JPH1068420A - Wear resistant resin composition, and cage for bearing - Google Patents

Wear resistant resin composition, and cage for bearing

Info

Publication number
JPH1068420A
JPH1068420A JP8226957A JP22695796A JPH1068420A JP H1068420 A JPH1068420 A JP H1068420A JP 8226957 A JP8226957 A JP 8226957A JP 22695796 A JP22695796 A JP 22695796A JP H1068420 A JPH1068420 A JP H1068420A
Authority
JP
Japan
Prior art keywords
resin
bearing
resin composition
weight
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
JP8226957A
Other languages
Japanese (ja)
Inventor
Yoshiki Ono
芳規 小野
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.)
Nakanishi Metal Works Co Ltd
Original Assignee
Nakanishi Metal Works 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 Nakanishi Metal Works Co Ltd filed Critical Nakanishi Metal Works Co Ltd
Priority to JP8226957A priority Critical patent/JPH1068420A/en
Publication of JPH1068420A publication Critical patent/JPH1068420A/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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/44—Selection of substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/41—Ball cages comb-shaped
    • F16C33/412—Massive or moulded comb cages, e.g. snap ball cages
    • F16C33/414—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages
    • F16C33/416—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages made from plastic, e.g. injection moulded comb cages
    • 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
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • F16C2208/60—Polyamides [PA]

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To improve the sliding property while excellent fluidity is secured by providing the wear resistant resin composition to be used in forming a cage for bearing with a base material made of the resin to be selected from among polyamide resin and polyacetal resin and with a reinforcement in which Aramid fiber of the prescribed quantity. SOLUTION: The resin to be selected from among polyamide resin and polyacetal resin as the base material, and the reinforcement in which 1-30wt.% Aramid fiber is blended are the resin composition to be used for a cage for bearing in a roller bearing of the inner diameter of about 5mm. Polyethylene of an ultra-high polymer of 5-30wt.% is blended as the filler for improving the sliding property. Alternatively, as the filler for improving the sliding property, 5-30wt.% micro-spherical phenol resin is blended. The Aramid fiber as the reinforcement of 10-15μm, preferably <=12μm in fiber diameter, and 0.5-3.5mm in length, preferably >=0.7mm in lower limit to <=1.5mm in upper limit, is used.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】この発明は、摺動特性に優れ
た耐摩耗性樹脂組成物、及びその材料からなる軸受用保
持器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wear-resistant resin composition having excellent sliding characteristics and a bearing retainer made of the same.

【０００２】[0002]

【従来の技術】ハードディスクドライブ（ＨＤＤ）やビ
デオテープレコーダ（ＶＴＲ）等の磁気記憶装置に使用
される軸受として、ミニチュア軸受等と称される内径約
５ｍｍ程度の極小径の転がり軸受が用いられており、そ
の極小径軸受においては、例えば図１及び図２に示すよ
うに、内輪（１）及び外輪（２）間のボール（３）を保
持するための保持器（４）として冠型のものが主として
使用されている。従来、このような軸受用保持器（４）
としては、軽量で、形状の自由度も大きい合成樹脂製の
ものが一般に使用されている。2. Description of the Related Art As a bearing used for a magnetic storage device such as a hard disk drive (HDD) or a video tape recorder (VTR), a rolling bearing having an extremely small diameter of about 5 mm in inside diameter called a miniature bearing or the like is used. In such an ultra-small diameter bearing, for example, as shown in FIGS. 1 and 2, a crown type retainer (4) for retaining a ball (3) between an inner ring (1) and an outer ring (2). Are mainly used. Conventionally, such a cage for a bearing (4)
Generally, those made of a synthetic resin which is lightweight and has a large degree of freedom in shape are generally used.

【０００３】一方、上記の極小径軸受が用いられるＨＤ
Ｄ等は、小型化、高性能化が進み、その技術進歩に合わ
せて、軸受に対しても小型化、高性能化が強く要求され
ている。例えば内外両輪（１）（２）の開放部を閉塞す
るための軸受用シール（５）として、従前は、金属の単
板からなる金属シールや、合成樹脂単独の成形品からな
る樹脂シールが採用されていたが、これらのシールでは
十分な密封性が得られずグリース漏れ等の不具合が発生
するため、近年では、芯金に合成ゴムが被覆されたゴム
被覆タイプのシールを採用する傾向が高くなっている。On the other hand, an HD using the above-described ultra-small diameter bearing is used.
For D and the like, miniaturization and high performance have been advanced, and along with the technological progress, miniaturization and high performance of bearings have been strongly demanded. For example, as a bearing seal (5) for closing the open portions of the inner and outer wheels (1) and (2), a metal seal made of a single metal plate or a resin seal made of a synthetic resin alone is conventionally used. However, these seals do not provide sufficient sealing properties and cause problems such as grease leakage.In recent years, there has been a high tendency to adopt rubber-coated seals in which core metal is coated with synthetic rubber. Has become.

【０００４】ところが、ゴム被覆タイプのシール（５）
は、金属シールや樹脂シール等と比べて、軸芯方向の厚
さが厚くなるので、保持器（４）との干渉を避けるため
に、保持器（４）の底部（４ａ）を薄く形成する必要が
ある。加えて、軸受小型化の要求に対処するのに、保持
器（４）の底部（４ａ）を、一段と薄く形成する必要が
あり、例えば底部（４ａ）の最小肉厚を０．２〜０．４
ｍｍ程度にまで抑える必要がある他、爪部（４ａ）の薄
肉化も更に進める必要がある。However, rubber-coated seals (5)
Is thicker in the axial direction than a metal seal, a resin seal, or the like, so that the bottom portion (4a) of the retainer (4) is formed thin to avoid interference with the retainer (4). There is a need. In addition, in order to cope with the demand for downsizing of the bearing, it is necessary to make the bottom (4a) of the retainer (4) thinner. For example, the minimum thickness of the bottom (4a) is set to 0.2 to 0. 4
mm, and the nail (4a) needs to be further thinned.

【０００５】また保持器（４）は、周辺部品とすべり接
触するため、優れた摺動特性（耐摩耗性）が要求され、
その上更に、安定した球保持状態を維持するためや、十
分な耐久性を得るために、適度な強度も必要となってく
る。The cage (4) is required to have excellent sliding characteristics (wear resistance) because it comes into sliding contact with peripheral parts.
Furthermore, appropriate strength is required to maintain a stable ball holding state and to obtain sufficient durability.

【０００６】[0006]

【発明が解決しようとする課題】このような状況下にお
いて、従来、極小径軸受用の保持器（４）を得る方法と
して、例えば成形性、耐油性、耐熱性等に優れたナイロ
ン等のポリアミド樹脂を母材とし、強化材としてガラス
繊維やカーボン繊維が配合された成形材料を射出成形す
ることにより得る方法が採用される場合がある。Under such circumstances, conventionally, a method for obtaining a cage (4) for an ultra-small-diameter bearing includes, for example, polyamide such as nylon having excellent moldability, oil resistance, heat resistance and the like. In some cases, a method in which a resin is used as a base material and injection molding is performed on a molding material in which glass fiber or carbon fiber is blended as a reinforcing material is used.

【０００７】しかしながら、強化材としてガラス繊維や
カーボン繊維が配合された成形材料は、流動性が不十分
であり、今以上小型化の保持器を形成するとなると、射
出成形時に、金型のキャビィティ内、特に保持器（４）
の底部（４ａ）や爪部（４ｂ）に対応する部分の極小径
キャビィティ内に、成形材料が十分に流れ込まず、成形
不良が生じるという問題が発生する。However, a molding material containing glass fiber or carbon fiber as a reinforcing material is insufficient in fluidity, and if a smaller cage is to be formed, the cavity in the mold during injection molding will be insufficient. , Especially cage (4)
There is a problem that the molding material does not sufficiently flow into the extremely small-diameter cavities corresponding to the bottom portion (4a) and the claw portion (4b), resulting in molding defects.

【０００８】もちろん、ガラス繊維等の強化材の配合量
を少なくすることにより、成形時に良好な流動性を得る
ことは可能であるが、そうすると強化材不足のため、十
分な強度を得ることができず、軸受組付状態において使
用時に遠心力による変形等が生じたり、あるいは十分な
耐久性が得られない等の問題が発生する。[0008] Of course, it is possible to obtain good fluidity at the time of molding by reducing the amount of reinforcing material such as glass fiber, but then sufficient strength can be obtained due to lack of reinforcing material. However, there are problems such as deformation due to centrifugal force at the time of use in a state where the bearing is assembled, or sufficient durability cannot be obtained.

【０００９】一方、軸受用保持器（４）は、隣接部品と
の滑り接触を良好に行うために、通常、潤滑油等のグリ
ースを使用しているが、グリース流出による周辺部品の
劣化を防止するには、グリースの使用量を可及的に少な
く抑える必要がある。つまり保持器（４）として、極少
量のグリースでスムーズに滑り摩擦するように、高摺動
特性を有するものを開発することが望まれている。On the other hand, the bearing retainer (4) normally uses grease such as lubricating oil in order to make good sliding contact with adjacent parts, but prevents deterioration of peripheral parts due to grease leakage. To do so, it is necessary to reduce the amount of grease used as much as possible. That is, it is desired to develop a cage (4) having a high sliding property so that sliding friction can be smoothly performed with a very small amount of grease.

【００１０】この発明は、上記従来技術の問題を解消
し、良好な流動性及び成形性を確保しつつ、摺動特性及
び強度の向上を図ることができる耐摩耗性樹脂組成物を
提供すること、更にその樹脂組成物の使用により、ミニ
チュア軸受等の極小径軸受に最適な軸受用保持器を提供
することを目的とする。[0010] The present invention is to provide a wear-resistant resin composition which can solve the above-mentioned problems of the prior art, and can improve sliding characteristics and strength while ensuring good fluidity and moldability. Further, it is another object of the present invention to provide a bearing retainer which is optimal for an ultra-small diameter bearing such as a miniature bearing by using the resin composition.

【００１１】[0011]

【課題を解決するための手段】本発明者は、鋭意検討を
行った結果、特定の樹脂を母材とし、特定の繊維を強化
材として配合した樹脂組成物が、上記目的を達成し得る
ものであることを見出だし、本発明をなすに至った。Means for Solving the Problems As a result of intensive studies, the present inventors have found that a resin composition containing a specific resin as a base material and a specific fiber as a reinforcing material can achieve the above object. It has been found that the present invention has been achieved.

【００１２】すなわち本願発明の耐摩耗性樹脂組成物
は、ポリアミド樹脂及びポリアセタール樹脂の中から選
択される樹脂を母材とし、強化材としてアラミド繊維が
１〜３０重量％配合されてなるものを要旨とする。That is, the abrasion-resistant resin composition of the present invention comprises a resin selected from a polyamide resin and a polyacetal resin as a base material and 1 to 30% by weight of aramid fiber as a reinforcing material. And

【００１３】また本願発明は、特にミニチュア軸受等と
称される極小径軸受の保持器として使用するのが好まし
く、以下、本発明を、極小径の軸受用保持器に適用した
場合を例に挙げて説明する。Further, the present invention is preferably used as a retainer of an ultra-small diameter bearing particularly called a miniature bearing or the like. Hereinafter, an example in which the present invention is applied to an ultra-small diameter bearing retainer will be described. Will be explained.

【００１４】本発明は、母材として、ナイロン等のポリ
アミド樹脂及びポリアセタール樹脂が使用され、これら
は単独で使用しても、併用して使用しても良い。これら
の樹脂は、成形性、耐油性に優れており、特に軸受用保
持器として好適に使用することができる。特にポリアミ
ド樹脂は、耐熱性に優れており、軸受用保持器として、
より一層好適に使用することができる。In the present invention, a polyamide resin such as nylon and a polyacetal resin are used as a base material, and these may be used alone or in combination. These resins are excellent in moldability and oil resistance, and can be suitably used particularly as bearing retainers. In particular, polyamide resin is excellent in heat resistance, and as a cage for bearings,
It can be more preferably used.

【００１５】なおポリアセタール樹脂は、ポリアミド樹
脂に対しては、若干耐熱性に劣るものであるが、ＨＤＤ
用軸受の保持器等として使用するような場合には、支障
のない程度に耐熱性を具備している。すなわちＨＤＤ等
においては、その実使用時最高温度が８０℃程度であ
り、ポリアセタール樹脂は、この温度に十分耐え得るこ
とが可能である。The polyacetal resin is slightly inferior in heat resistance to the polyamide resin,
When it is used as a cage for bearings for automobiles, it has heat resistance to the extent that it does not hinder it. That is, in an HDD or the like, the maximum temperature during actual use is about 80 ° C., and the polyacetal resin can sufficiently withstand this temperature.

【００１６】本発明の樹脂組成物は、強化材としてアラ
ミド（芳香族ポリアミド）繊維を配合する必要がある。
アラミド繊維は、ガラス繊維等と比べて、柔軟でしかも
強靭である。例えば、アラミド繊維は、十分な柔軟性を
有することから、強化材として配合した成形材料は、ガ
ラス繊維を配合したものと比較して、射出成形等の熱成
形時に、良好な流動性を得ることができ、金型の極小径
キャビィティ内にもスムーズに流れ込み、成形不良の発
生を有効に防止することができる。またアラミド繊維
は、ガラス繊維の約３倍の強度を有しており、強化材と
して少量配合するだけで、ガラス繊維を適量配合する場
合と同等、あるいはそれ以上の強度を得ることができ
る。更にアラミド繊維は、摺動減衰特性（耐摩耗性）に
非常に優れており、しかも自己潤滑特性に優れているた
め、摩擦面に露出した場合でも、ガラス繊維のように悪
影響を及ぼすことはなく、良好な潤滑性を得ることがで
きる。The resin composition of the present invention must contain aramid (aromatic polyamide) fiber as a reinforcing material.
Aramid fibers are more flexible and tougher than glass fibers and the like. For example, since aramid fiber has sufficient flexibility, a molding material compounded as a reinforcing material can obtain better fluidity during thermoforming such as injection molding as compared with a compounding material containing glass fiber. Thus, it can smoothly flow into the extremely small-diameter cavity of the mold, and the occurrence of molding defects can be effectively prevented. The aramid fiber has about three times the strength of the glass fiber, and the strength equal to or higher than the case where the glass fiber is appropriately mixed can be obtained only by adding a small amount as a reinforcing material. Furthermore, aramid fiber has excellent sliding damping properties (abrasion resistance) and excellent self-lubricating properties, so that it does not have the adverse effect of glass fiber even when exposed to the friction surface. And good lubricity can be obtained.

【００１７】またアラミド繊維は、耐熱性にも優れてお
り、樹脂組成物として十分な耐熱性を維持することが可
能であり、更にガラス繊維等と比べて非常に軽量であ
り、軽量の成形品を得ることが可能である。Aramid fibers are also excellent in heat resistance, can maintain sufficient heat resistance as a resin composition, and are extremely light in weight as compared with glass fibers and the like, and are lightweight molded articles. It is possible to obtain

【００１８】本発明において、アラミド繊維としては、
メタ型のもの、パラ型のものをいずれも使用することが
でき、具体的には、帝人株式会社製のテクノーラ（商品
名）、同社製のコーネックス（商品名）を使用するのが
好ましく、この中でも、強度、耐熱性が一段と優れてい
るテクノーラ（商品名）を使用するのが良い。In the present invention, as the aramid fiber,
Both meta-type and para-type can be used. Specifically, it is preferable to use Teijin's Technora (trade name) or Conex's (trade name), Among them, it is preferable to use Technora (trade name), which has further excellent strength and heat resistance.

【００１９】強化材としてのアラミド繊維の配合量は、
樹脂組成物中、１〜３０重量％配合するのが良く、好ま
しくは下限値を３重量％以上、上限値を２５重量％以
下、より好ましくは下限値を５重量％以上、上限値を１
５重量％以下に調整するのが良い。すなわちアラミド繊
維の配合量が少な過ぎる場合には、十分な強度等を得る
ことができない等、アラミド繊維配合による顕著な効果
を期待できないことがあるので、好ましくない。逆にア
ラミド繊維の配合量が多過ぎる場合には、成形材料とし
て流動性が低下し、成形が困難になる恐れがあるので、
好ましくない。The amount of aramid fiber as a reinforcing material is as follows:
In the resin composition, it is preferable to mix 1 to 30% by weight, preferably the lower limit is 3% by weight or more, the upper limit is 25% by weight or less, more preferably the lower limit is 5% by weight or more, and the upper limit is 1% by weight.
It is preferable to adjust the content to 5% by weight or less. That is, if the blending amount of the aramid fiber is too small, a remarkable effect due to the blending of the aramid fiber may not be expected, for example, a sufficient strength or the like may not be obtained. Conversely, if the amount of the aramid fiber is too large, the fluidity of the molding material decreases, and molding may be difficult.
Not preferred.

【００２０】強化材としてのアラミド繊維は、繊維径が
１０〜１５μｍ、好ましくは１２μｍ以下のものを使用
するのが良い。すなわち繊維径が太過ぎるものでは、成
形材料として流動性が低下し、成形が困難になる恐れが
あるので、好ましくない。なお繊維径が細過ぎるもの、
例えば１０μｍ未満のものは、本発明において、支障な
く使用可能であるが、入手が困難であるため、一般的な
使用には適していない。The aramid fiber as the reinforcing material has a fiber diameter of 10 to 15 μm, preferably 12 μm or less. That is, if the fiber diameter is too large, the fluidity of the molding material is reduced, and molding may be difficult. If the fiber diameter is too small,
For example, those having a particle diameter of less than 10 μm can be used without any problem in the present invention, but are not suitable for general use because they are difficult to obtain.

【００２１】更にアラミド繊維は、長さが、０．５〜
３．５ｍｍ、好ましくは下限値が０．７ｍｍ以上、上限
値が１．５ｍｍ以下のものを使用するのが良い。すなわ
ち繊維長さが長過ぎるものでは、成形材料として流動性
が低下し、成形が困難になる恐れがあるので、好ましく
ない。また繊維長さを過度に短くしても、それによる効
果は期待できず、逆に強度面において不利益が生じる恐
れがあるので、好ましくない。Further, the aramid fiber has a length of 0.5 to
It is good to use one with a lower limit of 3.5 mm, preferably a lower limit of 0.7 mm or more and an upper limit of 1.5 mm or less. That is, if the fiber length is too long, the fluidity of the molding material is reduced, and molding may be difficult. Further, if the fiber length is excessively shortened, the effect thereof cannot be expected, and on the contrary, there is a possibility that a disadvantage may occur in terms of strength, which is not preferable.

【００２２】本発明の樹脂組成物は、上記の母材及び強
化材の他に、摺動特性向上用の充填材を配合するのが好
ましい。It is preferable that the resin composition of the present invention further contains a filler for improving sliding properties in addition to the above-mentioned base material and reinforcing material.

【００２３】本発明における摺動特性向上用の充填材と
しては、超高分子量ポリエチレン、極小球状フェノール
樹脂を使用するのが好ましく、これらは単独で使用して
も、併用して使用しても良い。このうち超高分子量ポリ
エチレンは、自己潤滑性に優れ、摩擦係数が非常に小さ
く、非常に安価である。なお超高分子ポリエチレンは、
若干耐熱性に弱点を有しているが、使用環境温度が１２
０℃程度のところまでは、所望の物性を維持することが
でき、例えばＨＤＤ内部等で使用しても問題はなく、実
使用上の問題はない。As the filler for improving the sliding properties in the present invention, it is preferable to use ultrahigh molecular weight polyethylene and ultra-small spherical phenol resin, and these may be used alone or in combination. . Among them, ultrahigh molecular weight polyethylene is excellent in self-lubricating properties, has a very small coefficient of friction, and is very inexpensive. In addition, ultra high molecular weight polyethylene is
Although it has a weak point in heat resistance, the operating environment temperature is 12
Up to about 0 ° C., desired physical properties can be maintained. For example, there is no problem even when used inside an HDD or the like, and there is no problem in actual use.

【００２４】本発明において、この超高分子量ポリエチ
レンは、樹脂組成物中の配合量を、５〜３０重量％に調
整するのが良く、好ましくは下限値を１０重量％以上、
上限値を２０重量％以下に調整するのが良い。すなわち
配合量が少な過ぎると、摺動特性を顕著に向上させるこ
とが困難であり、逆に配合量が多過ぎても、それに見合
うだけの効果を期待できないので、無意味である。In the present invention, the amount of the ultrahigh molecular weight polyethylene in the resin composition is preferably adjusted to 5 to 30% by weight, and preferably the lower limit is 10% by weight or more.
The upper limit is preferably adjusted to 20% by weight or less. That is, if the blending amount is too small, it is difficult to remarkably improve the sliding characteristics. Conversely, if the blending amount is too large, the effect corresponding thereto cannot be expected, so it is meaningless.

【００２５】一方、極小球状フェノール樹脂は、耐熱性
に優れ、粒子径が１〜２０μｍ程度のものであり、それ
を配合した成形材料は、良好な流動特性を維持しつつ、
また成形品として摺動特性の向上を図ることができる。On the other hand, the extremely small spherical phenol resin is excellent in heat resistance and has a particle diameter of about 1 to 20 μm, and a molding material containing the same has good flow characteristics while maintaining good flow characteristics.
In addition, the sliding characteristics can be improved as a molded product.

【００２６】本発明において、この極小球状フェノール
樹脂は、樹脂組成物中の配合量を、５〜３０重量％に調
整するのが良く、好ましくは下限値を１０重量％以上、
上限値を２０重量％以下に調整するのが良い。すなわち
配合量が少な過ぎると、摺動特性を顕著に向上させるこ
とが困難であり、逆に配合量が多過ぎても、それに見合
うだけの効果を期待できないので、好ましくない。もっ
とも、極小球状フェノール樹脂は、３０重量％以上配合
したとしても、強度的な面において不利益が生じるよう
なことはない。In the present invention, the amount of the very small spherical phenolic resin in the resin composition is preferably adjusted to 5 to 30% by weight, and the lower limit is preferably 10% by weight or more.
The upper limit is preferably adjusted to 20% by weight or less. That is, if the blending amount is too small, it is difficult to remarkably improve the sliding characteristics. Conversely, if the blending amount is too large, the effect corresponding thereto cannot be expected. However, even if the ultra-small spherical phenolic resin is blended in an amount of 30% by weight or more, there is no disadvantage in strength.

【００２７】なお本発明においては、超高分子量ポリエ
チレン及び極小球状フェノール樹脂は、併用することに
よって、一段と摺動特性の向上を図ることができ、相乗
的な効果を得ることができる。In the present invention, by using the ultrahigh molecular weight polyethylene and the ultra-small spherical phenol resin together, the sliding characteristics can be further improved, and a synergistic effect can be obtained.

【００２８】本発明においては、言うまでもなく、上記
以外の添加剤を、必要に応じて、適当量添加するように
しても良い。In the present invention, needless to say, additives other than those described above may be added in an appropriate amount as required.

【００２９】本発明は、上記のポリアミド樹脂やポリア
セタール樹脂からなる母材に、強化材としてアラミド繊
維を配合し、更に必要に応じて、超高分子量ポリエチレ
ン及び微小球状フェノール樹脂からなる摺動特性向上用
充填材の他、適当な添加剤を配合して、成形材料を得
る。なおこのとき、油成分を同時に配合するようにし
て、後に製造される成形品として、含油性のものを製造
することにより、耐摩耗性を、より一層向上させるよう
にしても良い。According to the present invention, an aramid fiber is blended as a reinforcing material with the above-mentioned base material made of a polyamide resin or a polyacetal resin, and if necessary, the sliding characteristics made of an ultrahigh molecular weight polyethylene and a fine spherical phenol resin are improved. A molding material is obtained by blending a suitable additive in addition to the filler for use. At this time, the abrasion resistance may be further improved by blending the oil component at the same time and producing an oil-impregnated product as a molded product to be produced later.

【００３０】本発明において、耐摩耗性樹脂組成物の組
成原料の配合手段は、特に限定しなが、例えば、予めブ
レンダー等でドライブレンドして予備混練した後、二軸
押出機等により溶融混練して、ペレット形状とする。こ
のとき混練の際にアラミド繊維は、繊維が互いにからま
り合って、いわゆる「ダマ」の状態になり、十分に分散
し難くなるが、例えばカップリング剤の量を増やすか、
又はベヘン酸リチウムのような滑剤にまぶしてから、混
練押出機に投入すれば、十分に分散させることができ
る。In the present invention, the means of compounding the raw materials for the abrasion-resistant resin composition is not particularly limited. For example, after preliminarily kneading by dry blending in a blender or the like, melt kneading is performed by a twin screw extruder or the like. To form a pellet. At the time of kneading at this time, the aramid fibers are entangled with each other, forming a so-called "dama" state, which makes it difficult to sufficiently disperse, for example, by increasing the amount of the coupling agent,
Alternatively, after being coated with a lubricant such as lithium behenate and then charged into a kneading extruder, it can be sufficiently dispersed.

【００３１】そしてこの成形材料を、射出成形等により
熱成形して、例えば極小サイズの軸受用の冠型保持器を
得るものである。なお、このとき得られた成形品を潤滑
油に浸して含油させて、成形品として耐摩耗性の向上を
図るようにしても良い。Then, the molding material is thermoformed by injection molding or the like to obtain, for example, a crown-shaped cage for an extremely small size bearing. The molded product obtained at this time may be immersed in lubricating oil to be impregnated with oil to improve the wear resistance of the molded product.

【００３２】こうして得られた成形品は、良好な摺動特
性（耐摩耗性）を具備し、更に十分な強度を具備するも
のであり、実使用において十分な耐熱性を具備し、しか
も軽量である。The molded article thus obtained has good sliding properties (abrasion resistance), has sufficient strength, has sufficient heat resistance in actual use, and is light in weight. is there.

【００３３】また成形材料の流動特性にも非常に優れて
おり、射出成形時等において、成形材料が金型のキャビ
ィティ内に隅々まで十分に行き渡るようになり、極小サ
イズの成形品、例えば軸受用の冠型保持器等を確実に得
ることができる。Further, the flow characteristics of the molding material are also very excellent, and the molding material can sufficiently spread all over the cavities of the mold at the time of injection molding or the like. Can be reliably obtained.

【００３４】なお本発明において、樹脂組成物という場
合、各必要成分が配合された熱成形前の配合物はもちろ
ん、熱成形後の成形品も含むものである。In the present invention, the term "resin composition" includes not only the compound before the thermoforming in which the necessary components are compounded but also the molded product after the thermoforming.

【００３５】[0035]

【実施例】以下、本発明に関連した実施例及びその効果
を導出するための比較例につき、具体的に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments related to the present invention and comparative examples for deriving the effects thereof will be specifically described.

【００３６】＜使用材料の説明＞実施例等を行うにあた
って下記の材料を準備した。<Explanation of Materials Used> The following materials were prepared in carrying out Examples and the like.

【００３７】１．母材 ＰＡ６６…ナイロン６６（ポリアミド樹脂） ２．強化材 アラミド繊維…繊維径１２μｍ、繊維長さ１ｍｍ、帝人
株式会社製のテクノローラ（商品名） ガラス繊維…繊維径１２μｍ、繊維長さ０．０２〜０．
０３ｍｍ ３．摺動特性向上用の充填材 ＵＨＭＷＰＥ…超高分子量ポリエチレン、三井石油化学
工業株式会社製のハイゼックス・ミリオン（商品名） 微小球状フェノール…鐘紡株式会社製のベルパール（商
品名） ＜実施例１＞1. Base material PA66: Nylon 66 (polyamide resin) Reinforcing material Aramid fiber: Fiber diameter 12 μm, fiber length 1 mm, Techno Roller (trade name) manufactured by Teijin Limited Glass fiber: Fiber diameter 12 μm, fiber length 0.02-0.
03mm 3. Filler for improving sliding properties UHMWPE: Ultra-high molecular weight polyethylene, Hyzex Million (trade name) manufactured by Mitsui Petrochemical Industries, Ltd. Microspherical phenol: Bell Pearl (trade name) manufactured by Kanebo Co., Ltd. <Example 1>

【表１】 上表１に示すように、ＰＡ６６を８０重量％、アラミド
繊維を５重量％、ＵＨＭＷＰＥを１５重量％配合して混
合し、成形材料を得、その成形材料を用いて、射出成形
を行い、極小径軸受用の冠型保持器（外径９．８ｍｍ）
と、物性試験用試験片及び耐摩耗性試験用の円筒状試験
片等、後述する各試験法に準拠した試験片とを形成し
た。[Table 1] As shown in Table 1 above, 80% by weight of PA66, 5% by weight of aramid fiber, and 15% by weight of UHMWPE were blended and mixed to obtain a molding material, and the molding material was used to perform injection molding. Crown type cage for small diameter bearings (outer diameter 9.8mm)
And a test piece conforming to each test method described later, such as a test piece for a physical property test and a cylindrical test piece for a wear resistance test.

【００３８】＜実施例２〜６＞同表に示す配合割合で、
上記と同様にして、成形材料を得、同様に射出成形を行
って軸受用保持器、及び後述する各試験法に準拠した試
験片を得た。<Examples 2 to 6> At the compounding ratios shown in the same table,
A molding material was obtained in the same manner as described above, and injection molding was performed in the same manner to obtain a bearing retainer and a test piece conforming to each test method described later.

【００３９】＜比較例１＞同表に示すように、ＰＡ６６
が１００重量％の成形材料を用いて、上記と同様に射出
成形を行い、軸受用保持器、及び後述する各試験法に準
拠した試験片を得た。Comparative Example 1 As shown in the table, PA66
Injection molding was performed in the same manner as described above using a molding material of 100% by weight to obtain a bearing cage and a test piece conforming to each test method described later.

【００４０】＜比較例２〜４＞同表に示す配合割合で、
上記と同様にして、成形材料を得、同様に射出成形を行
って、軸受用保持器、及び後述する各試験法に準拠した
試験片を得た。<Comparative Examples 2 to 4>
A molding material was obtained in the same manner as described above, and injection molding was performed in the same manner to obtain a bearing cage and a test piece conforming to each test method described later.

【００４１】＜物性の測定＞上記のようにして得られた
実施例及び比較例の各試験片に対し、以下の物性をそれ
ぞれ測定し、その測定結果を下表２に示す。<Measurement of Physical Properties> The following physical properties were measured for each of the test pieces of Examples and Comparative Examples obtained as described above, and the measurement results are shown in Table 2 below.

【００４２】１．引っ張り強さ［ＭＰａ］…ＡＳＴＭ
Ｄ ６３８に準拠 ２．伸び［％］…ＡＳＴＭ Ｄ ６３８に準拠 ３．曲げ強さ［ＭＰａ］…ＡＳＴＭ Ｄ ７９０に準拠 ４．曲げ弾性率［ＧＰａ］…ＡＳＴＭ Ｄ ７９０に準
拠 ５．アイゾット衝撃強さ（ノッチ付）［Ｊ／Ｍ］…ＡＳ
ＴＭ Ｄ ２５６に準拠 ６．限界ＰＶ値［kgf/cm2 ・cm/s］…ＪＩＳ Ｋ ７２
１８に準拠して、滑り速度が５０［cm/s］の場合と、１
００［cm/s］の場合との限界ＰＶ値を測定した。1. Tensile strength [MPa] ASTM
1. Compliant with D 638. 2. Elongation [%]: conforming to ASTM D 638 3. Bending strength [MPa] ... in accordance with ASTM D790. 4. Flexural modulus [GPa]… according to ASTM D790. Izod impact strength (with notch) [J / M] AS
5. Compliant with TMD256. Limit PV value [kgf / cm 2 · cm / s] JIS K72
According to No. 18, when the sliding speed is 50 [cm / s], 1
The limit PV value of the case of 00 [cm / s] was measured.

【００４３】[0043]

【表２】 ＜評価＞上表２から理解できるように、本発明に関連し
た実施例のものは、従来の軸受用保持器材料として一般
的な比較例３のものに比べて、いずれも限界ＰＶ値が大
幅にアップしており、耐摩耗性の向上が見られる等、優
れた評価が得られた。中でも、特定の成分を配合した
り、配合割合を特定の範囲に設定した実施例１〜３のも
のは、より一層優れた評価が得られた。[Table 2] <Evaluation> As can be understood from Table 2 above, all of the examples related to the present invention have a large limit PV value as compared with the conventional comparative example 3 as a bearing cage material. And the abrasion resistance was improved. Among them, those of Examples 1 to 3 in which specific components were mixed or the mixing ratio was set in a specific range, more excellent evaluations were obtained.

【００４４】これに対し、本発明の要旨を逸脱する比較
例のものは、いずれかの評価に劣っている。On the other hand, the comparative example deviating from the gist of the present invention is inferior in any of the evaluations.

【００４５】なお、本発明に関連した実施例のものは、
射出成形時において、いずれも良好な流動性が得られ、
成形不良の発生は認められなかった。これに対し、比較
例２、３のものは、所望の流動性が得られず、成形不良
の発生が若干認められた。In the embodiments related to the present invention,
At the time of injection molding, good fluidity is obtained,
No molding failure was observed. On the other hand, in the case of Comparative Examples 2 and 3, the desired fluidity was not obtained, and the occurrence of molding defects was slightly observed.

【００４６】[0046]

【発明の効果】以上のように、本発明によれば、射出成
形等の熱成形時において、良好な流動性及び成形性を確
保しつつ、摺動特性及び強度に優れた合成樹脂成形品、
例えば極小径軸受用保持器を提供することができるとい
う効果がある。As described above, according to the present invention, at the time of thermoforming such as injection molding, a synthetic resin molded product excellent in sliding characteristics and strength while securing good fluidity and moldability.
For example, there is an effect that a cage for an extremely small diameter bearing can be provided.

【００４７】また本発明において、特定の成分を特定の
割合で配合した場合には、摺動特性をより一層向上させ
ることができるという利点がある。In the present invention, when a specific component is mixed in a specific ratio, there is an advantage that the sliding characteristics can be further improved.

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

【図１】極小径軸受を示す断面図である。FIG. 1 is a sectional view showing an extremely small diameter bearing.

【図２】極小径軸受に適用された保持器を示す斜視図で
ある。FIG. 2 is a perspective view showing a cage applied to a very small diameter bearing.

【符号の説明】[Explanation of symbols]

４…軸受用保持器 4 ... Cage for bearing

Claims (6)

【特許請求の範囲】[Claims] 【請求項１】 ポリアミド樹脂及びポリアセタール樹脂
の中から選択される樹脂を母材とし、強化材としてアラ
ミド繊維が１〜３０重量％配合されてなることを特徴と
する耐摩耗性樹脂組成物。1. A wear-resistant resin composition comprising a resin selected from a polyamide resin and a polyacetal resin as a base material and 1-30% by weight of aramid fiber as a reinforcing material. 【請求項２】 摺動特性向上用の充填材として超高分子
量ポリエチレンが５〜３０重量％配合されてなる請求項
１記載の耐摩耗性樹脂組成物。2. The wear-resistant resin composition according to claim 1, wherein 5 to 30% by weight of ultrahigh molecular weight polyethylene is blended as a filler for improving the sliding properties. 【請求項３】 摺動特性向上用の充填材として微小球状
フェノール樹脂が５〜３０重量％配合されてなる請求項
１又は２記載の耐摩耗性樹脂組成物。3. The wear-resistant resin composition according to claim 1, wherein 5 to 30% by weight of a fine spherical phenol resin is blended as a filler for improving the sliding properties. 【請求項４】 ポリアミド樹脂及びポリアセタール樹脂
の中から選択される樹脂を母材とし、強化材としてアラ
ミド繊維が１〜３０重量％配合された耐摩耗性樹脂組成
物からなることを特徴とする軸受用保持器。4. A bearing comprising a wear-resistant resin composition containing a resin selected from a polyamide resin and a polyacetal resin as a base material and 1-30% by weight of aramid fiber as a reinforcing material. For cage. 【請求項５】 前記耐摩耗性樹脂組成物に、摺動特性向
上用の充填材として超高分子量ポリエチレンが５〜３０
重量％配合されてなる請求項４記載の軸受用保持器。5. An ultra-high-molecular-weight polyethylene as a filler for improving sliding characteristics is added to the wear-resistant resin composition in an amount of 5 to 30.
The bearing retainer according to claim 4, which is blended by weight. 【請求項６】 前記耐摩耗性樹脂組成物に、摺動特性向
上用の充填材として微小球状フェノール樹脂が５〜３０
重量％配合されてなる請求項４又は５記載の軸受用保持
器。6. A fine spherical phenolic resin as a filler for improving sliding properties is added to the wear-resistant resin composition in an amount of 5 to 30.
The bearing retainer according to claim 4 or 5, which is blended by weight.
JP8226957A 1996-08-28 1996-08-28 Wear resistant resin composition, and cage for bearing Pending JPH1068420A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8226957A JPH1068420A (en) 1996-08-28 1996-08-28 Wear resistant resin composition, and cage for bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8226957A JPH1068420A (en) 1996-08-28 1996-08-28 Wear resistant resin composition, and cage for bearing

Publications (1)

Publication Number Publication Date
JPH1068420A true JPH1068420A (en) 1998-03-10

Family

ID=16853278

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8226957A Pending JPH1068420A (en) 1996-08-28 1996-08-28 Wear resistant resin composition, and cage for bearing

Country Status (1)

Country Link
JP (1) JPH1068420A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007192304A (en) * 2006-01-19 2007-08-02 Jtekt Corp Retainer for ball bearing and ball bearing
JP2014163486A (en) * 2013-02-27 2014-09-08 Nsk Ltd Light-weight spindle device and finger for spindle device
US20150337901A1 (en) * 2013-02-05 2015-11-26 Ntn Corporation Rolling bearing retainer and method for manufacturing such retainer
JP2018087637A (en) * 2017-12-25 2018-06-07 Ntn株式会社 Slide bearing

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007192304A (en) * 2006-01-19 2007-08-02 Jtekt Corp Retainer for ball bearing and ball bearing
US20150337901A1 (en) * 2013-02-05 2015-11-26 Ntn Corporation Rolling bearing retainer and method for manufacturing such retainer
US9771980B2 (en) * 2013-02-05 2017-09-26 Ntn Corporation Rolling bearing retainer and method for manufacturing such retainer
JP2014163486A (en) * 2013-02-27 2014-09-08 Nsk Ltd Light-weight spindle device and finger for spindle device
JP2018087637A (en) * 2017-12-25 2018-06-07 Ntn株式会社 Slide bearing

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