JPS6249017A - Rolling bearing - Google Patents

Abstract

PURPOSE:To provide a roller bearing which is lightweight, highly lubricatable, quiet and durable against a high speed operation, by coupling a wear-resistant synthetic resin roller with a holder made of self-lubricating materials which are worn easier than the material of the roller. CONSTITUTION:Between synthetic resin outer and inner races 1, 2 is disposed a holder 4 and a ball 3 which are made of synthetic wear-resistant materials such as, for example, polyamide containing self-lubricant materials such as, for example, PTEF resin, molybdenum disulfide, carbon or the like, and therefore, are protected therebetween. In this arrangements, the material of the holder 4 is of a self-lubricating type, softer and easier in abrasion, than that of the ball 3, and is composed of PTEF resin containing 20 to 30% of glass fibers and 5 to 10% molybdenum sulfide, etc. Accordingly, materials ground off due to sliding abrasion between the holder 4 and the ball 3 forms lubricant films on all sections, and therefore,the thus obtained bearing is lightweight, highly lubricatable, quiet and usable in a high speed operation, and has a long life.

Description

【発明の詳細な説明】 〈産業上の利用分野〉 この発明は、たとえばプラスチックフィルム延伸装置の
テンタークリップ用軸受のように、環境汚染を避けるべ
き場所等での使用に好適な自己潤滑式の転がり軸受に関
する。[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a self-lubricating rolling bearing suitable for use in places where environmental pollution should be avoided, such as a tenter clip bearing for a plastic film stretching device. Regarding bearings.

〈従来の技術〉 合成樹脂製の転がり軸受は周知であり、軽重で耐薬品性
、潤滑性にすぐれ、また騒音を発しない特長も備え、各
種の用途に広く用いられている。<Prior Art> Synthetic resin rolling bearings are well known and are widely used in various applications because they are light and heavy, have excellent chemical resistance, lubricity, and do not emit noise.

また、合成樹脂の強度不足を補うために、金属補強片を
内輪や外輪、あるいは転動体に埋め込むことも公知であ
る（たとえば、特公昭３７−７２５５号公報参照）。こ
れらの転がり軸受は、合成樹脂の潤滑性を利用しており
、−・般にグリース等の潤滑剤を使用しない無潤滑軸受
であるのが普通であり、グリースの蒸発等による環境汚
染を避ける必要のある場所に使用されることが多い。It is also known to embed metal reinforcing pieces in the inner ring, outer ring, or rolling element in order to compensate for the lack of strength of the synthetic resin (for example, see Japanese Patent Publication No. 37-7255). These rolling bearings utilize the lubricity of synthetic resin, and are generally non-lubricated bearings that do not use lubricants such as grease, so it is necessary to avoid environmental pollution caused by grease evaporation. It is often used where there is.

しかしながら、この種の転がり軸受は、転動体か保持器
と接触すると、両者の硬度差の関係ですべり摩擦により
転動体が短時間で摩耗してしまうため、保持器のないい
わゆる総ボール、ころ形式のものしか実用化されていな
い。このように、保持器がないため転動体相互の摩擦が
避けられず、高速回転で使用すると、軸受）・ルクの増
大や発熱が生じ、更には焼付を生ずる可能性があるため
、高速回転部の軸受として用いることができなかった。However, in this type of rolling bearing, when the rolling elements come into contact with the cage, the rolling elements wear out in a short time due to sliding friction due to the hardness difference between the two, so this type of rolling bearing is a so-called full ball, roller type bearing without a cage. Only those that have been put into practical use. In this way, since there is no cage, friction between the rolling elements is unavoidable, and when used at high speeds, the bearing torque increases, heat generation occurs, and there is a possibility of seizure. It could not be used as a bearing.

〈発明の目的〉 そこで、この発明の目的は、軽量で耐薬品性、潤滑性、
静粛性などの合成樹脂製軸受の有する特長を備えており
、しかも高速回転に用いることのできる転がり軸受を提
供することにある。<Objective of the invention> Therefore, the object of the present invention is to provide a lightweight, chemical-resistant, lubricious,
The object of the present invention is to provide a rolling bearing that has the features of synthetic resin bearings such as quietness and can be used for high-speed rotation.

〈発明の構成〉 上記目的を達成するため、この発明の転がり軸受は、転
動体を耐摩耗性を有する合成樹脂で形成し、上記転動体
を周方向に所定間隔をあけて保持する保持器を、上記転
動体の材料よりも摩耗しやずくかつ自己潤滑性を存する
材料で形成しｆこことを特徴としている。<Structure of the Invention> In order to achieve the above object, the rolling bearing of the present invention includes rolling elements made of synthetic resin having wear resistance, and a retainer that holds the rolling elements at predetermined intervals in the circumferential direction. It is characterized by being made of a material that is more wear-resistant than the material of the rolling elements and has self-lubricating properties.

〈発明の作用〉 北記溝成により、回転時には保持器と転動体とが接触し
て保持器が削られ、自己潤滑性を有する材料が転動体に
転移し、次いて内外両輪の軌道面に転移されて転動体と
軌道面の表面に潤滑膜が形成され、円滑作用が行なわれ
る。ここで、転動体は耐摩耗性を有ずろ合成樹脂を用い
ており、しかし保持器は転動体よりも摩耗しやすい材料
を用いているので、転動体の摩耗は極めて少ない。また
、保持器が用いられているため転動体相互の接触はなく
、高速回転が可能である。したがって、寿命が長く、高
速回転にも耐えうる自己潤滑式の転がり軸受を得ること
ができる。<Function of the Invention> Kitaki Mizosei discovered that during rotation, the cage and rolling elements come into contact and the cage is scraped, and a self-lubricating material is transferred to the rolling elements, and then on the raceway surfaces of both the inner and outer rings. As a result, a lubricating film is formed on the surfaces of the rolling elements and raceways, providing a smoothing effect. Here, the rolling elements are made of abrasion-resistant synthetic resin, but the cage is made of a material that is more easily worn than the rolling elements, so the wear of the rolling elements is extremely small. Furthermore, since a cage is used, there is no contact between the rolling elements and high speed rotation is possible. Therefore, it is possible to obtain a self-lubricating rolling bearing that has a long life and can withstand high-speed rotation.

〈実施例〉 以下、この発明を図示の実施例により詳細に説明する。<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

第１図において、１はリング状に形成され、内周面に軌
道面１ａを備えた外輪、２は上記外輪ｌより小径のリン
グ状に形成され、外周面に軌道面２ａを備えた内輪、３
，３・・は上記外輪ｌの軌道面１ａと上記内輪２の軌道
面２ａとの間に介設されろ転動体としてのボール、４は
上記ボール３゜３・・を周方向に所定間隔をあけて保持
する保持器である。上記外輪ｌおよび内輪２は、金属材
料または合成樹脂で形成されるもので、たとえば高速度
工具鋼を用いて作られている。上記ボール３は、耐摩耗
性を有する合成樹脂で形成されるもので、芳香族ポリイ
ミド、ポリアミノヒスマレイミド、ポリアミドイミドな
どのポリイミド樹脂、または、ポリフェニレンザルファ
イド（ＰＰＳ）、ポリエーテルスルホン（ＰＥＳ）なと
゛のポリエーテルｖ１ｔｌＩ旨、あるいは、ポリオキソ
ベンゾイルなどのポリエステル樹脂のような何機系耐熱
耐摩耗性材料の成形によって作られている。前記材料は
ポリ四ふっ化エチレン樹脂（以下、ＰＴＦＥ樹脂という
）、二硫化モリブデン、カーボン等の自己潤滑性材料を
混入したちのを含む。また上記保持器４は、上記ボール
３よりも軟質で摩耗しやすく、しかも自己潤滑性を有す
る材料で形成される乙ので、たとえば、ＰＴＦＥ樹脂に
２０〜３０％のガラス繊維と、５〜１０％の二硫化モリ
ブデンを加えた材料の成形によって作られている。In FIG. 1, 1 is an outer ring formed in a ring shape and has a raceway surface 1a on its inner peripheral surface; 2 is an inner ring that is formed in a ring shape with a smaller diameter than the outer ring 1 and has a raceway surface 2a on its outer peripheral surface; 3
, 3... are balls interposed between the raceway surface 1a of the outer ring 1 and the raceway surface 2a of the inner ring 2 as rolling elements, and 4 are the balls 3° 3... arranged at a predetermined interval in the circumferential direction. It is a retainer that is held open. The outer ring 1 and the inner ring 2 are made of a metal material or a synthetic resin, and are made of high-speed tool steel, for example. The ball 3 is made of a synthetic resin having wear resistance, such as polyimide resin such as aromatic polyimide, polyaminohismaleimide, polyamideimide, polyphenylene sulfide (PPS), polyether sulfone (PES), etc. It is made by molding several types of heat-resistant and wear-resistant materials such as polyether resins or polyester resins such as polyoxobenzoyl. The materials include those mixed with self-lubricating materials such as polytetrafluoroethylene resin (hereinafter referred to as PTFE resin), molybdenum disulfide, and carbon. Furthermore, the retainer 4 is made of a material that is softer than the balls 3, wears more easily, and has self-lubricating properties. It is made by molding a material to which molybdenum disulfide has been added.

上記保持器４は、第２図に示すように、左右方向Ａに２
分割されていて、各部材４ａ、４ｂで内、外輪２．１の
間に配列されたｉ夏数個のボール３゜３・・・を左右か
ら挾み、各ボール３の間でリベット５．５・・・をかし
めることにより、ボール３．３・・を所定間隔をあけて
保持する作用をしている。As shown in FIG. 2, the cage 4 has two
Several balls 3.3... arranged between the inner and outer rings 2.1 are sandwiched between the left and right sides by each member 4a, 4b, and a rivet 5.3 is inserted between each ball 3. By caulking 5..., the balls 3, 3... are held at a predetermined interval.

この実施例の転がり軸受は」上記のように構成されてお
り、（史用時には次のような作用で潤滑が行なわれる。The rolling bearing of this embodiment is constructed as described above, and lubrication is performed by the following action when in use.

すなわち、軸受の回転時には、保持器４はホール３．３
・・・に接触しながら案内されろが、ボール３．３・・
・の材料より保持器４の材料が軟いのでボール３とのす
べり摩擦によって保持器４が少しずつ削られ、保持器４
の材料がボール３．３・・・の表面３ａに転移し、更に
回転とと乙に外輪１の軌道面１ａおよび内輪２の軌道面
２ａにも転移し、それらの表面にＰＴＦＥ樹脂と二硫化
モリブデンの混ざった潤滑膜が形成される。この潤滑膜
の形成は軸受の使用が開始された初期回転時から始まり
、一旦潤滑膜が形成されるとその潤滑力によって保持器
４が削られる量は減少し、保持器４の摩耗が極めて少な
い定常回転の状態となる。またボール３．３・・・は、
潤滑膜による潤滑作用と自身が耐摩耗性材料であること
から、はとんど摩耗は生じない。That is, when the bearing rotates, the retainer 4 closes the holes 3.3.
The ball is guided while touching... 3.3...
Since the material of the cage 4 is softer than the material of the cage 4, the cage 4 is scraped little by little by the sliding friction with the balls 3
The material transfers to the surface 3a of the balls 3.3, and further transfers to the raceway surface 1a of the outer ring 1 and the raceway surface 2a of the inner ring 2 during rotation, and PTFE resin and disulfide are deposited on those surfaces. A lubricating film containing molybdenum is formed. The formation of this lubricant film starts from the initial rotation when the bearing starts to be used, and once the lubricant film is formed, the amount of scraping of the retainer 4 due to its lubricating force is reduced, and the wear of the retainer 4 is extremely small. It becomes a state of steady rotation. Also, ball 3.3... is
Due to the lubrication effect of the lubricating film and the fact that it is a wear-resistant material, wear rarely occurs.

こうして保持器４から潤滑剤が供給されて自己潤滑が行
なわれ、しかも各ボール３．３・・・は保持器４により
保持されていて相互に接触することがないから、高速回
転時でもボール３，３・・・の接触による軸受トルクの
増大や発熱、焼付等の不都合を生ずることもなく、高速
回転に耐えることができる。また通常のグリースを使用
した軸受のように、グリースの蒸発や飛散で環境汚染を
生ずることももちろんない。したがって、たとえば高温
かつ高速な条件下で使用され、しかも環境汚染を避けな
ければならないプラスチックフィルム延伸装置のテンタ
ークリップ用軸受として用いるのに適しているなど、潤
滑剤としてグリース等の浦を使用できず、しかし高速回
転が行なわれる各種用途に適する転かり軸受が得られる
。In this way, lubricant is supplied from the cage 4 and self-lubrication is performed, and since each ball 3.3... is held by the cage 4 and does not come into contact with each other, even during high speed rotation , 3... can withstand high-speed rotation without causing problems such as an increase in bearing torque, heat generation, or seizure due to contact. Also, unlike bearings that use normal grease, there is no risk of environmental pollution caused by evaporation or scattering of grease. Therefore, it is suitable for use as tenter clip bearings in plastic film stretching equipment, which are used under high temperature and high speed conditions and must avoid environmental pollution. However, a rolling bearing suitable for various applications involving high-speed rotation can be obtained.

〈発明の効果〉 以上述べたように、この発明は、転動体を耐摩耗性を有
する合成樹脂で形成するとともに、転動体の材料よりも
摩耗しやすくかつ自己潤滑性を有する材料で形成された
保持器を設けたものである。<Effects of the Invention> As described above, the present invention provides rolling elements that are made of a synthetic resin that is wear-resistant, and that are also made of a material that wears more easily than the material of the rolling elements and has self-lubricating properties. It is equipped with a cage.

したがって、軽量で耐薬品性、潤滑性、静粛性などにす
ぐれるという合成樹脂製転がり軸受の一般的な特長はす
べて備え、保持器により転動体が保持されて、転動体が
相互い接触することがなくて高速回転にも耐えることが
でき、しかも転動体の摩耗が少なく長寿命である転がり
軸受を容易に得ることができるのである。Therefore, it has all the general features of synthetic resin rolling bearings, such as being lightweight, excellent in chemical resistance, lubricity, and quietness, and the cage holds the rolling elements, allowing them to come into close contact with each other. Therefore, it is possible to easily obtain a rolling bearing that can withstand high-speed rotation, has little wear on the rolling elements, and has a long life.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの発明の一実施例の断面図、第２図は第１図
のｌｌ−ＩＩ線に沿う展開断面図である。 ■・・・外輪、２・・内輪、３・・・ボール（転動体）
、４・・・保持器。 特許出願人　光洋精工株式会社　外１名代　理　人　弁
理士　青白　葆　外２名第１図FIG. 1 is a cross-sectional view of one embodiment of the present invention, and FIG. 2 is a developed cross-sectional view taken along line II--II in FIG. ■...Outer ring, 2...Inner ring, 3...Ball (rolling element)
, 4...retainer. Patent applicant: Koyo Seiko Co., Ltd. 1 other attorney Patent attorney: Aohaku Ao and 2 other attorneys Figure 1

Claims (3)

【特許請求の範囲】[Claims] （１）内輪と外輪の間に配置される複数個の転動体を耐
摩耗性を有する合成樹脂で形成し、上記複数個の転動体
を周方向に所定間隔をあけて保持する保持器を上記転動
体の材料よりも摩耗しやすくかつ自己潤滑性を有する材
料で形成したことを特徴とする転がり軸受。(1) A plurality of rolling elements disposed between the inner ring and the outer ring are formed of a synthetic resin having wear resistance, and a cage for holding the plurality of rolling elements at predetermined intervals in the circumferential direction is provided as described above. A rolling bearing characterized in that it is made of a material that wears more easily than the material of the rolling elements and has self-lubricating properties. （２）上記特許請求の範囲第１項に記載の転がり軸受に
おいて、 上記転動体の材料として、ポリイミド樹脂、ポリエーテ
ル樹脂、ポリエステル樹脂等の主鎖中に芳香族をもつ有
機系耐熱耐摩耗性材料を用いた転がり軸受。(2) In the rolling bearing according to claim 1 above, the material of the rolling elements is an organic heat-resistant and wear-resistant material having an aromatic group in the main chain such as polyimide resin, polyether resin, polyester resin, etc. Rolling bearings using materials. （３）上記特許請求の範囲第１項または第２項に記載の
転がり軸受において、 上記保持器の材料としてポリ四ふっ化エチレン樹脂に２
０乃至３０％のガラス繊維および５乃至１０％の二硫化
モリブデンを加えたものを用いた転がり軸受。(3) In the rolling bearing according to claim 1 or 2 above, polytetrafluoroethylene resin is used as the material of the cage.
Rolling bearings with the addition of 0 to 30% glass fiber and 5 to 10% molybdenum disulfide.