DE102008050401A1 - Bearing arrangement, particularly bearing of rotor for turbocharger, has relatively stationary bearing surface and relatively movable bearing surface that is separated from relatively stationary bearing surface - Google Patents

Bearing arrangement, particularly bearing of rotor for turbocharger, has relatively stationary bearing surface and relatively movable bearing surface that is separated from relatively stationary bearing surface Download PDF

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Publication number
DE102008050401A1
DE102008050401A1 DE102008050401A DE102008050401A DE102008050401A1 DE 102008050401 A1 DE102008050401 A1 DE 102008050401A1 DE 102008050401 A DE102008050401 A DE 102008050401A DE 102008050401 A DE102008050401 A DE 102008050401A DE 102008050401 A1 DE102008050401 A1 DE 102008050401A1
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DE
Germany
Prior art keywords
bearing
bearing surface
relatively
relatively stationary
rotor
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.)
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DE102008050401A
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German (de)
Inventor
Klaus Czerwinski
Martin Dr. Schlegl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BMTS Technology GmbH and Co KG
Original Assignee
Bosch Mahle Turbo Systems GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bosch Mahle Turbo Systems GmbH and Co KG filed Critical Bosch Mahle Turbo Systems GmbH and Co KG
Priority to DE102008050401A priority Critical patent/DE102008050401A1/en
Publication of DE102008050401A1 publication Critical patent/DE102008050401A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
    • 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
    • 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
    • F16C33/122—Multilayer structures of sleeves, washers or liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/40—Application in turbochargers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/611—Coating
    • 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
    • F16C2360/00—Engines or pumps
    • F16C2360/23—Gas turbine engines
    • F16C2360/24—Turbochargers

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supercharger (AREA)

Abstract

The bearing arrangement has a relatively stationary bearing surface and a relatively movable bearing surface that is separated from the relatively stationary bearing surface by a lubricating oil layer. One of the bearing surfaces is formed in an oleophillic nature and other bearing surface is formed in an oleophobic nature. The bearing surface is provided with polysilazane coating.

Description

Die Erfindung bezieht sich auf eine Lageranordnung, insbesondere ein Lager eines Rotors eines Turboladers, mit zumindest einer relativ stationären ersten Lagerfläche sowie zumindest einer davon durch eine Schmiermittelschicht trennbaren, relativ beweglichen zweiten Lagerfläche.The The invention relates to a bearing arrangement, in particular a Bearing of a rotor of a turbocharger, with at least one relative stationary first storage area as well as at least one of which is separable by a lubricant layer, relatively movable second storage area.

Derartige Lageranordnungen sind für Rotoren von Turboladern, bspw. aus der EP 0 395 825 A1 , bekannt. Gemäß dieser Druckschrift ist die axial zwischen einem Turbinen- und einem Verdichterrad angeordnete Rotorwelle in einem zwischen einem Turbinengehäuse und einem Verdichtergehäuse angeordneten Lagergehäuse drehgelagert. Zu diesem Zweck ist im Lagergehäuse eine Lagerbohrung vorgesehen, die zwei voneinander axial beabstandete Lagerbuchsen aufnimmt, welche durch Formschluss in der Lagerbohrung undrehbar festgehalten werden. Axial zwischen den Lagerbuchsen ist eine Spacerbuchse mit gegenüber den Lagerbuchsen vergrößertem Innendruchmesser und geringerem Außendurchmesser angeordnet. Sowohl die Lagerbuchsen als auch die Spacerbuchse besitzen jeweils in ihrer axialen Mitte angeordnete Radialöffnungen, wobei die Radialöffnungen der Lagerbuchsen mit an der Lagerbohrung des Lagergehäuses angeordneten Mündungen von Schmiermittelzuführungen kommunizieren, während die Radialöffnungen der Spacerbuchse mit einer an der Lagerbohrung des Lagergehäuses angeordneten Schmiermittelabfuhrleitung in Verbindung stehen. Auf diese Weise kann zwischen die Innenumfangsflächen der Lagerbuchsen und die Außenumfangsflächen der in den Lagerbuchsen aufgenommenen Teile der Rotorwelle Schmiermittel bzw. -öl eingebracht werden, derart, dass eine Schmiermittelschicht mit hinreichender Tragkraft erzeugt, und eine unmittelbare Berührung zwischen den schmiermittelseitigen Flächen der Lagerbuchsen und der Rotorwelle verhindert wird.Such bearing arrangements are for rotors of turbochargers, for example. From the EP 0 395 825 A1 , known. According to this document, the rotor shaft arranged axially between a turbine and a compressor wheel is rotatably mounted in a bearing housing arranged between a turbine housing and a compressor housing. For this purpose, a bearing bore is provided in the bearing housing, which receives two axially spaced-apart bearing bushes, which are held non-rotatably by positive engagement in the bearing bore. Axially between the bearing bushes a Spacerbuchse with respect to the bearing bushes enlarged Innenendruchmesser and smaller outer diameter is arranged. Both the bushings and the Spacerbuchse have each arranged in its axial center radial openings, wherein the radial openings of the bushings communicate with arranged on the bearing bore of the bearing housing mouths of lubricant supply, while the radial openings of the Spacerbuchse with a arranged on the bearing bore of the bearing housing lubricant discharge line , In this way, lubricant or oil can be introduced between the inner peripheral surfaces of the bushings and the outer peripheral surfaces of the received in the bearing bushes parts of the rotor shaft, such that a lubricant layer generates sufficient bearing force, and a direct contact between the lubricant side surfaces of the bushings and the Rotor shaft is prevented.

Aus der WO 2006/089649 ist es bekannt, Metalloberflächen mit oleophoben Oberflächen bzw. Beschichtungen aus Polysilazanen zu versehen, um eine Beeinträchtigung der dekorativen Wirkung der Metalloberflächen durch Fingerabdrücke zu vermeiden.From the WO 2006/089649 It is known to provide metal surfaces with oleophobic surfaces or coatings of polysilazanes to prevent deterioration of the decorative effect of the metal surfaces by fingerprints.

Die Erfindung steht im Zusammenhang mit dem Problem unter allen Umständen zwischen den schmiermittelseitigen Lagerflächen der Rotorlager eines Turboladers einen schmierwirksamen Ölfilm zu gewährleisten bzw. die Lagerreibung so weit als möglich zu vermindern.The Invention is related to the problem under all circumstances between the lubricant side bearing surfaces of the rotor bearings a turbocharger to ensure a lubricating oil film or to reduce the bearing friction as far as possible.

Deshalb ist es Aufgabe der Erfindung, optimierte Rotorlager zu schaffen.Therefore It is an object of the invention to provide optimized rotor bearings.

Diese Aufgabe wird bei einer Lageranordnung der eingangs angegebenen Art erfindungsgemäß dadurch gelöst, dass die eine Lagerfläche oleophil und die andere Lagerfläche oleophob ausgebildet ist.These Task is in a bearing assembly of the type specified solved according to the invention that one bearing surface oleophilic and the other bearing surface is formed oleophobic.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist dabei vorgesehen, dass die stationäre Lagerfläche oleophob und die relativ bewegliche Lagerfläche oleophil ausgebildet ist.According to one preferred embodiment of the invention is provided here, that the stationary storage area oleophobic and the relatively movable bearing surface is formed oleophilic.

Insbesondere ist in diesem Zusammenhang zweckmäßig vorgesehen, die Innenumfangsfläche von stationären Lagerbuchsen oleophob und die Außenumfangsflächen der in den Lagerbuchsen aufgenommen Teile einer drehbaren Welle oleophil auszubilden.Especially is appropriate in this context, the inner peripheral surface of stationary bushings oleophobic and the outer peripheral surfaces of the Bushings taken to form parts of a rotatable shaft oleophilic.

Die oleophile Ausbildung der einen Lagerfläche bzw. der Umfangsfläche der Welle bewirkt eine intensive Benetzung der Welle mit dem Schmiermittel, so dass die Welle einerseits immer durch eine wirksame Schmiermittelschicht umhüllt wird und andererseits bei Bedarf eine verbesserte Kühlung der Welle durch ständig nachgeführtes Schmiermittel erreichbar ist. Dies ist insbesondere bei Abgasturboladern vorteilhaft, bei denen vom Turbinenrad ein erheblicher Wärmestrom auf die Rotorwelle übertragen wird.The oleophilic design of a bearing surface or the peripheral surface the shaft causes intensive wetting of the shaft with the lubricant, so that the shaft always on the one hand by an effective lubricant layer is wrapped and on the other hand, if necessary, an improved Cooling of the shaft by constantly tracked Lubricant is achievable. This is especially true for exhaust gas turbochargers advantageous in which the turbine wheel a considerable heat flow is transmitted to the rotor shaft.

Die oleophobe Ausgestaltung der anderen Lagerfläche vermindert die Scherbeanspruchung der Schmiermittelschicht und verbessert dementsprechend die Stabilität der Schmiermittelschicht, und zwar unter Verminderung der Lagerreibung.The oleophobic design of the other storage area reduced the shear stress of the lubricant layer and improves accordingly the stability of the lubricant layer, under Reduction of bearing friction.

Im Übrigen wird hinsichtlich bevorzugter Merkmale der Erfindung auf die Ansprüche und die nachfolgende Erläuterung der Zeichnung verwiesen, anhand der eine besonders bevorzugte Ausführungsform der Erfindung näher erläutert wird.Furthermore is in terms of preferred features of the invention to the claims and the following explanation of the drawing, based the one particularly preferred embodiment of the invention is explained in more detail.

Schutz wird nicht nur für angegebene oder dargestellte Merkmalskombinationen sondern auch für prinzipiell beliebige Kombinationen der angegebenen oder dargestellten Einzelmerkmale beansprucht.protection is not only for specified or illustrated feature combinations but also for basically any combination of claimed or illustrated individual features claimed.

In der Zeichnung zeigt die einzige Figur einen Axialschnitt einer erfindungemäßen Lageranordnung, wobei lediglich eine stationäre Lagerbuchse sowie der darin aufgenommene Abschnitt einer Rotorwelle eines Turboladers dargestellt sind.In The drawing shows the sole figure an axial section of a erfindungemäßen Bearing arrangement, wherein only a stationary bearing bush and the portion of a rotor shaft of a turbocharger received therein are shown.

Gemäß der Zeichnung ist eine nur ausschnittsweise dargestellte Rotorwelle 1 in einer Lagerbuchse 2, die ihrerseits in einem nicht dargestellten Lagergehäuse eines Turboladers oder dergleichen stationär angeordnet ist, hydrostatisch oder hydrodynamisch drehgelagert, dass heißt zwischen dem Innenumfang der Lagerbuchse 2 und dem Außenumfang der Rotorwelle 1 wird entweder erst bei Drehung der Rotorwelle 1 oder bereits im Stillstand der Rotorwelle 1 ein die Rotorwelle 1 tragender Ölfilm 3 erzeugt.According to the drawing is a fragmentary illustrated rotor shaft 1 in a bushing 2 , which in turn is arranged stationarily in a bearing housing, not shown, of a turbocharger or the like, rotatably mounted hydrostatically or hydrodynamically, that is, between the inner circumference of the bearing bush 2 and the outside circumference of the rotor shaft 1 is either only on rotation of the rotor shaft 1 or already at standstill of the rotor shaft 1 a the rotor shaft 1 carrying oil film 3 generated.

Gemäß der Erfindung besitzt der Außenumfang der Rotorwelle innerhalb der Lagerbuchse 2 eine oleophile Beschichtung 4, und der Innenumfang der Lagerbuchse 2 weist eine oleophobe Beschichtung 5 auf. Damit bildet der Ölfilm 3 eine den Außenumfang der Rotorwelle 1 gut benetzende Ölfilmschicht 6, während am Innenumfang der Lagerbuchse 2 eine die Innenumfangsfläche der Lagerbuchse 2 nur vergleichsweise schlecht benetzende Ölfilmschicht 7 gebildet wird. Gegebenenfalls können der Außenumfang der Rotorwelle 1 und der Innenumfang der Lagerbuchse 2 noch in einer die oleophobe bzw. die oleophile Beschichtung 4, 5 in ihrer jeweiligen Wirkung unterstützende Strukturierung aufweisen.According to the invention, the outer circumference of the rotor shaft has inside the bearing bush 2 an oleophilic coating 4 , and the inner circumference of the bearing bush 2 has an oleophobic coating 5 on. This forms the oil film 3 one the outer circumference of the rotor shaft 1 good wetting oil film layer 6 , while on the inner circumference of the bearing bush 2 one the inner peripheral surface of the bearing bush 2 only comparatively poorly wetting oil film layer 7 is formed. Optionally, the outer circumference of the rotor shaft 1 and the inner circumference of the bearing bush 2 still in one the oleophobic or the oleophilic coating 4 . 5 have supportive structuring in their respective effect.

Die Erfindung bietet einerseits den Vorteil, dass aufgrund der guten Benetzung der Rotorwelle 1 eine unmittelbare Berührung zwischen Rotorwelle 1 und Lagerbuchse 2 vermieden wird. Andererseits bewirkt die oleophobe Ausgestaltung der Lagerbuchse 2, dass die Lagerreibung vermindert wird, weil im Ölfilm 3 nur verringerte Scherbeanspruchungen auftreten. Schließlich wird durch die gute Benetzbarkeit der Rotorwelle bei entsprechender Ölzufuhr in den Lagerspalt zwischen Rotorwelle 1 und Lagerbuchse 2 eine vergleichsweise gute Kühlung der Rotorwelle 1 erreicht.On the one hand, the invention offers the advantage that due to the good wetting of the rotor shaft 1 a direct contact between the rotor shaft 1 and bearing bush 2 is avoided. On the other hand, the oleophobic design of the bushing causes 2 in that the bearing friction is reduced because in the oil film 3 only reduced shear stresses occur. Finally, the good wettability of the rotor shaft with appropriate oil supply in the bearing gap between the rotor shaft 1 and bearing bush 2 a comparatively good cooling of the rotor shaft 1 reached.

ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • - EP 0395825 A1 [0002] EP 0395825 A1 [0002]
  • - WO 2006/089649 [0003] WO 2006/089649 [0003]

Claims (4)

Lageranordnung, insbesondere Lager eines Rotors eines Turboladers, mit zumindest einer relativ stationären Lagerfläche sowie zumindest einer davon durch eine Schmierölschicht trennbaren relativ beweglichen Lagerfläche, dadurch gekennzeichnet, dass die eine Lagerfläche oleophil und andere Lagerfläche oleophob ausgebildet ist.Bearing arrangement, in particular bearing a rotor of a turbocharger, with at least one relatively stationary bearing surface and at least one of them separable by a lubricating oil layer relatively movable bearing surface, characterized in that the one bearing surface oleophilic and other bearing surface is formed oleophobic. Lageranordnung nach Anspruch 1, dadurch gekennzeichnet, dass die relativ stationäre Lagerfläche oleophob und relativ bewegliche Lagerfläche oleophil ausgebildet ist.Bearing arrangement according to Claim 1, characterized that the relatively stationary storage area is oleophobic and relatively movable bearing surface formed oleophilic is. Lageranordnung nach Anspruch 2, dadurch gekennzeichnet, dass die relativ stationäre Lagerfläche die Innenumfangsfläche einer Lagerbuchse (2) und die relativ bewegliche Lagerfläche die Außenumfangsfläche einer Welle (1), insbesondere Rotorwelle, bildet.Bearing arrangement according to claim 2, characterized in that the relatively stationary bearing surface, the inner peripheral surface of a bearing bush ( 2 ) and the relatively movable bearing surface, the outer peripheral surface of a shaft ( 1 ), in particular rotor shaft forms. Lageranordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Lagerflächen jeweils eine für Oleophobie oder für Oleophilie nachbehandelte Beschichtung mit Polysilazanen aufweisen.Bearing arrangement according to one of the claims 1 to 3, characterized in that the bearing surfaces one each for oleophobia or for oleophilic aftertreated Having coating with polysilazanes.
DE102008050401A 2008-10-04 2008-10-04 Bearing arrangement, particularly bearing of rotor for turbocharger, has relatively stationary bearing surface and relatively movable bearing surface that is separated from relatively stationary bearing surface Withdrawn DE102008050401A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102008050401A DE102008050401A1 (en) 2008-10-04 2008-10-04 Bearing arrangement, particularly bearing of rotor for turbocharger, has relatively stationary bearing surface and relatively movable bearing surface that is separated from relatively stationary bearing surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008050401A DE102008050401A1 (en) 2008-10-04 2008-10-04 Bearing arrangement, particularly bearing of rotor for turbocharger, has relatively stationary bearing surface and relatively movable bearing surface that is separated from relatively stationary bearing surface

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DE102008050401A1 true DE102008050401A1 (en) 2010-04-08

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103161828A (en) * 2011-12-12 2013-06-19 Skf公司 Bearing cage and bearing cage segment
WO2016058857A1 (en) * 2014-10-15 2016-04-21 Grw Gebr. Reinfurt Gmbh & Co. Kg Oleophilic bearing with surface-modified part made of stainless rolling bearing steel
EP3715589A1 (en) * 2019-03-25 2020-09-30 Rolls-Royce plc Gas turbine bearing chamber

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0395825A1 (en) 1989-05-02 1990-11-07 AlliedSignal Inc. Turbocharger bearing assembly
WO2003083318A1 (en) * 2002-03-28 2003-10-09 Imperial College Innovations Limited Bearing
DE10318234A1 (en) * 2003-04-22 2004-11-25 Clariant Gmbh Use of polysilazane for the production of hydrophobically and oleophobically modified surfaces
WO2006089649A1 (en) 2005-02-26 2006-08-31 Clariant International Ltd Use of polysilazanes as permanent anti-fingerprint coatings

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0395825A1 (en) 1989-05-02 1990-11-07 AlliedSignal Inc. Turbocharger bearing assembly
WO2003083318A1 (en) * 2002-03-28 2003-10-09 Imperial College Innovations Limited Bearing
DE10318234A1 (en) * 2003-04-22 2004-11-25 Clariant Gmbh Use of polysilazane for the production of hydrophobically and oleophobically modified surfaces
WO2006089649A1 (en) 2005-02-26 2006-08-31 Clariant International Ltd Use of polysilazanes as permanent anti-fingerprint coatings

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103161828A (en) * 2011-12-12 2013-06-19 Skf公司 Bearing cage and bearing cage segment
WO2016058857A1 (en) * 2014-10-15 2016-04-21 Grw Gebr. Reinfurt Gmbh & Co. Kg Oleophilic bearing with surface-modified part made of stainless rolling bearing steel
DE102014220872A1 (en) 2014-10-15 2016-04-21 Christof Diener Oil attracting bearing with surface modified stainless steel bearing steel part
US10024362B2 (en) 2014-10-15 2018-07-17 Grw Gebr. Reinfurt Gmbh & Co. Kg Oleophilic bearing with surface-modified part made of stainless rolling bearing steel
EP3715589A1 (en) * 2019-03-25 2020-09-30 Rolls-Royce plc Gas turbine bearing chamber

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