DE102014203841A1 - Rotor for an exhaust gas turbocharger - Google Patents
Rotor for an exhaust gas turbocharger Download PDFInfo
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- DE102014203841A1 DE102014203841A1 DE102014203841.3A DE102014203841A DE102014203841A1 DE 102014203841 A1 DE102014203841 A1 DE 102014203841A1 DE 102014203841 A DE102014203841 A DE 102014203841A DE 102014203841 A1 DE102014203841 A1 DE 102014203841A1
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- exhaust gas
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- 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
- F01D25/166—Sliding contact bearing
- F01D25/168—Sliding contact bearing for axial load mainly
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- 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
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- 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
- C23C8/28—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 more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
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- 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
- C23C8/80—After-treatment
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- 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
- F16C33/121—Use of special materials
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- 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
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- 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
- F05D2230/00—Manufacture
- F05D2230/40—Heat treatment
- F05D2230/41—Hardening; Annealing
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- 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
- F05D2300/50—Intrinsic material properties or characteristics
- F05D2300/506—Hardness
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- 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
- F05D2300/70—Treatment or modification of materials
- F05D2300/702—Reinforcement
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- 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
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
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- 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
- F16C2202/30—Electric properties; Magnetic properties
- F16C2202/40—Magnetic
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- 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
- F16C2204/00—Metallic materials; Alloys
- F16C2204/60—Ferrous alloys, e.g. steel alloys
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- 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
- F16C2204/00—Metallic materials; Alloys
- F16C2204/60—Ferrous alloys, e.g. steel alloys
- F16C2204/64—Medium carbon steel, i.e. carbon content from 0.4 to 0,8 wt%
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- 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
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/10—Hardening, e.g. carburizing, carbo-nitriding
- F16C2223/14—Hardening, e.g. carburizing, carbo-nitriding with nitriding
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- 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
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/10—Hardening, e.g. carburizing, carbo-nitriding
- F16C2223/16—Hardening, e.g. carburizing, carbo-nitriding with carbo-nitriding
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- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Supercharger (AREA)
Abstract
Die Erfindung betrifft einen Rotor (1) für einen Abgasturbolader (2) mit einer Welle (3), einem Verdichterrad (4) und einem Turbinenrad (5), und mit einer Dichtungsbuchse (7) und einer Anlaufscheibe (8) zur Axiallagerung. Erfindungswesentlich ist dabei, dass die Dichtungsbuchse (7) und/oder die Anlaufscheibe (8) aus Stahl ausgebildet und nachträglich gasnitriert, insbesondere nitrocarburiert, und damit oberflächengehärtet sind/ist. Hierdurch kann die Herstellung deutlich vereinfacht werden.The invention relates to a rotor (1) for an exhaust gas turbocharger (2) with a shaft (3), a compressor wheel (4) and a turbine wheel (5), and with a sealing bush (7) and a thrust washer (8) for axial bearing. Essential to the invention is that the sealing bush (7) and / or the thrust washer (8) formed of steel and subsequently gas-nitrided, in particular nitrocarburized, and thus surface hardened / is. As a result, the production can be significantly simplified.
Description
Die vorliegende Erfindung betrifft einen Rotor für einen Abgasturbolader mit einer Welle, einem Verdichterrad und einem Turbinenrad, gemäß dem Oberbegriff des Anspruchs 1. Die Erfindung betrifft außerdem einen Abgasturbolader mit einem derartigen Rotor sowie ein Verfahren zur Herstellung eines solchen. The present invention relates to a rotor for an exhaust gas turbocharger with a shaft, a compressor wheel and a turbine wheel, according to the preamble of claim 1. The invention also relates to an exhaust gas turbocharger with such a rotor and a method for producing such.
Abgasturbolader werden zur Leistungssteigerung bereits mannigfaltig in modernen Kraftfahrzeugen eingesetzt, wobei ein Rotor für einen derartigen Abgasturbolader üblicherweise aus einer ein Verdichterrad und ein Turbinenrad tragenden Welle aufgebaut ist. Gelagert wird der Rotor dabei üblicherweise über eine Radiallagerund Axiallagereinheit, wobei die Axiallagereinheit üblicherweise aus einer Dichtungsbuchse und einer Anlaufscheibe besteht. Diese beiden Komponenten reiben dabei im Betrieb aneinander und müssen somit erhöhten Verschleißanforderungen gerecht werden, weshalb die Dichtungsbuchse und auch die Anlaufscheibe oftmals aus Stählen hoher Härte, wie beispielsweise einen Stahl mit der Härte 58HRC, ausgebildet sind. Der gängige Prozess hierbei ist ein Durchhärteverfahren, was jedoch den grundlegenden Nachteil aufweist, dass sich bei dem Durchhärten das Bauteil, das heißt genauer gesagt die Dichtungsbuchse bzw. die Anlaufscheibe, geometrisch verziehen kann, wodurch diese nach dem eigentlichen Härten nochmals nachbearbeitet werden muss. Da das erforderliche Nachbearbeiten nunmehr bereits am gehärten Stahl erfolgt, ist dieser Prozess vergleichsweise teuer. Exhaust gas turbochargers are already widely used to increase performance in modern motor vehicles, a rotor for such an exhaust gas turbocharger is usually constructed of a compressor wheel and a turbine wheel supporting shaft. The rotor is usually mounted via a radial bearing and thrust bearing unit, wherein the thrust bearing unit usually consists of a sealing bushing and a thrust washer. These two components rub against each other during operation and must thus meet increased wear requirements, which is why the sealing bush and also the thrust washer are often made of steels of high hardness, such as a steel with a hardness of 58HRC. The common process in this case is a through hardening process, which however has the fundamental disadvantage that, during the hardening, the component, that is more precisely the sealing bush or the thrust washer, can warp geometrically, whereby it has to be reworked after the actual hardening. Since the required reworking now already takes place on hardened steel, this process is comparatively expensive.
Die vorliegende Erfindung beschäftigt sich daher mit dem Problem, für einen Rotor der gattungsgemäßen Art eine verbesserte oder zumindest eine alternative Ausführungsform anzugeben, welche insbesondere die Herstellung einer Axiallagereinheit für einen derartigen Rotor und damit den Rotor selbst vereinfacht und verbilligt. The present invention therefore deals with the problem of providing a rotor of the generic type an improved or at least one alternative embodiment, which in particular simplifies the manufacture of a thrust bearing unit for such a rotor and thus the rotor itself and cheaper.
Dieses Problem wird erfindungsgemäß durch den Gegenstand des unabhängigen Anspruchs 1 gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche. This problem is solved according to the invention by the subject matter of independent claim 1. Advantageous embodiments are the subject of the dependent claims.
Die vorliegende Erfindung beruht auf dem allgemeinen Gedanken, die Komponenten einer Axiallagereinheit, das heißt insbesondere die Dichtungsbuchse und/oder die Anlaufscheibe, aus einem einerseits leicht bearbeitbaren und andererseits kostengünstigen Material zu fertigen und erst anschließend in einer äußerst dünnen Randschicht zu härten und damit verschleißbeständig zu machen. Der erfindungsgemäße Rotor weist somit die zuvor erwähnte Dichtungsbuchse sowie eine Anlaufscheibe zur Axiallagerung als Bestandteil einer Axiallagereinheit auf, wobei die Dichtungsbuchse und/oder die Anlaufscheibe aus Stahl ausgebildet und nachträglich, mit einer harten Diffusionsschicht versehen sind, insbesondere gasnitriert oder nitrocarburiert, sind/ist. Durch das Gasnitrieren, insbesondere das Nitrocarburieren, wird der Stahl durch Aufsticken, das heißt durch äußerliches Zuführen von Stickstoff, in einer Randschicht gehärtet. Beim Gasnitrieren wird in der Regel einer Oberfläche Stickstoff zugeführt, wodurch Stickstoff in die Oberfläche eindiffundieren kann und dadurch eine sehr harte oberflächliche Verbindungsschicht entstehen kann. Je nach Behandlungszeit kann dabei die Schichtdicke variiert werden. Durch die Verwendung von herkömmlichem Stahl, beispielsweise Automatenstahl, insbesondere 42CrMoS4, können sowohl die Dichtungsbuchse als auch die Anlaufscheibe aus einem leicht bearbeitbaren und kostengünstigen Material hergestellt werden, welches aufgrund seiner vergleichsweise weichen Eigenschaften einfach bearbeitet werden kann. Erst nach dem Bearbeiten wird die Dichtungsbuchse bzw. die Anlaufscheibe nitriert bzw. nitrocarburiert und damit gehärtet. Das Bearbeiten der nun gehärteten Dichtungsbuchse bzw. Anlaufscheibe ist somit nicht mehr erforderlich, wodurch dieser vergleichsweise aufwändige und damit auch teure Bearbeitungsschritt entfallen kann. The present invention is based on the general idea to manufacture the components of a thrust bearing unit, that is, in particular the sealing bush and / or the thrust washer, from a readily machinable and cost-effective material and only then to harden in an extremely thin surface layer and thus wear-resistant do. The rotor according to the invention thus has the aforementioned sealing bushing and a thrust washer for axial bearing as part of a thrust bearing, wherein the sealing bush and / or the thrust washer formed of steel and subsequently provided with a hard diffusion layer, in particular gas nitrided or nitrocarburized, are / is. By gas nitriding, in particular nitrocarburizing, the steel is hardened by embroidering, that is to say by externally supplying nitrogen, in an edge layer. In gas nitriding, as a rule, nitrogen is supplied to a surface, which allows nitrogen to diffuse into the surface, thereby resulting in a very hard superficial bonding layer. Depending on the treatment time, the layer thickness can be varied. By using conventional steel, for example free cutting steel, particularly 42CrMoS4, both the sealing bushing and the thrust washer can be made of an easily machinable and inexpensive material which, because of its comparatively soft properties, can be easily machined. Only after machining the sealing bush or the thrust washer is nitrided or nitrocarburized and cured. The processing of the now hardened sealing bushing or thrust washer is thus no longer necessary, so that this comparatively complex and therefore expensive processing step can be omitted.
Zweckmäßig weist die beim Gasnitrieren hergestellte gehärtete Schicht eine Schichtdicke zwischen 4 und 14 µm auf. Durch diese vergleichsweise sehr dünne gehärtete Schicht ist es möglich, diese durch die Toleranzbreite der Abmaße bzw. in der Form und Lagetoleranz zu integrieren, so dass diese Schicht in den Fertigungsmaßen nicht vorgehalten werden muss. Sind größere Schichtdicken gewünscht, so müssen diese gegebenenfalls in den Fertigungsmaßen vorgehalten werden, um im beschichteten Zustand das Sollmaß zu erreichen. The hardened layer produced by gas nitriding expediently has a layer thickness between 4 and 14 μm. By means of this comparatively very thin hardened layer, it is possible to integrate these by the tolerance width of the dimensions or in the shape and position tolerance, so that this layer does not have to be kept in the production dimensions. If larger layer thicknesses are desired, they may need to be kept in the production dimensions in order to achieve the specified dimension in the coated state.
Zweckmäßig sind die in der Schicht vorhandenen Poren durch Nachoxidieren, insbesondere mit Magnetiden, gefüllt. Durch das Füllen der durch das Gasnitrieren entstehenden Poren der gehärteten Oberflächenschicht mittels Magnetiden kann eine sehr glatte Oberfläche geschaffen werden, die nicht nur den Reibbeiwert senkt, sondern zusätzlich auch eine äußerst hohe Verschleißbeständigkeit aufweist. Suitably, the pores present in the layer are filled by post-oxidation, in particular with magnetides. By filling the resulting by gas nitriding pores of the cured surface layer by means of magnetids, a very smooth surface can be created, which not only reduces the coefficient of friction, but also has an extremely high wear resistance.
Die vorliegende Erfindung beruht weiter auf dem allgemeinen Gedanken, zur Herstellung eines Rotors bzw. einer Axiallagereinheit desselben, eine Dichtungsbuchse bzw. eine Anlaufscheibe eines derartigen Axiallagers bzw. einer derartigen Axiallagereinheit aus herkömmlichem und vergleichsweise kostengünstigen und weichem Stahl auszubilden und erst nach der eigentlichen Bearbeitung zu härten, jedoch nicht komplett durchgehend, sondern lediglich in einer verantwortlichen Oberflächenschicht und hier durch Gasnitrieren, insbesondere Nitrocarburieren. Dies bietet den großen Vorteil, dass die Dichtungsbuchse bzw. die Anlaufscheibe mit normalen Werkzeugen bearbeitet werden kann und erst nach dem eigentlichen Bearbeiten gehärtet wird, wodurch ein aufwendiges und teures Bearbeiten gehärteter Bauteile entfällt. Durch die Oberflächenhärtung mittels des Gasnitrierens bzw. Nitrocarburierens kann jedoch eine verschleißbeständige oberflächenharte Schicht erzielt werden, welche eine lange Lebensdauer und eine hohe Verschleißbeständigkeit sichert. Als Stahl für die Dichtungsbuchse bzw. die Anlaufscheibe kann beispielsweise ein Automatenstahl, insbesondere ein 11SMn30 verwendet werden. The present invention is further based on the general idea, for the manufacture of a rotor or a thrust bearing unit thereof, to form a sealing bush or thrust washer of such a thrust bearing or bearing of conventional and relatively inexpensive and soft steel and only after the actual processing Harden, but not completely through, but only in a responsible surface layer and here by gas nitriding, especially nitrocarburizing. This offers the great advantage that the sealing bush or the thrust washer can be processed with normal tools and is cured only after the actual processing, whereby a complex and expensive processing of hardened components is eliminated. However, the surface hardening by means of gas nitriding or nitrocarburizing, a wear-resistant surface-hard layer can be achieved, which ensures a long life and high wear resistance. As a steel for the sealing bush or the thrust washer, for example, a free cutting steel, in particular a 11SMn30 can be used.
Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus der Zeichnung und aus der zugehörigen Figurenbeschreibung anhand der Zeichnung.Other important features and advantages of the invention will become apparent from the dependent claims, from the drawing and from the associated description of the figures with reference to the drawing.
Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.
Ein bevorzugtes Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung näher erläutert.A preferred embodiment of the invention is illustrated in the drawing and will be explained in more detail in the following description.
Die einzige
Entsprechend der
Die beim Gasnitrieren hergestellte, gehärtete Oberflächenschicht besitzt dabei eine Schichtdicke zwischen 4 und 14 µm und ist dadurch vergleichsweise dünn. Insbesondere kann sie dabei so dünn sein, dass sie nicht hinsichtlich von Fertigungsmaßen vorgehalten werden muss, sondern sich im Bereich einer Toleranzkette für Abmaße, beispielsweise in Form von Lage- und Formtoleranzen integrieren lässt. Durch die Härtung der Dichtungsbuchse
Durch das Gasnitrieren bzw. Nitrocarburieren kann die gehärtete Oberflächenschicht Poren aufweisen, welche erfindungsgemäß, insbesondere durch Magnetide, gefüllt werden. Hierdurch kann eine sehr glatte Oberfläche erreicht werden, welche sich nicht nur in Bezug auf einen verbesserten Reibbeiwert, sondern auch in Bezug auf eine verbesserte Verschleißbeständigkeit der Oberfläche auswirkt. By gas nitriding or nitrocarburizing, the hardened surface layer may have pores, which are filled according to the invention, in particular by magnetides. In this way, a very smooth surface can be achieved, which not only affects in terms of an improved coefficient of friction, but also in terms of improved wear resistance of the surface.
Erfindungsgemäß wird somit die Axiallagereinheit des Rotors
Mit dem erfindungsgemäßen Rotor
Claims (8)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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DE102014203841.3A DE102014203841A1 (en) | 2014-03-03 | 2014-03-03 | Rotor for an exhaust gas turbocharger |
PCT/EP2015/050571 WO2015132009A1 (en) | 2014-03-03 | 2015-01-14 | Rotor for a turbocharger, and associated production method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102014203841.3A DE102014203841A1 (en) | 2014-03-03 | 2014-03-03 | Rotor for an exhaust gas turbocharger |
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DE102014203841A1 true DE102014203841A1 (en) | 2015-09-03 |
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DE102014203841.3A Pending DE102014203841A1 (en) | 2014-03-03 | 2014-03-03 | Rotor for an exhaust gas turbocharger |
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WO (1) | WO2015132009A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160281645A1 (en) * | 2015-03-09 | 2016-09-29 | Caterpillar Inc. | Turbocharger and Method |
US9739238B2 (en) | 2015-03-09 | 2017-08-22 | Caterpillar Inc. | Turbocharger and method |
US9752536B2 (en) | 2015-03-09 | 2017-09-05 | Caterpillar Inc. | Turbocharger and method |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102016214174A1 (en) * | 2016-08-01 | 2018-02-01 | Minebea Co., Ltd. | Turbine shaft for a turbine wheel in an exhaust heat recovery system of an internal combustion engine, method for producing and using such |
Family Cites Families (5)
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US7647772B2 (en) * | 2006-03-14 | 2010-01-19 | Honeywell International Inc. | Surface treatment for variable geometry turbine |
US8197199B2 (en) * | 2008-06-09 | 2012-06-12 | GM Global Technology Operations LLC | Turbocharger housing with a conversion coating and methods of making the conversion coating |
DE102009056875B4 (en) * | 2009-12-03 | 2013-07-11 | Bosch Mahle Turbo Systems Gmbh & Co. Kg | Bearing housing, charging device and method for surface treatment of a bearing housing |
DE102010020213A1 (en) * | 2010-05-12 | 2011-11-17 | Bosch Mahle Turbo Systems Gmbh & Co. Kg | Charging device, in particular exhaust gas turbocharger for a motor vehicle |
DE102011075517A1 (en) * | 2010-06-29 | 2011-12-29 | Bosch Mahle Turbo Systems Gmbh & Co. Kg | Bearing housing for a charging device |
-
2014
- 2014-03-03 DE DE102014203841.3A patent/DE102014203841A1/en active Pending
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2015
- 2015-01-14 WO PCT/EP2015/050571 patent/WO2015132009A1/en active Application Filing
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160281645A1 (en) * | 2015-03-09 | 2016-09-29 | Caterpillar Inc. | Turbocharger and Method |
US9683520B2 (en) * | 2015-03-09 | 2017-06-20 | Caterpillar Inc. | Turbocharger and method |
US9739238B2 (en) | 2015-03-09 | 2017-08-22 | Caterpillar Inc. | Turbocharger and method |
US9752536B2 (en) | 2015-03-09 | 2017-09-05 | Caterpillar Inc. | Turbocharger and method |
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WO2015132009A1 (en) | 2015-09-11 |
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