 has an annular member 13 made of a copper-based metal containing lead such as lead bronze.
Further, the pocket hole 14 into which the ball 10 is fitted is formed by machining.

【００１４】また、回転軸２に対向する内輪７のボール
転走面１５には、鉛の被膜１６が形成され、そのボール
転走面１５以外の内輪７の表面に、スパッタリングによ
り二硫化モリブデン（ＭｏＳ2 ）の被膜１７が形成され
ている。この場合、二硫化モリブデンの被膜１７の上に
は鉛が転移しにくいため、ボール転走面１５をマスキン
グした状態で内輪７の表面に二硫化モリブデンをスパッ
タリングし、その後、ボール転走面１５に鉛棒を押し付
けるなどして鉛をすり込み、鉛の被膜１６を形成する。A lead coating 16 is formed on the ball rolling surface 15 of the inner ring 7 which faces the rotating shaft 2, and molybdenum disulfide (molybdenum disulfide) is formed on the surface of the inner ring 7 other than the ball rolling surface 15 by sputtering. A coating film 17 of MoS 2 ) is formed. In this case, since lead is difficult to transfer onto the molybdenum disulfide coating 17, molybdenum disulfide is sputtered on the surface of the inner ring 7 with the ball rolling surface 15 masked, and then the ball rolling surface 15 is covered. Lead is rubbed in by pressing a lead rod to form a lead coating 16.

【００１５】このようにボール転走面１５に形成される
鉛の被膜１６は、回転初期におけるボール１０の潤滑剤
として作用し、ボール１０に転移した鉛は、保持器９に
含有されている鉛を引出す役目をする。The lead coating 16 thus formed on the ball rolling surface 15 acts as a lubricant for the ball 10 in the initial stage of rotation, and the lead transferred to the ball 10 is contained in the cage 9. Play a role in withdrawing.

【００１６】また、鉛青銅等などの鉛含有銅系金属は、
真空・高温の条件下において他の耐熱性高分子材料より
も放出ガス量が少ないため、高真空中で用いても真空度
に悪影響を及ぼさない。Further, the lead-containing copper-based metal such as lead bronze is
Since the amount of released gas is smaller than that of other heat-resistant polymer materials under the conditions of vacuum and high temperature, even when used in a high vacuum, the degree of vacuum is not adversely affected.

【００１７】上記のような鉛の被膜１６や、二硫化モリ
ブデンの被膜１７は、固定側の外輪８の表面に設けても
よいが、回転軸２と接触する内輪７の表面だけに設ける
だけでも十分な潤滑効果を得ることができる。The lead coating 16 and the molybdenum disulfide coating 17 as described above may be provided on the surface of the outer ring 8 on the fixed side, but may be provided only on the surface of the inner ring 7 that contacts the rotating shaft 2. A sufficient lubricating effect can be obtained.

【００１８】一方、内輪７及び外輪８は、ＳＵＪ２等の
軸受鋼又はＳＵＳ４４０Ｃ等のステンレス鋼で形成さ
れ、ボール１０は、焼入鋼又はセラミックス等で形成さ
れる。特に、ＳｉＮ等のセラミックス製のボールは、鉄
材との溶着が極めて少ないために、焼付きがなく、かつ
高い耐摩耗性を得ることができる。しかし、このような
材料に限定されるものではなく、耐摩耗性が高く焼付き
が生じにくい組合せであれば、他の任意の材料を選択す
ることができる。On the other hand, the inner ring 7 and the outer ring 8 are formed of bearing steel such as SUJ2 or stainless steel such as SUS440C, and the ball 10 is formed of hardened steel or ceramics. In particular, ceramic balls such as SiN do not have seizure and have high wear resistance because they are extremely little welded to the iron material. However, the material is not limited to such materials, and any other material can be selected as long as it is a combination having high wear resistance and hardly causing seizure.

【００１９】なお、図２のタッチダウン軸受は、アンギ
ュラ玉軸受５、６を正面組合せした構造を示したが、ラ
ジアル荷重だけを受ける構造の場合（図１に示す磁気軸
受装置における上側のタッチダウン軸受４）は、図４に
示すような単列の深みぞ玉軸受を用いることができる。
この場合の保持器９’は、図５に示すように、幅方向に
２つ割りされる環状部材１８ａ、１８ｂを、リベット１
９によって一体に固着して形成される。The touch-down bearing shown in FIG. 2 has a structure in which the angular ball bearings 5 and 6 are combined in front, but in the case of a structure that receives only radial load (the upper touch-down in the magnetic bearing device shown in FIG. 1). As the bearing 4), a single row deep groove ball bearing as shown in FIG. 4 can be used.
As shown in FIG. 5, the retainer 9 ′ in this case has annular members 18a and 18b, which are divided into two in the width direction, and the rivet 1
It is integrally fixed by 9 and formed.

【００２０】また、実施例では、回転軸２を内輪７にタ
ッチダウンさせる構造を示したが、内輪７を固定し、外
輪８を回転部材にタッチダウンさせる装置にも適用する
ことができる。この場合には、少なくとも外輪８のボー
ル転走面に鉛の被膜１６を形成し、それ以外の外輪８の
表面に、二硫化モリブデンの被膜１７を形成するように
する。Further, in the embodiment, the structure in which the rotating shaft 2 is touched down to the inner ring 7 has been shown, but the invention can be applied to a device in which the inner ring 7 is fixed and the outer ring 8 is touched down to the rotating member. In this case, at least the lead coating 16 is formed on the ball rolling surface of the outer ring 8 and the molybdenum disulfide coating 17 is formed on the other surface of the outer ring 8.

【００２１】−実験例− 本発明者は、耐久寿命の向上を引出す上で最適な保持器
の材料や、潤滑剤の種類、及びそれらの最良の組合せを
知るために各種の実験を行なった。次に、その実験例に
ついて述べる。-Experimental Example- The present inventor conducted various experiments in order to know the material of the cage, the kind of lubricant, and the best combination thereof, which are optimum for drawing out the improvement of the durable life. Next, an experimental example will be described.

【００２２】（実験例１）保持器は、ボールを回転自在
に案内し、かつ、ボール部材転走面に潤滑剤としての鉛
を補充する重要な役目を持ち、安定したトルク特性と、
補充に適した鉛含有構造とが求められる。(Experimental Example 1) The cage has an important role of rotatably guiding the balls and replenishing the ball member rolling surface with lead as a lubricant, and stable torque characteristics.
A lead-containing structure suitable for replenishment is required.

【００２３】そこで、実験例１では、上述した最適な特
性をもつ保持器の材料を知るため、保持器を、表１に示
すような含有成分を有する鉛青銅２種、３種、４種でそ
れぞれ形成し、それらを用いて回転試験を行ない、軸受
のトルク特性と各部品の重量変化を調べた。Therefore, in Experimental Example 1, in order to know the material of the cage having the above-mentioned optimum characteristics, the cage is made of lead bronze 2 types, 3 types and 4 types having the components shown in Table 1. Each was formed, and a rotation test was performed using them to examine the torque characteristics of the bearing and the weight change of each part.

【００２４】[0024]

【表１】 [Table 1]

【００２５】回転試験においては、上述した各種の保持
器を、予めボール転走面に鉛をすり込んだ玉軸受に装着
し、その玉軸受を、高真空・高温の状態下で配置された
回転軸に取付け、その回転軸を所定の総負荷回転数まで
回転させた場合の軸受の摩擦トルクの変化を測定した。
表２に、その回転試験の条件を示す。In the rotation test, the above-mentioned various cages were mounted on a ball bearing whose ball rolling surface was previously rubbed with lead, and the ball bearing was placed under a high vacuum / high temperature condition. And the change in the friction torque of the bearing was measured when the rotating shaft was rotated up to a predetermined total load rotation speed.
Table 2 shows the conditions of the rotation test.

【００２６】[0026]

【表２】 [Table 2]

【００２７】図６乃至図８は、トルク特性の試験結果を
示したものである。図６に示すように、保持器に鉛青銅
２種を用いた場合は、総負荷回転数に達するまでに急激
なトルク上昇を起こし、寿命に至った。これに対して、
図７及び図８に示すように、鉛青銅３種及び４種を用い
た場合は、総負荷回転数に達するまで安定したトルクを
示した。この場合、鉛青銅４種は、３種に比べて高いト
ルク値を示した。6 to 8 show the test results of the torque characteristic. As shown in FIG. 6, when two types of lead bronze were used for the cage, a rapid torque increase occurred until the total load rotation speed was reached, and the life was reached. On the contrary,
As shown in FIGS. 7 and 8, when the lead bronze type 3 and type 4 were used, stable torque was exhibited until the total load rotational speed was reached. In this case, the four types of lead bronze exhibited higher torque values than the three types.

【００２８】一方、表３は、上述した各種の試験用軸受
における試験後の各部品の重量変化を示したものであ
る。On the other hand, Table 3 shows the weight change of each component after the test in the above-mentioned various test bearings.

【００２９】[0029]

【表３】 [Table 3]

【００３０】この表に示すように、保持器に鉛青銅３種
を用いた場合は、各部品や保持器の重量変化が最も小さ
く、わずかの保持器の摩耗で効率的な潤滑がなされ、か
つその潤滑状態が長時間保持されたことが解る。また、
試験後のボール転走面は滑らかな面を示し、摩耗トルク
の少なさが裏付けられた。As shown in this table, when the lead bronze type 3 is used for the cage, the weight change of each component and the cage is the smallest, and the slight cage wear provides efficient lubrication. It can be seen that the lubrication state was maintained for a long time. Also,
The ball rolling surface after the test showed a smooth surface, which confirmed the low wear torque.

【００３１】これに対して、鉛青銅４種の場合は、保持
器の摩耗減量が大きく、物質の転着による鋼球の重量増
加も大きい値を示した。また、試験後のボール転走面の
表面には、鉛が多く残留しているのが見られ、その残留
した鉛が、鉛青銅３種に比べて高い摩擦トルク７を示す
原因になったと考えられる。On the other hand, in the case of the four types of lead bronze, the wear loss of the cage was large, and the weight increase of the steel balls due to the transfer of the substance was also large. In addition, a large amount of lead was found to remain on the surface of the ball rolling surface after the test, and it is considered that the residual lead caused a higher friction torque 7 than that of the lead bronze type 3. To be

【００３２】一方、鉛青銅２種の場合は、試験時間が他
の試験品に比べて短いにも拘わらず保持器の摩擦減量が
大きく、試験後のボール転走面は荒れた状態を示した。
これは、鉛青銅２種にボール転走面での鉛の不足を補う
だけの鉛含有量がなく、ボール転走面に予めすり込んだ
鉛の潤滑作用が無くなった時点で潤滑剤の枯渇が生じ、
これによって保持器の摩耗が急激に進行し、摩耗粉の噛
み込みにより寿命に至ったことが推察される。On the other hand, in the case of the two lead bronze types, although the test time was shorter than that of the other test products, the friction loss of the cage was large, and the ball rolling surface after the test showed a rough state. .
This is because the two types of lead bronze do not have a lead content sufficient to compensate for the lack of lead on the ball rolling surface, and the lubricant is depleted when the lubricating effect of the lead rubbed on the ball rolling surface is lost. ,
It is speculated that this causes the cage to wear rapidly and reach the end of its life due to the inclusion of wear particles.

【００３３】以上のことから、鉛青銅３種と４種には、
ボール転走面での潤滑剤不足を補充するのに十分な鉛含
有量があるが、ボールを保持するための強度やトルク特
性の上で鉛青銅３種が優れており、これにより、保持器
の材料として鉛青銅３種が最も適していることが示され
た。From the above, lead bronze type 3 and type 4 are
Although there is a sufficient lead content to supplement the lack of lubricant on the ball rolling surface, three types of lead bronze are superior in terms of strength and torque characteristics for holding the ball, which makes the cage It was shown that the three types of lead bronze are the most suitable as the material of.

【００３４】（実験例２）一方、真空中の摺動面に対し
て、蒸発圧の低い固定潤滑剤の被膜が良好な潤滑性を示
すことが知られている。このため、実験例２では、各種
の固体潤滑剤（二硫化モリブデン（ＭｏＳ2 ）、銀（Ａ
ｇ）、鉛（Ｐｂ））のうち、どれが最も良好な潤滑性能
を示すかを調べた。(Experimental Example 2) On the other hand, it is known that a coating film of a fixed lubricant having a low evaporation pressure exhibits good lubricity on a sliding surface in vacuum. Therefore, in Experimental Example 2, various solid lubricants (molybdenum disulfide (MoS 2 ), silver (A
It was investigated which of g) and lead (Pb)) had the best lubrication performance.

【００３５】試験は、転がり軸受の転走面に、上述した
各種の潤滑剤の被膜を形成し、その転がり軸受を、真空
中で１kgｆのスラスト荷重を加えた状態において、回転
数２５００ｒｐｍで回転試験し、軸受の摩擦トルクの変
化を測定した。図９は、試験結果を回転試験の初期、中
期、後期に分けて示したものである。The test was carried out by forming a coating of the above-mentioned various lubricants on the rolling surface of the rolling bearing, and rotating the rolling bearing at a rotation speed of 2500 rpm in a state where a thrust load of 1 kgf was applied in vacuum. Then, the change in the friction torque of the bearing was measured. FIG. 9 shows the test results divided into the initial, middle, and late stages of the rotation test.

【００３６】この図９に示すように、銀や鉛の場合、ト
ルクが次第に増大するのに比べて、二硫化モリブデンの
場合、トルク変化が極めて小さな範囲に収まっており、
二硫化モリブデンが真空中の摺動面に対して優れた潤滑
性能を発揮することが示された。As shown in FIG. 9, in the case of silver or lead, the torque gradually increases, whereas in the case of molybdenum disulfide, the torque change is within a very small range.
It has been shown that molybdenum disulfide exhibits excellent lubricating performance for sliding surfaces in vacuum.

【００３７】（実験例３）上記の実験例１及び２によ
り、保持器の材料として鉛青銅３種が、また摺動面の潤
滑剤として二硫化モリブデンが最も適するという結果が
得られたので、この実験例３では、それらと内外輪やボ
ールの材質との組合せにおいて、寿命向上に最適な条件
を求めた。(Experimental Example 3) From the above Experimental Examples 1 and 2, it was found that three types of lead bronze were most suitable as the material of the cage and molybdenum disulfide was most suitable as the lubricant of the sliding surface. In Experimental Example 3, the optimum conditions for improving the life were obtained by combining them with the materials of the inner and outer races and balls.

【００３８】図１０は、この実験に用いた試験装置の構
造を示している。この試験装置は、真空ポート（排気
口）２２を備えるハウジング２１の内部に、試験用軸受
２３とダミー用軸受２４を介して主軸２５を回転自在に
支持し、ハウジング２１内に、主軸２５を回転駆動する
誘導モータ２６を組込んでいる。また、ハウジング２１
の端部に、負荷調整ねじ２７と皿バネ２８を取付け、ね
じ２７の操作により試験用軸受２３に加えるアキシァル
方向の予圧と荷重を調整できるようにしている。FIG. 10 shows the structure of the test apparatus used in this experiment. This test apparatus rotatably supports a main shaft 25 inside a housing 21 having a vacuum port (exhaust port) 22 via a test bearing 23 and a dummy bearing 24, and rotates the main shaft 25 inside the housing 21. An induction motor 26 for driving is incorporated. In addition, the housing 21
A load adjusting screw 27 and a disc spring 28 are attached to the end of the, and the axial preload and the load applied to the test bearing 23 can be adjusted by operating the screw 27.

【００３９】試験用軸受２３は、単列の玉軸受を使用
し、アキシァル方向の荷重だけを受けるようにした。ま
た、試験用軸受の内輪には、赤外式幅射温度計を取付
け、ハウジング２１の前面に、その幅射温度計の温度読
取り用の測定窓２９を設けた。As the test bearing 23, a single row ball bearing was used, and only the axial load was applied. An infrared radiation thermometer was attached to the inner ring of the test bearing, and a measurement window 29 for reading the temperature of the radiation thermometer was provided on the front surface of the housing 21.

【００４０】試験は、先ず、負荷調整ねじ２７により試
験用軸受２３の予圧を調整し、ハウジング２１内部を真
空排気した後、主軸２５を定格回転させた。次に、負荷
調整ねじ２７の操作により試験用軸受２３に３００kgｆ
のアキシァル荷重をかけ、それと同時に一定の加速度で
主軸２５を減速させ、その時の誘導モータ２６の出力値
Ｋｗと、試験用軸受２３の内輪の温度変化を、試験用軸
受２３の完全停止まで測定した。この場合、主軸２５を
減速させる加速度は、−７０ｒｐｍ／ｍｉｎの一定加速
度とした。In the test, first, the preload of the test bearing 23 was adjusted by the load adjusting screw 27, the inside of the housing 21 was evacuated, and then the main shaft 25 was rotated at the rated speed. Next, by operating the load adjusting screw 27, 300 kgf is applied to the test bearing 23.
Axial load was applied, and at the same time, the spindle 25 was decelerated with a constant acceleration, and the output value Kw of the induction motor 26 and the temperature change of the inner ring of the test bearing 23 at that time were measured until the test bearing 23 was completely stopped. . In this case, the acceleration for decelerating the main shaft 25 was a constant acceleration of -70 rpm / min.

【００４１】表４は、この実験で用いた試験用軸受の組
合せ条件を示したものである。Table 4 shows the combination conditions of the test bearings used in this experiment.

【００４２】[0042]

【表４】 [Table 4]

【００４３】上記の表において、内輪と外輪は共にＳＵ
Ｊ２の焼入れ品を使用した。また、サンプルＮｏ．５
は、鉛青銅の保持器による潤滑剤の補充効果をみるため
に、保持器を使用せずにボールだけを内外輪間に組込ん
だ総ボール型の玉軸受を使用したものである。In the above table, both the inner ring and the outer ring are SU.
The hardened product of J2 was used. In addition, the sample No. 5
In order to check the effect of replenishing the lubricant by the lead bronze cage, a full ball type ball bearing in which only the balls are incorporated between the inner and outer rings is used without using the cage.

【００４４】図１１乃至図１５は、それぞれ表４のサン
プルＮｏ．１乃至Ｎｏ．５の試験結果を示している。11 to 15 show sample No. 4 in Table 4, respectively. 1 to No. The test result of 5 is shown.

【００４５】これらの試験結果をまとめると、次のよう
になる。The results of these tests are summarized as follows.

【００４６】（１）図１１及び図１３に示すように（サ
ンプルＮｏ．１及びサンプルＮｏ．３）、ボール転走面
の潤滑剤に二硫化モリブデン（ＭｏＳ2 ）を用いた場
合、タッチダウン直後に急激なトルク上昇となる例が多
く生じた。このことは、二硫化モリブデンの被膜はボー
ル転走面の潤滑に不向きであり、鉛青銅の保持器からの
潤滑剤補充が期待できないことを示している。(1) As shown in FIGS. 11 and 13 (Sample No. 1 and Sample No. 3), when molybdenum disulfide (MoS 2 ) was used as the lubricant on the ball rolling surface, immediately after touchdown. There were many cases where the torque suddenly increased. This indicates that the molybdenum disulfide coating is not suitable for lubrication of the ball rolling surface, and the replenishment of the lubricant from the lead bronze cage cannot be expected.

【００４７】（２）図１２及び図１４に示すように（サ
ンプルＮｏ．２及びサンプルＮｏ．４）、ボール転走面
の潤滑剤に鉛（Ｐｂ）を使用した場合は、良好なタッチ
ダウン特性が得られた。また、試験結果では、ボールの
材料にＳＵＪ２を使用した場合（サンプルＮｏ．２）、
タッチダウン途中でのトルク変動が大きく、ボール材料
にセラミックス（Ｓｉ3 Ｎ4 ）を使用した場合（サンプ
ルＮｏ．４）の方が安定したトルク特性を示した。(2) As shown in FIGS. 12 and 14 (Sample No. 2 and Sample No. 4), when lead (Pb) was used as the lubricant on the ball rolling surface, good touchdown characteristics were obtained. was gotten. In addition, in the test result, when SUJ2 is used as the material of the ball (Sample No. 2),
Torque fluctuation was large during the touchdown, and the case where ceramics (Si 3 N 4 ) was used as the ball material (Sample No. 4) showed more stable torque characteristics.

【００４８】（３）図１５に示すように（サンプルＮ
ｏ．５）、総ボール形式では、タッチダウン直後のトル
クは低いが、わずかな時間の経過後、急激なトルク上昇
に至った。これは、保持器からの潤滑剤の補充機能がな
いために、ボール転走面の潤滑不足が生じ、それがトル
ク上昇の原因になったと考えられる。(3) As shown in FIG.
o. 5) In the full-ball type, the torque immediately after touchdown was low, but after a short time, the torque rapidly increased. It is considered that this is because the lack of the function of replenishing the lubricant from the cage resulted in insufficient lubrication of the ball rolling surface, which caused an increase in torque.

【００４９】上記の試験結果から、ボール転走面の潤滑
剤には鉛が適し、保持器から鉛の補充によって安定した
トルク特性が得られることが解る。しかし、実験例２の
結果では、金属同士の摺動面に鉛より二硫化モリブデン
の方が良好な潤滑性能を示しており、内輪におけるタッ
チダウン面や保持器の案内面の潤滑は、二硫化モリブデ
ンの被膜の方が適していると考えられる。From the above test results, it is understood that lead is suitable for the lubricant on the ball rolling surface, and stable torque characteristics can be obtained by supplementing lead from the cage. However, the results of Experimental Example 2 show that molybdenum disulfide has a better lubricating performance than the lead on the sliding surfaces between metals, and the lubrication of the touchdown surface of the inner ring and the guide surface of the cage was A molybdenum coating appears to be more suitable.

【００５０】以上の実験例１、２、３の結果から、最適
な耐久寿命を実現することができる条件として、次の組
合せを挙げることができる。From the results of Experimental Examples 1, 2, and 3 described above, the following combinations can be mentioned as conditions under which the optimum durable life can be realized.

【００５１】 潤滑は、ボール転走面に鉛の被膜、他
部材と接触する軌道輪の表面に二硫化モリブデンの被
膜。Lubrication is performed by using a lead coating on the ball rolling surface and a molybdenum disulfide coating on the surface of the bearing ring that contacts other members.

【００５２】 保持器は鉛青銅３種。The cage is a lead bronze type 3.

【００５３】 ボールの材料はセラミックス（ＳｉＮ
系）。The ball material is ceramics (SiN
system).

【００５４】なお、上記の条件において、保持器の材料
は鉛青銅４種としても、長時間にわたって潤滑剤の安定
した補充を行なうことができる。Under the above conditions, even if the retainer is made of four types of lead bronze, the lubricant can be stably replenished for a long time.

【００５５】また、ボールの材料は、ＳＵＪ２として
も、若干トルクが高くなるものの十分に使用に耐えるこ
とができる。Further, as the ball material, SUJ2 has a slightly higher torque but can be sufficiently used.

【００５６】[0056]

【効果】以上のように、この発明は、従来確立されてい
なかったタッチダウン軸受に最適な耐久寿命を与える条
件を提供するものであり、多数回のタッチダウンにも耐
え得る耐久性を実現し、磁気軸受装置の性能の安定化と
作業能率の向上が図れる効果がある。[Effects] As described above, the present invention provides conditions that have not been established in the past to provide the touchdown bearing with optimum durability life, and realizes durability that can withstand multiple touchdowns. The effects of stabilizing the performance of the magnetic bearing device and improving work efficiency are achieved.

【図面の簡単な説明】[Brief description of drawings]

【図１】磁気軸受装置の構造図FIG. 1 is a structural diagram of a magnetic bearing device.

【図２】タッチダウン軸受を示す断面図FIG. 2 is a sectional view showing a touchdown bearing.

【図３】同上の保持器の一部を示す斜視図FIG. 3 is a perspective view showing a part of the above cage.

【図４】他のタッチダウン軸受を示す断面図FIG. 4 is a sectional view showing another touchdown bearing.

【図５】同上の保持器の一部を示す斜視図FIG. 5 is a perspective view showing a part of the above cage.

【図６】鉛青銅２種製保持器のトルク特性を示すグラフFIG. 6 is a graph showing torque characteristics of a cage made of lead bronze type 2

【図７】鉛青銅３種製保持器のトルク特性を示すグラフFIG. 7 is a graph showing torque characteristics of a cage made of lead bronze type 3

【図８】鉛青銅４種製保持器のトルク特性を示すグラフFIG. 8 is a graph showing torque characteristics of a cage made of lead bronze type 4

【図９】各種の固定潤滑剤のトルク特性を示すグラフFIG. 9 is a graph showing torque characteristics of various fixed lubricants.

【図１０】実験例３の試験装置の構造図FIG. 10 is a structural diagram of a test apparatus of Experimental Example 3

【図１１】実験例３におけるサンプルＮｏ．１のタッチ
ダウン特性を示すグラフ11 is a sample No. in Experimental Example 3; Graph showing touchdown characteristics of 1

【図１２】同上のサンプルＮｏ．２のタッチダウン特性
を示すグラフFIG. 12: Sample No. Graph showing touchdown characteristics of 2

【図１３】同上のサンプルＮｏ．３のタッチダウン特性
を示すグラフFIG. 13: Sample No. Graph showing touchdown characteristics of 3

【図１４】同上のサンプルＮｏ．４のタッチダウン特性
を示すグラフ14 is a sample No. same as the above. Graph showing touchdown characteristics of 4

【図１５】同上のサンプルＮｏ．５のタッチダウン特性
を示すグラフFIG. 15: Sample No. Graph showing touchdown characteristics of 5

【符号の説明】[Explanation of symbols]

１ 磁気軸受 ２ 回転軸 ３、４ タッチダウン軸受 ５、６ アンギュラ玉軸受 ７ 内輪 ８ 外輪 ９、９’ 保持器 １０ ボール １２ タッチダウン面 １５ ボール転走面 １６ 鉛の被膜 １７ 二硫化モリブデンの被膜 1 Magnetic bearing 2 rotation axes 3,4 touchdown bearing 5, 6 Angular contact ball bearing 7 inner ring 8 outer ring 9,9 'cage 10 balls 12 Touchdown surface 15 ball rolling surface 16 Lead coating 17 Molybdenum disulfide coating

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 磁気軸受で支持される回転部材に、内輪
又は外輪の一方が対向配置され、その内輪と外輪の間
に、保持器で保持されるボールを組込んだ磁気軸受装置
のタッチダウン軸受において、上記保持器を鉛含有銅系
金属で形成し、上記回転部材と対向する内輪又は外輪の
ボール転走面に鉛の被膜を、他部材との接触面に二硫化
モリブデンの被膜をそれぞれ形成したことを特徴とする
磁気軸受装置のタッチダウン軸受。1. A touchdown of a magnetic bearing device in which one of an inner ring and an outer ring is arranged to face a rotating member supported by a magnetic bearing, and a ball held by a cage is incorporated between the inner ring and the outer ring. In the bearing, the cage is made of lead-containing copper-based metal, and a lead coating is formed on the ball rolling surface of the inner ring or the outer ring facing the rotating member, and a molybdenum disulfide coating is formed on the contact surface with another member. A touchdown bearing for a magnetic bearing device, which is characterized by being formed. 【請求項２】 上記鉛含有銅系金属を鉛青銅３種とした
請求項１に記載の磁気軸受装置のタッチダウン軸受。2. The touchdown bearing for a magnetic bearing device according to claim 1, wherein the lead-containing copper-based metal is lead bronze type 3.
JP3187419A 1991-07-26 1991-07-26 Touch down bearing of magnetic bearing device Pending JPH0526237A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3187419A JPH0526237A (en) 1991-07-26 1991-07-26 Touch down bearing of magnetic bearing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3187419A JPH0526237A (en) 1991-07-26 1991-07-26 Touch down bearing of magnetic bearing device

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP11007687A Division JPH11257353A (en) 1999-01-14 1999-01-14 Touch-down bearing for magnetic bearing device

Publications (1)

Publication Number Publication Date
JPH0526237A true JPH0526237A (en) 1993-02-02

Family

ID=16205718

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3187419A Pending JPH0526237A (en) 1991-07-26 1991-07-26 Touch down bearing of magnetic bearing device

Country Status (1)

Country Link
JP (1) JPH0526237A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG93933A1 (en) * 2001-03-28 2003-01-21 Mitsubishi Materials Corp Copper-based sintered alloy bearing and motor fuel pump
US6617733B1 (en) * 1999-03-31 2003-09-09 Seiko Instruments Inc. Magnetic bearing apparatus and vacuum pump having magnetic bearing apparatus
US7786637B2 (en) * 2004-12-01 2010-08-31 Jtekt Corporation Touchdown bearing

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6617733B1 (en) * 1999-03-31 2003-09-09 Seiko Instruments Inc. Magnetic bearing apparatus and vacuum pump having magnetic bearing apparatus
SG93933A1 (en) * 2001-03-28 2003-01-21 Mitsubishi Materials Corp Copper-based sintered alloy bearing and motor fuel pump
US6663344B2 (en) 2001-03-28 2003-12-16 Mitsubishi Materials Corporation Copper-based sintered alloy bearing and motor fuel pump
US7786637B2 (en) * 2004-12-01 2010-08-31 Jtekt Corporation Touchdown bearing

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