JP2931868B2 - Roller bearing cage - Google Patents
Roller bearing cageInfo
- Publication number
- JP2931868B2 JP2931868B2 JP2179828A JP17982890A JP2931868B2 JP 2931868 B2 JP2931868 B2 JP 2931868B2 JP 2179828 A JP2179828 A JP 2179828A JP 17982890 A JP17982890 A JP 17982890A JP 2931868 B2 JP2931868 B2 JP 2931868B2
- Authority
- JP
- Japan
- Prior art keywords
- cage
- friction
- weight
- bearing
- mos
- 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.)
- Expired - Lifetime
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Landscapes
- Rolling Contact Bearings (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は真空中、高温、低温、放射線下など潤滑油や
グリースが使用できない環境下で使用するころがり軸受
用保持器に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a roller bearing retainer used in an environment where lubricating oil or grease cannot be used, such as in a vacuum, at a high temperature, at a low temperature, or under radiation.
従来、潤滑油やグリースが使用できない環境下で運転
する各種機器のころがり軸受の潤滑には次の3つの方法
がある。BACKGROUND ART Conventionally, there are the following three methods for lubricating rolling bearings of various devices operating in an environment where lubricating oil and grease cannot be used.
(1)内輪、外輪、保持器及び転動体の全部または一部
の摺動面にスパッタリングなどで二硫化モリブデン(Mo
S2)、二硫化タングステン(WS2)や銀(Ag)などの薄
い潤滑膜を形成する方法で、その代表例としては特開昭
55−57717、特開昭58−113629および特開昭61−55410が
ある。(1) Molybdenum disulfide (Mo) is applied to all or some of the sliding surfaces of the inner ring, outer ring, cage and rolling elements by sputtering or the like.
S 2), in a way to form a thin lubricant film, such as tungsten disulfide (WS 2) and silver (Ag), JP typical examples thereof include
55-57717, JP-A-58-113629 and JP-A-61-55410.
(2)MoS2,WS2等の固体潤滑剤を金属または合金に添加
した焼結合金から成る保持器を使用し、転動体と保持器
との摩擦によって保持器材料を転動体および転動体を介
して内輪、外輪に移着させて薄い潤滑膜を形成する方法
で、その代表例は特開昭62−151539や特開昭63−246507
に示されている。(2) A cage made of a sintered alloy obtained by adding a solid lubricant such as MoS 2 or WS 2 to a metal or an alloy is used, and the material of the cage is replaced by the rolling element and the rolling element by friction between the rolling element and the cage. A method of forming a thin lubricating film by transferring to an inner ring and an outer ring through an intermediate ring, typical examples of which are disclosed in JP-A-62-151539 and JP-A-63-246507.
Is shown in
(3)プラスチックもしくはプラスチックに固体潤滑剤
を添加した高分子系複合材料を用いて保持器を形成し、
転動体と保持器との摩擦によって、保持器材料を転動体
および転動体を介して内輪、外輪に移着させて薄い潤滑
膜を形成する方法で、その代表例としてはふっ素樹脂系
のルーロンE(NTN・ルーロン社の商品名)やDuroid
(米国 Barden社の商品名)などで形成した保持器があ
る。このような保持器はポリテトラフルオロエチレン樹
脂(以下PTFEと略す)にガラス繊維とMoS2を添加して形
成している。(3) A cage is formed using plastic or a polymer-based composite material obtained by adding a solid lubricant to plastic,
A method in which a cage material is transferred to an inner ring and an outer ring via a rolling element and a rolling element by friction between a rolling element and a cage to form a thin lubricating film. A typical example is a fluororesin-based Lulon E (Product name of NTN / Lulong) or Duroid
(Trade name of Barden, USA). Such a cage is formed by adding glass fiber and MoS 2 to a polytetrafluoroethylene resin (hereinafter abbreviated as PTFE).
しかるに前記(1)のように予め薄い潤滑膜を形成さ
せておく方法では、摩擦によって膜が摩耗すれば潤滑効
果が消失し、基材の金属が露出して焼きつきを生じるた
め、一般に短寿命である。However, in the method of forming a thin lubricating film in advance as in the above (1), if the film is worn by friction, the lubricating effect is lost, and the metal of the base material is exposed and seizure occurs. It is.
(2)のように焼結金属を用いた保持器では、機械加
工性が悪く、摩擦音が大きいとともに、脆い欠点があ
り、使用時に割れたり、大気中での摩耗が極めて大きい
という問題がある。The cage using a sintered metal as in (2) has poor machinability, has a large frictional noise, has a brittle defect, and has a problem that it breaks during use and wear in the atmosphere is extremely large.
また、高分子系複合材料を用いた(3)の方法では、
PTFEをガラス繊維で補強すると表面に突出してきたガラ
ス繊維によって、保持器から移着した潤滑材が削り落と
されたり、転動体表面が荒らされたりするため、摩耗を
早めるとともに発熱を起こして、使用時にトルク変動を
起こし易いという欠点があった。In the method (3) using the polymer composite material,
When PTFE is reinforced with glass fiber, the lubricating material transferred from the cage is shaved off or the rolling element surface is roughened by the glass fiber that has protruded to the surface. There was a drawback that torque fluctuations were easily caused at times.
この対策として、例えば特開昭62−261718に提案され
ているように、保持器の加工表面部のガラス繊維をふっ
化水素酸により溶解除去する方法がとられているが、ふ
っ化水素酸は毒性があるので取り扱いに特別な注意が必
要であり、このような処理を行ってもPTFEの摩耗が進行
すると、いずれ表面にガラス繊維が現れて対策前と同
様、潤滑に悪影響を及ぼす。As a countermeasure, for example, as proposed in Japanese Patent Application Laid-Open No. 62-261718, a method of dissolving and removing glass fibers on the processing surface portion of the retainer with hydrofluoric acid has been adopted. Due to its toxicity, special care must be taken during handling. Even if such treatment is performed, if the abrasion of the PTFE progresses, glass fibers will eventually appear on the surface, which will adversely affect lubrication as before.
PTFE以外の高分子系の複合材料として、熱的に安定し
た特性をもつポリイミドを用いた保持器では、真空中で
放出ガス量が多いという欠点がある。また、特公昭63−
1989のように熱可塑性ポリエーテル芳香族ケトンとフッ
素樹脂および芳香族ポリアミド繊維からなる組成物で構
成された保持器では、摩擦係数の変動が大きく摩耗ムラ
を生じ、トルク変動や軸振れが起こる欠点がある。A cage using a polyimide having thermally stable characteristics as a polymer composite material other than PTFE has a disadvantage that a large amount of gas is released in a vacuum. Also,
As in 1989, cages composed of a composition composed of thermoplastic polyether aromatic ketone, fluororesin and aromatic polyamide fiber have the disadvantage that the friction coefficient fluctuates greatly, causing uneven wear, torque fluctuation and shaft runout. There is.
このように、従来の高分子系複合材料や焼結材料など
から成る保持器は、荷重がかかる部分の摩耗の進行が早
く、このため内・外輪と転動体への潤滑剤の供給が均一
に行われず、トルクが不安定になったり、発塵が多くな
ることや軸受寿命が短かくなるという問題がある。As described above, in the conventional cage made of a polymer-based composite material or a sintered material, wear of a portion to which a load is applied progresses quickly, and therefore, the supply of the lubricant to the inner and outer rings and the rolling elements is uniform. However, there is a problem that the torque is not stable, dust is increased, and the bearing life is shortened.
本発明は、上記問題点を解消するためになされたもの
で、安定して均一な移着が行なわれることにより潤滑性
を向上させ、低トルク、長寿命、低発塵、低脱ガス性、
低騒音、低コストで加工が容易なころがり軸受用保持器
を提供することを目的とするものである。The present invention has been made in order to solve the above problems, and improves the lubricity by performing stable and uniform transfer, low torque, long life, low dust generation, low degassing,
An object of the present invention is to provide a low-noise, low-cost, easy-to-work rolling bearing retainer.
このため本発明は、ポリテトラフルオロエチレン樹脂
10〜40重量%とアラミド繊維5〜30重量%と二硫化モリ
ブデンおよび二硫化タングステンの一方または両方が5
〜30重量%と残部がポリエーテルエーテルケトン樹脂の
複合材料でころがり軸受用保持器を成形している。Therefore, the present invention is a polytetrafluoroethylene resin
10 to 40% by weight, 5 to 30% by weight of aramid fiber, and one or both of molybdenum disulfide and tungsten disulfide
Roller bearing cages are made of a composite material of polyetheretherketone resin, with the balance being ~ 30% by weight.
また、円周方向の摩擦を少なくするためにアラミド繊
維を軸方向に配列させている。Aramid fibers are arranged in the axial direction to reduce circumferential friction.
ポリエーテルエーテルケトン樹脂(以下PEEKと略す)
は強靭で耐熱性にも優れており、かつ、自己潤滑性があ
るが、樹脂単体では相手面に移着しにくいため、真空中
でガスの発生が少なく、低摩擦、低摩耗、耐熱性を有
し、相手面に移着しやすい層状固体潤滑剤であるPTFEと
MoS2およびWS2の一方または両方とを適量ずつ添加する
ことにより移着し易くかつ安定にするとともに、移着し
た膜の潤滑性が良好になる。Polyetheretherketone resin (hereinafter abbreviated as PEEK)
Is tough, has excellent heat resistance, and has self-lubricating properties.However, since it is difficult for the resin to transfer to the mating surface, there is little gas generation in vacuum, and low friction, low wear, and heat resistance are achieved. With PTFE, a layered solid lubricant that is easy to transfer to the mating surface
By adding one or both of MoS 2 and WS 2 in an appropriate amount, transfer becomes easy and stable, and lubricity of the transferred film becomes good.
なお、これらを添加したことによっておこる硬度およ
び強度の低下を耐熱性有機材料であるアラミド繊維を加
えることで防止できる。このアラミド繊維は自己潤滑性
を有するためガラス繊維のように摩擦面に露出しても潤
滑に影響することがない。PTFE単独では摩擦係数の変動
が大きいが、MoS2およびWS2の一方または両方を添加す
ることによって、均一で安定な潤滑膜を形成し摩擦係数
の変動を小さくすることができる。It should be noted that the hardness and strength reduction caused by the addition of these can be prevented by adding an aramid fiber which is a heat-resistant organic material. Since this aramid fiber has self-lubricating properties, it does not affect lubrication even when exposed to a friction surface like glass fiber. Although the coefficient of friction varies greatly with PTFE alone, the addition of one or both of MoS 2 and WS 2 can form a uniform and stable lubricating film and reduce the coefficient of friction fluctuation.
また、アラミド繊維を軸方向に配列させているので、
成形された保持器は円周方向のポケット壁と転動体とが
摩擦する部分はアラミド繊維の端面の突出がないので、
転動体に移着した膜を削り落とすことがなく、軸受は長
寿命を示す。アラミド繊維はガラス繊維に比べ機械加工
性に優れているので、その混合物は射出成形、押出成形
および圧縮成形ができ、加工コストが安価になる。In addition, since aramid fibers are arranged in the axial direction,
Since the molded cage has no protrusion of the end face of the aramid fiber, the part where the circumferential pocket wall and the rolling element rub does not
Since the film transferred to the rolling elements is not scraped off, the bearing has a long life. Since aramid fibers are more excellent in machinability than glass fibers, the mixture can be injection-molded, extruded and compressed, and the processing cost is reduced.
さらに、PEEKおよびこれに添加する材料はすべて真空
中で低脱ガス性を示すから、当然得られた成形品も低脱
ガス性を示す。Furthermore, since PEEK and the materials added to it all show low degassing properties in a vacuum, naturally the molded articles obtained also show low degassing properties.
以下、本発明を図に示す実施例を用いて詳述する。 Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings.
まず、PEEK粉末60重量%と市販のPTFE粉末20重量%と
長さ1mmのアラミド繊維10重量%とMoS2粉末10重量%を
それぞれ150℃で3時間加熱乾燥した後、十分に混合
し、さらに、150℃で1時間乾燥する。First, 60% by weight of PEEK powder, 20% by weight of commercially available PTFE powder, 10% by weight of aramid fiber having a length of 1 mm, and 10% by weight of MoS 2 powder are each heated and dried at 150 ° C. for 3 hours, and then sufficiently mixed. And dried at 150 ° C. for 1 hour.
なお、PEEKは英国ICI社から販売されている粉末状ま
たはペレット状のもの(連続使用可能温度240℃、融点3
34℃)を使用することができる。PEEK is a powder or pellet form sold by ICI of the United Kingdom (continuous use temperature 240 ° C, melting point 3
34 ° C) can be used.
この混合物をシリンダ温度360℃、金型温度380℃、射
出圧力1200kg/cm2、スクリュー回転数120rpmの条件によ
って、第1図に示すように金型(図示しない)の環状外
周面中央に設けた径方向のランナ2からキャビティに向
けて射出成形を行い、環状成形品1を得た。この成形品
ではアラミド繊維3が軸方向に並んでいる。これを金型
から取り出し280℃で2時間の加熱硬化を行った後、機
械加工によってポケット穴6を形成し、第2図に示す枠
番#608相当のアンギュラタイプの保持器5を作製し
た。This mixture was provided at the center of the annular outer peripheral surface of a mold (not shown) as shown in FIG. 1 under the conditions of a cylinder temperature of 360 ° C., a mold temperature of 380 ° C., an injection pressure of 1200 kg / cm 2 , and a screw rotation speed of 120 rpm. Injection molding was performed from the radial runner 2 toward the cavity, and an annular molded product 1 was obtained. In this molded product, the aramid fibers 3 are arranged in the axial direction. This was taken out of the mold and heat-cured at 280 ° C. for 2 hours. Then, a pocket hole 6 was formed by machining, and an angular-type cage 5 corresponding to frame number # 608 shown in FIG. 2 was produced.
つぎに、スパッタによって0.5μmのMoS2皮膜を施し
た内輪8、外輪9および転動体10とを組み合わせて第3
図に示すような玉軸受7を作製した。Next, the inner ring 8, the outer ring 9 and the rolling element 10 coated with a 0.5 μm MoS 2 film by sputtering are combined to form a third
A ball bearing 7 as shown in FIG.
この玉軸受7を下記の条件で耐久テストを行い、運転
時のモータトルク、軸受寿命および保持器の摩耗量を測
定した。This ball bearing 7 was subjected to a durability test under the following conditions, and the motor torque during operation, the bearing life, and the wear amount of the cage were measured.
・雰囲気圧力(2〜4)×10-7Torr、大気中 ・スラスト荷重7kg ・軸受温度 120℃ ・回転数1800rpm 比較例としてつぎの6種類からなる保持器の軸受を用
いて同様のテストを行った。・ Ambient pressure (2-4) × 10 -7 Torr, in the air ・ Thrust load: 7kg ・ Bearing temperature: 120 ℃ ・ Rotation speed: 1800rpm Similar tests were conducted using the following six types of cage bearings as comparative examples. Was.
(イ)30%WS2−MoS2含有の焼結青銅合金 (ロ)エカノール樹脂(芳香族ポリエステル系) (ハ)B4C含有セラミックス (ニ)鉛青銅鋳物(LBC3C) (ホ)ルーロンE(ふっ素樹脂系) (ヘ)MoS2を加えないPEEK系複合材料 測定により得られた結果を第4図および第1表に示
す。(B) 30% WS 2 -MoS 2 content of the sintered bronze alloy (b) Ekanoru resin (aromatic polyester) (c) B 4 C-containing ceramics (d) lead bronze casting (LBC3C) (e) Rulon E ( (Fluorine resin-based) (f) PEEK-based composite material without addition of MoS 2 The results obtained by the measurement are shown in FIG. 4 and Table 1.
第4図において運転時のモータトルクは小さい方が軸
受損失が少ないので良い。潤滑が悪くなるとトルクは上
昇し、ついには軸受が焼きついて寿命となる。図中のL
は寿命点示す。In FIG. 4, a smaller motor torque during operation is better because bearing loss is smaller. When lubrication deteriorates, the torque increases, and eventually the bearing seizes and its life is extended. L in the figure
Indicates the lifetime point.
本発明の保持器を使った玉軸受は比較例よりもモータ
トルクが小さく変動も少なく、かつ、長寿命である。The ball bearing using the cage of the present invention has a smaller motor torque and less fluctuation than the comparative example, and has a long life.
第1表の摩耗量は保持器の1回転当たりの摩耗体積
(×10-8mm3/rev)を示したものである。この結果か
ら、本発明の保持器の摩耗量は真空中、大気中とも他の
材質の保持器より小さいことか分かる。The wear amount in Table 1 shows the wear volume per rotation of the cage (× 10 −8 mm 3 / rev). From this result, it can be seen that the wear amount of the cage of the present invention is smaller than that of the cage made of another material both in vacuum and in air.
なお、本実施例では射出成形による方法を用いたが、
押出成形あるいは圧縮成形によっても成形することがで
きる。In addition, although the method by injection molding was used in this embodiment,
It can also be formed by extrusion or compression molding.
第5図はピンオンディスク摩擦試験機によるPEEKおよ
び複合材料の真空中における動摩擦係数を測定した結果
である。PEEK−PTFE−アラミド繊維の混合物では、第5
図(a)に示すように真空中の動摩擦係数は摩擦距離が
長くなれば小さくなっているが、変動は大きい。MoS2を
適量添加すると第5図(b)に示すように摩擦係数が小
さくなり、変動も小さい。摩擦面を観察すると前者は移
着ムラがあるのに対して、後者では摩擦面全面に均一な
移着が安定して生じており、MoS2を添加した効果が出て
いる。 FIG. 5 shows the results of measuring the dynamic friction coefficient of PEEK and composite materials in a vacuum using a pin-on-disk friction tester. For the PEEK-PTFE-aramid fiber mixture, the fifth
As shown in FIG. 5A, the dynamic friction coefficient in vacuum decreases as the friction distance increases, but the fluctuation is large. When an appropriate amount of MoS 2 is added, the coefficient of friction is reduced and the fluctuation is small, as shown in FIG. 5 (b). Observation of the friction surface shows that the former has transfer unevenness, while the latter shows stable transfer uniformly over the entire friction surface, and the effect of adding MoS 2 is obtained.
なお、二硫化モルブデンMoS2のかわりに、二硫化タン
グステンWS2を用い、あるいは両方を添加しても同様の
結果が得られた。Instead of disulfide Morubuden MoS 2, using a tungsten disulfide WS 2, or similar results by the addition of both was obtained.
以上、述べたように本発明のころがり軸受用保持器
は、ポリテトラフルオロエチレン樹脂10〜40重量%とア
ラミド繊維5〜30重量%と二硫化モリブデンおよび二硫
化タングステンの一方または両方が5〜30重量%と残部
がポリエーテルエーテルケトン樹脂の複合材料で構成し
てあるので、軸受が回転するときに保持器のポケット壁
と転動体とがすべり摩擦をおこし、この時保持器から転
動体に適量ずつ安定して薄膜を移着しつづけ、潤滑性を
良好に保持し、摩擦係数が小さく変動が少ないので低摩
耗で長寿命が得られるとともに、潤滑ムラをなくして運
転損失を小さくすることができる。As described above, the rolling bearing cage of the present invention has a polytetrafluoroethylene resin content of 10 to 40% by weight, an aramid fiber of 5 to 30% by weight, and one or both of molybdenum disulfide and tungsten disulfide having a content of 5 to 30%. Since the weight% and the balance are composed of a composite material of polyetheretherketone resin, when the bearing rotates, sliding friction occurs between the pocket wall of the cage and the rolling element. It keeps transferring thin films stably each time, keeps good lubricity, and has low friction coefficient and little fluctuation, so low wear and long life can be obtained, and operating loss can be reduced by eliminating uneven lubrication. .
また、真空中でのガラスの発生がなく、大気中でも保
持器の摩耗が少ないので両方の雰囲気で使うことがで
き、保持器が合成樹脂でできているため摩擦音が小さく
機械加工性に優れたころがり軸受を提供することができ
る。In addition, there is no generation of glass in a vacuum and there is little abrasion of the cage even in the atmosphere, so it can be used in both atmospheres, and since the cage is made of synthetic resin, the friction noise is small and rolling is excellent in machinability Bearings can be provided.
なお、アラミド繊維を軸方向に配列させることによ
り、円周方向の耐摩耗性を大きくすることができ、さら
に寿命を長くし、発塵を少なくし得る効果がある。In addition, by arranging the aramid fibers in the axial direction, the wear resistance in the circumferential direction can be increased, and there is an effect that the life can be prolonged and dust generation can be reduced.
第1図は本発明の保持器を製作するための円筒状射出成
形時の概略斜視図、第2図は本発明のころがり軸受用保
持器の斜視図、第3図は本発明の保持器を組み込んだ玉
軸受の構成を示す断面図、第4図は玉軸受のモータトル
クの変化と寿命を示す特性図、第5図は摩擦係数の測定
結果を示す特性図である。 なお、1は環状成形品、2はランナ、3はアラミド繊
維、5は保持器、6はポケット穴、7は玉軸受、8は内
輪、9は外輪、10は転動体を示す。FIG. 1 is a schematic perspective view of a cylindrical injection molding for manufacturing the cage of the present invention, FIG. 2 is a perspective view of a rolling bearing cage of the present invention, and FIG. 3 is a cage of the present invention. FIG. 4 is a cross-sectional view showing the configuration of the incorporated ball bearing, FIG. 4 is a characteristic diagram showing changes in motor torque and life of the ball bearing, and FIG. 5 is a characteristic diagram showing measurement results of the coefficient of friction. Reference numeral 1 denotes an annular molded product, 2 denotes a runner, 3 denotes an aramid fiber, 5 denotes a cage, 6 denotes a pocket hole, 7 denotes a ball bearing, 8 denotes an inner ring, 9 denotes an outer ring, and 10 denotes a rolling element.
Claims (2)
量%とアラミド繊維5〜30重量%と二硫化モリブデンお
よび二硫化タングステンの一方または両方が5〜30重量
%と残部がポリエーテルエーテルケトン樹脂の複合材料
から成ることを特徴とするころがり軸受用保持器。1. A polytetrafluoroethylene resin of 10 to 40% by weight, an aramid fiber of 5 to 30% by weight, one or both of molybdenum disulfide and tungsten disulfide of 5 to 30% by weight, and a balance of polyether ether ketone resin. A cage for a rolling bearing, comprising a composite material.
とを特徴とする請求項1記載のころがり軸受用保持器。2. The roller bearing retainer according to claim 1, wherein said aramid fibers are arranged in an axial direction.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17686689 | 1989-07-07 | ||
JP1-176866 | 1989-07-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH03129120A JPH03129120A (en) | 1991-06-03 |
JP2931868B2 true JP2931868B2 (en) | 1999-08-09 |
Family
ID=16021177
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2179828A Expired - Lifetime JP2931868B2 (en) | 1989-07-07 | 1990-07-06 | Roller bearing cage |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2931868B2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0788853B2 (en) * | 1990-07-16 | 1995-09-27 | 株式会社安川電機 | Rolling bearing |
EP0569808A1 (en) * | 1992-05-09 | 1993-11-18 | Btr Industries Limited | Heat exchanger |
CN100359191C (en) * | 2003-03-04 | 2008-01-02 | 丁树华 | Non-metal light-load rolling bearing |
JP4705533B2 (en) * | 2006-08-29 | 2011-06-22 | 泰典 堀 | bed |
JP5521761B2 (en) * | 2010-05-17 | 2014-06-18 | 日本精工株式会社 | Roller bearing cage, resin component and cage manufacturing method |
WO2020262029A1 (en) * | 2019-06-25 | 2020-12-30 | ミネベアミツミ株式会社 | Ball bearing |
-
1990
- 1990-07-06 JP JP2179828A patent/JP2931868B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH03129120A (en) | 1991-06-03 |
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