JPH08200372A - Rolling bearing - Google Patents
Rolling bearingInfo
- Publication number
- JPH08200372A JPH08200372A JP2456795A JP2456795A JPH08200372A JP H08200372 A JPH08200372 A JP H08200372A JP 2456795 A JP2456795 A JP 2456795A JP 2456795 A JP2456795 A JP 2456795A JP H08200372 A JPH08200372 A JP H08200372A
- Authority
- JP
- Japan
- Prior art keywords
- cage
- lubricating oil
- oil
- bearing
- polyolefin
- 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
Landscapes
- Rolling Contact Bearings (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、苛酷な条件下でＨＤＤ
やＶＴＲ、ＤＡＴ、ＬＢＰ等の回転支持部に使用される
各種転がり軸受に関し、より詳細には、潤滑性（トル
ク、音響特性）を向上させ、且つ寿命が長く、防錆性に
富んだ転がり軸受に関する。BACKGROUND OF THE INVENTION The present invention relates to an HDD under severe conditions.
The present invention relates to various rolling bearings used for rotation supporting parts such as VTRs, DATs, and LBPs. More specifically, rolling bearings having improved lubricity (torque and acoustic characteristics), long life, and excellent anticorrosion properties. Regarding
【０００２】[0002]
【従来の技術】転がり軸受は、図１に示されるように、
外周面に内輪軌道１を有する内輪２と、内周面に外輪軌
道３を有する外輪４とを同心に配置し、内輪軌道１と外
輪軌道３との間に複数個の転動体５を転動自在に設ける
事で構成されている。外輪４の両端部内周面には、それ
ぞれ円輪状のシール板６の外周縁を係止し、両シール板
６によって転動体５の設置部分に存在するグリースや発
生したダスト（発塵）が外部に漏洩したり、或は外部に
浮遊する塵芥が転動体５の設置部分に侵入したりするの
を防止している。2. Description of the Related Art Rolling bearings, as shown in FIG.
An inner ring 2 having an inner ring raceway 1 on the outer peripheral surface and an outer ring 4 having an outer ring raceway 3 on the inner peripheral surface are concentrically arranged, and a plurality of rolling elements 5 are rolled between the inner ring raceway 1 and the outer ring raceway 3. It is configured by being provided freely. The outer peripheral edge of a circular ring-shaped seal plate 6 is locked to the inner peripheral surfaces of both ends of the outer ring 4 so that grease and dust (generated dust) existing in the installation portion of the rolling element 5 can be externalized by the both seal plates 6. It is prevented that the dust leaks to the inside of the rolling element 5 or that dust that floats outside intrudes into the installation portion of the rolling element 5.
【０００３】また、複数個の転動体５は、図２に示す様
な保持器７に転動自在に保持されている。この保持器７
は、合成樹脂を射出成形する事により、一体に形成され
ている。即ち、この保持器７は、円環状の主部８と、こ
の主部８の片面に設けられた複数組の保持部９とを備え
ている。各保持部９は、互いに間隔をあけて配置された
１対の弾性片１０から成る。各保持部９を構成する１対
の弾性片１０の互いに対向する面は、互いに同心の球状
又は円筒状の凹面をなしている。各転動体５は、各弾性
片１０の間隔を弾性的に押し広げつつ、上記１対の弾性
片１０の間に押し込む事により、各保持部９に転動自在
に保持される。A plurality of rolling elements 5 are rotatably held by a cage 7 as shown in FIG. This cage 7
Are integrally formed by injection molding a synthetic resin. That is, the holder 7 includes an annular main portion 8 and a plurality of sets of holding portions 9 provided on one surface of the main portion 8. Each holding part 9 is composed of a pair of elastic pieces 10 arranged at intervals. The surfaces of the pair of elastic pieces 10 forming each holding portion 9 that face each other are concave surfaces having concentric spherical or cylindrical shapes. Each rolling element 5 is rotatably held by each holding portion 9 by being pushed between the pair of elastic pieces 10 while elastically widening the space between the elastic pieces 10.
【０００４】一般に保持器７に使用されている材料は、
金属、又はポリアミド樹脂、ポリアセタール樹脂、ポリ
ブチレンテレフタレート樹脂等の射出成形可能な合成樹
脂が単体、若しくはガラス繊維、カーボン繊維、有機繊
維等で強化した合成樹脂組成物が使用されている。ま
た、保持器７は転動体５を保持する機能しか有しておら
ず、転がり軸受の潤滑には、多量の潤滑油、又はグリー
ス等の半固体状潤滑剤が使用されている。特に、多量の
潤滑油が使用できずにグリース等の半固体状潤滑剤を使
用した場合、該潤滑剤に起因する攪拌抵抗のため、軸受
により支持された軸等を回転させるために要するトルク
が大きく、しかも回転に伴ってのトルク変動も大きくな
りやすい。The material generally used for the cage 7 is
An injection-moldable synthetic resin such as a metal or a polyamide resin, a polyacetal resin, or a polybutylene terephthalate resin is used alone, or a synthetic resin composition reinforced with glass fiber, carbon fiber, organic fiber or the like is used. Further, the cage 7 has only a function of holding the rolling elements 5, and a large amount of lubricating oil or a semi-solid lubricant such as grease is used for lubricating the rolling bearing. In particular, when a large amount of lubricating oil cannot be used and a semi-solid type lubricant such as grease is used, the torque required to rotate the shaft supported by the bearing is caused by the stirring resistance due to the lubricant. The torque fluctuation is large and the torque fluctuation with rotation is likely to be large.
【０００５】そこで、従来より保持器７自体に潤滑機能
を付与した転がり軸受も提案されている。例えば、特開
昭６１−６４２９号公報には、圧縮成形により多孔質に
成形されたポリアミドイミド樹脂にフッ素化油を含浸さ
せた軸受保持器が開示されている。また、特開平１−９
３６２３号公報には、油を含有するバインダと母材とか
らなる含油プラスチックを成形した保持器を、潤滑油中
に含浸させた保持器が開示されている。Therefore, a rolling bearing in which the cage 7 itself is provided with a lubricating function has been conventionally proposed. For example, Japanese Unexamined Patent Publication No. 61-6429 discloses a bearing cage in which a polyamide-imide resin formed into a porous shape by compression molding is impregnated with a fluorinated oil. In addition, JP-A-1-9
Japanese Patent No. 3623 discloses a cage obtained by impregnating lubricating oil with a cage formed by molding an oil-containing plastic composed of a binder containing oil and a base material.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記特
開昭６１−６４２９号公報や特開平１−９３６２３号公
報等に記載されているような潤滑油を含浸させた保持器
を組み込んだ転がり軸受においては、転がり軸受の回転
に伴って保持器の表面から潤滑油が徐々に滲み出し、長
期にわたり潤滑作用が付与されるものの、回転初期や低
速回転時における潤滑性に関しては必ずしも充分とはい
えない状況にある。また、含浸される潤滑油は、保持器
を形成する樹脂との親和性から、例えば防錆剤等の他の
物質を添加して転がり軸受に潤滑性と共に他の特性を付
与することは困難である。However, in a rolling bearing incorporating a cage impregnated with lubricating oil as described in JP-A-61-6429 and JP-A-1-93623. Is a situation in which the lubricating oil gradually exudes from the surface of the cage as the rolling bearing rotates, giving a lubricating action for a long period of time, but the lubricity at the initial stage of rotation or at low speed is not always sufficient. It is in. Further, since the impregnated lubricating oil has an affinity with the resin forming the cage, it is difficult to add other substances such as a rust preventive agent to the rolling bearing to impart lubricity and other characteristics. is there.
【０００７】そこで本発明の目的は、長期にわたる潤滑
性を維持するとともに、回転初期や低速回転時における
潤滑性にも優れ、しかも低トルクでトルク変動もなく、
また防錆性等の潤滑性以外の特性も容易に付与できる転
がり軸受を提供することにある。Therefore, an object of the present invention is to maintain lubricity for a long period of time, and also to provide excellent lubricity at the initial stage of rotation and during low-speed rotation, low torque and no torque fluctuation.
Another object of the present invention is to provide a rolling bearing capable of easily imparting characteristics other than lubricity such as rust prevention.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明の転がり軸受は、耐熱性および耐油性を有す
る樹脂とポリオレフィンとからなる樹脂組成物を所望の
保持器形状に成形してなる成形体を潤滑油中に浸漬して
得られた保持器を組み込み、且つオイルプレーティング
を施したことを特徴とする。In order to achieve the above object, the rolling bearing of the present invention is obtained by molding a resin composition comprising a resin having heat resistance and oil resistance and polyolefin into a desired cage shape. It is characterized in that a cage obtained by immersing a molded body of the following in a lubricating oil is incorporated and oil plating is performed.
【０００９】[0009]
【作 用】耐熱性および耐油性を有する樹脂（以下、耐
熱耐油性樹脂と称する）とポリオレフィンとからなる樹
脂組成物を軸受用保持器の形状に成形した成形体を潤滑
油中で浸漬処理することによって、保持器には一定量の
潤滑油が含浸される。ここで、保持器となる前記樹脂組
成物が潤滑油と親和性の高いポリオレフィンを含むこと
により、保持器中の潤滑油の含有量が多くなるととも
に、潤滑油の保持力も大きくなり、もって潤滑油が長期
間安定して転動体の転動部分に供給される。そのため、
この保持器を組込んだ転がり軸受は回転に要するトルク
が低減すると共に、このトルクの変動が小さくなる。し
かも、樹脂組成物の母材となる耐熱耐油性樹脂とポリオ
レフィンとは、射出成形時における剪断速度下での溶融
粘度が異なり、この粘度差により耐熱耐油性樹脂中に分
散するポリオレフィンの縦横比が大きくなり吸油性能が
向上する。特に、射出成形時のポリオレフィンの溶融粘
度が耐熱耐油性樹脂の溶融粘度より低いほど、射出成形
品の表面をポリオレフィンが多く占有し、表面にポリオ
レフィンの特性が付与されるため、更に吸油性能が向上
する。また、保持器の機械的強度に関しても、保持器形
状に成形した後に、潤滑油中に浸漬するために、成形時
におけるウエルドラインの発生もなく、機械的強度に優
れる。更に、前記保持器を組み込んだ転がり軸受にオイ
ルプレーティングを施すことにより、転がり軸受の全露
出面に一定量の潤滑油が均一に付着される。従って、回
転初期や低速回転時のように、前記保持器からの潤滑油
の滲み出しが充分でない場合でも、表面に付着した潤滑
油により潤滑性が付与される。また、オイルプレーティ
ング用の潤滑油に他の特性付与剤を添加することによ
り、潤滑性に加えて他の特性を付与できる。例えば、オ
イルプレーティング用潤滑油に防錆剤を添加することに
より、特に高温度で使用される転がり軸受に多く見られ
る、錆の発生を抑制することができる。[Operation] A molded product obtained by molding a resin composition composed of a resin having heat resistance and oil resistance (hereinafter referred to as heat and oil resistance resin) and polyolefin into the shape of a cage for bearings is immersed in lubricating oil. As a result, the cage is impregnated with a certain amount of lubricating oil. Here, since the resin composition to be the cage contains a polyolefin having a high affinity with the lubricating oil, the content of the lubricating oil in the cage is increased, and the retaining force of the lubricating oil is also increased. Is stably supplied to the rolling part of the rolling element for a long period of time. for that reason,
The rolling bearing incorporating this retainer reduces the torque required for rotation and reduces the fluctuation of this torque. Moreover, the heat- and oil-resistant resin that is the base material of the resin composition and the polyolefin have different melt viscosities under shear rate during injection molding, and the aspect ratio of the polyolefin dispersed in the heat- and oil-resistant resin is different due to this viscosity difference. It becomes larger and the oil absorption performance improves. In particular, as the melt viscosity of the polyolefin during injection molding is lower than that of the heat- and oil-resistant resin, the surface of the injection-molded product is occupied by the polyolefin more, and the characteristics of the polyolefin are given to the surface, further improving the oil absorption performance. To do. Also, regarding the mechanical strength of the cage, since the cage is shaped into a cage shape and then immersed in lubricating oil, no weld line is generated during molding, and the mechanical strength is excellent. Further, by applying oil plating to the rolling bearing in which the cage is incorporated, a fixed amount of lubricating oil is uniformly attached to the entire exposed surface of the rolling bearing. Therefore, even when the leaching of the lubricating oil from the retainer is not sufficient, as in the initial stage of rotation or during low-speed rotation, the lubricating oil attached to the surface provides lubricity. Further, by adding another property imparting agent to the lubricating oil for oil plating, it is possible to impart other properties in addition to the lubricity. For example, by adding a rust preventive agent to the lubricating oil for oil plating, it is possible to suppress the occurrence of rust, which is often found in rolling bearings used particularly at high temperatures.
【００１０】以下、本発明に係る転がり軸受に関して詳
細に説明する。本発明に係る転がり軸受に組み込まれる
保持器は、耐熱耐油性樹脂とポリオレフィンとの混合樹
脂組成物を所望の保持器形状に成形し、潤滑油中に浸漬
することにより得られる。The rolling bearing according to the present invention will be described in detail below. The cage to be incorporated into the rolling bearing according to the present invention is obtained by molding a mixed resin composition of a heat and oil resistant resin and a polyolefin into a desired cage shape and immersing it in lubricating oil.
【００１１】前記耐熱耐油性樹脂は、保持器の形状を形
成および維持する役割を果たすために耐熱性能および耐
油性能に優れることが好ましく、例えばポリアミド、ポ
リアセタール、ポリエチレンテレフタレート、ポリブチ
レンテレフタレート、ポリカーボネート、ポリフェニレ
ンサルファイド、ポリエーテルサルフォン、ポリエーテ
ルイミド、ポリアミドイミド、ポリエーテルエーテルケ
トン等を好適に例示できる。特に、ポリアミド樹脂は耐
熱性能や耐油性能に加えて、価格が安価な事やポリオレ
フィンによる改質の容易性から好適である。The heat and oil resistant resin is preferably excellent in heat resistance and oil resistance because it plays a role of forming and maintaining the shape of the cage. For example, polyamide, polyacetal, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyphenylene. Preferable examples include sulfide, polyether sulfone, polyether imide, polyamide imide, and polyether ether ketone. In particular, a polyamide resin is preferable because it is inexpensive and easily modified with polyolefin in addition to heat resistance and oil resistance.
【００１２】前記ポリオレフィンは、耐熱耐油性樹脂中
に分散されて、潤滑油を保持する役割を果たす。例えば
ポリエチレン、ポリプロピレン、ポリ−１−ブテン、ポ
リ−４−メチル−１−ペンテン、及びそれらの共重合体
を単独、又は２種以上を組合わせて用いてよい。また、
これらポリオレフィンは前記耐熱耐油性樹脂と混合した
際に、単に溶融混練しただけで優れた機械的特性が発揮
されない場合は、該ポリオレフィンを適当な官能基でグ
ラフト変性したグラフト変性ポリオレフィンとしてもよ
いし、又はそのグラフト変性ポリオレフィン、若しくは
適当な相溶化剤を母材とポリオレフィンの相溶化のため
に適宜添加してもよい。The above-mentioned polyolefin is dispersed in the heat and oil resistant resin to retain the lubricating oil. For example, polyethylene, polypropylene, poly-1-butene, poly-4-methyl-1-pentene, and copolymers thereof may be used alone or in combination of two or more. Also,
When these polyolefins are mixed with the heat and oil resistant resin and excellent mechanical properties are not exhibited simply by melt kneading, the polyolefin may be a graft modified polyolefin graft-modified with an appropriate functional group, Alternatively, a graft-modified polyolefin thereof or a suitable compatibilizing agent may be appropriately added for compatibilizing the base material and the polyolefin.
【００１３】本発明に係る転がり軸受に組み込まれる保
持器は、前記耐熱耐油性樹脂と前記ポリオレフィンとを
混合してなる樹脂組成物を成形母材とする。ここで、耐
熱耐油性樹脂とポリオレフィンとは、射出成形時におけ
る剪断速度下での溶融粘度の差が大きいほど、耐熱耐油
性樹脂中に分散されるポリオレフィンの縦横比が大きく
なり、吸油性能が向上する。この耐熱耐油性樹脂および
ポリオレフィン個々の溶融粘度の大きさは特に限定され
るものではなく、溶融粘度に差があればよく、またその
差は大きいほど好ましい。特に、射出成形時のポリオレ
フィンの溶融粘度が低いほど、射出成形品の表面をポリ
オレフィンが多く占有して、射出成形品の表面にポリオ
レフィンの特性が付与されるため、更に吸油性能が向上
する。The cage incorporated in the rolling bearing according to the present invention has a resin composition obtained by mixing the heat-resistant and oil-resistant resin and the polyolefin as a molding base material. Here, the heat- and oil-resistant resin and the polyolefin, the greater the difference in melt viscosity under shear rate during injection molding, the larger the aspect ratio of the polyolefin dispersed in the heat- and oil-resistant resin, the oil absorption performance is improved. To do. The magnitude of the melt viscosity of each of the heat and oil resistant resin and the polyolefin is not particularly limited and may be any difference in melt viscosity, and the larger the difference, the more preferable. In particular, the lower the melt viscosity of the polyolefin at the time of injection molding, the more the polyolefin occupies the surface of the injection molded product, and the properties of the polyolefin are imparted to the surface of the injection molded product, so that the oil absorption performance is further improved.
【００１４】また、耐熱耐油性樹脂とポリオレフィンと
は、好ましくは耐熱耐油性樹脂１００重量部に対してポ
リオレフィン５〜１００重量部の割当で混合される。こ
こで、ポリオレフィンの配合量が５重量部未満の場合に
は、保持器の吸油性が十分ではなく、一方ポリオレフィ
ンが１００重量部を越えて配合された場合には、保持器
としての耐熱性、機械的特性に劣るとともに、潤滑油に
含浸させた際に潤滑油によりポリオレフィンが膨潤して
寸法精度が著しく低下してしまうため好ましくない。The heat and oil resistant resin and the polyolefin are preferably mixed in an amount of 5 to 100 parts by weight of polyolefin with respect to 100 parts by weight of the heat and oil resistant resin. Here, when the amount of the polyolefin compounded is less than 5 parts by weight, the oil absorbency of the cage is not sufficient, while when the amount of the polyolefin compounded exceeds 100 parts by weight, heat resistance as a cage, It is not preferable because the mechanical properties are poor and the polyolefin swells due to the lubricating oil when impregnated with the lubricating oil, resulting in a marked decrease in dimensional accuracy.
【００１５】更に、耐熱耐油性樹脂およびポリオレフィ
ンからなる成形母材には、機械的強度の増強のために、
潤滑性能を低下させない程度に繊維状充填材を添加する
ことができる。例えばガラス繊維、炭素繊維、アラミド
繊維、チタン酸カリウム繊維、アルミナ繊維、窒化ケイ
素繊維、ステンレス繊維等を挙げることができるが、よ
り好適にはガラス繊維、炭素繊維、デュポン社製のケブ
ラー、ノーメックス、帝人（株）製のテクノーラ、コー
ネックスで代表される高耐熱性のアラミド繊維等を例示
できる。但し、これら繊維状充填材の配合量は、１５０
重量部を越えると溶融混練が難しくなり、良好な組成物
を得ることができなくなる。Furthermore, in order to enhance the mechanical strength, the molding base material composed of the heat and oil resistant resin and the polyolefin is
The fibrous filler can be added to such an extent that the lubricating performance is not deteriorated. Examples thereof include glass fiber, carbon fiber, aramid fiber, potassium titanate fiber, alumina fiber, silicon nitride fiber, and stainless fiber, but more preferably glass fiber, carbon fiber, Kevlar manufactured by DuPont, Nomex, Examples include technora manufactured by Teijin Ltd. and highly heat-resistant aramid fiber typified by Conex. However, the blending amount of these fibrous fillers is 150
If it exceeds the weight part, melt-kneading becomes difficult and a good composition cannot be obtained.
【００１６】前記成形母材には、更に適量の各種充填材
（剤）や各種安定剤を配合してもよい。例えば、有機充
填材、無機充填材、酸化防止剤、紫外線吸収剤、光保護
剤、耐熱安定剤、難燃剤、帯電防止剤、過酸化物分解
剤、流動性改良剤、非粘着性付与剤、離型剤、増核剤、
可塑剤、固体潤滑剤、顔料、染料等を配合することがで
きる。The molding base material may further contain appropriate amounts of various fillers (agents) and various stabilizers. For example, organic fillers, inorganic fillers, antioxidants, ultraviolet absorbers, light protectors, heat stabilizers, flame retardants, antistatic agents, peroxide decomposers, fluidity improvers, non-tackifiers, Release agent, nucleating agent,
Plasticizers, solid lubricants, pigments, dyes and the like can be added.
【００１７】これら樹脂組成物、並びに必要に応じて配
合される繊維状充填材や各種添加剤は、各々別々に溶融
混練することが可能であり、また予めこれらの材料をヘ
ンシェルミキサー、タンブラー、リボンミキサー等の混
合機で予備混合した後に溶融混練機へ供給する事もでき
る。溶融混練機としては単軸又は、二軸押出機、混合ロ
ール、加圧ニーダー、ブラベンダープラストグラフ等の
公知の溶融混練装置が使用できる。溶融混練する際の温
度は、繊維状充填材を除く各成分の溶融が十分進行し、
且つ分解しない温度を適宜選定すればよい。These resin compositions, as well as the fibrous fillers and various additives to be blended as necessary, can be melt-kneaded separately, and these materials can be preliminarily mixed with each other in a Henschel mixer, tumbler, ribbon. It is also possible to pre-mix with a mixer such as a mixer and then supply to a melt-kneader. As the melt-kneader, known melt-kneaders such as a single-screw or twin-screw extruder, a mixing roll, a pressure kneader and a Brabender plastograph can be used. The temperature at the time of melting and kneading is such that the melting of each component except the fibrous filler is sufficiently advanced
Moreover, the temperature at which decomposition does not occur may be appropriately selected.
【００１８】本発明に係る転がり軸受に組み込まれる保
持器は、前記耐熱耐油性樹脂および前記ポリオレフィン
からなる樹脂組成物、あるいは必要に応じて更に前記繊
維状充填材や各種添加剤を混合してなる成形母材を所望
の保持器形状に成形した後、該成形体を潤滑油中に浸漬
することにより完成される。成形方法は通常の射出成形
法であり、例えばインラインスクリュー式射出成形機を
用いて行うことができる。The cage incorporated in the rolling bearing according to the present invention comprises a resin composition comprising the heat and oil resistant resin and the polyolefin, or if necessary, the fibrous filler and various additives. After the molded base material is molded into a desired cage shape, the molded body is immersed in lubricating oil to complete the molding. The molding method is an ordinary injection molding method, and for example, an in-line screw type injection molding machine can be used.
【００１９】前記含浸用潤滑油は特に限定されないが、
パラフィン系鉱油、ナフテン系鉱油の他、炭化水素系
（ポリ−α−オレフィン、ポリブテン、アルキル芳香
族）、ポリアルキレングリコール、ジエステル、ヒンダ
ードエステル、ネオペンチルグリコールエステル、トリ
メチロールエステル、ペンタエリスリトールエステル、
ジペンタエリスリトールエステル、芳香族エステル、シ
リコーン系（シリコーンオイル、ケイ酸エステル）、フ
ッ素系（クロロフルオロカーボン、パーフルオロポリエ
ーテル、フルオロエステル）、フェニルエーテル、リン
酸エステル等の合成潤滑油が例示できるが、ポリオレフ
ィンに吸収されやすい鉱油、又は炭化水素系、脂肪酸エ
ステル、ポリアルキレングリコール、フェニルエーテ
ル、リン酸エステル系の合成潤滑油が好ましく、特にジ
エステル、ヒンダードエステル系の合成潤滑油及びエー
テル系の合成潤滑油が好ましい。The impregnating lubricating oil is not particularly limited,
In addition to paraffin-based mineral oil and naphthene-based mineral oil, hydrocarbon-based (poly-α-olefin, polybutene, alkyl aromatic), polyalkylene glycol, diester, hindered ester, neopentyl glycol ester, trimethylol ester, pentaerythritol ester,
Synthetic lubricating oils such as dipentaerythritol ester, aromatic ester, silicone type (silicone oil, silicic acid ester), fluorine type (chlorofluorocarbon, perfluoropolyether, fluoroester), phenyl ether, phosphoric acid ester, etc. can be exemplified. , Mineral oils that are easily absorbed by polyolefins, or hydrocarbon-based, fatty acid ester, polyalkylene glycol, phenyl ether, and phosphoric acid ester-based synthetic lubricating oils are preferable, and diester and hindered ester-based synthetic lubricating oils and ether-based synthetic oils are particularly preferable. Lubricating oils are preferred.
【００２０】これら含浸用潤滑油は、前記樹脂組成物を
成形してなる保持器１００重量部に０．１〜１５重量
％、更に好ましくは０．１〜１０重量％の範囲となるよ
うに含浸される。ここで、潤滑油の含浸量が０．１重量
％未満の場合は、絶対的に潤滑油の量が不足し、保持器
から転動体の転動部分に供給される潤滑油が早期に枯渇
し、軸受の耐久性を損なう。一方、潤滑油を１５重量％
を越えて含浸させても、軸受の潤滑性の向上を図れない
にもかかわらず、保持器の寸法精度の低下並びに機械的
特性の低下をきたすこととなる。しかも潤滑油の含浸に
伴う時間が長くなるため、生産効率が低下し保持器の価
格高騰の原因となる。These lubricating oils for impregnation are impregnated in an amount of 0.1 to 15% by weight, and more preferably 0.1 to 10% by weight, in 100 parts by weight of a retainer formed by molding the resin composition. To be done. Here, when the impregnated amount of the lubricating oil is less than 0.1% by weight, the amount of the lubricating oil is absolutely insufficient, and the lubricating oil supplied from the cage to the rolling parts of the rolling elements is depleted early. , Impair the durability of the bearing. On the other hand, 15% by weight of lubricating oil
Even if the impregnation exceeds the above range, the lubricity of the bearing cannot be improved, but the dimensional accuracy and mechanical properties of the cage will be deteriorated. In addition, since the time required for impregnating the lubricating oil becomes long, the production efficiency is lowered, which causes the price increase of the cage.
【００２１】前記含浸用潤滑油の粘度は特に限定されな
いが、４０℃での動粘度が１０〜１５０ｍｍ2 ／ｓが好
ましく、より好ましくは１０〜１３０ｍｍ2 ／ｓであ
る。この理由として４０℃での動粘度が１０ｍｍ2 ／ｓ
未満の低粘度の潤滑油は、保持器内部への浸透速度が速
く、保持器の含油量も大きくなるものの、保持器に含浸
させた潤滑油の保持性が悪く（早期に保持器から染み出
し）、早期に潤滑油が枯渇してしまう。反対に４０℃で
の動粘度が１５０ｍｍ2 ／ｓを超えるような高粘度の潤
滑油を使用した場合には、この潤滑油が保持器を構成す
るポリオレフィン中に含浸しずらくなるだけでなく、本
発明の保持器を組込んだ転がり軸受の回転トルクも大き
くなる。The viscosity of the impregnating lubricating oil is not particularly limited, but the kinematic viscosity at 40 ° C. is preferably 10 to 150 mm 2 / s, more preferably 10 to 130 mm 2 / s. The reason for this is that the kinematic viscosity at 40 ° C. is 10 mm 2 / s
A low-viscosity lubricating oil of less than less than has a high penetration speed into the cage and a large oil content in the cage, but retainability of the lubricating oil impregnated in the cage is poor (leaching from the cage early. ), The lubricating oil will be exhausted early. On the other hand, when a high-viscosity lubricating oil having a kinematic viscosity at 40 ° C. of more than 150 mm 2 / s is used, this lubricating oil is not only difficult to impregnate into the polyolefin constituting the cage, but also The rolling torque of the rolling bearing incorporating the retainer of the present invention also increases.
【００２２】前記含浸用潤滑油の保持器中の含浸量は、
耐熱耐油性樹脂の融点以下の温度で、含浸用潤滑油を加
温することにより、また浸漬時間を長くすることによっ
て多くなる。但し、潤滑油の液温が高過ぎると保持器が
熱変形をきたすため、潤滑油の液温を耐熱耐油性樹脂の
融点より概ね５０℃以上低く設定して、浸漬処理するこ
とが好ましい。また、前記含浸用潤滑油は、本発明の目
的を損なわない範囲で、必要に応じて酸化防止剤、防錆
剤、極圧剤、油性剤、粘度指数向上剤、摩耗防止剤等を
含んでいてもよい。The impregnated amount of the impregnating lubricating oil in the cage is
It is increased by heating the impregnating lubricating oil at a temperature equal to or lower than the melting point of the heat and oil resistant resin and by lengthening the immersion time. However, if the liquid temperature of the lubricating oil is too high, the cage will be thermally deformed. Therefore, it is preferable to set the liquid temperature of the lubricating oil lower than the melting point of the heat and oil resistant resin by about 50 ° C. or more and perform the immersion treatment. Further, the lubricating oil for impregnation contains an antioxidant, a rust preventive, an extreme pressure agent, an oiliness agent, a viscosity index improver, an antiwear agent, etc., if necessary, within a range that does not impair the object of the present invention. You may stay.
【００２３】本発明に係る転がり軸受は、上記の如く潤
滑油が含浸された保持器を軸受本体に組み込み、更にオ
イルプレーティングを施して完成される。このオイルプ
レーティングに使用される潤滑油は特に限定されず、前
記含浸用潤滑油と同一であっても、異なっていても良
く、含浸用潤滑油として列挙された前記潤滑油を少なく
とも１種類であれば良い。また、オイルプレーティング
に使用される潤滑油には、保持器に含浸用潤滑油と同様
に、酸化防止剤、防錆剤、極圧剤、油性剤、粘度指数向
上剤、摩耗防止剤等を含んでいてもよい。The rolling bearing according to the present invention is completed by incorporating the cage impregnated with the lubricating oil in the bearing main body as described above and further performing the oil plating. The lubricating oil used for this oil plating is not particularly limited, and may be the same as or different from the impregnating lubricating oil, and at least one of the lubricating oils listed as impregnating lubricating oils may be used. I wish I had it. The lubricating oil used for oil plating contains antioxidants, rust inhibitors, extreme pressure agents, oiliness agents, viscosity index improvers, anti-wear agents, etc., similar to the impregnating lubricant for cages. May be included.
【００２４】前記オイルプレーティングの適用方法は特
に限定されない。例えば、保持器を組み込んだ転がり
軸受を潤滑油を溶かし込んだ揮発性溶媒中に浸漬し、そ
の後引き上げ、揮発性溶媒を蒸発させる方法、前記揮
発性溶媒に代えて灯油等の揮発性の低い溶媒を使用し、
遠心脱油により付着量を調整しながら適用する方法、
潤滑油単独あるいは潤滑油を溶かし込んだ溶媒を、保持
器を組み込んだ転がり軸受に直接噴霧する方法等を適宜
選択して行うことができる。特に、前記およびの方
法が、潤滑油を転がり軸受の全面にわたり均一に、しか
も一定量付着させることができると共に、処理効率も高
いために好ましい。また、オイルプレーティングによる
潤滑油の付着量は、回転初期や低速回転時における潤滑
性の付与に寄与する量であれば特に限定されない。The method of applying the oil plating is not particularly limited. For example, a rolling bearing incorporating a retainer is immersed in a volatile solvent in which lubricating oil is dissolved, and then pulled up to evaporate the volatile solvent, a low-volatile solvent such as kerosene in place of the volatile solvent. Use
Method of applying while adjusting the adhesion amount by centrifugal deoiling,
A method in which the lubricating oil alone or a solvent in which the lubricating oil is dissolved is directly sprayed onto a rolling bearing incorporating a cage can be appropriately selected and performed. In particular, the above methods (1) and (2) are preferable because the lubricating oil can be uniformly and evenly deposited on the entire surface of the rolling bearing and the processing efficiency is high. Further, the amount of the lubricating oil adhered by the oil plating is not particularly limited as long as it is an amount that contributes to imparting lubricity at the initial stage of rotation or at low speed rotation.
【００２５】[0025]
【実施例】以下、本発明の効果を説明するために実施例
および比較例を示すが、本発明はこれらに限定されるも
のではない。EXAMPLES Examples and comparative examples will be shown below for explaining the effects of the present invention, but the present invention is not limited thereto.
【００２６】本発明の転がり軸受の効果を確認するた
め、潤滑油を含浸させた保持器を組み込んだ内径５ｍ
ｍ、外形１３ｍｍ、幅４ｍｍのミニアチュア玉軸受を用
いて回転試験を行った。尚、保持器の形状は、図１およ
び図２に示すような冠型保持器とした。試験条件は次の
通りである。 内輪回転数 ：３６００ｒ．ｐ．ｍ． スラスト荷重：２ｋｇｆ 雰囲気 ：８０℃，５％ＲＨIn order to confirm the effect of the rolling bearing of the present invention, an inner diameter of 5 m incorporating a cage impregnated with lubricating oil
A rotation test was carried out using a miniature ball bearing having m, outer diameter of 13 mm and width of 4 mm. The shape of the cage was a crown type cage as shown in FIGS. 1 and 2. The test conditions are as follows. Inner ring speed: 3600 r. p. m. Thrust load: 2kgf Atmosphere: 80 ° C, 5% RH
【００２７】また、評価方法は以下の通りである。 （ａ）音響寿命 音響寿命の評価は、軸受の音響特性の評価に一般的に使
用されているアンデロン値を用いた。アンデロン値に
は、高周波の数値（Ｈ．Ｂ．）、中周波の数値（Ｍ．
Ｂ．）、低周波の数値（Ｌ．Ｂ．）があるが、Ｌ．Ｂ．
は転がり軸受の性能にあまり影響しないため、本実施例
ではＨ．Ｂ．およびＭ．Ｂ．により音響寿命の評価を行
った。音響特性の判定は、保持器を組み込んで完成され
た前記ミニアチュア玉軸受のうち、初期値がＨ．Ｂ．、
Ｍ．Ｂ．共に１．０以下であることを確認したものを試
験軸受として用い、前記の試験条件下で５００時間毎に
アンデロン値を測定した。そして、Ｈ．Ｂ．、Ｍ．Ｂ．
の何れかが３．０以上となった時点で試験を中止し、そ
れまでの時間を音響耐久時間とした。 （ｂ）トルク トルクの測定は、図３に概略を示す軸受トルク測定装置
により行った。試験軸受２０を３６００ｒ．ｐ．ｍ．で
回転させ、ストレインゲージ２１を用いて測定したトル
ク値をレコーダに記録し、回転１０分後のトルクがほぼ
安定した時の値を採用した。尚、同図において、符号２
２はエアスピンドル、２３はアーバ、２４はアルミキャ
ップ、２５はエアベアリングである。トルクの合否判定
は、初期値が１．２ｇ・ｃｍ以下であり、試験終了時の
値が２．０ｇ・ｃｍ以下であれば合格とした。The evaluation method is as follows. (A) Acoustic Life The acoustic life was evaluated using the Anderon value that is generally used for evaluating the acoustic characteristics of bearings. The Anderon value has a high-frequency value (HB) and a medium-frequency value (M.
B. ), And low frequency numerical values (LB), but L. B.
Does not affect the performance of the rolling bearing so much, the H.V. B. And M.M. B. The acoustic life was evaluated by. For the determination of the acoustic characteristics, the initial value of the miniature ball bearing completed by incorporating the cage is H.264. B. ,
M. B. The bearings that were confirmed to be 1.0 or less were used as test bearings, and the Anderon value was measured every 500 hours under the test conditions described above. And H. B. , M .; B.
The test was stopped when any of the above became 3.0 or more, and the time until then was defined as the acoustic durability time. (B) Torque The torque was measured with a bearing torque measuring device schematically shown in FIG. The test bearing 20 was set to 3600r. p. m. The torque value measured using the strain gauge 21 was recorded on the recorder, and the value when the torque was substantially stable after 10 minutes of rotation was adopted. In the figure, reference numeral 2
2 is an air spindle, 23 is an arbor, 24 is an aluminum cap, and 25 is an air bearing. In the torque pass / fail judgment, if the initial value was 1.2 g · cm or less and the value at the end of the test was 2.0 g · cm or less, it was determined to be acceptable.
【００２８】○実施例１ ナイロン６６を７０重量％、低粘度高密度ポリエチレン
を２３重量％、無水マレイン酸グラフト変性ポリエチレ
ン７重量％を溶融混練した樹脂組成物を射出成形して得
た保持器に、その重量に対して４．８重量％のポリ−α
−オレフィン系合成潤滑油（４０℃の動粘度が４６ｍｍ
2 ／ｓ）を含浸させた後、前記玉軸受に組み込み、更に
オイルプレーティング用の潤滑油〔ポリ−α−オレフィ
ン系合成潤滑油（４０℃の動粘度が４６ｍｍ2 ／ｓ）〕
を３重量％の割合で溶かし込んだ揮発性溶媒に浸漬し、
その後引き上げて揮発性溶媒を蒸発させ、全体として前
記潤滑油を３ｍｇ付着させて試験軸受を完成した。そし
て、この試験軸受の音響寿命およびトルクを前記の測定
条件で測定した。測定結果を第１表に示す。Example 1 A cage obtained by injection-molding a resin composition obtained by melt-kneading 70% by weight of nylon 66, 23% by weight of low-viscosity and high-density polyethylene, and 7% by weight of maleic anhydride graft modified polyethylene. , 4.8% by weight of its weight of poly-alpha
-Olefin synthetic lubricating oil (Kinematic viscosity at 40 ° C is 46mm
2 / s) and then incorporated into the ball bearing, and further used as a lubricating oil for oil plating [poly-α-olefin-based synthetic lubricating oil (kinematic viscosity at 40 ° C. is 46 mm 2 / s)]
Is immersed in a volatile solvent containing 3% by weight of
Then, the test bearing was completed by pulling it up to evaporate the volatile solvent and depositing 3 mg of the lubricating oil as a whole. Then, the acoustic life and torque of this test bearing were measured under the above measurement conditions. The measurement results are shown in Table 1.
【００２９】○実施例２ 実施例１と同様に作成した保持器に、その重量に対して
０．２５重量％のジ−２−エチルヘキシルセバケート系
合成潤滑油（４０℃の動粘度が１２ｍｍ2 ／ｓ）を含浸
させた後、前記玉軸受に組み込み、更に実施例１と同様
の方法でオイルプレーティング用の潤滑油〔ジ−２−エ
チルヘキシルセバケート系合成潤滑油（４０℃の動粘度
が１２ｍｍ2 ／ｓ）〕を全体として３ｍｇ付着させて試
験軸受を完成した。そして、この試験軸受の音響寿命お
よびトルクを前記の測定条件で測定した。測定結果を第
１表に示す。Example 2 A cage prepared in the same manner as in Example 1 was charged with 0.25% by weight of di-2-ethylhexyl sebacate-based synthetic lubricating oil (having a kinematic viscosity of 12 mm 2 at 40 ° C.). / S) and then incorporated into the ball bearing, and in the same manner as in Example 1, a lubricating oil for oil plating [di-2-ethylhexyl sebacate-based synthetic lubricating oil (having a kinematic viscosity of 40 ° C. 12 mm 2 / s)] as a whole and 3 mg were adhered to complete a test bearing. Then, the acoustic life and torque of this test bearing were measured under the above measurement conditions. The measurement results are shown in Table 1.
【００３０】○実施例３ 実施例１と同様に作成した保持器に、その重量に対して
０．５８重量％のジ−２−エチルヘキシルセバケート系
合成潤滑油（４０℃の動粘度が１２ｍｍ2 ／ｓ）を含浸
させた後、前記玉軸受に組み込み、更に実施例１と同様
の方法でオイルプレーティング用の潤滑油〔ジ−２−エ
チルヘキシルセバケート系合成潤滑油（４０℃の動粘度
が１２ｍｍ2 ／ｓ）〕を全体として３ｍｇ付着させて試
験軸受を完成した。そして、この試験軸受の音響寿命お
よびトルクを前記の測定条件で測定した。測定結果を第
１表に示す。Example 3 A cage prepared in the same manner as in Example 1 was charged with 0.58 wt% of di-2-ethylhexyl sebacate-based synthetic lubricating oil (having a kinematic viscosity of 12 mm 2 at 40 ° C.). / S) and then incorporated into the ball bearing, and in the same manner as in Example 1, a lubricating oil for oil plating [di-2-ethylhexyl sebacate-based synthetic lubricating oil (having a kinematic viscosity of 40 ° C. 12 mm 2 / s)] as a whole and 3 mg were adhered to complete a test bearing. Then, the acoustic life and torque of this test bearing were measured under the above measurement conditions. The measurement results are shown in Table 1.
【００３１】○実施例４ 実施例１と同様に作成した保持器に、その重量に対して
１．２０重量％のジ−２−エチルヘキシルセバケート系
合成潤滑油（４０℃の動粘度が１２ｍｍ2 ／ｓ）を含浸
させた後、前記玉軸受に組み込み、更に実施例１と同様
の方法でオイルプレーティング用の潤滑油〔ジ−２−エ
チルヘキシルセバケート系合成潤滑油（４０℃の動粘度
が１２ｍｍ2 ／ｓ）〕を全体として２ｍｇ付着させて試
験軸受を完成した。そして、この試験軸受の音響寿命お
よびトルクを前記の測定条件で測定した。測定結果を第
１表に示す。Example 4 A cage prepared in the same manner as in Example 1 was charged with 1.20% by weight of its weight of a di-2-ethylhexyl sebacate-based synthetic lubricating oil (kinematic viscosity at 40 ° C. was 12 mm 2 / S) and then incorporated into the ball bearing, and in the same manner as in Example 1, a lubricating oil for oil plating [di-2-ethylhexyl sebacate-based synthetic lubricating oil (having a kinematic viscosity of 40 ° C. 12 mm 2 / s)] as a whole and 2 mg were deposited to complete a test bearing. Then, the acoustic life and torque of this test bearing were measured under the above measurement conditions. The measurement results are shown in Table 1.
【００３２】○実施例５ 実施例１と同様に作成した保持器に、その重量に対して
４．６０重量％のジ−２−エチルヘキシルセバケート系
合成潤滑油（４０℃の動粘度が１２ｍｍ2 ／ｓ）を含浸
させた後、前記玉軸受に組み込み、更に実施例１と同様
の方法でオイルプレーティング用の潤滑油〔ジ−２−エ
チルヘキシルセバケート系合成潤滑油（４０℃の動粘度
が１２ｍｍ2 ／ｓ）〕を全体として３ｍｇ付着させて試
験軸受を完成した。そして、この試験軸受の音響寿命お
よびトルクを前記の測定条件で測定した。測定結果を第
１表に示す。Example 5 A cage prepared in the same manner as in Example 1 was added to a cage having a weight of 4.60% by weight based on the weight of di-2-ethylhexyl sebacate-based synthetic lubricating oil (kinematic viscosity at 40 ° C. was 12 mm 2 / S) and then incorporated into the ball bearing, and in the same manner as in Example 1, a lubricating oil for oil plating [di-2-ethylhexyl sebacate-based synthetic lubricating oil (having a kinematic viscosity of 40 ° C. 12 mm 2 / s)] as a whole and 3 mg were adhered to complete a test bearing. Then, the acoustic life and torque of this test bearing were measured under the above measurement conditions. The measurement results are shown in Table 1.
【００３３】○実施例６ 実施例１と同様に作成した保持器に、その重量に対して
６．２０重量％の（ジ）アルキルジフェニルエーテル系
合成潤滑油（４０℃の動粘度が２２ｍｍ2 ／ｓ）を含浸
させた後、前記玉軸受に組み込み、更に実施例１と同様
の方法でオイルプレーティング用の潤滑油〔（ジ）アル
キルジフェニルエーテル系合成潤滑油（４０℃の動粘度
が２２ｍｍ2 ／ｓ）〕を全体として２ｍｇ付着させて試
験軸受を完成した。そして、この試験軸受の音響寿命お
よびトルクを前記の測定条件で測定した。測定結果を第
１表に示す。Example 6 A cage manufactured in the same manner as in Example 1 was charged with 6.20% by weight based on the weight of the (di) alkyldiphenylether-based synthetic lubricating oil (kinematic viscosity at 40 ° C. was 22 mm 2 / s). ) Is incorporated into the ball bearing, and a lubricating oil for oil plating [(di) alkyldiphenyl ether-based synthetic lubricating oil (having a kinematic viscosity at 40 ° C. of 22 mm 2 / s) is used in the same manner as in Example 1. )] Was deposited as a whole to complete the test bearing. Then, the acoustic life and torque of this test bearing were measured under the above measurement conditions. The measurement results are shown in Table 1.
【００３４】○比較例１ 実施例１と同様に作成した保持器に、その重量に対して
０．０７重量％のジ−２−エチルヘキシルセバケート系
合成潤滑油（４０℃の動粘度が１２ｍｍ2 ／ｓ）を含浸
させた後、前記玉軸受に組み込み、更に実施例１と同様
の方法でオイルプレーティング用の潤滑油〔ジ−２−エ
チルヘキシルセバケート系合成潤滑油（４０℃の動粘度
が１２ｍｍ2 ／ｓ）〕を全体として５ｍｇ付着させて試
験軸受を完成した。そして、この試験軸受の音響寿命お
よびトルクを前記の測定条件で測定した。測定結果を第
１表に示す。Comparative Example 1 A cage prepared in the same manner as in Example 1 was charged with 0.07 wt% of di-2-ethylhexyl sebacate-based synthetic lubricating oil (having a kinematic viscosity of 12 mm 2 at 40 ° C.). / S) and then incorporated into the ball bearing, and in the same manner as in Example 1, a lubricating oil for oil plating [di-2-ethylhexyl sebacate-based synthetic lubricating oil (having a kinematic viscosity of 40 ° C. 12 mm 2 / s)] was deposited as a whole to complete the test bearing. Then, the acoustic life and torque of this test bearing were measured under the above measurement conditions. The measurement results are shown in Table 1.
【００３５】○比較例２ 実施例１と同様に作成した保持器に、その重量に対して
４．６０重量％のジ−２−エチルヘキシルセパケート系
合成潤滑油（４０℃の動粘度が１２ｍｍ2 ／ｓ）を含浸
させた後、前記玉軸受に組み込み試験軸受を完成した。
そして、この試験軸受の音響寿命およびトルクを前記の
測定条件で測定した。測定結果を第１表に示す。Comparative Example 2 A cage prepared in the same manner as in Example 1 was charged with 4.60% by weight based on the weight of a di-2-ethylhexylsepacate-based synthetic lubricating oil (having a kinematic viscosity at 40 ° C. of 12 mm 2 / S) and then incorporated into the ball bearing to complete a test bearing.
Then, the acoustic life and torque of this test bearing were measured under the above measurement conditions. The measurement results are shown in Table 1.
【００３６】○比較例３ ナイロン６６を射出成形した保持器を、潤滑油を含浸さ
せることなく前記玉軸受に組み込み試験軸受を完成し
た。そして、この試験軸受の音響寿命およびトルクを前
記の測定条件で測定した。測定結果を第１表に示す。Comparative Example 3 A cage made by injection molding nylon 66 was incorporated into the ball bearing without impregnating the lubricating oil to complete a test bearing. Then, the acoustic life and torque of this test bearing were measured under the above measurement conditions. The measurement results are shown in Table 1.
【００３７】○比較例４ ナイロン６６を射出成形した保持器を、リチウム石鹸グ
リース１５ｍｇを充填した前記玉軸受に組み込み試験軸
受を完成した。そして、この試験軸受の音響寿命および
トルクを前記の測定条件で測定した。測定結果を第１表
に示す。Comparative Example 4 A cage made by injection molding nylon 66 was assembled into the ball bearing filled with 15 mg of lithium soap grease to complete a test bearing. Then, the acoustic life and torque of this test bearing were measured under the above measurement conditions. The measurement results are shown in Table 1.
【００３８】○比較例５ ナイロン６６を９０重量％、ガラス繊維を１０重量％の
割合で溶融混練した樹脂組成物を射出成形して得た保持
器に、その重量に対して０．４重量％のジ−２−エチル
ヘキシルセバケート系合成潤滑油（４０℃の動粘度が１
２ｍｍ2 ／ｓ）を含浸させた後、前記玉軸受に組み込
み、更にオイルプレーティング用の潤滑油〔ジ−２−エ
チルヘキシルセバケート系合成潤滑油（４０℃の動粘度
が１２ｍｍ2 ／ｓ）〕を３重量％の割合で溶かし込んだ
揮発性溶媒に浸漬し、その後引き上げて揮発性溶媒を蒸
発させ、全体として前記潤滑油を３ｍｇ付着させて試験
軸受を完成した。そして、この試験軸受の音響寿命およ
びトルクを前記の測定条件で測定した。測定結果を第１
表に示す。Comparative Example 5 A cage obtained by injection molding a resin composition obtained by melt-kneading 90% by weight of nylon 66 and 10% by weight of glass fiber into a cage, and 0.4% by weight based on the weight thereof. Di-2-ethylhexyl sebacate synthetic lubricating oil (Kinematic viscosity at 40 ° C is 1
2 mm 2 / s) and then incorporated into the ball bearing, and further used as a lubricating oil for oil plating [di-2-ethylhexyl sebacate-based synthetic lubricating oil (kinematic viscosity at 40 ° C. is 12 mm 2 / s)] Was immersed in a volatile solvent dissolved at a ratio of 3% by weight and then pulled up to evaporate the volatile solvent, and 3 mg of the lubricating oil was adhered as a whole to complete a test bearing. Then, the acoustic life and torque of this test bearing were measured under the above measurement conditions. First measurement result
Shown in the table.
【００３９】[0039]
【表１】 [Table 1]
【００４０】第１表に記したデータが示すように、本実
施例１〜６の玉軸受は、保持器の潤滑油の保持能力に優
れるため、この保持器を組み込んだ玉軸受はグリースを
用いなくとも長期間にわたり保持器が潤滑油を供給し、
良好に潤滑され、高温下における潤滑性が大幅に改善さ
れた。しかも、軸受全体にオイルプレーティングを施し
ているため、軸受の回転初期からトルク並びに音響特性
が良好となった。また、軸受にグリースを充填していな
いために、グリースの攪拌に起因するトルク上昇がな
い。As shown in the data shown in Table 1, the ball bearings of Examples 1 to 6 are excellent in the ability of the cage to retain the lubricating oil. Therefore, the ball bearing incorporating this cage uses grease. The cage supplies lubricating oil for a long time,
It was well lubricated and the lubricity at high temperature was greatly improved. In addition, since the entire bearing is oil-plated, the torque and acoustic characteristics were good from the beginning of rotation of the bearing. Further, since the bearing is not filled with grease, there is no increase in torque due to stirring of the grease.
【００４１】更に、上記実施例および比較例において、
オイルプレーティング用潤滑油には、リン酸トリクレジ
ル４重量％およびカルシウムスルホネート６重量％を配
合して防錆性を付与してある。この防錆性の評価のため
に、各試験軸受を温度６０℃、相対湿度９０％の大気中
に７日間放置し、７日間経過後に表面に錆が発生してい
るか否かを目視により観察し、錆の発生が確認されない
場合を合格とした。尚、本試験に使用したミニアチュア
玉軸受を構成する外輪、内輪および転動体は予め完全脱
脂したものを使用した。試験結果を第１表に併記する。
試験結果から、実施例１〜６の玉軸受は、苛酷な温度、
湿度下においても防錆性に優れていることが判る。Furthermore, in the above Examples and Comparative Examples,
The lubricating oil for oil plating is mixed with 4% by weight of tricresyl phosphate and 6% by weight of calcium sulfonate to impart anticorrosive properties. In order to evaluate the rust-preventive property, each test bearing was left in the atmosphere at a temperature of 60 ° C. and a relative humidity of 90% for 7 days, and after 7 days, it was visually observed whether rust was generated on the surface. The case where no rust was confirmed was accepted. The outer ring, the inner ring, and the rolling elements constituting the miniature ball bearing used in this test were completely degreased in advance. The test results are also shown in Table 1.
From the test results, the ball bearings of Examples 1 to 6 were
It can be seen that the anticorrosive property is excellent even under humidity.
【００４２】[0042]
【発明の効果】以上説明したように、本発明の転がり軸
受用保持器を組込んだ軸受は、耐熱耐油性樹脂とポリオ
レフィンとからなる樹脂組成物を軸受用保持器の形状に
成形した成形体を潤滑油中で浸漬処理することによっ
て、保持器には一定量の潤滑油が含浸される。ここで、
保持器となる前記樹脂組成物が潤滑油と親和性の高いポ
リオレフィンを含むことにより、保持器中の潤滑油の含
有量が多くなるとともに、潤滑油の保持力も大きくな
り、もって潤滑油が長期間安定して転動体の転動部分に
供給される。そのため、この保持器を組込んだ転がり軸
受は回転に要するトルクが低減すると共に、このトルク
の変動が小さくなる。しかも、樹脂組成物の母材となる
耐熱耐油性樹脂とポリオレフィンとは、射出成形時にお
ける剪断速度下での溶融粘度が異なり、この粘度差によ
り耐熱耐油性樹脂中に分散するポリオレフィンの縦横比
が大きくなり吸油性能が向上する。特に、射出成形時の
ポリオレフィンの溶融粘度が耐熱耐油性樹脂の溶融粘度
より低いほど、射出成形品の表面をポリオレフィンが多
く占有し、表面にポリオレフィンの特性が付与されるた
め、更に吸油性能が向上する。また、保持器の機械的強
度に関しても、保持器形状に成形した後に、潤滑油中に
浸漬するために、成形時におけるウエルドラインの発生
もなく、機械的強度に優れる。更に、前記保持器を組み
込んだ転がり軸受にオイルプレーティングを施すことに
より、転がり軸受の全露出面に一定量の潤滑油が均一に
付着される。従って、回転初期や低速回転時のように、
前記保持器からの潤滑油の滲み出しが充分でない場合で
も、表面に付着した潤滑油により潤滑性が付与される。
また、オイルプレーティング用の潤滑油に他の特性付与
剤を添加することにより、潤滑性に加えて他の特性を付
与できる。例えば、オイルプレーティング用潤滑油に防
錆剤を添加することにより、特に高温度で使用される転
がり軸受に多く見られる、錆の発生を抑制することがで
きる。As described above, the bearing incorporating the cage for rolling bearings of the present invention is a molded product obtained by molding a resin composition comprising a heat and oil resistant resin and polyolefin into the shape of the cage for bearings. The cage is impregnated with a certain amount of lubricating oil by immersing the cage in the lubricating oil. here,
Since the resin composition to be the cage contains a polyolefin having a high affinity for the lubricating oil, the content of the lubricating oil in the cage is increased and the retaining force of the lubricating oil is also increased, so that the lubricating oil can be used for a long period of time. It is stably supplied to the rolling part of the rolling element. Therefore, the rolling bearing incorporating this retainer reduces the torque required for rotation and reduces the fluctuation of this torque. Moreover, the heat- and oil-resistant resin that is the base material of the resin composition and the polyolefin have different melt viscosities under shear rate during injection molding, and the aspect ratio of the polyolefin dispersed in the heat- and oil-resistant resin is different due to this viscosity difference. It becomes larger and the oil absorption performance improves. In particular, as the melt viscosity of the polyolefin during injection molding is lower than that of the heat- and oil-resistant resin, the surface of the injection-molded product is occupied by the polyolefin more, and the characteristics of the polyolefin are given to the surface, further improving the oil absorption performance. To do. Also, regarding the mechanical strength of the cage, since the cage is shaped into a cage shape and then immersed in lubricating oil, no weld line is formed during molding and the mechanical strength is excellent. Further, by applying oil plating to the rolling bearing in which the cage is incorporated, a fixed amount of lubricating oil is uniformly attached to the entire exposed surface of the rolling bearing. Therefore, as in the initial rotation and low speed rotation,
Even if the lubricating oil does not sufficiently exude from the cage, the lubricating oil attached to the surface provides lubricity.
Further, by adding another property imparting agent to the lubricating oil for oil plating, it is possible to impart other properties in addition to the lubricity. For example, by adding a rust preventive agent to the lubricating oil for oil plating, it is possible to suppress the occurrence of rust, which is often found in rolling bearings used particularly at high temperatures.
【図１】転がり軸受を示す要部断面図である。FIG. 1 is a cross-sectional view of essential parts showing a rolling bearing.
【図２】図１に示される転がり軸受の保持器を示す斜視
図である。FIG. 2 is a perspective view showing a cage of the rolling bearing shown in FIG.
【図３】軸受トルク測定装置を示す概略図である。FIG. 3 is a schematic view showing a bearing torque measuring device.
１ 内輪軌道 ２ 内輪 ３ 外輪軌道 ４ 外輪 ５ 転動体 ６ シール板 ７ 保持器 ８ 主部 ９ 保持部 １０ 弾性片 ２０ 試験軸受 ２１ ストレインゲージ ２２ エアスピンドル ２３ アーバ ２４ アルミキャップ ２５ エアベアリング 1 Inner ring raceway 2 Inner ring 3 Outer ring raceway 4 Outer ring 5 Rolling element 6 Seal plate 7 Cage 8 Main part 9 Holding part 10 Elastic piece 20 Test bearing 21 Strain gauge 22 Air spindle 23 Arbor 24 Aluminum cap 25 Air bearing
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山本 雅雄 神奈川県藤沢市鵠沼神明一丁目５番50号 日本精工株式会社内 (72)発明者 白石 恵美子 神奈川県藤沢市鵠沼神明一丁目５番50号 日本精工株式会社内 (72)発明者 横内 敦 神奈川県藤沢市鵠沼神明一丁目５番50号 日本精工株式会社内 (72)発明者 中 道治 神奈川県藤沢市鵠沼神明一丁目５番50号 日本精工株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masao Yamamoto 1-5-50 Shinmei Kugenuma, Fujisawa-shi, Kanagawa Nippon Seiko Co., Ltd. (72) Emiko Shiraishi 1-5-50 Shinmei Kugenuma, Fujisawa, Kanagawa Prefecture (72) Inventor Atsushi Yokouchi 1-5-50 Kumei, Kugenuma, Fujisawa-shi, Kanagawa Nippon Seiko Co., Ltd. (72) Inventor, Michiharu Naka, 1-5-50, Kumei, Kugenuma, Fujisawa, Kanagawa Japan Seiko Co., Ltd.
Claims (1)
オレフィンとからなる樹脂組成物を所望の保持器形状に
成形してなる成形体を潤滑油中に浸漬して得られた保持
器を組み込み、且つオイルプレーティングを施したこと
を特徴とする転がり軸受。1. A cage obtained by immersing a molded article obtained by molding a resin composition comprising a resin having heat resistance and oil resistance and a polyolefin into a desired cage shape in a lubricating oil, A rolling bearing characterized by being oil-plated.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02456795A JP3503662B2 (en) | 1995-01-20 | 1995-01-20 | Rolling bearing |
| US08/499,375 US5575570A (en) | 1994-07-08 | 1995-07-07 | Cage for rolling bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02456795A JP3503662B2 (en) | 1995-01-20 | 1995-01-20 | Rolling bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08200372A true JPH08200372A (en) | 1996-08-06 |
| JP3503662B2 JP3503662B2 (en) | 2004-03-08 |
Family
ID=12141741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02456795A Expired - Fee Related JP3503662B2 (en) | 1994-07-08 | 1995-01-20 | Rolling bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3503662B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005060473A (en) * | 2003-08-08 | 2005-03-10 | Nsk Ltd | Method for modifying plastic molded article and plastic molded article |
| US7234872B2 (en) | 1997-06-06 | 2007-06-26 | Nsk, Ltd. | Rolling Bearing |
| JP2010280889A (en) * | 2010-07-08 | 2010-12-16 | Nsk Ltd | Method for modifying plastic molded article and plastic molded article |
-
1995
- 1995-01-20 JP JP02456795A patent/JP3503662B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7234872B2 (en) | 1997-06-06 | 2007-06-26 | Nsk, Ltd. | Rolling Bearing |
| JP2005060473A (en) * | 2003-08-08 | 2005-03-10 | Nsk Ltd | Method for modifying plastic molded article and plastic molded article |
| JP4631256B2 (en) * | 2003-08-08 | 2011-02-16 | 日本精工株式会社 | Method for modifying plastic molded product and plastic molded product |
| JP2010280889A (en) * | 2010-07-08 | 2010-12-16 | Nsk Ltd | Method for modifying plastic molded article and plastic molded article |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3503662B2 (en) | 2004-03-08 |
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