JPH06221324A - Oil-retaining bearing - Google Patents
Oil-retaining bearingInfo
- Publication number
- JPH06221324A JPH06221324A JP1193193A JP1193193A JPH06221324A JP H06221324 A JPH06221324 A JP H06221324A JP 1193193 A JP1193193 A JP 1193193A JP 1193193 A JP1193193 A JP 1193193A JP H06221324 A JPH06221324 A JP H06221324A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- bearing
- shaft body
- end surface
- lubricating oil
- 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
- Sliding-Contact Bearings (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、動圧スラスト軸受とし
て使用される焼結願油軸受などの含油軸受に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-impregnated bearing such as a sintered oil bearing used as a dynamic pressure thrust bearing.
【０００２】[0002]
【従来の技術】含油軸受の多くは、粉末冶金法による焼
結含油軸受である。焼結含油軸受は、多孔質の金属焼結
体に潤滑油を含浸させたものである。そして、軸体の回
転時には、含油軸受の気孔内に含まれた潤滑油が軸体と
含油軸受との摺動部にしみ出して潤滑作用を行うもので
ある。焼結含油軸受は、基本的にラジアルすべり軸受で
あり、筒状になっていて、内側に軸体を回転摺動自在に
支持するものである。しかし、軸体に一体的に設けられ
た鍔が、含油軸受の端面へ軸方向の荷重を加える場合が
ある。摩擦熱などにより含油軸受の端面と軸体の鍔との
間にも潤滑油はしみ出すが、含油軸受の端面が平坦であ
ると潤滑油の誘出効果は薄い。しかも、含油軸受の端面
と軸体の鍔との間の潤滑油は含油軸受の端面へ開口した
気孔へ逃避しやすく、潤滑効果が下がる。これを防止す
るには、バニシングや研磨などにより含油軸受の端面の
気孔を封孔することが考えられるが、ほとんど全ての気
孔を封孔してしまえば、もとより潤滑油がしみ出さなく
なる。いずれにせよ、含油軸受の端面が平坦であると、
十分な潤滑効果が得られないが、潤滑効果が低ければ、
抵抗も増大し、磨耗、損傷が生じやすくなる。2. Description of the Related Art Most of oil-impregnated bearings are sintered oil-impregnated bearings manufactured by powder metallurgy. The sintered oil-impregnated bearing is obtained by impregnating a porous metal sintered body with lubricating oil. When the shaft body rotates, the lubricating oil contained in the pores of the oil-impregnated bearing exudes to the sliding portion between the shaft body and the oil-impregnated bearing to perform a lubricating action. The sintered oil-impregnated bearing is basically a radial slide bearing, has a cylindrical shape, and supports a shaft body in a rotatable and slidable manner inside. However, the flange integrally provided on the shaft body may apply a load in the axial direction to the end surface of the oil-impregnated bearing. Lubricating oil exudes between the end surface of the oil-impregnated bearing and the flange of the shaft body due to frictional heat, but if the end surface of the oil-impregnated bearing is flat, the effect of inducing the lubricating oil is small. Moreover, the lubricating oil between the end surface of the oil-impregnated bearing and the flange of the shaft body easily escapes to the pores opened to the end surface of the oil-impregnated bearing, and the lubricating effect is reduced. In order to prevent this, it is conceivable to seal the pores on the end surface of the oil-impregnated bearing by burnishing or polishing, but if almost all the pores are sealed, the lubricating oil will not leak out. In any case, if the end surface of the oil-impregnated bearing is flat,
Not enough lubrication effect can be obtained, but if the lubrication effect is low,
Resistance also increases, and wear and damage easily occur.
【０００３】これに対して、焼結含油軸受において、大
きな軸方向の荷重に抗するために、従来より、端面にワ
ッシャなどの補強材を固定する構造も採られている。し
かし、これは、製造上、工数が増すとともに、部品点数
も多くなり、コストアップを招く。また、軸体と軸受と
は軸方向において直接接触するので、抵抗の増大、損傷
の発生などの問題はやはり生じる。On the other hand, in a sintered oil-impregnated bearing, in order to withstand a large axial load, a structure in which a reinforcing material such as a washer is fixed to the end face has been conventionally adopted. However, this increases man-hours in manufacturing and also increases the number of parts, resulting in cost increase. Further, since the shaft body and the bearing are in direct contact with each other in the axial direction, problems such as increase in resistance and occurrence of damage still occur.
【０００４】[0004]
【発明が解決しようとする課題】前述のように、軸体の
鍔などから大きな軸方向の荷重が加わる焼結含油軸受に
おいて、その平坦な端面に封孔処理を施さなくても、端
面全体に封孔処理を施しても、潤滑油による十分な潤滑
効果が得られず、抵抗の増大、磨耗、損傷の発生などの
問題をきたす。また、大きな軸方向の荷重に抗するため
に、軸受の端面にワッシャなどの補強材を固定する前記
従来の構造では、製造上不利であるとともに、やはり抵
抗の増大、損傷の発生などの問題は解決できなかった。As described above, in a sintered oil-impregnated bearing to which a large axial load is applied from the flange of the shaft body or the like, even if the flat end surface is not subjected to sealing treatment, the entire end surface is covered. Even if the sealing treatment is performed, a sufficient lubricating effect cannot be obtained by the lubricating oil, which causes problems such as an increase in resistance, wear and damage. Further, in the above-mentioned conventional structure in which a reinforcing material such as a washer is fixed to the end surface of the bearing in order to resist a large axial load, it is disadvantageous in manufacturing, and problems such as increase in resistance and occurrence of damage are also caused. I couldn't solve it.
【０００５】本発明は、このような問題点を解決しよう
とするもので、簡単な構造で確実に軸方向の荷重に抗す
ることができるとともに、軸体の回転時の抵抗の増大や
磨耗、損傷も生じない含油軸受を提供することを目的と
する。The present invention is intended to solve such a problem and is capable of reliably resisting a load in the axial direction with a simple structure, and at the same time, increases the resistance during rotation of the shaft body, wear, and the like. An object is to provide an oil-impregnated bearing that does not cause damage.
【０００６】[0006]
【課題を解決するための手段】本発明は、前記目的を達
成するために、軸体を回転自在に支持する筒状の含油軸
受において、前記軸体から軸方向の荷重を受ける端面
に、内周および外周から前記軸体の回転方向へ向かって
尖った楔状の凹部および凸部を前記回転方向に並べて交
互に形成したものである。In order to achieve the above-mentioned object, the present invention provides a cylindrical oil-impregnated bearing for rotatably supporting a shaft body, in which an end face receiving an axial load from the shaft body Wedge-shaped concave portions and convex portions sharpened from the circumference and the outer circumference toward the rotation direction of the shaft body are arranged alternately in the rotation direction.
【０００７】[0007]
【作用】本発明の含油軸受は、筒状で、軸体を回転自在
に支持するものであり、軸体の回転時、気孔内に含まれ
た潤滑油が軸体との摺動部にしみ出して潤滑作用を行
う。特に、軸体から軸方向の荷重を受ける端面におい
て、しみ出した潤滑油は、端面の内周および外周から軸
体の回転方向へ向かって尖った楔状の凹部および凸部に
より、その尖った先端部の方へ案内され、凸部の先端部
で油圧が高まり、その結果、この凸部と軸体との間に油
膜が確実に介在し、軸受と軸体とが直接接触しない。The oil-impregnated bearing of the present invention is cylindrical and rotatably supports the shaft body. When the shaft body rotates, the lubricating oil contained in the pores smears on the sliding portion with the shaft body. Take it out and perform lubrication. In particular, at the end face that receives an axial load from the shaft, the lubricating oil that has exuded can have a sharp tip due to the wedge-shaped recesses and protrusions that are sharp from the inner and outer peripheries of the end face toward the rotation direction of the shaft. The oil pressure is increased at the tip of the convex portion as a result of being guided toward the portion, and as a result, the oil film is surely interposed between the convex portion and the shaft body, and the bearing and the shaft body do not come into direct contact with each other.
【０００８】[0008]
【実施例】以下、本発明の含油軸受の一実施例につい
て、図面を参照しながら説明する。本実施例の含油軸受
は、焼結含油軸受１であり、ほぼ円筒状に形成された金
属焼結体の気孔に潤滑油を含浸させたものである。ま
た、両端面２，３の内周部および外周部には、それぞれ
面取り部４，５，６，７が形成されている。そして、本
軸受１は、ファンモーターなどに利用され、内側に軸体
11を回転摺動自在に支持するものであるが、この軸体11
に一体的に設けられた鍔12から前記一端面２へ軸方向の
荷重が加わるものである。この一端面２には、その内周
および外周から軸体11の回転方向ａへ向かって尖った楔
状の凹部16および凸部17が前記回転方向ａに並べて交互
に形成されている。軸受１全体の長さが約12mm、外径が
約８mmであるのに対して、凹部16に対する凸部17の高さ
は、約３〜30μm 程度である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the oil-impregnated bearing of the present invention will be described below with reference to the drawings. The oil-impregnated bearing of this embodiment is a sintered oil-impregnated bearing 1, which is obtained by impregnating pores of a substantially cylindrical metal sintered body with lubricating oil. Further, chamfered portions 4, 5, 6, 7 are formed on the inner peripheral portion and the outer peripheral portion of both end surfaces 2, 3, respectively. The bearing 1 is used for a fan motor, etc., and has a shaft body inside.
This shaft body 11 supports so that it can rotate and slide freely.
An axial load is applied to the one end surface 2 from the flange 12 that is integrally provided in the. Wedge-shaped concave portions 16 and convex portions 17 that are sharpened from the inner circumference and the outer circumference toward the rotation direction a of the shaft body 11 are alternately formed on the one end surface 2 side by side in the rotation direction a. The entire length of the bearing 1 is about 12 mm and the outer diameter is about 8 mm, while the height of the convex portion 17 with respect to the concave portion 16 is about 3 to 30 μm.
【０００９】つぎに、前記軸受１の製造方法について、
簡単に説明する。まず、原料粉末を粉末成形プレスによ
り圧縮して圧粉体を成形する（粉末成形工程）。つい
で、この圧粉体を焼結炉で加熱して焼結する（焼結工
程）。ついで、この焼結後の焼結体を矯正プレスにより
再圧縮して、所定の寸法、形状に仕上げる（矯正工
程）。この矯正工程において、前記凹部16および凸部17
を形成する。すなわち、矯正用金型のパンチの端面に対
応する凸部および凹部を形成しておくことにより、軸受
１の端面２に凹部16および凸部17を形成する。ついで、
軸受１の同端面２にバニシング加工を施す。すなわち、
バニシ工具を軸受１の端面２の凸部17に当てて回転させ
ることにより、この端面２を擦る。このバニシングによ
り、凸部17の表面へ開口した気孔は封孔される。ただ
し、凸部17の表面への気孔を全て封孔するのではなく、
半分程度を封孔するようにする。これに対して、凹部16
の表面へ開口した気孔は、封孔されない。さらに、軸受
１の気孔内に潤滑油を含浸させる（含浸工程）。Next, regarding the method of manufacturing the bearing 1,
Briefly explained. First, the raw material powder is compressed by a powder molding press to mold a green compact (powder molding step). Next, this green compact is heated in a sintering furnace and sintered (sintering step). Then, the sintered body after the sintering is recompressed by a straightening press to finish into a predetermined size and shape (straightening step). In this correction step, the concave portion 16 and the convex portion 17
To form. That is, the concave portion 16 and the convex portion 17 are formed on the end surface 2 of the bearing 1 by forming the convex portion and the concave portion corresponding to the end surface of the punch of the straightening die. Then,
The end face 2 of the bearing 1 is burnished. That is,
The end face 2 is rubbed by applying a burnishing tool to the convex portion 17 of the end face 2 of the bearing 1 and rotating it. By this burnishing, the pores opened to the surface of the convex portion 17 are sealed. However, instead of sealing all the pores on the surface of the convex portion 17,
Try to seal about half. On the other hand, the recess 16
Pores that open to the surface of are not sealed. Further, lubricating oil is impregnated into the pores of the bearing 1 (impregnation step).
【００１０】使用時、軸体11は、矢印ａで示す方向への
み回転する。この回転時、軸受１の気孔内に含まれた潤
滑油が軸受１と軸体11との摺動部にしみ出して潤滑作用
を行う。特に、軸体11の鍔12から軸方向の荷重を受ける
端面２において、しみ出した潤滑油は、端面２の内周お
よび外周から軸体11の回転方向ａへ向かって尖った楔状
の凹部16および凸部17により、その尖った先端部の方へ
案内され、凸部17の先端部で油圧が高まる。こうして生
じる動圧のために、凸部17と軸体11の鍔12との間に油膜
が確実に介在し、軸受１と軸体11とが直接接触しない。
このとき、潤滑油は、端面２において封孔されていない
凹部16から主にしみ出し、ある程度の封孔がなされてい
る凸部17においては、潤滑油が軸受１の気孔内に逃避し
てしまうことはほとんどない。In use, the shaft 11 rotates only in the direction indicated by the arrow a. During this rotation, the lubricating oil contained in the pores of the bearing 1 seeps out to the sliding portion between the bearing 1 and the shaft body 11 to perform a lubricating action. Particularly, on the end surface 2 that receives a load in the axial direction from the collar 12 of the shaft body 11, the lubricating oil that has exuded is wedge-shaped recessed portion 16 that is sharpened from the inner circumference and the outer circumference of the end surface 2 toward the rotation direction a of the shaft body 11. Further, the convex portion 17 guides it toward the pointed tip portion, and the hydraulic pressure increases at the tip portion of the convex portion 17. Due to the dynamic pressure thus generated, the oil film is surely interposed between the convex portion 17 and the flange 12 of the shaft body 11, and the bearing 1 and the shaft body 11 do not come into direct contact with each other.
At this time, the lubricating oil mainly exudes from the recessed portion 16 which is not sealed on the end face 2 and escapes into the pores of the bearing 1 at the convex portion 17 which is sealed to some extent. Almost never.
【００１１】以上のように、前記実施例の構成によれ
ば、焼結含油軸受１における軸方向の荷重が加わる端面
２に、軸体11の回転方向ａへ向かって尖った楔状の凹部
16および凸部17を形成したので、これら凹部16および凸
部17による潤滑油の案内によって、確実に動圧を生じさ
せて、軸受１を軸体11の鍔12から軸方向において浮き上
がらせることができる。しかも、凸部17の表面はバニシ
ングによりある程度の封孔処理を施したのに対して、凹
部16の表面は封孔していないので、この凹部16へ開口し
た気孔より十分な量の潤滑油がしみ出し、一方、鍔12と
の間に油膜を生じるべき凸部17では、気孔への潤滑油の
逃避が抑えられることにより、よりいっそう確実に動圧
が働く。したがって、軸体11の回転時の抵抗を低減でき
るとともに、磨耗、損傷の発生も抑えられる。また、製
造上も、矯正工程において、軸受１の端面２に凹部16お
よび凸部17を形成し、その後、同じ端面にバニシング加
工を施すので、製造が容易であり、コストもかさまな
い。As described above, according to the structure of the above-described embodiment, the wedge-shaped recess sharpened in the rotational direction a of the shaft body 11 is formed on the end surface 2 of the sintered oil-impregnated bearing 1 to which the axial load is applied.
Since the concave portions 16 and the convex portions 17 are formed, the lubricating oil is guided by the concave portions 16 and the convex portions 17, so that the dynamic pressure can be surely generated and the bearing 1 can be lifted from the flange 12 of the shaft body 11 in the axial direction. it can. Moreover, the surface of the convex portion 17 is subjected to a certain degree of sealing treatment by burnishing, whereas the surface of the concave portion 16 is not sealed, so that a sufficient amount of lubricating oil is provided from the pores opened to the concave portion 16. On the other hand, in the convex portion 17 where the oil film exudes from the exudation and the collar 12, the escape of the lubricating oil to the pores is suppressed, so that the dynamic pressure is exerted more reliably. Therefore, it is possible to reduce the resistance of the shaft 11 when rotating, and to suppress the occurrence of wear and damage. Further, also in manufacturing, since the concave portion 16 and the convex portion 17 are formed on the end surface 2 of the bearing 1 in the straightening step, and then the same end surface is burnished, the manufacturing is easy and the cost is low.
【００１２】なお、本発明は、前記実施例に限定される
ものではなく、種々の変形実施が可能である。例えば、
凹部および凸部は、軸受の一方の軸方向端面にのみ形成
してもよいし、あるいは、両方の軸方向端面に形成して
もよい。軸受全体の形状も、前記実施例のものに限定さ
れない。The present invention is not limited to the above embodiment, and various modifications can be made. For example,
The concave portion and the convex portion may be formed on only one axial end surface of the bearing, or may be formed on both axial end surfaces. The shape of the entire bearing is not limited to that of the above embodiment.
【００１３】[0013]
【発明の効果】本発明によれば、含油軸受において、こ
れが支持する軸体から軸方向の荷重を受ける端面に、内
周および外周から軸体の回転方向へ向かって尖った楔状
の凹部および凸部を前記回転方向に並べて交互に形成し
たので、凹部および凸部による潤滑油の案内によって動
圧が確実に生じ、軸受の端面と軸体との直接接触を確実
に防止でき、これにより、軸体の回転時の抵抗を低減で
きるとともに、磨耗、損傷の発生も抑えられる。また、
構造が簡単で、製造も容易であり、コストもかさまな
い。According to the present invention, in an oil-impregnated bearing, wedge-shaped recesses and protrusions sharpened in the rotation direction of the shaft body from the inner circumference and the outer circumference are formed on the end face of the oil bearing which receives a load in the axial direction. Since the parts are arranged side by side in the rotational direction and alternately formed, the dynamic pressure is reliably generated by the guide of the lubricating oil by the recesses and the projections, and the direct contact between the end surface of the bearing and the shaft can be reliably prevented. The resistance when the body rotates can be reduced, and wear and damage can be suppressed. Also,
It has a simple structure, is easy to manufacture, and is inexpensive.
【図１】本発明の含油軸受の一実施例を示す端面の正面
図である。FIG. 1 is a front view of an end surface showing an embodiment of an oil-impregnated bearing according to the present invention.
【図２】同上図１のＡ−Ａ断面図である。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】同上全体の縦断面図である。FIG. 3 is a vertical sectional view of the same as above.
１ 焼結含油軸受（含油軸受） ２ 端面 11 軸体 16 凹部 17 凸部 1 Sintered oil-impregnated bearing (oil-impregnated bearing) 2 End face 11 Shaft body 16 Recessed portion 17 Convex portion
Claims (1)
受において、前記軸体から軸方向の荷重を受ける端面
に、内周および外周から前記軸体の回転方向へ向かって
尖った楔状の凹部および凸部を前記回転方向に並べて交
互に形成したことを特徴とする含油軸受。1. A cylindrical oil-impregnated bearing that rotatably supports a shaft body, wherein an end face that receives a load in the axial direction from the shaft body has a wedge shape that is sharpened from the inner circumference and the outer circumference toward the rotation direction of the shaft body. The oil-impregnated bearing characterized in that the concave portions and the convex portions of are formed alternately in line in the rotation direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01193193A JP3623521B2 (en) | 1993-01-27 | 1993-01-27 | Sintered metal oil-impregnated bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01193193A JP3623521B2 (en) | 1993-01-27 | 1993-01-27 | Sintered metal oil-impregnated bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06221324A true JPH06221324A (en) | 1994-08-09 |
| JP3623521B2 JP3623521B2 (en) | 2005-02-23 |
Family
ID=11791427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01193193A Expired - Lifetime JP3623521B2 (en) | 1993-01-27 | 1993-01-27 | Sintered metal oil-impregnated bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3623521B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5810479A (en) * | 1996-03-08 | 1998-09-22 | Hitachi Powdered Metals Co., Ltd. | Hydrodynamic thrust porous bearing |
| US6211592B1 (en) | 1999-03-29 | 2001-04-03 | Nidec Corporation | Motor for driving storage disks |
| JP2006118594A (en) * | 2004-10-21 | 2006-05-11 | Hitachi Powdered Metals Co Ltd | Dynamic pressure bearing and its manufacturing method |
-
1993
- 1993-01-27 JP JP01193193A patent/JP3623521B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5810479A (en) * | 1996-03-08 | 1998-09-22 | Hitachi Powdered Metals Co., Ltd. | Hydrodynamic thrust porous bearing |
| US6211592B1 (en) | 1999-03-29 | 2001-04-03 | Nidec Corporation | Motor for driving storage disks |
| JP2006118594A (en) * | 2004-10-21 | 2006-05-11 | Hitachi Powdered Metals Co Ltd | Dynamic pressure bearing and its manufacturing method |
| JP4573349B2 (en) * | 2004-10-21 | 2010-11-04 | 日立粉末冶金株式会社 | Manufacturing method of hydrodynamic bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3623521B2 (en) | 2005-02-23 |
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