WO2002070909A1 - Roulement a rouleaux cylindriques en acier de nitruration - Google Patents
Roulement a rouleaux cylindriques en acier de nitruration Download PDFInfo
- Publication number
- WO2002070909A1 WO2002070909A1 PCT/FR2002/000712 FR0200712W WO02070909A1 WO 2002070909 A1 WO2002070909 A1 WO 2002070909A1 FR 0200712 W FR0200712 W FR 0200712W WO 02070909 A1 WO02070909 A1 WO 02070909A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel
- rollers
- bearing according
- nitriding
- rings
- Prior art date
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
- F16C33/30—Parts of ball or roller bearings
- F16C33/46—Cages for rollers or needles
- F16C33/56—Selection of substances
- F16C33/565—Coatings
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
-
- 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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/24—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly
- F16C19/26—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with a single row of rollers
-
- 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
- F16C33/34—Rollers; Needles
Definitions
- rollers with symmetry of revolution about an axis, and each of which comprises a central cylindrical part of circular section, extended in an axial direction and symmetrically on each side, by a portion of slightly frustoconical end, coaxial with the central cylindrical part, and converging axially towards the outside from a very small angle, each frustoconical portion connecting, by a rounded annular part, with constant radius of curvature, to one respectively of the two lateral faces, or of axial end, of the roller, which are perpendicular to the axis of the roller.
- the invention relates more precisely to a stripped cylindrical roller bearing, as presented above, of high precision, for example of ISO4-RBEC7 level, and in particular of aeronautical quality.
- stripped cylindrical roller bearings of the type presented above the rollers of which are made of a steel chosen from traditional bearing steels, preferably of the M50 or 100C6 type, and the inner and outer rings of which are made of a steel chosen from the abovementioned traditional bearing steels, preferably of the M50 type or 100C6, or among the structural nitriding or carburizing steels, preferably and respectively of type 32CDV13 or M50NIL
- the nitriding depth of the deep nitriding steel is in a range extending from about 0.45 mm to about 0.75 mm.
- the deep nitriding nitriding steel is a 32CDV13 steel, and in the embodiment which has given the best results, this 32CDV13 steel is of the grade G.K.H.Y.W. of the French steelmaker Aubert and Duval.
- roller bearing according to the invention exhibits better fatigue behavior of the contact surfaces between rollers and rings, and therefore better resistance to indentation of the contact surfaces during the absorption of foreign particles. , compared with the bearings of the same type in the state of the art, so that the life of the roller bearings according to the invention is greatly extended compared to that of known analogous bearings, before the appearance of the first cracks surface fatigue causing flaking of the rollers and raceways of the rings.
- the outer and inner rings at least one of these can be made of a traditional bearing steel, of type 100C6, or of type M50 (or 80DCV40) comprising, in percent and by weight, of the order of: - 0.8% of C,
- At least one of the outer and inner rings can be made of a structural carburizing steel of the M50NIL type, comprising, in percent and by weight, of the order of: - 0.12% of C,
- the best performance is obtained when at least one of the outer and inner rings of the bearing, and preferably each of the rings, is made of a nitriding steel similar or preferably identical to that of the rollers, and with deep nitriding with complete elimination of the white surface layer of nitrides at least on any surface of said ring which is intended to come into contact with the rollers and / or the cage.
- the nitriding is carried out so that the rollers and, if appropriate, the ring or rings made of deep nitriding steel have a surface hardness comprised in a range extending from approximately 720 to approximately 850 Vickers on a load of 0 , 5 kg, and a hardness at core (under the nitrided layer) included in a range extending from approximately 330 approximately 420 Vickers on load of 0.5 kg.
- the metal cage is made of bronze or of a 40NCD7 type steel produced under vacuum, with surface silvering at least at the level of the cells.
- the cylindrical external raceway is delimited on the outer ring between two annular lateral shoulders projecting " substantially radially inwardly, so that the rollers are retained between the two lateral shoulders of the outer ring.
- the ratio of the radial height of each shoulder to the diameter of the rollers is comprised in a range extending from approximately 0.29 to approximately 0.31, and, d 'on the other hand, that each shoulder has an internal face, facing the rollers, which has a small draft angle, included in a range extending from about 15' to about 45 '.
- each shoulder of the outer ring may have a cylindrical surface, in internal radial position, coaxial with the external raceway, and forming a centering surface of the cage.
- the internal raceway it is advantageously delimited on the inner ring between two axial end portions of said inner ring, each having a frustoconical external face converging axially towards the outside.
- FIG. 1 is a side elevation view of the stripped cylindrical roller bearing
- FIG. 2 is a sectional view of the bearing of Figure 1 along the diametral section plane II-II of Figure 1
- - Figure 3 is a cross-sectional view, on a larger scale, of the outer ring of the roller bearing in Figures 1 and 2
- FIG. 4 is a cross-sectional view, similar to FIG. 3, of the inner ring of the roller bearing of FIGS. 1 and 2,
- FIG. 7 shows profiles, close to the surface, of residual stresses on finished machining parts, such as rollers and bearing rings, before the thermochemical treatment of deep nitriding of parts in 32CDV13, or of case hardening '' one or more rings in M50NIL, or even before the heat treatment of hardening of one or more rings in M50.
- FIG. 8 represents profiles of residual stresses due to the corresponding thermochemical or thermal treatment on these same parts
- FIGS. 1 to 6 show an optimal hardness profile, as a function of depth, in a part (roller or ring) of 32CDV13 nitrided steel, at a surface with deep nitriding.
- the roller bearing of FIGS. 1 to 6 essentially comprises an outer ring 1, an inner ring 2, rollers 3 arranged between the rings 1 and 2 which are coaxial around the axis XX of the bearing, and an annular cage 4, also disposed between the rings 1 and 2, and which has as many cells, regularly distributed over its periphery, as the bearing comprises rollers 3, each cell of the cage 4 housing one of the rollers 3 respectively.
- the cage 4 and each of the rings 1 and 2 as well as each of the rollers 3 is a monobloc element (in one piece) of metal, and the rings 1 and 2 of steel are each with symmetry of revolution about the axis XX of the bearing as well as symmetrical with respect to the median radial plane of the bearing, just as each roller 3 also made of steel has a symmetry of revolution about its own axis YY and symmetrical about a plane perpendicular to this axis YY and passing through its middle .
- each roller bearing is of the stripped 3 cylindrical roller type, that is to say that each roller 3 has the shape shown in FIGS. 5 and 6: each roller 3 has a cylindrical central part 5 of circular section, which is extended axially on each side by one respectively of two end parts 6, symmetrical to one another, and with an external lateral surface very slightly frustoconical and converging axially towards the outside, each frustoconical part 6 connecting, by an annular part 7, convex and rounded with constant radius of curvature, to one respectively of the two lateral faces 8 (or axial end faces) of the bearing 3, each lateral face 8 extending perpendicular to the axis of revolution YY of the roller 3, the two frustoconical parts 6 and the two convex parts 7 being coaxial with the central cylindrical part 5.
- each of the thirty four rolls aux 3 is such that the diameter of its cylindrical central part 5 is equal to the axial length of the roller 3, between the two lateral faces 8, so that the shape of each roller 3, seen in plan, is that of a square with rounded tops.
- the annular cage 4 therefore has thirty four cells, each of which has a section corresponding substantially to the shape in plan or in section through a diametrical plane of a roller 3, that is to say square with rounded tops.
- the outer ring 1 has a U-shaped cross section (see Figures 2 and 3) with a concavity turned radially inward (relative to the axis XX of the bearing): this ring 1 comprises a central annular and cylindrical part 9 of circular section, the surface of which in internal radial position constitutes a cylindrical external track or raceway 10, delimited between two annular lateral shoulders 11 projecting radially inwards on the sides of the central part 9.
- each shoulder 11 that is to say the distance, in the radial direction between the external raceway 10 and the centering surfaces 13, which corresponds substantially to the height of the internal face 12 to low clearance angle, is such that the ratio of this radial height of each shoulder 11 to the diameter of the rollers 3 is within a range extending from approximately 0.25 to approximately 0.35, and preferably approximately 0 , 29 to about 0.31.
- outer lateral radial faces 14 of the shoulders 11 are each connected to the cylindrical face 15, in the outer radial position, of the central part 9 of the outer ring 1 by a slightly convex chamfer 16.
- the metal cage 4 machined from a blank forged for example in bronze, or in a 40NCD7 type steel produced under vacuum (in this case a Rockwell hardness of 23 to 35 HRc) and with surface silvering at least at the level of the cells housing the rollers 3, is centered on the cylindrical faces 13 of the shoulders 11 of the outer ring 1, so that the cage 4 is coaxial with the outer ring 1 and with the outer race 10 around the axis XX of the bearing.
- the cage 4 is further such that its lateral radial faces do not project outside, in the axial direction, from the external lateral radial faces 14 of the outer ring 1, and its cylindrical face, in the external radial position (coming in contact with the faces 13 of the shoulders 11) is also covered with a silver coating by a surface treatment in accordance with the American specification AMS2410.
- the inner ring 2 (see FIGS. 2 and 4) has a cylindrical annular central portion 17 of circular section, the smooth face of which in the external radial position constitutes an internal cylindrical track or raceway 18, which is opposite the raceway external cylindrical 10 and faces 13 for guiding the cage 4 on the external ring 1.
- the internal raceway 18 is delimited between two parts of axial ends 19 of this ring 2, which each have a frustoconical external surface 20, converge axially towards the outside, and a small frustoconical chamfer ⁇ internal ⁇ 21, -at the corresponding axial end of the cylindrical internal bore 22 of the inner ring 2.
- the outer ring 1 and its shoulders 11, the inner ring 2, the outer 10 and inner 18 raceways and the cage 4 are coaxial around the axis X-X of the bearing.
- the rollers 3 and the outer 1 and inner rings 2 are made of high-purity nitriding steel, with deep nitriding on all the working faces of the rollers 3 and of the rings 1 and 2 which come into contact with each other and with the cage 4.
- these are the external faces of the cylindrical central part 5, its frustoconical parts 6, and its lateral faces 8, and also in practice also of its parts rounded 7, so that each roller 3 is made of deep nitriding steel over its entire external surface.
- thermochemical treatment of deep nitriding which is a known treatment of gaseous nitriding applied long enough to the parts to that the nitriding - reaches - a depth - included - in a range extending from approximately 0.45 mm to approximately 0.75 mm from the surface of the treated part.
- thermochemical treatment of gaseous nitriding on a finished machining part essentially consists of enclosing the part in a confined enclosure, such as an oven, in which the part is subjected to a temperature gradient and maintained under a nitrogen atmosphere. at controlled pressure, during a controlled exposure time to obtain a diffusion of nitrogen from the surface of the steel part towards the interior of this part, to a desired depth.
- a nitriding treatment of a steel has the consequence of forming a surface layer of nitrides composed essentially of nitrides Fe4N and Fe2N, which is white in color, and covers the nitrided layer itself covering the core of the part. .
- This white layer the surface of abrasive nitrides is fragile and tends to exfoliate on rolling and this surface white layer of nitrides is completely removed by machining at least all of those of the deep nitriding faces of the rollers 3 and of the rings 1 and 2 which are working faces, that is to say intended to come into contact with each other and / or with the cage 4. This operation is carried out so that there is no longer any trace of the white nitriding layer on these working faces.
- rollers 3 and the rings 1 and 2 made of nitriding steel 32CDV13 have, at their working faces with deep nitriding, and in particular at the level of the tracks and raceways, a surface hardness comprised in a range extending from '' about 720 to
- the optimal hardness profile obtained on such deep nitriding steel parts is represented by curve 23 of FIG. 9, indicating on the ordinate the Vickers hardness under load of 0.5 kg as a function of the depth, expressed in mm from of the surface, on the abscissa, and this curve 23 of the hardness profile shows a steep decrease in hardness, of a value of approximately 825 Vickers under load of 0.5 kg (HV 0.5) for a depth from 0.1 mm to a value of approximately 400 HV0.5 for a depth of approximately 1 mm, then a substantially constant hardness around 400 HV0.5 for a depth of 1 to 1.5 mm.
- the rollers 3 are produced as described above, in steel 32CDV13 of grade GKHYW with deep nitriding (from about 0.45 to about 0.75 mm deep) without any trace of a white surface layer of nitrides on the working faces, but the rings 1 and 2 are made of another steel, such as a structural carburizing steel of type M50NIL, the chemical composition and certain characteristics of which are indicated in the first column of the above table.
- the M50NIL steel conforming to the American standard AMS 6278, is also produced by double vacuum fusion, to present a high purity, and, after the machining of the rings 1 and 2 from blanks forged in this steel, the rings 1 and 2 undergo a thermochemical carburizing treatment, at least at their working faces (external raceway 10 and internal faces 12 and cylindrical faces 13 of the shoulders 11 on the outer ring 1, and internal raceway 18 on the inner ring 2) designated by the terms "raceway" in the table, and at the level of which the characteristics indicated in the middle part of this first column of the table are obtained, while the characteristics at the core (under the cemented layer) are indicated in the lower part of this first column of the table.
- the rollers 3 are still produced as described above, while the rings 1 and 2 are produced in yet another
- thermochemical treatment of deep nitriding which takes place on the rollers 3 after a rectification-roughing operation of the rollers, is followed by a finishing rectification operation and superfinishing of the rollers 3. It is the same for the rings 1 and 2, after their thermochemical treatment of deep nitriding or carburizing, or even after their heat treatment of quenching, depending on whether these rings 1 and 2 are made of 32CDV13 GKHYW, or M50NIL, or 80DCV40 (M50), as explained above.
- FIG. 7 the profiles of the residual stresses on parts (rolls and rings) finished for machining are shown before thermochemical treatment of deep nitriding or case hardening or before heat treatment of hardening, depending on the steel used to produce the rings 1 and 2, these profile curves being shown very close to the surface.
- Profile curve 24 for steel 32CDV13, shows that from a compressive stress on the surface of the order of -400_MPa, the residual compressive stresses decrease very quickly to a depth of between approximately 5 ⁇ m and 10 ⁇ m, to then be substantially constant around -200 MPa at a depth varying from approximately 10 ⁇ m to approximately 20 ⁇ m, and then increase with a much smaller slope to reach approximately -300 MPa at a depth of order of 50 ⁇ m.
- Curve 26 corresponding to the profile of the residual stresses of the 80DCV40 or M50 steel also shows a very rapid reduction in the residual compressive stresses from a value of approximately -450 MPa at the surface to a zero value for a depth of l '' order of 12 to 13 ⁇ m, the residual stresses then being tensile stresses of the order of 25 to 30 MPa with a depth varying from approximately 20 ⁇ m to approximately 50 ⁇ m.
- the curves 24 ′, 25 ′ and 26 ′ represent the profiles of residual stresses corresponding respectively to the profiles 24, 25 and 26 of FIG. 7 for steels 32CDV13, M50NIL and 80DCV40 (or M50) respectively, but after their thermochemical treatment either of deep nitriding for steel 32CDV13, or of carburizing for steel M50NIL, or of heat treatment of hardening for 80DCV40 (or M50) steel.
- the curve 25 ′ of the profile of the residual compressive stresses of the cemented M50NIL steel is substantially constant around -200 MPa from a very shallow depth to a depth of around 800 ⁇ m, beyond which these stresses compression residuals decrease slowly.
- thermochemical treatment of deep nitriding essentially has the effect of shifting in depth the zone of the profile of residual stresses with strong decrease, on the one hand, and, on the other hand, that the residual stress profiles established during finishing and superfinishing rectification operations, which follow the thermochemical treatment of deep nitriding, are superimposed on the profiles obtained by the thermochemical effect of deep nitriding.
- these operations of rectification of finishing and superfinishing correspond, in FIG. 8, to a displacement of the surface, that is to say of the origin of the axis of the abscissae, of approximately 400 ⁇ m in depth, therefore along this axis.
- the stripped cylindrical roller bearings made of deep nitriding steel according to the invention exhibit better behavior on indentation of the surfaces in contact, during the ingestion of foreign particles, as well as better behavior under boundary conditions of lubrication, by comparison with known bearings of the same type.
- the bearings according to the invention are, for these reasons, particularly well suited to the application to the rotational mounting of the stages of rotors of turbine compressors and aircraft turbojets.
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- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2003-7011724A KR20040030530A (ko) | 2001-03-06 | 2002-02-27 | 질화강 재질의 원통형 전동 요소를 구비한 롤러 베어링 |
JP2002569595A JP2005504879A (ja) | 2001-03-06 | 2002-02-27 | 窒化鋼円筒ころ部品を用いた転がり軸受 |
EP02708424A EP1366306A1 (fr) | 2001-03-06 | 2002-02-27 | Roulement a rouleaux cylindriques en acier de nitruration |
CA002440123A CA2440123A1 (fr) | 2001-03-06 | 2002-02-27 | Roulement a rouleaux cylindriques en acier de nitruration |
US10/655,172 US20040071379A1 (en) | 2001-03-06 | 2003-09-04 | Rolling bearing with nitriding steel cylindrical rollers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR01/03029 | 2001-03-06 | ||
FR0103029A FR2821905B1 (fr) | 2001-03-06 | 2001-03-06 | Roulement a rouleaux cylindriques en acier de nitruration |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/655,172 Continuation US20040071379A1 (en) | 2001-03-06 | 2003-09-04 | Rolling bearing with nitriding steel cylindrical rollers |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002070909A1 true WO2002070909A1 (fr) | 2002-09-12 |
Family
ID=8860788
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/000712 WO2002070909A1 (fr) | 2001-03-06 | 2002-02-27 | Roulement a rouleaux cylindriques en acier de nitruration |
Country Status (8)
Country | Link |
---|---|
US (1) | US20040071379A1 (fr) |
EP (1) | EP1366306A1 (fr) |
JP (1) | JP2005504879A (fr) |
KR (1) | KR20040030530A (fr) |
CA (1) | CA2440123A1 (fr) |
FR (1) | FR2821905B1 (fr) |
PL (1) | PL373963A1 (fr) |
WO (1) | WO2002070909A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1875092B1 (fr) * | 2005-04-22 | 2019-10-16 | H.E.F. | Couple d'organes de guidage dont l'un est en un acier particulier conduisant à des performances anti-grippage améliorées |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10211198A1 (de) * | 2002-03-14 | 2003-09-25 | Fag Kugelfischer Ag & Co Kg | Oberflächenwellensensor |
DE102004041964B4 (de) * | 2004-08-04 | 2012-04-26 | Schaeffler Technologies Gmbh & Co. Kg | Maschinenelement für Wälzbelastung |
US8070364B2 (en) * | 2004-08-04 | 2011-12-06 | Schaeffler Kg | Rolling bearing of ceramic and steel engaging parts |
CN101652106A (zh) * | 2007-04-09 | 2010-02-17 | 新特斯有限责任公司 | 骨固定元件 |
US8337089B2 (en) | 2007-11-27 | 2012-12-25 | Ntn Corporation | Mechanical component and rolling bearing |
JP5397930B2 (ja) * | 2008-03-18 | 2014-01-22 | Ntn株式会社 | 転がり軸受 |
JP5397927B2 (ja) * | 2007-11-27 | 2014-01-22 | Ntn株式会社 | 機械部品 |
US8485730B2 (en) | 2008-03-27 | 2013-07-16 | Ntn Corporation | Rolling bearing |
JP5146960B2 (ja) * | 2008-03-27 | 2013-02-20 | Ntn株式会社 | 転がり軸受 |
JP5489111B2 (ja) * | 2009-03-25 | 2014-05-14 | Ntn株式会社 | 軸受部品、転がり軸受および軸受部品の製造方法 |
DE102012205242A1 (de) * | 2012-03-30 | 2013-10-02 | Schaeffler Technologies AG & Co. KG | Wälzlagerbauteil |
DE102019218794A1 (de) * | 2019-12-03 | 2021-06-10 | Thyssenkrupp Ag | Verfahren zur Erhöhung der Tragfähigkeit und Walzvorrichtung zum Hartwalzen einer randschichtgehärteten Wälzlagerlaufbahn |
CN115030958B (zh) * | 2022-06-06 | 2024-02-13 | 浙江江南石化机械有限公司 | 一种高密度熔融泵银轴瓦及其加工方法、设备 |
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DE4302635A1 (fr) * | 1992-02-25 | 1993-08-26 | Finkl & Sons Co | |
US5873956A (en) * | 1996-02-21 | 1999-02-23 | Nsk Ltd. | Rolling bearing |
US5998042A (en) * | 1995-10-19 | 1999-12-07 | Nsk Ltd. | Rolling bearing and rolling device |
GB2348468A (en) * | 1999-04-01 | 2000-10-04 | Nsk Ltd | Rolling bearing |
Family Cites Families (1)
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JPH0826446B2 (ja) * | 1990-05-17 | 1996-03-13 | 日本精工株式会社 | 転がり軸受 |
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2001
- 2001-03-06 FR FR0103029A patent/FR2821905B1/fr not_active Expired - Fee Related
-
2002
- 2002-02-27 KR KR10-2003-7011724A patent/KR20040030530A/ko not_active Application Discontinuation
- 2002-02-27 EP EP02708424A patent/EP1366306A1/fr not_active Withdrawn
- 2002-02-27 CA CA002440123A patent/CA2440123A1/fr not_active Abandoned
- 2002-02-27 WO PCT/FR2002/000712 patent/WO2002070909A1/fr not_active Application Discontinuation
- 2002-02-27 PL PL02373963A patent/PL373963A1/xx unknown
- 2002-02-27 JP JP2002569595A patent/JP2005504879A/ja active Pending
-
2003
- 2003-09-04 US US10/655,172 patent/US20040071379A1/en not_active Abandoned
Patent Citations (5)
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US3341321A (en) * | 1963-10-09 | 1967-09-12 | Skf Ind Inc | Process for treating primarily metallic materials |
DE4302635A1 (fr) * | 1992-02-25 | 1993-08-26 | Finkl & Sons Co | |
US5998042A (en) * | 1995-10-19 | 1999-12-07 | Nsk Ltd. | Rolling bearing and rolling device |
US5873956A (en) * | 1996-02-21 | 1999-02-23 | Nsk Ltd. | Rolling bearing |
GB2348468A (en) * | 1999-04-01 | 2000-10-04 | Nsk Ltd | Rolling bearing |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1875092B1 (fr) * | 2005-04-22 | 2019-10-16 | H.E.F. | Couple d'organes de guidage dont l'un est en un acier particulier conduisant à des performances anti-grippage améliorées |
Also Published As
Publication number | Publication date |
---|---|
FR2821905A1 (fr) | 2002-09-13 |
PL373963A1 (en) | 2005-09-19 |
JP2005504879A (ja) | 2005-02-17 |
CA2440123A1 (fr) | 2002-09-12 |
US20040071379A1 (en) | 2004-04-15 |
KR20040030530A (ko) | 2004-04-09 |
EP1366306A1 (fr) | 2003-12-03 |
FR2821905B1 (fr) | 2003-05-23 |
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