US20020090157A1 - Rolling-bearing and bearing unit - Google Patents
Rolling-bearing and bearing unit Download PDFInfo
- Publication number
- US20020090157A1 US20020090157A1 US10/029,419 US2941901A US2002090157A1 US 20020090157 A1 US20020090157 A1 US 20020090157A1 US 2941901 A US2941901 A US 2941901A US 2002090157 A1 US2002090157 A1 US 2002090157A1
- Authority
- US
- United States
- Prior art keywords
- races
- bearing
- rolling
- raceway
- particles
- 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.)
- Abandoned
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 41
- 239000002344 surface layer Substances 0.000 claims abstract description 13
- 238000011109 contamination Methods 0.000 abstract description 15
- 239000002245 particle Substances 0.000 description 32
- 239000002131 composite material Substances 0.000 description 19
- 238000005498 polishing Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 15
- 238000005406 washing Methods 0.000 description 14
- 238000005461 lubrication Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000003754 machining Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000012993 chemical processing Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 238000007517 polishing process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000010365 information processing Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 239000006061 abrasive grain Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- F16C33/58—Raceways; Race rings
- F16C33/62—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
- F16C33/58—Raceways; Race rings
- F16C33/64—Special methods of manufacture
-
- 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
- F16C2235/00—Cleaning
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S451/00—Abrading
- Y10S451/901—Super finish
Definitions
- This invention relates to a rolling-bearing and a bearing unit that are used in fields such as information-processing equipment, aerospace, airplane and semiconductors.
- Japanese patent publication No. Toku Kai Sho 62-24956 proposes a method of using lapping tape coated with cubic boron nitride (CBN) abrasive grain to lap the raceway groove (raceway surface).
- CBN cubic boron nitride
- Japanese patent publication No, Toku Kai Hei 3-84218 proposes a method of finish-grinding the circumferential seal groove of the races simultaneously when finish-grinding the inner-raceway surface and outer-raceway surface, using the same grinding abrasive.
- rolling bearings having very high resistance to wear, low generation of dust particles, good resistance to damage, and good acoustical characteristics, as well a having low degradation due to vibration and little change in torque are desired.
- having low generation of dust particles (reduction of contamination) in rolling bearings that are used in information-processing devices such as hard disc drives (HDD), or in aerospace devices such as artificial satellites is in great demand.
- Development of rolling bearings that will satisfy this strict demand is desired.
- FIG. 1 is a cross sectional view to show part of a bearing in a first embodiment of the present invention.
- FIG. 2 is a cross sectional view to show part of a bearing in a second embodiment of the present invention.
- FIG. 3 (A) and FIG. 3 (B) are a flow chart to explain the production steps of the present invention.
- FIG. 4 is a graph to compare an example of the present invention with a comparative example.
- the rolling bearing of this invention comprises races having a raceway and rolling elements having a rolling contact surface; and a surface layer is formed on at least the raceway of the races by machining at least the surface of raceway and dissolving the machined surface electrochemically or chemically to form the surface layer.
- Electrolytic polishing, chemical polishing, composite electrolytic polishing or composite chemical polishing can be given as examples of the method of electrochemically or chemically dissolving the machined surface.
- the machined surface be super-finished before performing electrochemical or chemical processing.
- the surface layer is formed by electrochemically or chemically dissolving the machined surface of at least the raceway of the races. Particularly, by forming surface layers over the entire races by machining the entire races and then electrochemically or chemically dissolving the machined surfaces, contamination is removed, and thus it is possible to further improve the reduction of contamination.
- this invention removes contamination by electrochemically or chemically dissolving minute particles (contamination) such as abrasive that remains on the machined surfaces of the races.
- minute particles such as abrasive that remains on the machined surfaces of the races.
- this invention is applied to a method of manufacturing a rolling bearing comprising races having a raceway, and rolling elements having a rolling contact surface, for example, it is possible to perform grinding and then super-finishing on the surface of the raceway, then form the surface layer on at least the raceway of the races by electrochemically or chemically dissolving the machined surface, and then wash the races before assembling the races with the other parts of the bearing.
- the rolling bearing of this invention is most suitable for use in information-pressing devices such as a HDD or in rotating parts in artificial satellites.
- rotating parts in artificial satellites include: flywheels, expansion mechanisms and motor for solar-battery paddles, antenna expansion mechanisms, actuators for docking mechanisms, and robot arm manipulators, radiometer, switches, etc.
- a feature of this invention in the case of a rolling-bearing unit comprising a rotating shaft of a flywheel for attitude control of an artificial satellite and a rolling bearing provided for supporting the rotating shaft and having races formed with a raceway and rolling elements formed with rolling surfaces, wherein a machined surface is formed on at least the raceway of the races and a surface layer is formed on the machined surface by electrochemically or chemically dissolving the machined surface.
- FIG. 1 shows a first embodiment of the rolling bearing (angular ball bearing) 10 comprising an inner race 11 , outer race 12 , a plurality of balls 13 that are located between the inner and outer races 11 , 12 , and a retainer 14 for holding balls 13 at uniform intervals around in the circumferential direction.
- the inner and outer races 11 , 12 and the balls 13 are made of martensite stainless steel (SUS440C) or the like.
- a groove 15 that functions as the inner-ring raceway is formed on the outer peripheral surface of the inner race 11
- a groove 16 that functions as the outer-ring raceway is formed on the inner peripheral surface of the outer race 12 .
- This embodiment is directed to a rolling bearing for the flywheel for attitude control of an artificial satellite.
- the entire surfaces of the inner races 11 and outer races 12 are machined, specifically super-finished, and surface layers 11 a , 12 a are formed over the entire super-finished surfaces of the inner race 11 and outer race 12 by electrochemically or chemically dissolving the super-finished surfaces, so very little contamination occurs.
- FIG. 2 shows the rolling bearing 20 of a second embodiment of the invention.
- surface layers 23 a are also formed over the entire surfaces of the balls 23 by machining the entire surfaces and then electrochemically or chemically dissolving the machined surfaces.
- FIG. 3(A) shows the manufacturing procedure for the rolling bearing of this invention.
- FIG. 3(B) shows the manufacturing procedure for a conventional rolling bearing.
- composite electrolytic polishing is performed after super-finishing has been performed on the grooves. It is preferable that oil be removed using acetone or the like before performing composite electrolytic polishing. Even when there is a retaining period between the super-finishing process and composite electrolytic polishing process, there is no need for special care such as immersion-storing the races (work) in order to prevent them from drying.
- composite electrolytic polishing is performed for the entire surfaces of the inner and outer races, that is the outer-diameter surface, inner-diameter surface, raceway surfaces, seal groove, and all chamfered sections. When doing this, it is preferred that the roughness of the processed surfaces Rmax be 0.3 ⁇ m or less.
- a bearing outer race made of SUS440C was prepared and composite electrolytic polishing was performed for it. After a suitable amount of particles were made to adhere to the surface, the outer race was washed. Washing was performed by immersing the outer race in a clean solution and then irradiating it with supersonic waves. After each specified interval of supersonic irradiation, the particles having a size of 1 ⁇ m or greater and that were released into the solution were counted by a particle counter in the solution.
- the surface roughness Rmax of the outer race for which the composite electrolytic polishing process was performed was 0.3 ⁇ m for the inner-diameter surface and outer-diameter surface, and 0.27 ⁇ m for the end surfaces.
- a bearing outer race made of SUS440C was prepared without composite electrolytic polishing performed for it. After a suitable amount of particles were made to adhere to the surface, the outer race was washed and the particles were counted.
- the present invention is not limited to the embodiments and examples described above and can be changed and improved as suitable.
- the technological concept of this invention can be applied to all parts of the bearing unit in addition to the races and rolling elements.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Rolling Contact Bearings (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/690,471 US6896416B2 (en) | 2000-12-20 | 2003-10-21 | Rolling-bearing and bearing unit |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000387233A JP2002188646A (ja) | 2000-12-20 | 2000-12-20 | 転がり軸受及び軸受装置 |
| JP2000-387233 | 2000-12-20 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10/690,471 Continuation US6896416B2 (en) | 2000-12-20 | 2003-10-21 | Rolling-bearing and bearing unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20020090157A1 true US20020090157A1 (en) | 2002-07-11 |
Family
ID=18854210
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10/029,419 Abandoned US20020090157A1 (en) | 2000-12-20 | 2001-10-20 | Rolling-bearing and bearing unit |
| US10/690,471 Expired - Fee Related US6896416B2 (en) | 2000-12-20 | 2003-10-21 | Rolling-bearing and bearing unit |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10/690,471 Expired - Fee Related US6896416B2 (en) | 2000-12-20 | 2003-10-21 | Rolling-bearing and bearing unit |
Country Status (3)
| Country | Link |
|---|---|
| US (2) | US20020090157A1 (de) |
| JP (1) | JP2002188646A (de) |
| DE (1) | DE10162965B4 (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100142875A1 (en) * | 2008-12-04 | 2010-06-10 | Jtekt Corporation | Rolling bearing device |
| US20110311175A1 (en) * | 2009-01-28 | 2011-12-22 | The Timken Company | Oscillating Ball Bearing |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006019982A1 (de) * | 2006-04-29 | 2007-10-31 | Schaeffler Kg | Wälzlager-Drehverbindung |
| JP2008128481A (ja) * | 2006-11-27 | 2008-06-05 | Nsk Ltd | 軸受ユニット |
| US20090039566A1 (en) * | 2007-08-07 | 2009-02-12 | Rodman William L | Composite structures and methods of making same |
| US8225509B2 (en) * | 2008-01-11 | 2012-07-24 | Kaydon Corporation | Method for making a pivot arm assembly for semiconductor wafer handling robots |
| JP4995151B2 (ja) * | 2008-06-20 | 2012-08-08 | Ｎｔｎ株式会社 | 航空・宇宙用転がり軸受の品質管理方法 |
| JP2012062915A (ja) * | 2010-09-14 | 2012-03-29 | Ntn Corp | 転がり軸受 |
| DE102014220872A1 (de) | 2014-10-15 | 2016-04-21 | Christof Diener | Ölanziehendes Lager mit oberflächenmodifiziertem Teil aus nichtrostendem Wälzlagerstahl |
| US10274011B2 (en) | 2017-08-03 | 2019-04-30 | Goodrich Corporation | Electrodynamically finished plain bearings |
| US10371208B2 (en) | 2017-08-03 | 2019-08-06 | Goodrich Corporation | Bearing assemblies with electrodynamically matched races |
| EP3900875B1 (de) * | 2019-01-31 | 2024-03-20 | NSK Ltd. | Verfahren zur herstellung eines lagerringelements, verfahren zur herstellung eines wälzlagers, verfahren zur herstellung eines nabeneinheitslagers und verfahren zur herstellung eines fahrzeugs |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3001838A (en) | 1958-04-16 | 1961-09-26 | Edward R Lamson | Lubricated anti-friction bearings |
| NL255620A (de) * | 1959-09-14 | |||
| US3515599A (en) | 1968-05-14 | 1970-06-02 | Eaton Yale & Towne | Process for treating ferrous surfaces |
| US4248485A (en) | 1979-10-01 | 1981-02-03 | Dresser Industries, Inc. | Earth boring bit with textured bearing surface |
| JPS56134143A (en) * | 1980-03-12 | 1981-10-20 | Hitachi Zosen Corp | Continuous working method for band plate |
| JPS6224956A (ja) * | 1985-07-19 | 1987-02-02 | Ntn Toyo Bearing Co Ltd | 玉軸受の軌道溝の超仕上げ方法 |
| JPH0343144A (ja) * | 1989-07-06 | 1991-02-25 | Olympus Optical Co Ltd | レンズ研削方法および研削装置 |
| JPH0384218A (ja) * | 1989-08-29 | 1991-04-09 | Nippon Seiko Kk | 密封形転がり軸受 |
| JP2745725B2 (ja) * | 1989-10-04 | 1998-04-28 | 旭硝子株式会社 | 電解研摩・研削方法及びその装置 |
| US5290070A (en) * | 1992-01-14 | 1994-03-01 | Storage Technology Corporation | Carriage guides for head disk actuator assemblies |
| JP2899735B2 (ja) * | 1992-12-01 | 1999-06-02 | 光洋精工株式会社 | 転がり軸受 |
| US5474263A (en) * | 1993-03-09 | 1995-12-12 | Honeywell Inc. | Reaction wheel and method of safing wheel |
| US5503481A (en) * | 1993-12-09 | 1996-04-02 | The Timken Company | Bearing surfaces with isotropic finish |
| US5723923A (en) | 1995-02-21 | 1998-03-03 | The United States Of America As Represented By The United States National Aeronautics And Space Administration | Apparatus for providing torque and for storing momentum energy |
| US5878496A (en) * | 1996-04-09 | 1999-03-09 | Purdue Research Foundation | Method of manufacturing a component |
| NZ332712A (en) * | 1996-05-22 | 2000-07-28 | Warner Lambert Co | Polypeptide inhibitors of protein farnesyl transferase |
| NL1003233C2 (nl) | 1996-05-30 | 1997-12-03 | Skf Ind Trading & Dev | Werkwijze voor het vervaardigen van een lagerring en een lager dat een dergelijke lagerring omvat. |
| JP3729217B2 (ja) | 1996-07-17 | 2005-12-21 | 株式会社安川電機 | 転がり軸受の玉への固体潤滑膜形成方法 |
| US5868608A (en) * | 1996-08-13 | 1999-02-09 | Lsi Logic Corporation | Subsonic to supersonic and ultrasonic conditioning of a polishing pad in a chemical mechanical polishing apparatus |
| JP4104199B2 (ja) * | 1998-02-26 | 2008-06-18 | 独立行政法人理化学研究所 | 成形鏡面研削装置 |
| US6318898B1 (en) * | 1999-10-15 | 2001-11-20 | Reliance Electric Technologies, Llc | Corrosion-resistant bearing and method for making same |
-
2000
- 2000-12-20 JP JP2000387233A patent/JP2002188646A/ja active Pending
-
2001
- 2001-10-20 US US10/029,419 patent/US20020090157A1/en not_active Abandoned
- 2001-12-20 DE DE2001162965 patent/DE10162965B4/de not_active Expired - Fee Related
-
2003
- 2003-10-21 US US10/690,471 patent/US6896416B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100142875A1 (en) * | 2008-12-04 | 2010-06-10 | Jtekt Corporation | Rolling bearing device |
| EP2194284A3 (de) * | 2008-12-04 | 2013-09-18 | Jtekt Corporation | Wälzlagervorrichtung |
| US8591115B2 (en) | 2008-12-04 | 2013-11-26 | Jtekt Corporation | Rolling bearing device |
| US20110311175A1 (en) * | 2009-01-28 | 2011-12-22 | The Timken Company | Oscillating Ball Bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002188646A (ja) | 2002-07-05 |
| DE10162965A1 (de) | 2003-03-27 |
| US20040131293A1 (en) | 2004-07-08 |
| US6896416B2 (en) | 2005-05-24 |
| DE10162965B4 (de) | 2006-12-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: NSK LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MATSUZAKI, HIROYUKI;REEL/FRAME:012765/0606 Effective date: 20020215 |
|
| STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |