JPH09264326A - Oil-impregnated sintered bearing, and its manufacture - Google Patents
Oil-impregnated sintered bearing, and its manufactureInfo
- Publication number
- JPH09264326A JPH09264326A JP9761596A JP9761596A JPH09264326A JP H09264326 A JPH09264326 A JP H09264326A JP 9761596 A JP9761596 A JP 9761596A JP 9761596 A JP9761596 A JP 9761596A JP H09264326 A JPH09264326 A JP H09264326A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- thrust
- metal body
- impregnated bearing
- sintered
- 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
Links
Landscapes
- Sliding-Contact Bearings (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、中央に軸受部を形
成した圧粉成形焼結金属体からなる含油軸受およびその
製造方法に関し、とくにスラスト端面の馴染み特性を向
上させて高スラスト負荷重に耐えることができるように
し、これによってバラツキのない高品質の焼結含油軸受
を得ることを目的とする。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-impregnated bearing made of a powder-compacted sintered metal body having a bearing portion formed in the center thereof and a method of manufacturing the same, and more particularly to improving the familiar property of the thrust end face to achieve a high thrust load weight. The object is to obtain a high-quality sintered oil-impregnated bearing which can withstand the pressure and thereby has no variation.
【０００２】[0002]
【従来の技術】圧粉成形焼結金属体からなる焼結含油軸
受は、低コスト・軽量・低騒音等の特性を有するところ
から、電子機器類や精密機器類をはじめとし、これまで
広範囲の各種摺動回転機器に使用されてきた。 しかし
焼結含油軸受は、その独特の構造ならびに潤滑形態を有
するものであるところから、ラジアル荷重に対しては十
分な耐久性を有する反面、スラスト荷重に対しては高負
荷に耐えきれないという欠点を有している。2. Description of the Related Art Sintered oil-impregnated bearings made of powder compacted sintered metal bodies have characteristics such as low cost, light weight and low noise. Therefore, they have been widely used in electronic equipment and precision equipment. It has been used for various sliding rotary devices. However, since the sintered oil-impregnated bearing has its unique structure and lubrication form, it has sufficient durability against radial loads, but it cannot withstand high loads against thrust loads. have.
【０００３】そのためにスラスト荷重に耐えるようにす
るために、これまで次のような解決策が講じられてき
た。 第１番目のグループは、軸受のスラスト端面に、
任意数の浅い凹部を形成して回転に伴う潤滑油の連れ込
み作用を生じさせるようにしたもの（実開昭５７−６３
１２１号）、あるいは同じく軸受端面に複数の溝や凹み
を形成し、これにより潤滑油のまわりを良くし、焼き付
きを防止するようにしたもの（特開昭５０−３５５５２
号）が知られる。Therefore, in order to withstand the thrust load, the following solutions have been taken so far. The first group is on the thrust end face of the bearing,
An arbitrary number of shallow recesses are formed so as to cause the action of lubricating oil entrained with rotation (Actual No. Sho 57-63).
No. 121), or similarly, a plurality of grooves or dents are formed on the end face of the bearing to improve the surrounding of the lubricating oil and prevent seizure (Japanese Patent Application Laid-Open No. 50-35552).
No.) is known.
【０００４】また第２番目には、平板状の軸受における
スラスト端面に、周方向に向けて順次複数個のテーパー
ドランドを連設するとともに、該テーパードランドを、
軸の滑り方向に対して基底から１つの境界部まで登り勾
配を有した第１の傾斜平面と、前記境界部から頂部側に
かけて、上記した第１の傾斜平面より緩い登り勾配を有
した第２の緩傾斜面とを有する緩急２つの両くさび形油
膜形成軸受面によって形成されるようにすることによ
り、くさび形油膜の厚さを大きくして焼き付きを無くす
ようにしたもの（特公昭６３−３３０１０号）等も知ら
れている。Secondly, a plurality of tapered lands are successively arranged in the circumferential direction on the thrust end surface of the flat bearing, and the tapered lands are connected to each other.
A first inclined plane having an ascending slope from the base to one boundary with respect to the sliding direction of the shaft, and a second slope having a gentler ascending slope from the first inclined plane from the boundary to the top side. And a steep two-sided wedge-shaped oil film forming bearing surface having a gentle inclined surface of the wedge-shaped oil film to increase the thickness of the wedge-shaped oil film and eliminate seizure (Japanese Patent Publication No. 63-33010). No.) etc. are also known.
【０００５】さらに第３番目は、軸受のスラスト端面
に、大径のものから順次小径となるよう大小複数枚のス
ラストワッシャーを積層状に組みつけるとともに、各ス
ラストワッシャーの外周に形成されたバリが、これより
小径の隣接ワッシャー側に向くように順次組み込むよう
にし、ワッシャーのバリ突出による摺動不完全を無くす
ようにしたもの（特開平１−２４２８１４号）が知られ
る。Thirdly, a plurality of large and small thrust washers are assembled on the thrust end surface of the bearing so that the diameters of the bearings are increased from the larger diameter one by one, and the burrs formed on the outer periphery of each thrust washer. There is a known one (Japanese Unexamined Patent Publication No. 1-2242814) in which they are sequentially assembled so as to face the adjacent washer having a smaller diameter than this, and incomplete sliding due to flash protrusion of the washer is eliminated.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記し
た第１番目のグループに属する従来技術にあっては、そ
のいずれもが軸受けのスラスト端面に、局所的な溝や凹
部を形成することにより、これら局所的な溝や凹部の周
縁部に対してオイルを供給することを基本的な狙いとし
たものであり、上記したスラスト端面の全周面にわたる
均等なオイルの供給は全く期待できない。 したがって
軸受けのスラスト端面における特に肝心な摺動面でのオ
イルは不足しがちとなり、耐久性に大きく影響を与える
ことになる。However, in the prior arts belonging to the above-mentioned first group, all of them are formed by forming local grooves or recesses on the thrust end face of the bearing. The basic aim is to supply oil to the peripheral edge of the local groove or recess, and the uniform supply of oil over the entire peripheral surface of the thrust end face cannot be expected at all. Therefore, the oil tends to run short on the particularly important sliding surface at the thrust end surface of the bearing, greatly affecting the durability.
【０００７】焼結含油軸受けのスラスト摺動端面におけ
る潤滑油に関しては、（摺動面の油量）＝（摺動面への
油の供給量）−（摺動面からの油の逃げ）の関係にあ
り、したがってスラスト端面の摺動面に向けたオイル供
給の検討・考察のみでは不十分であって、摺動面へ向け
た潤滑油の供給量を増加させるだけでなく、摺動面から
の潤滑油の逃げを減少させる工夫も欠くことができない
重要な要素であることは明らかである。 しかるに前記
した第１番目のグループに属する各従来技術において
は、この後者の要素がそれぞれ欠けており、技術的に不
十分なものといわざるを得ない。Regarding the lubricating oil on the thrust sliding end surface of the sintered oil-impregnated bearing, the amount of oil on the sliding surface = (the amount of oil supplied to the sliding surface) − (the escape of oil from the sliding surface) Therefore, it is not enough to study / consider the oil supply to the sliding surface of the thrust end face, and not only to increase the amount of lubricating oil supplied to the sliding surface, It is clear that the device to reduce the escape of lubricating oil is also an essential element. However, in each of the prior arts belonging to the above-mentioned first group, the latter element is lacking, which is technically insufficient.
【０００８】また第２番目の従来技術のものは、軸受け
の材質として孔のない流体軸受けを対象としたものであ
り、これらの技術を軸受け材として多数の気孔を有する
多孔質の焼結含油軸受けに適用したとしても、軸の回転
による軸受けのスラスト摺動端面での潤滑油の連れ込み
作用についてはきわめて弱く、しかも摺動面の油孔から
の油圧の逃げを阻止しきれない結果、摺動面の潤滑に必
要な十分な油膜厚の形成が得られない。The second prior art is directed to a fluid bearing having no holes as the material of the bearing, and a porous sintered oil-impregnated bearing having many pores using these techniques as a bearing material. Even if it is applied to the sliding surface, the effect of entraining the lubricating oil on the thrust sliding end surface of the bearing due to the rotation of the shaft is extremely weak, and the escape of the hydraulic pressure from the oil hole of the sliding surface cannot be prevented, resulting in the sliding surface. It is not possible to obtain a sufficient oil film thickness required for lubrication.
【０００９】さらに前記した第３番目の従来技術による
場合においては、微量のオイル付着の有無等により、例
えば軸端面とワッシャー、あるいはワッシャーとワッシ
ャー、またはワッシャーと軸受け端面等、複数の摺動可
能な面のどの面で摺動するかが変わり、それが予測不可
能であるために、摺動特性に段階的なバラツキを生じや
すい欠点があり、また軸受け端面との間にワッシャーを
装入する際にも、複数のワッシャーを、そのバリ突出の
方向性とワッシャー径の大小の順序を保たせた状態にて
装入作業をおこなう必要があるために、著しく作業性に
劣り、しかもコスト高となるのを免れない。Further, in the case of the third prior art described above, depending on the presence or absence of a small amount of oil adhesion, for example, a plurality of slidable members such as a shaft end face and a washer, a washer and a washer, or a washer and a bearing end face can be slid. Since there is a change in which surface slides and it is unpredictable, there is a drawback that the sliding characteristics tend to vary in stages, and when a washer is inserted between the bearing end surface and In addition, since it is necessary to carry out the charging work with a plurality of washers in a state in which the direction of the burr protrusion and the order of the size of the washer diameter are maintained, the workability is extremely poor and the cost is high. I cannot escape.
【００１０】焼結含油軸受のスラスト軸受端面や、その
摺動相手部材である軸やスラストワッシャーの面は、マ
クロ的には平坦に見えるが、ミクロ的に見るとかなりの
凹凸を有しており、しかもそれらの中間のスケールで見
た場合、僅かなうねりをもった面となっている。 した
がってこのスケールで摺動状態を観察すると、軸受面と
摺動相手面のそれぞれのうねりの高い部分同士が摺動し
合うことになるが、この両面のうねりは、材料の選定や
加工によっては消去しきれないものであり、また偶然的
にコントロールできたとしても再現性が全く期待できな
い。The thrust bearing end surface of the sintered oil-impregnated bearing and the surfaces of the shafts and thrust washers that are sliding counterparts of the sintered oil-impregnated bearing appear to be flat macroscopically, but have considerable irregularities microscopically. Moreover, when viewed on a scale between them, the surface has a slight undulation. Therefore, when observing the sliding condition on this scale, the high undulations of the bearing surface and the sliding mating surface slide against each other, but these undulations are eliminated depending on the material selected and processed. However, even if it could be controlled by chance, reproducibility cannot be expected at all.
【００１１】したがってこの再現性のない表面性状に左
右される焼結含油軸受の、スラスト端面の形成に関して
も、製品として要求される特性レベル（例えば電流値）
において、平均値において満足されても、特性レベルに
達しない製品が必然的に生ずる以上、量産製品として実
用的に生産することはできない。Therefore, regarding the formation of the thrust end surface of the sintered oil-impregnated bearing which is affected by the non-reproducible surface properties, the characteristic level (eg, current value) required as a product is also obtained.
However, even if the average value is satisfied, since a product that does not reach the characteristic level is inevitably produced, it cannot be practically produced as a mass-produced product.
【００１２】[0012]
【課題を解決するための手段】本発明は上記した従来技
術の問題点を解決し、とくにスラスト端面の馴染み特性
を向上させて高スラスト負荷重に耐えることができるよ
うにし、バラツキのない高品質の焼結含油軸受を得るよ
うにしたものであって、具体的には中央に軸孔を有した
圧粉成形焼結金属体であって、該圧粉成形焼結金属体
の、少なくとも一方のスラスト端面にはスラスト外方に
向けた突起部が形成され、スラスト負荷重量に応じて自
動的に最適の摺動面積を形成するようにしたことを特徴
とした焼結含油軸受に関する。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, in particular, makes it possible to improve the familiar characteristic of the thrust end face to withstand a high thrust load weight, and to obtain a high quality without variation. For obtaining a sintered oil-impregnated bearing, specifically, a compacted sintered metal body having a shaft hole in the center, wherein at least one of the compacted sintered metal bodies is The present invention relates to a sintered oil-impregnated bearing characterized in that a projection portion directed to the outside of the thrust is formed on the thrust end face, and an optimum sliding area is automatically formed according to the thrust load weight.
【００１３】また本発明は、中央に軸孔を有した圧粉成
形焼結金属体であって、該圧粉成形焼結金属体の、少な
くとも一方のスラスト端面には、周方向に無端状に連続
する突起部が形成されていることを特徴とした焼結含油
軸受にも関する。According to the present invention, there is also provided a powder compacted sintered metal body having an axial hole in the center, wherein at least one thrust end surface of the powder compacted sintered metal body is endless in the circumferential direction. The present invention also relates to a sintered oil-impregnated bearing characterized in that continuous protrusions are formed.
【００１４】さらに本発明は、中央に軸孔を有した圧粉
成形焼結金属体であって、該圧粉成形焼結金属体の、少
なくとも一方のスラスト端面には、周方向に向けて間欠
的箇所に複数の突起部が形成されていることを特徴とし
た焼結含油軸受にも関する。Further, the present invention is a compacted sintered metal body having an axial hole in the center, wherein at least one thrust end face of the compacted sintered metal body is intermittently formed in the circumferential direction. The present invention also relates to a sintered oil-impregnated bearing, which is characterized in that a plurality of protrusions are formed at the target location.
【００１５】さらに本発明は、中央に軸孔を有した圧粉
成形焼結金属体であって、該圧粉成形焼結金属体の、少
なくとも一方のスラスト端面には、その内径側と外形側
の中間部において外方に突出する突起部を、周方向に無
端状に連続して形成されていることを特徴とした焼結含
油軸受にも関する。Further, the present invention is a compacted sintered metal body having a shaft hole in the center, wherein at least one thrust end surface of the compacted sintered metal body has an inner diameter side and an outer shape side. Also, the present invention relates to a sintered oil-impregnated bearing, characterized in that an outwardly projecting protrusion is formed continuously in an endless manner in the middle part of the above.
【００１６】さらに本発明は、中央に軸孔を有した圧粉
成形焼結金属体であって、該圧粉成形焼結金属体の、少
なくとも一方のスラスト端面には、その内径側と外形側
の中間部において外方に突出する複数の突起部が、周方
向に向けて間欠的箇所に形成されていることを特徴とし
た焼結含油軸受にも関する。Further, the present invention is a compacted sintered metal body having a shaft hole in the center, wherein at least one thrust end surface of the compacted sintered metal body has an inner diameter side and an outer shape side. The present invention also relates to a sintered oil-impregnated bearing characterized in that a plurality of protrusions projecting outward in the middle part of are formed at intermittent locations in the circumferential direction.
【００１７】さらに本発明は、圧粉成形焼結金属体の、
少なくとも一方のスラスト端面に形成した突起部は、そ
の突出上端が、内径側からの立ち上がり線と外径側から
の立ち上がり線とが交差するように形成されているとこ
ろの焼結含油軸受にも関する。Further, the present invention is directed to a compacted sintered metal body,
The protrusion formed on at least one thrust end face also relates to the sintered oil-impregnated bearing in which the protruding upper end is formed so that the rising line from the inner diameter side and the rising line from the outer diameter side intersect. .
【００１８】さらに本発明は、圧粉成形焼結金属体の、
少なくとも一方のスラスト端面に形成した突起部は、そ
の突出高さが０．０１〜０．１（ｍｍ）の範囲内にある
ようにしたものであるところの焼結含油軸受にも関す
る。Furthermore, the present invention is directed to a compacted sintered metal body,
The protrusion formed on at least one thrust end face also relates to a sintered oil-impregnated bearing in which the protrusion height is in the range of 0.01 to 0.1 (mm).
【００１９】さらに本発明は、金属粉を圧粉成型して中
央に軸孔を有するとともに、少なくとも一方のスラスト
端面に、周方向無端状若しくは間欠的にに連続する突起
部を有する圧粉体を得る工程と、該圧粉体を焼結・サイ
ジング・油浸する各工程とからなり、上記圧粉体を得る
工程における突起部の形成は、完成時に予定する突起部
より突出高さを大きめにし、焼結後にこれを加圧して予
定突出高さに矯正するようにしたことを特徴とする焼結
含油軸受の製造方法にも関する。Further, according to the present invention, there is provided a green compact having a shaft hole in the center formed by compacting a metal powder, and at least one thrust end surface having an endless portion in the circumferential direction or an intermittently continuous projection portion. The step of obtaining, and the step of sintering, sizing, and oil-immersing the green compact are performed. The protrusion is formed in the step of obtaining the green compact by making the protrusion height larger than the projection to be completed at the time of completion. The present invention also relates to a method for manufacturing a sintered oil-impregnated bearing, which is characterized in that after sintering, it is pressed to correct it to a projected height.
【００２０】さらに本発明は、金属粉を圧粉成型して中
央に軸孔を有するとともに、少なくとも一方のスラスト
端面に、周方向無端状若しくは間欠的に連続する突起部
を有する圧粉体を得る工程と、該圧粉体を焼結・サイジ
ング・油浸する各工程とからなり、圧粉成形によって形
成した周方向無端状の突起部の間欠的箇所を焼結後に加
圧し、あるいは圧粉成形によって形成した間欠的に連続
する突起部がサイジング後も突起部として残るように焼
結後に加圧して、周方向に向けた複数の突起部を形成す
るようにしたことを特徴とする焼結含油軸受の製造方法
にも関する。Further, according to the present invention, a metal powder is compacted to obtain a compact having an axial hole in the center and at least one thrust end face having a projection endless in the circumferential direction or intermittently continuous. It consists of a process and each process of sintering, sizing, and oil immersion of the green compact, and presses the intermittent part of the circumferential endless projection formed by compaction molding after sintering or compacting A sintered oil-impregnated product, characterized in that a plurality of protrusions oriented in the circumferential direction are formed by pressurizing after sintering so that the intermittently continuous protrusions formed by the method remain as protrusions even after sizing. It also relates to a method of manufacturing a bearing.
【００２１】上記した構成において、これを摺動回転機
器の回転軸受として用いた場合に、スラスト端面に形成
されたところの、周方向に無端状若しくは間欠的に連続
して形成された突起部が、回転するスラスト軸端、ある
いはこれとの間に介在されたスラストワッシャーと接触
し、次第に突起部先端の摩耗が進行してある程度摩耗し
たところで初期馴染みが完了する。In the above-mentioned structure, when this is used as a rotary bearing of a sliding rotary machine, a projection formed on the thrust end face, which is endless or circumferentially continuous, is formed. The initial familiarization is completed when the rotating thrust shaft end or the thrust washer interposed between the thrust shaft end and the rotating thrust shaft end comes into contact, and the tip of the protrusion gradually wears and wears to some extent.
【００２２】[0022]
【発明の実施の形態】以下において本発明の具体的な内
容を図面に基づいて説明すると、図１には本発明の一実
施例である焼結含油軸受の、回転軸に対する装着例があ
らわされている。 同図において、１は回転軸４の一端
に装着された軸受をあらわし、その一方のスラスト側端
部には外周方向に鍔状に突出させたスラスト軸受部２が
形成され、しかも該軸受部２のスラスト側端面、すなわ
ち軸受１のスラスト端面には外方に突出させたところ
の、周方向に無端状に連続する突起部３が形成されてい
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of mounting a sintered oil-impregnated bearing, which is an embodiment of the present invention, on a rotary shaft. ing. In FIG. 1, reference numeral 1 denotes a bearing mounted on one end of a rotary shaft 4, and at one end on the thrust side thereof, a thrust bearing portion 2 projecting like a flange in the outer peripheral direction is formed. On the thrust-side end surface of the bearing, that is, the thrust end surface of the bearing 1, there is formed an outwardly protruding projection 3 which is endless and continuous in the circumferential direction.
【００２３】この突起部３は、圧粉成型焼結金属体から
なる含油軸受のスラスト端面における、内径側と外形側
の中間部において外方に突出するように形成され、しか
もその突出上端３ａが、軸受１の内径側からの立ち上が
り線Ｘと外径側からの立ち上がり線Ｙとが交差するよう
にして突起部３の先端が軸受１のスラスト端に接するス
ラスト軸５の端面に対して線接触するように角部が形成
されている。 また突起部３の突出高さについては、軸
受の内径または外径側の、いずれかの面とり位置より
０．０１（ｍｍ）未満であると、本願発明の予定する効
果があまり期待できず、また反対に０．１（ｍｍ）を越
えると潤滑油の供給が不完全となるおそれがあるので、
０．０１〜０．１（ｍｍ）の範囲内とするのが最も理想
的といえる。The projecting portion 3 is formed so as to project outward at an intermediate portion between the inner diameter side and the outer shape side of the thrust end surface of the oil-impregnated bearing made of a powder compacted sintered metal body, and the projecting upper end 3a thereof is formed. Line contact with the end surface of the thrust shaft 5 in which the tip of the protrusion 3 contacts the thrust end of the bearing 1 such that the rising line X from the inner diameter side of the bearing 1 and the rising line Y from the outer diameter side intersect. Corners are formed so that Further, with respect to the protruding height of the protrusion 3, if the inner diameter or the outer diameter of the bearing is less than 0.01 (mm) from any chamfered position, the effect expected by the present invention cannot be expected so much. On the other hand, if it exceeds 0.1 (mm), the supply of lubricating oil may be incomplete.
It can be said that the most ideal value is in the range of 0.01 to 0.1 (mm).
【００２４】このような焼結含油軸受を用いた場合、軸
受１はその経時的使用により、内径壁面が回転軸４に対
して次第にラジアル方向の馴染みを生ずるばかりでな
く、スラスト端面の突起部３の突出上端３ａがスラスト
軸５の端面に接し、スラスト軸５からの図１における矢
印方向からの負荷重を受けた場合に、当初は線接触であ
ったものが、次第に突出上端３ａに摩耗を生じて図２に
あらわしたように、立ち上がり線Ｘと立ち上がり線Ｙと
の交差がなくなって円弧状につながり、スラスト軸５と
の間に馴染みを生じ、これによって潤滑油の十分な滲出
を得て安定的で、しかも耐荷重を有する理想的な軸受を
構成することができる。When such a sintered oil-impregnated bearing is used, the bearing 1 not only causes the inner diameter wall surface to gradually become familiar with the rotating shaft 4 in the radial direction, but also the protrusion 3 of the thrust end surface. When the projecting upper end 3a of the above contacts the end surface of the thrust shaft 5 and receives a load load from the thrust shaft 5 in the direction of the arrow in FIG. 1, what was initially line contact gradually wears out the projecting upper end 3a. As shown in FIG. 2, the rising line X and the rising line Y do not intersect each other and are connected in an arc shape to form a familiarity with the thrust shaft 5, thereby obtaining sufficient leaching of the lubricating oil. It is possible to construct an ideal bearing that is stable and has a withstand load.
【００２５】この場合において、軸受けのスラスト端面
に対するスラスト負荷重が比較的小さい場合には、馴染
みが完了するまでに比較的多くの時間を要する。 また
上記した馴染み時間の短縮を含め、馴染み時間の一層の
短縮化が望まれる場合には、突起部の形成をむしろ周方
向に無端状に形成するのではなく、間欠的箇所に形成す
る方が有利である。 すなわち軸受け端面に、スラスト
外方に向けた突起部を周方向に無端状に形成する場合に
おいても、馴染み時間を短くするために、上記した環状
の突起部先端を無限小の摺動面積にすることは、図面上
において可能であったとしても、実際の軸受けの製造に
おいては、材料が粉末であるところから、粉末の粒径よ
りも小さな先端形状の突起部を周方向に向けて無端状に
形成することは極めて困難である。In this case, if the thrust load on the thrust end face of the bearing is relatively small, it takes a relatively long time to complete the familiarization. In addition, if it is desired to further shorten the familiarizing time, including the shortening of the familiarizing time described above, it is better to form the protrusions at intermittent locations rather than forming them endlessly in the circumferential direction. It is advantageous. That is, even in the case where a thrust outwardly projecting portion is formed endlessly in the circumferential direction on the bearing end surface, the end of the annular projecting portion described above has an infinitely small sliding area in order to shorten the familiarizing time. Even if it is possible in the drawing, in the actual manufacturing of the bearing, since the material is powder, the tip-shaped protrusion smaller than the particle size of the powder is endlessly oriented in the circumferential direction. It is extremely difficult to form.
【００２６】さらに加えて上記の先端形状を有する突起
部形成用の金型作成精度上の限界、あるいは工具の精度
上の問題からそれほど極端な馴染み時間の短縮を望むこ
とはできない。 したがって馴染み時間をより一層短縮
化するには、前記した突起部の先端部を、できるだけ小
さな摺動面積からスタートさせるのが望ましく、そのた
めには、前記した突起部を、周方向無端状ではなしに、
周方向に向けて間欠的箇所に形成するのがよい。In addition, it is not possible to expect a drastic reduction in the familiarizing time because of the limit of the precision of forming a mold for forming the protrusion having the above-mentioned tip shape or the problem of the precision of the tool. Therefore, in order to further shorten the acclimatization time, it is desirable to start the tip of the above-mentioned protrusion from a sliding area as small as possible. For that purpose, the above-mentioned protrusion is not endless in the circumferential direction. ,
It is preferable to form them at intermittent locations in the circumferential direction.
【００２７】つぎに上記した突起部の形成方法について
図３〜４にあらわした別の焼結含油軸受の成型過程をも
とに説明すると、焼結含油軸受は一般的に圧粉成型工程
・焼結工程・サイジング（矯正加工）工程・油浸工程を
経て製造される。 そこで本発明にあっては、まず圧粉
成型工程において、図３にあらわしたように金属粉を圧
粉して圧粉体１１を成型する。 この圧粉体１１は、中
央に軸孔１２を有するとともに、該圧粉体１１の内径ま
たは外径側の、いずれかの面とり位置１１ａ・１１ｂを
基準としたスラスト端面に、上記面とり位置１１ａ・１
１ｂより少なくとも０．１（ｍｍ）を上回る高さ１３ａ
・１３ｂの、完成時に予定する突起部２４ａ・２４ｂよ
り突出高さを大きめにしたところの、周方向無端状に連
続する突起部１４ａ・１４ｂを有する。Next, the method of forming the above-mentioned protrusions will be described based on the molding process of another sintered oil-impregnated bearing shown in FIGS. It is manufactured through a binding process, sizing process, and oil immersion process. Therefore, in the present invention, first, in the powder compacting step, the metal powder is compacted to mold the green compact 11 as shown in FIG. The green compact 11 has a shaft hole 12 in the center, and the chamfered position is formed on the thrust end face on the inner diameter or outer diameter side of the green compact 11 with reference to one of the chamfered positions 11a and 11b. 11a ・ 1
Height 13a that is at least 0.1 (mm) higher than 1b
The protrusion 13a has protrusions 14a and 14b which are continuous in an endless circumferential direction in which the protrusion height is made larger than the protrusions 24a and 24b which are planned at the time of completion.
【００２８】圧粉成型された圧粉体１１は、周知の焼結
工程によりこれを焼結し、その後上記焼結体１１のスラ
スト側に形成されている突起部１４ａ・１４ｂを公知の
加圧手段により加圧して、圧粉体２１の内径または外径
側の、いずれかの面とり位置２１ａ・２１ｂを基準とし
た予定突出高さ２３ａ・２３ｂとなるように矯正して、
あらかじめ予定した突起部２４ａ・２４ｂを形成し（図
４参照）、これによって突起部２４ａ・２４ｂにおけ
る、特にワッシャーあるいはスラスト軸端と接触する突
出山頂付近の密度を上昇させて強度を増す。The green compact 11 formed by green compacting is sintered by a well-known sintering process, and then the protrusions 14a and 14b formed on the thrust side of the sintered body 11 are pressed by a well-known presser. It is pressed by means to correct the inner diameter or the outer diameter side of the green compact 21 so that the projected heights 23a and 23b on the basis of either of the chamfered positions 21a and 21b are obtained.
Preliminarily designed projections 24a and 24b are formed (see FIG. 4), thereby increasing the density of the projections 24a and 24b, particularly near the protruding peaks that come into contact with the washer or thrust shaft end, and increase the strength.
【００２９】さらにこれをサイジング工程および油浸工
程を経て目的とする焼結含油軸受を製造することができ
る。 なおこの場合の油浸工程については、例えば上記
した図４にあらわされている加圧成型後の圧粉成形焼結
金属体に対して真空法または加熱法等の手法によって潤
滑油を含浸させることができる。 また周方向間欠的箇
所に突起部を形成する場合においても、同様に成型過程
において圧粉体のスラスト端面に、周方向に無端状に連
続させた突起部を形成するとともに、焼結後のサイジン
グにおいて、上記無端状の突起部に対して、その周方向
に向けて一定または不定間隔毎に公知のパンチ等の加圧
手段によって切れ目を入れ、あるいは圧粉成形によって
形成した間欠的に連続する突起部が、サイジング後も突
起部として残るように焼結後に加圧し、結果的に周方向
間欠的箇所に突出した突起部を形成する。Furthermore, the desired sintered oil-impregnated bearing can be manufactured by subjecting this to a sizing step and an oil immersion step. Regarding the oil immersion process in this case, for example, impregnating the pressed powder-molded sintered metal body after pressure molding shown in FIG. 4 with a lubricating oil by a method such as a vacuum method or a heating method. You can Also, in the case of forming protrusions at intermittent locations in the circumferential direction, similarly, in the molding process, the thrust end surface of the green compact is formed with endless continuous protrusions in the circumferential direction and sizing after sintering. In the above-mentioned endless projection, intermittently continuous projections formed by making a cut by a known pressing means such as a punch or the like at constant or indefinite intervals in the circumferential direction, or by powder compaction. The portion is pressed after sintering so that it remains as a protrusion even after sizing, and as a result, a protrusion protruding at an intermittent portion in the circumferential direction is formed.
【００３０】[0030]
【発明の効果】本発明は上記した通り、中央に軸孔を有
した圧粉成形焼結金属体であって、該圧粉成形焼結金属
体の、少なくとも一方のスラスト端面には、スラスト外
方に向けたところの周方向に無端状に連続し、あるいは
周方向に向けて間欠的箇所に形成した突起部が形成さ
れ、スラスト負荷重量に応じて自動的に最適の摺動面積
を形成するようにしたために、これを摺動回転機器の回
転軸受として用いた場合に、スラスト端面に形成された
ところの、周方向に無端状に連続する突起部が、回転す
るスラスト軸端との間に介在されたスラストワッシャー
と接触し、次第に突起部先端の摩耗が進行してある程度
摩耗したところで初期馴染みが自動的に、しかも速やか
に完了し、とくにスラスト端面の馴染み特性を向上させ
ることができる。As described above, the present invention provides a compacted sintered metal body having an axial hole in the center, wherein at least one thrust end surface of the compacted sintered metal body has a thrust outer surface. Endlessly continuous in the circumferential direction toward the one side, or projections formed at intermittent points in the circumferential direction are formed, and an optimum sliding area is automatically formed according to the thrust load weight. Therefore, when this is used as a rotary bearing of a sliding rotary device, a projection that is formed on the thrust end face and that is endless in the circumferential direction is between the rotating thrust shaft end. The initial familiarity is completed automatically and quickly when the tip end of the protrusion gradually wears due to contact with the interposed thrust washer, and the familiarity characteristic of the thrust end face can be improved.
【００３１】また、上記突起部を有する焼結含油軸受を
製造するに際し、金属粉を圧粉成型して中央に軸孔を有
するとともに、少なくとも一方のスラスト端面に、周方
向無端状に連続し、若しくは間欠的に形成された突起部
を有する圧粉体を得る工程と、該圧粉体を焼結・サイジ
ング・油浸する各工程とからなり、上記圧粉体を得る工
程における突起部の形成は、完成時に予定する突起部よ
り突出高さを大きめにし、焼結後にこれを加圧して予定
突出高さに矯正するようにしたために、突起部における
特に突出先端部付近が高密度化して補強される結果、高
スラスト負荷重に耐え、しかもバラツキのない高品質の
焼結含油軸受を得ることができる。Further, in manufacturing the sintered oil-impregnated bearing having the above-mentioned protrusion, metal powder is compacted to have a shaft hole in the center, and at least one thrust end face is continuously endless in the circumferential direction, Alternatively, the step of obtaining a green compact having protrusions formed intermittently and the steps of sintering, sizing, and oil-immersing the green compact, and forming the protrusions in the step of obtaining the green compact Is designed to have a larger protruding height than the projected portion at the time of completion, and it is pressed after sintering to correct it to the expected projected height. As a result, it is possible to obtain a high-quality sintered oil-impregnated bearing that can withstand a high thrust load and has no variations.
【００３２】また、圧粉成形焼結金属体の、少なくとも
一方のスラスト端面に形成される、突起部が、周方向に
向けて間欠的箇所に形成されているものである場合にお
いては、馴染み時間の一層の短縮化をはかることができ
る。Also, in the case where the projection formed on at least one thrust end surface of the powder compacted sintered metal body is formed at intermittent locations in the circumferential direction, the familiarizing time Can be further shortened.
【図１】本発明の一実施例である含油軸受の装着状態を
あらわすところの、要部拡大縦断面図。FIG. 1 is an enlarged vertical sectional view of an essential part showing a mounted state of an oil-impregnated bearing which is an embodiment of the present invention.
【図２】第１図に示した含油軸受の馴染み後の状態をあ
らわした要部拡大縦断面図。FIG. 2 is an enlarged vertical sectional view of an essential part showing the state of the oil-impregnated bearing shown in FIG.
【図３】本発明に係る別の焼結含油軸受の製造の一過程
である圧粉体の、中央部を裁断してあらわした拡大断面
図。FIG. 3 is an enlarged cross-sectional view showing the green compact by cutting the central portion, which is one process of manufacturing another sintered oil-impregnated bearing according to the present invention.
【図４】図３の圧粉体を加圧矯正工程を経て成型した圧
粉体の、同じく中央部を裁断してあらわした拡大断面
図。FIG. 4 is an enlarged cross-sectional view showing a green compact of the green compact of FIG. 3 that has been molded through a pressure straightening step, similarly cut.
１ 軸受 ２ スラスト軸受部 ３ 突起部 ３ａ 突出上端 ４ 回転軸 ５ スラスト軸 １１ 圧粉体 １２ 軸穴 １１ａ 面とり位置 １１ｂ 面とり位置 １２ 軸穴 １３ａ 上回る高さ １３ｂ 上回る高さ １４ａ 突起部 １４ｂ 突起部 ２１ 圧粉体 ２１ａ 面とり位置 ２１ｂ 面とり位置 ２２ 軸穴 ２３ａ 予定突出高さ ２３ｂ 予定突出高さ ２４ａ 突起部 ２４ｂ 突起部 DESCRIPTION OF SYMBOLS 1 Bearing 2 Thrust bearing part 3 Projection part 3a Projecting upper end 4 Rotating shaft 5 Thrust shaft 11 Powder compact 12 Shaft hole 11a Chamfering position 11b Chamfering position 12 Shaft hole 13a Exceeding height 13b Exceeding height 14a Projection part 14b Projecting part 21 Powder compact 21a Chamfering position 21b Chamfering position 22 Shaft hole 23a Planned projecting height 23b Plane projecting height 24a Projection 24b Projection
Claims (9)
あって、該圧粉成形焼結金属体の、少なくとも一方のス
ラスト端面にはスラスト外方に向けた突起部が形成さ
れ、スラスト負荷重量に応じて自動的に最適の摺動面積
を形成するようにしたことを特徴とした焼結含油軸受。1. A compacted sintered metal body having a shaft hole in the center, wherein at least one thrust end surface of the compacted sintered metal body is provided with a projection portion directed toward the outside of the thrust. The sintered oil-impregnated bearing is characterized in that the optimum sliding area is automatically formed according to the thrust load weight.
あって、該圧粉成形焼結金属体の、少なくとも一方のス
ラスト端面には、周方向に無端状に連続する突起部が形
成されていることを特徴とした焼結含油軸受。2. A powder compacted sintered metal body having a shaft hole in the center, wherein at least one thrust end face of the powder compacted sintered metal body is a projection which is endlessly continuous in the circumferential direction. A sintered oil-impregnated bearing characterized in that a portion is formed.
あって、該圧粉成形焼結金属体の、少なくとも一方のス
ラスト端面には、周方向に向けて間欠的箇所に複数の突
起部が形成されていることを特徴とした焼結含油軸受。3. A powder compacted sintered metal body having an axial hole in the center, wherein at least one thrust end face of the powder compacted sintered metal body is provided at intermittent locations in the circumferential direction. A sintered oil-impregnated bearing characterized in that a plurality of protrusions are formed.
あって、該圧粉成形焼結金属体の、少なくとも一方のス
ラスト端面には、その内径側と外径側の中間部において
スラスト外方に突出する突起部を、周方向に無端状に連
続させて形成されていることを特徴とした焼結含油軸
受。4. A compacted sintered metal body having an axial hole in the center, wherein at least one thrust end face of the compacted sintered metal body is an intermediate portion between the inner diameter side and the outer diameter side. A sintered oil-impregnated bearing characterized in that a protrusion protruding outward in the thrust portion is formed continuously in an endless manner in the circumferential direction.
あって、該圧粉成形焼結金属体の、少なくとも一方のス
ラスト端面には、その内径側と外形側の中間部において
外方に突出する複数の突起部が、周方向に向けて間欠的
箇所に形成されていることを特徴とした焼結含油軸受。5. A powder compacted sintered metal body having an axial hole in the center, wherein at least one thrust end face of the powder compacted sintered metal body has an intermediate portion between its inner diameter side and outer shape side. In the sintered oil-impregnated bearing, a plurality of protrusions projecting outward are formed at intermittent locations in the circumferential direction.
スラスト端面に形成した突起部は、その突出上端が、内
径側からの立ち上がり線と外径側からの立ち上がり線と
が交差するように形成されているところの請求項４また
は請求項５に記載の焼結含油軸受。6. A protrusion formed on at least one thrust end face of a powder compacted sintered metal body, the protrusion upper end of which intersects a rising line from the inner diameter side and a rising line from the outer diameter side. The sintered oil-impregnated bearing according to claim 4 or 5, wherein the sintered oil-impregnated bearing is formed.
スラスト端面に形成した突起部は、その突出高さが０．
０１〜０．１（ｍｍ）の範囲内にあるようにしたもので
あるところの請求項４、請求項５または請求項６に記載
の焼結含油軸受。7. A protrusion formed on at least one thrust end surface of a powder compacted sintered metal body has a protrusion height of 0.
The sintered oil-impregnated bearing according to claim 4, claim 5 or claim 6, wherein the sintered oil-impregnated bearing is in a range of 01 to 0.1 (mm).
とともに、少なくとも一方のスラスト端面に、周方向無
端状若しくは間欠的に連続する突起部を有する圧粉体を
得る工程と、該圧粉体を焼結・サイジング・油浸する各
工程とからなり、上記圧粉体を得る工程における突起部
の形成は、完成時に予定する突起部より突出高さを大き
めにし、焼結後にこれを加圧して予定突出高さに矯正す
るようにしたことを特徴とする焼結含油軸受の製造方
法。8. A step of compacting a metal powder to obtain a compact having an axial hole in the center and at least one thrust end surface having a projection endless in the circumferential direction or intermittently continuous. The step of forming the protrusion in the step of obtaining the green compact is performed by sintering the sizing, sizing, and immersing the green compact in a step of making the protrusion height larger than the protrusion expected at the time of completion. A method for manufacturing a sintered oil-impregnated bearing, characterized in that the pressure is applied to correct the projected height.
とともに、少なくとも一方のスラスト端面に、周方向無
端状若しくは間欠的に連続する突起部を有する圧粉体を
得る工程と、該圧粉体を焼結・サイジング・油浸する各
工程とからなり、圧粉成形によって形成した周方向無端
状の突起部の間欠的箇所を焼結後に加圧し、あるいは圧
粉成形によって形成した間欠的に連続する突起部がサイ
ジング後も突起部として残るように焼結後に加圧して、
周方向に向けた複数の突起部を形成するようにしたこと
を特徴とする焼結含油軸受の製造方法。9. A step of obtaining a green compact having a shaft hole at the center and at least one thrust end surface having a projection endless in the circumferential direction or intermittently continuous, which is formed by compacting a metal powder. The step of sintering, sizing, and oil-immersing the green compact is carried out, and intermittent portions of the circumferentially endless projections formed by green compacting are pressed after sintering or formed by green compacting. Pressing after sintering so that the intermittently continuous protrusions remain as protrusions even after sizing,
A method for manufacturing a sintered oil-impregnated bearing, characterized in that a plurality of projections oriented in the circumferential direction are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9761596A JPH09264326A (en) | 1996-03-27 | 1996-03-27 | Oil-impregnated sintered bearing, and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9761596A JPH09264326A (en) | 1996-03-27 | 1996-03-27 | Oil-impregnated sintered bearing, and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09264326A true JPH09264326A (en) | 1997-10-07 |
Family
ID=14197117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9761596A Pending JPH09264326A (en) | 1996-03-27 | 1996-03-27 | Oil-impregnated sintered bearing, and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09264326A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1306566A2 (en) * | 2001-10-23 | 2003-05-02 | Johnson Electric S.A. | Electric motor |
| JP2006183756A (en) * | 2004-12-27 | 2006-07-13 | Mitsubishi Materials Pmg Corp | Oil-impregnated sintered bearing and method for manufacturing the same |
| JP2014082846A (en) * | 2012-10-15 | 2014-05-08 | Asmo Co Ltd | Motor |
| WO2016147925A1 (en) * | 2015-03-17 | 2016-09-22 | Ntn株式会社 | Method for manufacturing sintered bearing, and sintered bearing |
| JP2016173138A (en) * | 2015-03-17 | 2016-09-29 | Ntn株式会社 | Sintered bearing |
| JP2016172900A (en) * | 2015-03-17 | 2016-09-29 | Ntn株式会社 | Method for manufacturing sintered bearing, and sintered bearing |
| JP2016208603A (en) * | 2015-04-17 | 2016-12-08 | キヤノン電子株式会社 | Rotary drive device, stepping motor and electronic apparatus |
| JP2019052767A (en) * | 2018-12-18 | 2019-04-04 | Ntn株式会社 | Sintered bearing and power transmission mechanism with the same |
-
1996
- 1996-03-27 JP JP9761596A patent/JPH09264326A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1306566A2 (en) * | 2001-10-23 | 2003-05-02 | Johnson Electric S.A. | Electric motor |
| US6867519B2 (en) | 2001-10-23 | 2005-03-15 | Johnson Electric S.A. | Electric motor |
| CN100392950C (en) * | 2001-10-23 | 2008-06-04 | 德昌电机股份有限公司 | Electric motor |
| JP2006183756A (en) * | 2004-12-27 | 2006-07-13 | Mitsubishi Materials Pmg Corp | Oil-impregnated sintered bearing and method for manufacturing the same |
| JP2014082846A (en) * | 2012-10-15 | 2014-05-08 | Asmo Co Ltd | Motor |
| JP2016173138A (en) * | 2015-03-17 | 2016-09-29 | Ntn株式会社 | Sintered bearing |
| WO2016147925A1 (en) * | 2015-03-17 | 2016-09-22 | Ntn株式会社 | Method for manufacturing sintered bearing, and sintered bearing |
| JP2016172900A (en) * | 2015-03-17 | 2016-09-29 | Ntn株式会社 | Method for manufacturing sintered bearing, and sintered bearing |
| CN107407332A (en) * | 2015-03-17 | 2017-11-28 | Ntn株式会社 | The manufacture method and sintered bearing of sintered bearing |
| US10697496B2 (en) | 2015-03-17 | 2020-06-30 | Ntn Corporation | Sintered bearing |
| US11454282B2 (en) | 2015-03-17 | 2022-09-27 | Ntn Corporation | Sintered bearing |
| JP2016208603A (en) * | 2015-04-17 | 2016-12-08 | キヤノン電子株式会社 | Rotary drive device, stepping motor and electronic apparatus |
| JP2019052767A (en) * | 2018-12-18 | 2019-04-04 | Ntn株式会社 | Sintered bearing and power transmission mechanism with the same |
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