JPH0819941B2 - Sintered oil-impregnated bearing - Google Patents
Sintered oil-impregnated bearingInfo
- Publication number
- JPH0819941B2 JPH0819941B2 JP62184240A JP18424087A JPH0819941B2 JP H0819941 B2 JPH0819941 B2 JP H0819941B2 JP 62184240 A JP62184240 A JP 62184240A JP 18424087 A JP18424087 A JP 18424087A JP H0819941 B2 JPH0819941 B2 JP H0819941B2
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- bearing
- rotary shaft
- bearing hole
- support portion
- 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.)
- Expired - Fee Related
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
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
- F16C33/103—Construction relative to lubrication with liquid, e.g. oil, as lubricant retained in or near the bearing
- F16C33/104—Construction relative to lubrication with liquid, e.g. oil, as lubricant retained in or near the bearing in a porous body, e.g. oil impregnated sintered sleeve
-
- 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
- F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
- F16C23/02—Sliding-contact bearings
- F16C23/04—Sliding-contact bearings self-adjusting
- F16C23/041—Sliding-contact bearings self-adjusting with edge relief
-
- 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
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
- F16C33/128—Porous bearings, e.g. bushes of sintered alloy
-
- 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
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
-
- 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
- F16C2202/00—Solid materials defined by their properties
- F16C2202/02—Mechanical properties
- F16C2202/10—Porosity
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、焼結合金により形成された軸受本体に、回
転軸が挿通される軸受孔が形成された焼結含油軸受に関
する。Description: TECHNICAL FIELD The present invention relates to a sintered oil-impregnated bearing in which a bearing main body made of a sintered alloy is formed with a bearing hole into which a rotary shaft is inserted.
焼結合金で形成し、潤滑油を含浸させて使用する焼結
含油軸受は、無給油で長期間使用できることから、各種
機器の回転軸の軸受として広く用いられている。BACKGROUND ART Sintered oil-impregnated bearings formed of a sintered alloy and used by being impregnated with a lubricating oil are widely used as bearings for rotating shafts of various devices because they can be used for a long time without lubrication.
ところで、この種の焼結含油軸受において、その軸受
孔内に挿通された回転軸を所定位置に確実に位置合わせ
して支持しようとする場合には、例えば、軸受孔の一部
において支持する形態にして、回転軸と接触する部分を
狭くするようにしている。By the way, in this type of sintered oil-impregnated bearing, when the rotary shaft inserted in the bearing hole is to be surely aligned and supported at a predetermined position, for example, a mode of supporting it in a part of the bearing hole In this way, the part that comes into contact with the rotating shaft is narrowed.
〔発明が解決しようとする問題点〕 しかしながら、上記のように焼結含油軸受の、回転軸
と接触する部分の軸線方向の長さを短くすると、回転軸
の支持状態が不安定になり易く、回転軸が振れてその軸
心がずれ易いという問題がある。[Problems to be Solved by the Invention] However, when the length of the sintered oil-impregnated bearing in contact with the rotary shaft in the axial direction is shortened as described above, the supporting state of the rotary shaft tends to be unstable, There is a problem in that the rotating shaft swings and its axis tends to shift.
本発明は、上記事情に鑑みてなされたもので、その目
的とするところは、回転軸との摩擦係数を極めて低くす
ることができると共に、回転軸を確実に支持することが
でき、回転軸の軸心のずれを極力抑制できる焼結含油軸
受を提供することにある。The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to extremely reduce the coefficient of friction with the rotating shaft and to reliably support the rotating shaft. An object of the present invention is to provide a sintered oil-impregnated bearing capable of suppressing the deviation of the shaft center as much as possible.
上記目的を達成するために、本発明の第１のものは、
軸受本体に形成された軸受孔を、回転軸を支持する軸支
部と、この軸支部に連なり、かつ外方に向かって径が広
がる拡径部とから構成すると共に、上記拡径部を上記軸
支部より密に形成したものである。In order to achieve the above object, the first aspect of the present invention comprises:
The bearing hole formed in the bearing body is composed of a shaft supporting portion that supports the rotating shaft and a diameter expanding portion that is continuous with the shaft supporting portion and that expands outward in diameter. It is formed more densely than the branch.
また、本発明の第２のものは、軸受本体に形成された
軸受孔を、回転軸を支持する軸支部と、この軸支部に連
なり、かつ外方に向かって径が広がる一対の拡径部とか
ら構成すると共に、上記一方の拡径部を上記軸支部より
密に形成する一方、上記他方の拡径部を上記軸支部より
粗に形成したものである。A second aspect of the present invention is that a bearing hole formed in a bearing main body is provided with a shaft supporting portion that supports a rotating shaft, and a pair of enlarged diameter portions that are connected to the shaft supporting portion and that have a diameter that expands outward. And one of the expanded diameter portions is formed more densely than the shaft support portion, while the other expanded diameter portion is formed more coarsely than the shaft support portion.
本発明の焼結含油軸受にあっては、回転軸を軸受孔の
軸支部において回転自在に支持すると共に、軸受本体に
含浸させた潤滑油を拡径部と回転軸との間隙に満たして
おき、回転軸にその軸心をずらそうとする力が加わった
場合に、上記潤滑油によって回転軸の心ずれを抑制す
る。In the sintered oil-impregnated bearing of the present invention, the rotary shaft is rotatably supported by the shaft support portion of the bearing hole, and the lubricating oil impregnated in the bearing body is filled in the gap between the expanded diameter portion and the rotary shaft. When the force for shifting the axis of the rotary shaft is applied, the lubricating oil suppresses the misalignment of the rotary shaft.
以下、第１図ないし第４図に基づいて本発明の実施例
を説明する。An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.
第１図は本発明の第１実施例を示す断面図であり、こ
の図において、符号１は、焼結合金により形成された円
筒状の軸受本体である。この軸受本体１の内部には、回
転軸２が挿通される軸受孔３が形成されている。そし
て、この軸受孔３は、その軸線に直交する面内における
断面形状が円形に形成されたものである。また、上記軸
受孔３は、上記回転軸２の径より若干大きく、かつ該回
転軸２を回転自在に支持する軸支部3aと、この軸支部3a
に連なり、かつ外方に向かって孔径が広がる拡径部3b
と、上記軸支部3aに連なる面取り部3cとから構成されて
いる。そして、上記拡径部3bは上記軸支部3aより密に形
成されている。FIG. 1 is a sectional view showing a first embodiment of the present invention. In this drawing, reference numeral 1 is a cylindrical bearing body formed of a sintered alloy. A bearing hole 3 into which the rotary shaft 2 is inserted is formed inside the bearing body 1. The bearing hole 3 has a circular cross-sectional shape in a plane orthogonal to its axis. The bearing hole 3 is slightly larger than the diameter of the rotary shaft 2 and supports the rotary shaft 2 rotatably, and the shaft support 3a.
Expanded portion 3b that is continuous with the hole and the hole diameter expands outward
And a chamfer 3c connected to the shaft support 3a. The expanded diameter portion 3b is formed more densely than the shaft support portion 3a.
上記のように構成された軸受は、内部に潤滑油が含浸
されて使用され、回転軸２がその軸受孔３に挿通されて
回転する。この時、回転軸２は、その外周面が上記軸支
部3aで支持される。そして、回転軸２にその軸線に直交
する方向に力が加わった場合には、回転軸２が振れて心
ずれを生じようとするが、この場合、拡径部3bが軸支部
3aに比べて密に形成されているから、拡径部3bと回転軸
２との間に介在せしめられた潤滑油が回転軸２の振れを
確実に抑えて、心ずれが防止される。すなわち、回転軸
２の振れ方向にある潤滑油は回転軸２に押されて拡径部
3b側に押し付けられるが、拡径部3bが密に形成されてい
るから、潤滑油が拡径部3bから軸受本体１内に侵入する
のを抑制し、従って、この潤滑油が回転軸２を支持する
機能を発揮する。The bearing configured as described above is used by being impregnated with lubricating oil inside, and the rotating shaft 2 is inserted into the bearing hole 3 and rotates. At this time, the outer peripheral surface of the rotary shaft 2 is supported by the shaft support portion 3a. When a force is applied to the rotary shaft 2 in a direction orthogonal to the axis of the rotary shaft 2, the rotary shaft 2 swings and tends to cause misalignment.
Since it is formed more densely than 3a, the lubricating oil interposed between the expanded diameter portion 3b and the rotary shaft 2 reliably suppresses the runout of the rotary shaft 2 and prevents misalignment. That is, the lubricating oil in the runout direction of the rotary shaft 2 is pushed by the rotary shaft 2 and the enlarged diameter portion
Although it is pressed against the 3b side, since the expanded diameter portion 3b is densely formed, it prevents the lubricating oil from entering the bearing main body 1 from the expanded diameter portion 3b, and thus this lubricating oil causes the rotation shaft 2 to move. Demonstrate the function of supporting.
また、第２図は本発明の第２実施例を示すもので、本
実施例においては、軸受孔４は、回転軸２を支持する軸
支部4aと、この軸支部4aに連なり、かつ外方に向かって
孔径が広がる一対の拡径部4b,4cとから構成されてい
る。そして、上記各拡径部4b,4cを、ともに上記軸支部4
aより密に形成すれば、上記第１実施例の回転軸２の心
ずれ抑制効果がさらに高められる。Further, FIG. 2 shows a second embodiment of the present invention. In this embodiment, the bearing hole 4 is connected to the shaft supporting portion 4a for supporting the rotating shaft 2 and the shaft supporting portion 4a, It is composed of a pair of enlarged diameter portions 4b, 4c whose hole diameter is widened toward. Then, each of the expanded diameter portions 4b and 4c is connected to the shaft support portion 4 together.
If it is formed more densely than a, the effect of suppressing the misalignment of the rotary shaft 2 of the first embodiment can be further enhanced.
また、一方の拡径部4b（4c）を軸支部4aより密に、か
つ他方の拡径部4c（4b）を軸支部4aより粗に形成した場
合には、軸支部4aより密に形成した拡径部4b（4c）によ
り上述したような心ずれ抑制効果が得られる上に、軸支
部4aより粗に形成した拡径部4c（4b）によって、軸支部
4aから該拡径部4c（4b）側に流れた潤滑油を軸受本体１
内に戻すことができ、この潤滑油を再度軸支部4aに供給
できて、軸受としての寿命を延ばすことができる。Further, when the one expanded diameter portion 4b (4c) is denser than the shaft supporting portion 4a and the other expanded diameter portion 4c (4b) is coarser than the shaft supporting portion 4a, it is formed more densely than the shaft supporting portion 4a. The expanded diameter portion 4b (4c) provides the above-described effect of suppressing the misalignment, and the expanded diameter portion 4c (4b) formed more coarsely than the axial support portion 4a allows the axial support portion to be supported.
The lubricating oil that has flowed from 4a to the enlarged diameter portion 4c (4b) side is used for the bearing body 1
It can be returned to the inside, and this lubricating oil can be supplied to the shaft support portion 4a again, and the life of the bearing can be extended.
なお、上記各実施例における粗密の調整は、焼結工程
後の矯正（再加圧）工程において、加圧圧縮を加減する
ことにより行なう。The adjustment of the density in each of the above-described examples is performed by adjusting the pressure and compression in the straightening (repressurizing) step after the sintering step.
なおまた、上記各実施例においては、軸受孔の横断面
形状が円形状のもので説明したが、これに限らず、例え
ば、第３図に示すように、多角形状の軸受孔５、あるい
は、第４図に示すように、多角形状の各隅部に凹所6aを
形成した軸受孔６を用いてもよい。これらの場合には、
上述した効果の上に、さらに回転軸２との接触が線接触
となって回転軸２との摩擦係数が大幅に低下するという
効果を奏する。In each of the above embodiments, the bearing hole has a circular cross-sectional shape, but the shape is not limited to this. For example, as shown in FIG. 3, a polygonal bearing hole 5 or As shown in FIG. 4, a bearing hole 6 in which a recess 6a is formed at each corner of a polygon may be used. In these cases,
In addition to the above-described effects, the contact with the rotary shaft 2 becomes a line contact, and the friction coefficient with the rotary shaft 2 is significantly reduced.
以上説明したように、本発明は、軸受本体に形成され
た軸受孔を、回転軸を支持する軸支部と、この軸支部と
に連なり、かつ外方に向かって径が広がる拡径部とから
構成すると共に、上記拡径部を上記軸支部より密に形成
したものであるから、回転軸を軸受孔の軸支部において
回転自在に支持すると共に、軸受本体に含浸させた潤滑
油を拡径部と回転軸との間隙に満たしておき、回転軸に
その軸心をずらそうとする力が加わった場合に、上記潤
滑油によって回転軸の心ずれを抑制することにより、回
転軸との摩擦係数を極めて低くすることができると共
に、回転軸を確実に支持することができ、回転軸の軸心
のずれを極力抑制できるという効果を有する。また、軸
受本体に形成された軸受孔を、回転軸を支持する軸支部
と、この軸支部に連なり、かつ外方に向って径が広がる
一対の拡径部とから構成すると共に、上記一方の拡径部
を上記軸支部より密に形成する一方、上記他方の拡径部
が上記軸支部より粗に形成したものであるから、上記軸
支部より密に形成した一方の拡径部により、上述したの
と同様の効果を奏すると共に、上記軸支部より粗に形成
した他方の拡径部により、回転軸と軸支部との間から流
出した潤滑油を軸受本体に戻して、再度軸支部に供給す
ることによって、回転軸との摩擦係数が低い軸受として
の機能を長期間にわたって維持することができる。As described above, according to the present invention, the bearing hole formed in the bearing main body is formed from the shaft supporting portion that supports the rotating shaft and the enlarged diameter portion that is continuous with the shaft supporting portion and has a diameter that expands outward. Since the expanded diameter portion is formed more densely than the shaft support portion, the rotary shaft is rotatably supported by the shaft support portion of the bearing hole and the lubricating oil impregnated into the bearing body is expanded. The gap between the rotating shaft and the rotating shaft is filled, and when a force to shift the rotating shaft is applied to the rotating shaft, the lubricating oil suppresses the misalignment of the rotating shaft, and the friction coefficient with the rotating shaft is reduced. It is possible to make the rotation angle extremely low, to reliably support the rotating shaft, and to suppress the deviation of the axis of the rotating shaft as much as possible. In addition, the bearing hole formed in the bearing body is composed of a shaft supporting portion that supports the rotating shaft and a pair of enlarged diameter portions that are continuous with the shaft supporting portion and have a diameter that expands outwardly. While the enlarged diameter portion is formed more densely than the shaft supporting portion, the other enlarged diameter portion is formed more coarsely than the shaft supporting portion, so that the one enlarged diameter portion formed denser than the shaft supporting portion causes In addition to the same effect as described above, the other enlarged diameter portion that is coarser than the shaft support portion returns the lubricating oil that has flowed out between the rotary shaft and the shaft support portion to the bearing body and supplies it again to the shaft support portion. By doing so, the function as a bearing having a low friction coefficient with the rotating shaft can be maintained for a long period of time.
【図面の簡単な説明】 第１図は本発明の第１実施例を示す断面図、第２図は本
発明の第２実施例を示す断面図、第３図は軸受孔の他の
一例を示す平面図、第４図は軸受孔の別の一例を示す平
面図である。 １……軸受本体、２……回転軸、３……軸受孔、3a……
軸支部、3b……拡径部、４……軸受孔、4a……軸支部、
4b,4c……拡径部、５……軸受孔、６……軸受孔。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view showing a second embodiment of the present invention, and FIG. 3 is another example of a bearing hole. FIG. 4 is a plan view showing another example of the bearing hole. 1 …… Bearing body, 2 …… Rotary shaft, 3 …… Bearing hole, 3a ……
Shaft support part, 3b ... Expanded part, 4 ... Bearing hole, 4a ... Shaft support part,
4b, 4c …… Expansion part, 5 …… Bearing hole, 6 …… Bearing hole.
Claims (2)
転軸が挿通される軸受孔が形成された焼結含油軸受にお
いて、上記軸受孔が、上記回転軸を支持する軸支部と、
この軸支部に連なり、かつ外方に向かって径が広がる拡
径部とから構成されると共に、上記拡径部が上記軸支部
より密に形成されたことを特徴とする焼結含油軸受。1. A sintered oil-impregnated bearing having a bearing main body made of a sintered alloy and a bearing hole through which a rotary shaft is inserted, wherein the bearing hole has a shaft supporting portion for supporting the rotary shaft,
A sintered oil-impregnated bearing characterized in that it is composed of an enlarged diameter portion that is continuous with the shaft support portion and has a diameter that expands outward, and that the enlarged diameter portion is formed more closely than the shaft support portion.
転軸が挿通される軸受孔が形成された焼結含油軸受にお
いて、上記軸受孔が、その中間部に設けられ、かつ上記
回転軸を支持する軸支部と、この軸支部に連なり、かつ
外方に向って径が広がる一対の拡径部とから構成される
と共に、上記一方の拡径部が上記軸支部より密に形成さ
れる一方、上記他方の拡径部が上記軸支部より粗に形成
されたことを特徴とする焼結含油軸受。2. A sintered oil-impregnated bearing having a bearing main body made of a sintered alloy and a bearing hole through which the rotary shaft is inserted, wherein the bearing hole is provided in an intermediate portion thereof, and the rotary shaft is provided. And a pair of enlarged diameter portions that are continuous with the axial support portion and that expand in diameter outwardly, and the one enlarged diameter portion is formed more densely than the axial support portion. On the other hand, a sintered oil-impregnated bearing in which the other expanded diameter portion is formed to be rougher than the shaft support portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62184240A JPH0819941B2 (en) | 1987-07-23 | 1987-07-23 | Sintered oil-impregnated bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62184240A JPH0819941B2 (en) | 1987-07-23 | 1987-07-23 | Sintered oil-impregnated bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6430922A JPS6430922A (en) | 1989-02-01 |
| JPH0819941B2 true JPH0819941B2 (en) | 1996-03-04 |
Family
ID=16149835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62184240A Expired - Fee Related JPH0819941B2 (en) | 1987-07-23 | 1987-07-23 | Sintered oil-impregnated bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0819941B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016172900A (en) * | 2015-03-17 | 2016-09-29 | Ntn株式会社 | Method for manufacturing sintered bearing, and sintered bearing |
| WO2018074515A1 (en) | 2016-10-18 | 2018-04-26 | 株式会社ダイヤメット | Oil-impregnated sintered bearing and production method therefor |
| WO2018079670A1 (en) | 2016-10-26 | 2018-05-03 | 株式会社ダイヤメット | Oil-impregnated sintered bearing |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0435651U (en) * | 1990-07-18 | 1992-03-25 | ||
| JPH10131967A (en) * | 1996-10-25 | 1998-05-22 | Seiko Epson Corp | Bearing and motor |
| WO2004090360A1 (en) * | 2003-04-02 | 2004-10-21 | Mitsubishi Materials Corporation | Oil-impregnated sintered bearing and method of producing the same |
-
1987
- 1987-07-23 JP JP62184240A patent/JPH0819941B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016172900A (en) * | 2015-03-17 | 2016-09-29 | Ntn株式会社 | Method for manufacturing sintered bearing, and sintered bearing |
| WO2018074515A1 (en) | 2016-10-18 | 2018-04-26 | 株式会社ダイヤメット | Oil-impregnated sintered bearing and production method therefor |
| US10731704B2 (en) | 2016-10-18 | 2020-08-04 | Diamet Corporation | Oil-impregnated sintered bearing and production method therefor |
| WO2018079670A1 (en) | 2016-10-26 | 2018-05-03 | 株式会社ダイヤメット | Oil-impregnated sintered bearing |
| US10865828B2 (en) | 2016-10-26 | 2020-12-15 | Diamet Corporation | Oil-impregnated sintered bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6430922A (en) | 1989-02-01 |
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