JP4038635B2 - Manufacturing method of resin cage for rolling bearing - Google Patents
Manufacturing method of resin cage for rolling bearing Download PDFInfo
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- JP4038635B2 JP4038635B2 JP02427699A JP2427699A JP4038635B2 JP 4038635 B2 JP4038635 B2 JP 4038635B2 JP 02427699 A JP02427699 A JP 02427699A JP 2427699 A JP2427699 A JP 2427699A JP 4038635 B2 JP4038635 B2 JP 4038635B2
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- Japan
- Prior art keywords
- resin
- cage
- rolling bearing
- approximately
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Description
【０００１】
本発明は転がり軸受用保持器の製造方法に関し、特に、転動体の組み込みが容易で、しかも耐熱性に優れた冠型の転がり軸受用樹脂製保持器を製造することのできる方法に関する。
【０００２】
【従来の技術】
転がり軸受用の樹脂製保持器の材質としては、従来、コストや生産性および機械的特性等からポリアミド樹脂が多用されていたが、ポリアミド樹脂は１５０℃以上の環境下で使用することはできず、このような１５０℃以上の高温の環境下で使用可能な樹脂材料としては、従来、比較的安価なポリフェニレンサルファイド樹脂（以下、ＰＰＳ樹脂と称する）が知られている。
【０００３】
【発明が解決しようとする課題】
しかしながら、転がり軸受用の樹脂製保持器に高温対応樹脂であるＰＰＳ樹脂を用いた場合には、以下に示す問題がある。
すなわち、玉軸受用の保持器においては、転動体（ボール）を保持するポケット部が球面の一部により構成されることが最も好ましいのであるが、そのためには、射出成形工程において成形品を撓ませて離型する、いわゆる無理抜きをする必要がある。ＰＰＳ樹脂をはじめとする高温対応樹脂は一般に靱性に乏しく、この無理抜きによって破損する場合がある。
【０００４】
特に、図１に外観斜視図を示し、図２（Ａ）にその要部正面図を、同図（Ｂ）にはそのポケット１１の中心を通る縦断面図を例示するように、ポケット１１内にボールを方持ち状に保持すべく、基低部１０から互いに対向する２本の爪部１２ａ，１２ｂを突出させてポケット壁体を構成した冠型保持器においては、開放端であるポケット１１の入口部の開口寸法（対向する各爪部１２ａ，１２ｂの先端部間の距離）Ａが、ポケット最大径（ポケット１１の球面の直径）Ｂよりも１０％程度小さいアンダーカット状となっており、離型時に爪部１２ａ，１２ｂ等が破損してしまうという問題がある。
【０００５】
また、このような球面状のポケットを有する樹脂製保持器においては、一般に、組み立て工程において、各ポケット内にスナップフィットを利用してポールが挿入されるが、その際にも、ＰＰＳ樹脂等の低靱性の樹脂を用いた場合には、冠型保持器においては爪部１２ａ，１２ｂが破損しやすいという問題がある。
【０００６】
本発明はこのような実情に鑑みてなされたもので、１５０℃の高温の環境下で充分に使用可能で、また、耐油性等の軸受用保持器としてのその他の性能も満足するとともに、しかも高い靱性を有してボールのスナップフィット時において破損等の不具合を生じることのない冠型の転がり軸受用樹脂製保持器を、成形に際しての離型時に爪部の損傷等を生じ ることなく製造することのできる方法の提供を目的としている。
【０００７】
【課題を解決するための手段】
上記の目的を達成するため、本発明の転がり軸受用樹脂製保持器の製造方法は、ポケット部が球面形状であり、このポケット部の開放端であるポケット入口部の開口寸法が当該ポケット部の最大径よりも略１０％小さいアンダーカット状の冠形保持器で、かつ、１５０℃〜１７０℃の高温環境下で使用される転がり軸受用の樹脂製保持器の製造方法であって、樹脂成分が、主成分としてポリフェニレンサルファイド樹脂とポリアミド樹脂を略１：１の割合で含有するポリマーアロイで、連続使用上限温度が１５０℃〜１７０℃の材料を、成形品を撓ませて離型する無理抜きを行う射出成形により成形することによって特徴づけられる。
【０００８】
本発明は、各種樹脂材料についての種々の実験、研究を重ねた結果としてなされたもので、１５０℃以上の高温での使用が可能で、かつ、転がり軸受用保持器としての耐油性等の性能を満足し、しかも高い靱性を有する樹脂材料として、主成分としてＰＰＳ樹脂とＰＡ樹脂を略１：１の割合で含有するポリマーアロイが適していることが見いだされた。
【０００９】
すなわち、主成分としてＰＰＳ樹脂とＰＡ樹脂を略１：１の割合で含有するポリマーアロイは、１５０℃以上の高温での連続使用が可能でありながら、ＰＰＳ樹脂に比して高い靱性を有し、また、耐油性等の転がり軸受用樹脂製保持器に要求される他の要件をも満たし、球面形状のポケット部で、かつ、ポケット部の開放端であるポケット入口部の開口寸法が当該ポケット部の最大径よりも略１０％小さいアンダーカット状の構造を有する冠型の保持器の射出成形に適用して、離型時の無理抜きやスナップフィットによるボールの組み込み時にも爪部の損傷等が生じないことが確認された。
【実施例】
（実施例１）
主成分としてＰＰＳ樹脂とＰＡ樹脂１：１の割合で含有するポリマーアロイに、強化ガラス繊維を１５重量％の割合で含有させた材料（大日本インキ株式会社製ＰＮ２１５、連続使用上限温度１５０〜１７０℃、ＡＳＴＭ Ｄ−７９０に基づく曲げ弾性率６．０×１０4 ｋｇｆ／ｃｍ2 ，曲げ破断伸び２．７％）を用いて、図１，図２に示した構造を持ち、ポケット１１の入口部の開口寸法Ａが５．５１ｍｍ、ポケット１１の球面の直径Ｂが６．０６ｍｍの冠型保持器を射出成形した。
【００１０】
射出成形後の離型に際して、ポケット１１の爪部１２ａ，１２ｂをはじめとして各部位の破損は全く生じず、また、成形品の各ポケット１１内に直径１５／６４インチ（約５．９５３ｍｍ）のボールをスナップフィットにより組み込んだが、その際にも各爪部１２ａ，１２ｂをはじめとして各部位の破損は見られなかった。
【００１１】
（実施例２）
主成分としてＰＰＳ樹脂とＰＡ樹脂１：１の割合で含有するポリマーアロイに、強化ガラス繊維を３０重量％の割合で含有させた材料（大日本インキ株式会社製ＰＮ２３０、連続使用上限温度１５０〜１７０℃、ＡＳＴＭ Ｄ−７９０に基づく曲げ弾性率９．０×１０4 ｋｇｆ／ｃｍ2 ，曲げ破断伸び２．３％）を用いて、実施例１と全く同じ冠型保持器を射出成形した。
【００１２】
射出成形後の離型に際して、ポケット１１の爪部１２ａ，１２ｂをはじめとして各部位の破損は全く生じず、また、成形品の各ポケット１１内に上記と同じボールをスナップフィットにより組み込んだが、その際にも各爪部１２ａ，１２ｂをはじめとして各部位の破損は見られなかった。
【００１３】
（比較例）
ＰＰＳ樹脂に、強化ガラス繊維を３０重量％の割合で含有させた材料（大日本インキ株式会社製Ｇ３０、連続使用上限温度２００〜２２０℃、ＡＳＴＭ Ｄ７９０に基づく曲げ弾性率１１．０×１０4 ｋｇｆ／ｃｍ2 ，曲げ破断伸び１．８％）を用いて、実施例と全く同じ冠型保持器を射出成形した。
【００１４】
射出成型後の離型に際して、ポケット１１の爪部１２ａ，１２ｂが破損するものが多く、また、成形品のポケット１１内に上記と同じボールをスナップフィットにより組み込んだが、その際、爪部１２ａまたは１２ｂが破損したものが多かった。
【００１５】
【発明の効果】
本発明によれば、ポケット部を球面形状として、ポケット入口部分の径がポケット最大径よりも１０％程度小さいアンダーカット部を有する冠型の樹脂製保持器の射出成形に際しては、離型時に爪部が損傷しやすく、また、スナップフィットによるボールの組み込み時における爪部の損傷が多発してＰＰＳ樹脂の使用が不可能であったものが、これらの不具合を生じることなく、１５０℃以上の高温環境下で連続使用が可能とすることのできる冠型の転がり軸受用樹脂製保持器が得られる。
【図面の簡単な説明】
【図１】 本発明が対象とする冠型保持器の例を示す外観図である。
【図２】 図２（Ａ）は図１の冠型保持器の要部正面図であり、図２（Ｂ）はそのポケット１１の中心を通る縦断面図である。
【符号の説明】
１０ 基低部
１１ ポケット
１２ａ，１２ｂ 爪部[0001]
The present invention relates to a method for manufacturing a cage for a rolling bearing, and more particularly to a method capable of manufacturing a crown type resin cage for a rolling bearing that is easy to incorporate rolling elements and has excellent heat resistance.
[0002]
[Prior art]
Conventionally, polyamide resin has been widely used as a material for resin cages for rolling bearings due to cost, productivity, mechanical properties, etc., but polyamide resin cannot be used in an environment of 150 ° C or higher. As a resin material that can be used in such a high temperature environment of 150 ° C. or higher, a relatively inexpensive polyphenylene sulfide resin (hereinafter referred to as PPS resin) has been conventionally known.
[0003]
[Problems to be solved by the invention]
However, when a PPS resin that is a high-temperature compatible resin is used for a resin cage for a rolling bearing, there are the following problems.
That is, in the cage for the ball bearing, the rolling is element pocket that holds the (ball) is is most preferred to be constituted by part of a spherical surface, For this purpose, the molded article in an injection molding process It is necessary to perform so-called unreasonableness by bending and releasing the mold. High-temperature compatible resins such as PPS resins generally have poor toughness, and may be damaged by this forced removal.
[0004]
In particular, FIG. 1 shows an external perspective view, FIG. 2 (A) shows a front view of the main part, and FIG. 1 (B) shows a longitudinal sectional view passing through the center of the
[0005]
In such a resin cage having a spherical pocket, a pole is generally inserted into each pocket using a snap fit in an assembly process. When the resin having low toughness is used, there is a problem that the
[0006]
The present invention has been made in view of such circumstances, and can be sufficiently used in a high-temperature environment of 150 ° C., and satisfies other performances as a bearing cage such as oil resistance. Rukoto produce high breakage troubles such that no crown type of rolling bearing resin cage causing the during the snap-fit of the ball Lumpur has toughness, damage of the claw portion at the time of release of the time molding The object is to provide a method that can be manufactured without any problems .
[0007]
[Means for Solving the Problems]
To achieve the above object, a method of manufacturing the rolling rising resin cage bearing of the present invention is a pocket portion is spherical, the opening dimension is the pocket of the pocket inlet is an open end of the pocket portion in approximately 10% smaller undercut of snap cage than the maximum diameter of the parts, and a method for producing a resin cage for a rolling bearing, which is used in a high temperature environment of 0.99 ° C. to 170 ° C., Resin component is a polymer alloy containing polyphenylene sulfide resin and polyamide resin as main components in a ratio of approximately 1: 1, and a material having a continuous use upper limit temperature of 150 ° C. to 170 ° C. is bent by releasing the molded product. It is characterized by being molded by injection molding with forced removal.
[0008]
The present invention was made as a result of repeated various experiments and researches on various resin materials, and can be used at a high temperature of 150 ° C. or higher, and performance such as oil resistance as a rolling bearing cage. It has been found that a polymer alloy containing PPS resin and PA resin as main components in a ratio of approximately 1: 1 is suitable as a resin material having high toughness.
[0009]
That is, a polymer alloy containing PPS resin and PA resin as main components in a ratio of approximately 1: 1 has high toughness compared to PPS resin while being continuously usable at a high temperature of 150 ° C. or higher. In addition, it satisfies other requirements for resin cages for rolling bearings such as oil resistance, and has a spherical pocket part and the opening dimension of the pocket inlet part which is the open end of the pocket part. Applied to injection molding of crown-shaped cages that have an undercut-like structure that is approximately 10% smaller than the maximum diameter of the part. It was confirmed that no occurred.
【Example】
Example 1
A material containing 15% by weight of reinforced glass fiber in a polymer alloy containing PPS resin and PA resin at a ratio of 1: 1 as a main component (PN215 manufactured by Dainippon Ink Co., Ltd., continuous use upper limit temperature 150 to 170) 1 and FIG. 2 using a bending elastic modulus of 6.0 × 10 4 kgf / cm 2 and a bending breaking elongation of 2.7% based on ASTM D-790. A crown type cage having an opening dimension A of 5.51 mm and a spherical diameter B of the
[0010]
At the time of mold release after injection molding, damage to each part including the
[0011]
(Example 2)
A material in which a reinforced glass fiber is contained in a proportion of 30% by weight in a polymer alloy containing PPS resin and PA resin as a main component in a ratio of 1: 1 (Dai Nippon Ink Co., Ltd., PN230, continuous use upper limit temperature 150 to 170) The same crown type cage as in Example 1 was injection-molded using a bending elastic modulus of 9.0 × 10 4 kgf / cm 2 and a bending breaking elongation of 2.3% according to ASTM D-790.
[0012]
At the time of mold release after injection molding, damage to each part including the
[0013]
(Comparative example)
Material containing 30% by weight of reinforced glass fiber in PPS resin (G30 manufactured by Dainippon Ink Co., Ltd., continuous use upper limit temperature 200-220 ° C., flexural modulus 11.0 × 10 4 kgf based on ASTM D790 / Cm 2 , bending elongation at breakage 1.8%) was used to injection-mold exactly the same crown cage as in the example.
[0014]
During the mold release after injection molding, the
[0015]
【The invention's effect】
According to the present invention, in the injection molding of the crown-shaped resin cage having the pocket portion having a spherical shape and the pocket entrance portion having an undercut portion whose diameter is about 10% smaller than the pocket maximum diameter , The nail part is easily damaged, and the nail part is frequently damaged due to snap fit , and the use of PPS resin is not possible. A resin cage for a crown type rolling bearing that can be continuously used in a high temperature environment is obtained.
[Brief description of the drawings]
FIG. 1 is an external view showing an example of a crown-type cage that is a subject of the present invention.
2A is a front view of a main part of the crown type cage shown in FIG. 1, and FIG. 2B is a longitudinal sectional view passing through the center of the
[Explanation of symbols]
10 base
Claims (1)
樹脂成分が、主成分としてポリフェニレンサルファイド樹脂とポリアミド樹脂を略１：１の割合で含有するポリマーアロイで、連続使用上限温度が１５０℃〜１７０℃の材料を、成形品を撓ませて離型する無理抜きを行う射出成形により成形することを特徴とする高温環境用転がり軸受用樹脂製保持器の製造方法。 Pocket portion is spherical, with approximately 10% smaller undercut of snap cage than the maximum diameter of the opening size the pocket of the pocket inlet is an open end of the pocket portion, and, 0.99 ° C. A method for producing a resin cage for a rolling bearing used under a high temperature environment of ˜170 ° C.,
Resin component is a polymer alloy containing polyphenylene sulfide resin and polyamide resin as main components in a ratio of approximately 1: 1, and a material having a continuous use upper limit temperature of 150 ° C. to 170 ° C. is released by bending the molded product. A method for producing a resin cage for a rolling bearing for high-temperature environments, characterized by molding by injection molding forcibly removing .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02427699A JP4038635B2 (en) | 1999-02-01 | 1999-02-01 | Manufacturing method of resin cage for rolling bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02427699A JP4038635B2 (en) | 1999-02-01 | 1999-02-01 | Manufacturing method of resin cage for rolling bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000220642A JP2000220642A (en) | 2000-08-08 |
| JP4038635B2 true JP4038635B2 (en) | 2008-01-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02427699A Expired - Fee Related JP4038635B2 (en) | 1999-02-01 | 1999-02-01 | Manufacturing method of resin cage for rolling bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4038635B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8104971B2 (en) * | 2007-08-28 | 2012-01-31 | Jtekt Corporation | Resin cage for ball bearing |
-
1999
- 1999-02-01 JP JP02427699A patent/JP4038635B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000220642A (en) | 2000-08-08 |
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