WO2019166041A1 - Fluid bearing and wet rotor pump comprising such a bearing - Google Patents

Fluid bearing and wet rotor pump comprising such a bearing Download PDF

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Publication number
WO2019166041A1
WO2019166041A1 PCT/DE2019/100006 DE2019100006W WO2019166041A1 WO 2019166041 A1 WO2019166041 A1 WO 2019166041A1 DE 2019100006 W DE2019100006 W DE 2019100006W WO 2019166041 A1 WO2019166041 A1 WO 2019166041A1
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WO
WIPO (PCT)
Prior art keywords
bearing
sliding bearing
coating
hydrodynamic
hydrodynamic sliding
Prior art date
Application number
PCT/DE2019/100006
Other languages
German (de)
French (fr)
Inventor
Serge Kursawe
Wolfgang Scholz
Bertram Haag
Original Assignee
Schaeffler Technologies AG & Co. KG
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Publication of WO2019166041A1 publication Critical patent/WO2019166041A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F16C33/121—Use of special materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/047—Bearings hydrostatic; hydrodynamic
    • F04D29/0473—Bearings hydrostatic; hydrodynamic for radial pumps
    • 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
    • F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
    • 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
    • F16C33/043—Sliding surface consisting mainly of ceramics, cermets or hard carbon, e.g. diamond like carbon [DLC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1095—Construction relative to lubrication with solids as lubricant, e.g. dry coatings, powder
    • 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
    • F16C33/124—Details of overlays
    • 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
    • F16C2206/00—Materials with ceramics, cermets, hard carbon or similar non-metallic hard materials as main constituents
    • F16C2206/02—Carbon based material
    • F16C2206/04—Diamond like carbon [DLC]
    • 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
    • F16C2223/30—Coating surfaces
    • F16C2223/60—Coating surfaces by vapour deposition, e.g. PVD, CVD
    • 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
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/60—Thickness, e.g. thickness of coatings
    • 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
    • F16C2360/44—Centrifugal pumps

Definitions

  • the invention relates to a hydrodynamic sliding bearing and a wet-running pump, in particular heating pump or water pump, with such a hydrodynamic sliding bearing.
  • slide bearings have two relatively moving parts which slide against each other against the resistance caused by sliding friction. Between the two relatively moving parts of the sliding bearing is a lubricating film that must be put under pressure to separate the contact surfaces of the two parts against the bearing force. Slide bearings are divided into hydrodynamic and hydrostatic slide bearings. In hydrostatic plain bearings, the pressure in the supporting lubricating film layer is generated by an external pump.
  • DE 10 2011 077 556 A1 discloses a sliding bearing with a rotating friction partner and a mating partner.
  • either the friction partner or the mating partner is coated with a hard material, so that the friction is reduced in the hydrodynamic state and the wear resistance in mixed friction operation is increased.
  • a pump unit is disclosed with a sliding bearing.
  • the slide bearing is either completely made of a tribologically active plastic or only the inner region forming the sliding bearing is a layer of a a tribologically active material.
  • the sliding bearing has a shaft and a bearing carrier.
  • the bearing carrier can be coated.
  • Object of the present invention is to show a rational producible hydrodynamic slide bearing with an increased life.
  • the hydrodynamic slide bearing according to the invention has two friction partners which correspond to one another, at least one friction partner having an alloy and a coating arranged thereon, the electrochemical potential of the alloy being higher than the electrochemical potential of the coating.
  • both friction partners are made of a stainless metal.
  • stainless steel having a chromium content of at least 13 mass% may be used.
  • austenitic chromium-nickel steel such as steel with the material number 1.4301 or a steel with a similar high chromium content (17.5 to 19.5 mass%), comes into consideration.
  • the layer thickness of the coating is preferably between 3 pm and 20 pm, in particular between 5 pm and 10 pm.
  • the layer thickness of the coating is 7 pm.
  • the coating contains, for example, carbon layers, in particular amorphous carbon layers or CVD diamond layers.
  • CVD stands for Chemical Vapor Deposition.
  • Amorphous carbon is often also called diamond-like carbon (DLC) or diamond-like termed carbon.
  • the coating can be produced, for example, by the process which has already been disclosed in DE 10 2016 210 507 A1 by the applicant.
  • the coating contains a lubricating varnish. Regardless of whether the coating has bonded coating or carbon coatings, the coating can be made in one or more layers.
  • the coated friction partner is designed as a bearing bush.
  • the other friction partner is a shaft.
  • the bearing bush is preferably designed as a formed part.
  • the bearing bush is coated on the surface facing the other friction partner and on one end face.
  • the one friction partner preferably the bearing bush, is completely coated.
  • the wet-running pump according to the invention in particular heating pump or water pump, is characterized in that it has a hydrodynamic sliding bearing as described above.
  • the lubricating film of the hydrodynamic plain bearing corresponds to the medium that is conveyed through the wet-running pump.
  • Figure 2 shows an exemplary layer structure of the coated friction partner of a hydrodynamic sliding bearing according to the invention.
  • identical or equivalent parts are given the same reference numerals.
  • FIG. 1 shows an exemplary embodiment of a hydro-dynamic sliding bearing 1 according to the invention in a sectional view.
  • the hydrodynamic sliding bearing 1 is integrated here in a wet runner pump 2, not shown.
  • the hydrodynamic sliding bearing 1 has two mutually corresponding friction partners 3, 4.
  • the first friction partner 3 is designed as a bearing bush, while the second friction partner 4 represents a shaft.
  • Both friction partners 3, 4 of the hydrodynamic sliding bearing 1 are here made of a stainless steel.
  • the bearing bush 3 is formed here as a forming part and has a cylindrical shape with a formed on an end face of the bearing bush 3 flange 5.
  • the flange-side end face of the bearing bush 3 represents an axial thrust surface 6 for parts of the wet-running pump 2 in order to transmit axial forces.
  • the bearing bush 3 is completely alloyed. Furthermore, the bearing bush 3 of the hydrodynamic sliding bearing 1 is coated on the surface 7 facing the shaft 4 and on the axial abutment surface 6.
  • the coating 8 consists in this embodiment of amorphous carbon layers.
  • the coated friction partner 3 is here the bearing bush of the hydrodynamic sliding bearing 1.
  • the bearing bush 3 is made of a stainless steel and has an alloy layer 9.
  • a coating 8 is applied, which has a layer thickness D of 7 pm.
  • the alloy 9 in this case has a higher electrochemical potential than the coating 8, whereby pitting corrosion is avoided.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

The invention relates to a fluid bearing (1), comprising two mutually corresponding friction partners (3, 4). At least one friction partner (3) comprises an alloy (9) and a coating (8) arranged thereon, the electrochemical potential of the alloy (9) being higher than the electrochemical potential of the coating (8).

Description

Hydrodynamisches Gleitlager sowie Nassläuferpumpe mit einem solchen Gleitlager  Hydrodynamic plain bearing and wet-running pump with such a plain bearing
Die Erfindung betrifft ein hydrodynamisches Gleitlager sowie eine Nassläuferpumpe, insbesondere Heizungspumpe oder Wasserpumpe, mit einem solchen hydrodynami- schen Gleitlager. The invention relates to a hydrodynamic sliding bearing and a wet-running pump, in particular heating pump or water pump, with such a hydrodynamic sliding bearing.
Allgemein weisen Gleitlager zwei sich relativ zueinander bewegende Teile auf, die aufeinander gegen den durch Gleitreibung verursachten Widerstand gleiten. Zwischen den beiden relativ zueinander bewegenden Teilen des Gleitlagers befindet sich ein Schmierfilm, der unter Druck gesetzt werden muss, um die Kontaktflächen der beiden Teile gegen die Lagerkraft zu trennen. Gleitlager werden diesbezüglich in hydrodyna- mische und hydrostatische Gleitlager unterteilt. Bei hydrostatischen Gleitlagern wird der Druck in der tragenden Schmierfilmschicht durch eine externe Pumpe erzeugt.Generally, slide bearings have two relatively moving parts which slide against each other against the resistance caused by sliding friction. Between the two relatively moving parts of the sliding bearing is a lubricating film that must be put under pressure to separate the contact surfaces of the two parts against the bearing force. Slide bearings are divided into hydrodynamic and hydrostatic slide bearings. In hydrostatic plain bearings, the pressure in the supporting lubricating film layer is generated by an external pump.
Das heißt, dass bereits bei minimalen Geschwindigkeiten das hydrostatische Gleitla- ger sehr reibungsarm läuft. Im Vergleich dazu wird bei hydrodynamischen Gleitlagern der Druck durch die beiden zueinander bewegten Teile selbst erzeugt. Das bedeutet, dass beim Anlaufen oder Auslaufen der Bewegung nicht genügend Druck in der Schmierfilmschicht erzeugt werden kann, so dass eine Mischreibung entsteht. Das heißt, dass die Kontaktflächen der beiden zueinander bewegenden Teile teilweise di- rekt in Kontakt stehen ohne die schützende Schmierfilmschicht, wodurch ein hoher Verschleiß zustande kommt. This means that even at minimum speeds, the hydrostatic slide bearing runs very smoothly. In comparison, in hydrodynamic plain bearings, the pressure is generated by the two mutually moving parts themselves. This means that when starting or stopping the movement, not enough pressure can be generated in the lubricant film layer, so that mixed friction occurs. This means that the contact surfaces of the two mutually moving parts are partially directly in contact without the protective lubricating film layer, resulting in a high degree of wear.
In der DE 10 2011 077 556 A1 ist ein Gleitlager mit einem rotierenden Reibpartner und einem Gegenlaufpartner offenbart. Dabei ist entweder der Reibpartner oder der Gegenlaufpartner mit einem Hartstoff beschichtet, so dass die Reibung im hydrody- namischen Zustand reduziert und die Verschleißfestigkeit im Mischreibungsbetrieb er- höht wird. DE 10 2011 077 556 A1 discloses a sliding bearing with a rotating friction partner and a mating partner. In this case, either the friction partner or the mating partner is coated with a hard material, so that the friction is reduced in the hydrodynamic state and the wear resistance in mixed friction operation is increased.
In der DE 10 2013 004 339 A1 ist ein Pumpenaggregat mit einem Gleitlager offenbart. Das Gleitlager ist entweder vollständig aus einem tribologisch wirksamen Kunststoff hergestellt oder nur der das Gleitlager bildende innere Bereich ist eine Schicht aus ei- nem tribologisch wirksamen Material. Das Gleitlager weist eine Welle sowie einen La- gerträger auf. Der Lagerträger kann dabei beschichtet sein. In DE 10 2013 004 339 A1 discloses a pump unit is disclosed with a sliding bearing. The slide bearing is either completely made of a tribologically active plastic or only the inner region forming the sliding bearing is a layer of a a tribologically active material. The sliding bearing has a shaft and a bearing carrier. The bearing carrier can be coated.
Aufgabe der vorliegenden Erfindung ist es, ein rationeller herstellbares hydrodynami- sches Gleitlager mit einer erhöhten Lebensdauer aufzuzeigen. Object of the present invention is to show a rational producible hydrodynamic slide bearing with an increased life.
Zur Lösung der erfindungsgemäßen Aufgabe wird das im Anspruch 1 angegebene hydrodynamische Gleitlager und in Anspruch 10 eine Nassläuferpumpe mit einem sol- chen hydrodynamischen Gleitlager vorgeschlagen. Optionale vorteilhafte Ausgestal- tungen der Erfindung ergeben sich ganz oder teilweise aus den abhängigen Ansprü- chen. To achieve the object according to the invention, the hydrodynamic plain bearing specified in claim 1 and, in claim 10, a wet-running pump with such a hydrodynamic plain bearing are proposed. Optional advantageous embodiments of the invention arise wholly or partly from the dependent claims.
Das erfindungsgemäße hydrodynamische Gleitlager weist zwei miteinander korres- pondierende Reibpartner auf, wobei mindestens ein Reibpartner eine Legierung und eine darauf angeordnete Beschichtung aufweist, wobei das elektrochemische Potenti- al der Legierung höher ist als das elektrochemische Potential der Beschichtung. The hydrodynamic slide bearing according to the invention has two friction partners which correspond to one another, at least one friction partner having an alloy and a coating arranged thereon, the electrochemical potential of the alloy being higher than the electrochemical potential of the coating.
Dadurch wird beispielsweise Lochfraßkorrosion an dem beschichteten Reibpartner vermieden, dass wiederum die Verschleißbeständigkeit und somit auch die Lebens- dauer des hydrodynamischen Gleitlagers erhöht. As a result, for example, pitting corrosion on the coated friction partner is avoided, which in turn increases the wear resistance and thus also the service life of the hydrodynamic sliding bearing.
Vorzugsweise sind beide Reibpartner aus einem nichtrostenden Metall hergestellt. Zum Beispiel kann rostfreier Stahl mit einem Chromgehalt von mindestens 13 Mas- sen-% verwendet werden. Insbesondere kommt austenitischer Chrom-Nickel-Stahl, wie Stahl mit der Werkstoffnummer 1.4301 oder ein Stahl mit einem ähnlich hohen Chromgehalt (17,5 bis 19,5 Massen-%), in Betracht. Preferably, both friction partners are made of a stainless metal. For example, stainless steel having a chromium content of at least 13 mass% may be used. In particular, austenitic chromium-nickel steel, such as steel with the material number 1.4301 or a steel with a similar high chromium content (17.5 to 19.5 mass%), comes into consideration.
Die Schichtdicke der Beschichtung beträgt vorzugsweise zwischen 3 pm und 20 pm, insbesondere zwischen 5 pm und 10 pm. Beispielsweise beträgt die Schichtdicke der Beschichtung 7 pm. The layer thickness of the coating is preferably between 3 pm and 20 pm, in particular between 5 pm and 10 pm. For example, the layer thickness of the coating is 7 pm.
Ferner enthält die Beschichtung beispielsweise Kohlenstoffschichten, insbesondere amorphe Kohlenstoffschichten oder CVD-Diamantschichten. Die Abkürzung CVD steht für Chemical Vapour Deposition (chemische Gasphasenabscheidung). Amor- pher Kohlenstoff wird häufig auch als Diamond-like Carbon (DLC) oder diamantähnli- cher Kohlenstoff bezeichnet. Die Beschichtung kann beispielsweise nach dem Verfah- ren, das in der DE 10 2016 210 507 A1 bereits von der Anmelderin offenbart ist, her- gestellt sein. Alternativ enthält die Beschichtung einen Gleitlack. Unabhängig davon, ob die Beschichtung Gleitlack oder Kohlenstoffschichten aufweist, kann die Beschich- tung dabei ein- oder mehrlagig ausgeführt sein. Furthermore, the coating contains, for example, carbon layers, in particular amorphous carbon layers or CVD diamond layers. The abbreviation CVD stands for Chemical Vapor Deposition. Amorphous carbon is often also called diamond-like carbon (DLC) or diamond-like termed carbon. The coating can be produced, for example, by the process which has already been disclosed in DE 10 2016 210 507 A1 by the applicant. Alternatively, the coating contains a lubricating varnish. Regardless of whether the coating has bonded coating or carbon coatings, the coating can be made in one or more layers.
In einer vorteilhaften Ausführungsform ist der beschichtete Reibpartner als Lager- buchse ausgebildet. In dieser Ausführungsform stellt der andere Reibpartner eine Welle dar. Die Lagerbüchse ist dabei vorzugsweise als Umformteil ausgeführt. Bei- spielsweise ist die Lagerbüchse an der dem anderen Reibpartner zugewandten Flä- che und an einer Stirnseite beschichtet. Das heißt, dass das erfindungsgemäße hyd- rodynamische Gleitlager zusätzlich eine axiale Anlauffläche aufweist, mit der Axial- kräfte übertragen werden können. In an advantageous embodiment, the coated friction partner is designed as a bearing bush. In this embodiment, the other friction partner is a shaft. The bearing bush is preferably designed as a formed part. For example, the bearing bush is coated on the surface facing the other friction partner and on one end face. This means that the hydrodynamic sliding bearing according to the invention additionally has an axial contact surface with which axial forces can be transmitted.
In einer weiteren beispielhaften Ausführungsform ist der eine Reibpartner, vorzugs- weise die Lagerbüchse, komplett beschichtet. In a further exemplary embodiment, the one friction partner, preferably the bearing bush, is completely coated.
Die erfindungsgemäße Nassläuferpumpe, insbesondere Heizungspumpe oder Was- serpumpe, zeichnet sich dadurch aus, dass sie ein hydrodynamisches Gleitlager, wie oben beschrieben aufweist. Der Schmierfilm des hydrodynamischen Gleitlagers ent- spricht dem Medium, das durch die Nassläuferpumpe gefördert wird. The wet-running pump according to the invention, in particular heating pump or water pump, is characterized in that it has a hydrodynamic sliding bearing as described above. The lubricating film of the hydrodynamic plain bearing corresponds to the medium that is conveyed through the wet-running pump.
Weitere Einzelheiten, Merkmale, Merkmalskombinationen und Wirkungen auf der Ba- sis der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter, beispielhafter Ausführungsformen der Erfindung sowie aus den Zeichnungen. Diese zeigen in: Further details, features, feature combinations and effects on the basis of the invention will become apparent from the following description of preferred, exemplary embodiments of the invention and from the drawings. These show in:
Figur 1 eine beispielhafte Ausführungsform eines erfindungsgemäßen hydrody- namischen Gleitlagers in Schnittansicht, 1 shows an exemplary embodiment of a hydrodynamic sliding bearing according to the invention in sectional view,
Figur 2 ein beispielhafter Schichtaufbau des beschichteten Reibpartners eines erfindungsgemäßen hydrodynamischen Gleitlagers. ln allen Figuren sind gleiche oder gleichwirkende Teile mit denselben Bezugszeichen versehen. Figure 2 shows an exemplary layer structure of the coated friction partner of a hydrodynamic sliding bearing according to the invention. In all figures, identical or equivalent parts are given the same reference numerals.
In der Fig. 1 ist eine beispielhafte Ausführungsform eines erfindungsgemäßen hydro- dynamischen Gleitlagers 1 in Schnittansicht dargestellt. Das hydrodynamische Gleit- lager 1 ist hier in einer nicht weiter dargestellten Nassläuferpumpe 2 integriert. 1 shows an exemplary embodiment of a hydro-dynamic sliding bearing 1 according to the invention in a sectional view. The hydrodynamic sliding bearing 1 is integrated here in a wet runner pump 2, not shown.
Das hydrodynamische Gleitlager 1 weist zwei miteinander korrespondierende Reib- partner 3, 4 auf. Der erste Reibpartner 3 ist als Lagerbüchse ausgebildet, während der zweite Reibpartner 4 eine Welle darstellt. Beide Reibpartner 3, 4 des hydrodynami- schen Gleitlagers 1 sind hier aus einem rostfreien Stahl hergestellt. The hydrodynamic sliding bearing 1 has two mutually corresponding friction partners 3, 4. The first friction partner 3 is designed as a bearing bush, while the second friction partner 4 represents a shaft. Both friction partners 3, 4 of the hydrodynamic sliding bearing 1 are here made of a stainless steel.
Die Lagerbüchse 3 ist hier als Umformteil ausgebildet und weist eine zylindrische Form mit einem an einer Stirnseite der Lagerbüchse 3 ausgebildeten Flansch 5 auf. Die flanschseitige Stirnseite der Lagerbüchse 3 stellt eine axiale Anlauffläche 6 für Teile der Nassläuferpumpe 2 dar, um Axialkräfte zu übertragen. The bearing bush 3 is formed here as a forming part and has a cylindrical shape with a formed on an end face of the bearing bush 3 flange 5. The flange-side end face of the bearing bush 3 represents an axial thrust surface 6 for parts of the wet-running pump 2 in order to transmit axial forces.
In der dargestellten Ausführungsform ist die Lagerbüchse 3 komplett legiert. Ferner ist die Lagerbüchse 3 des hydrodynamischen Gleitlagers 1 an der der Welle 4 zuge- wandten Fläche 7 sowie an der axialen Anlauffläche 6 beschichtet. Die Beschichtung 8 besteht in dieser Ausführungsform aus amorphen Kohlenstoffschichten. In the illustrated embodiment, the bearing bush 3 is completely alloyed. Furthermore, the bearing bush 3 of the hydrodynamic sliding bearing 1 is coated on the surface 7 facing the shaft 4 and on the axial abutment surface 6. The coating 8 consists in this embodiment of amorphous carbon layers.
In der Fig. 2 ist der Schichtaufbau des beschichteten Reibpartners 3 in einer 2, the layer structure of the coated friction partner 3 in one
Schnittansicht dargestellt. Der beschichtete Reibpartner 3 ist hier die Lagerbüchse des hydrodynamischen Gleitlagers 1. Die Lagerbüchse 3 ist aus einem rostfreien Stahl hergestellt und weist eine Legierungsschicht 9 auf. Auf der Legierung 9 ist eine Beschichtung 8 aufgebracht, die eine Schichtdicke D von 7 pm aufweist. Die Legie- rung 9 weist dabei ein höheres elektrochemisches Potential auf als die Beschichtung 8, wodurch Lochfraßkorrosion vermieden wird. Bezuqszeichenliste Section view shown. The coated friction partner 3 is here the bearing bush of the hydrodynamic sliding bearing 1. The bearing bush 3 is made of a stainless steel and has an alloy layer 9. On the alloy 9, a coating 8 is applied, which has a layer thickness D of 7 pm. The alloy 9 in this case has a higher electrochemical potential than the coating 8, whereby pitting corrosion is avoided. LIST OF REFERENCES
1 Gleitlager 1 slide bearing
2 Nassläuferpumpe  2 wet-running pump
3 erster Reibpartner, Lagerbüchse  3 first friction partner, bearing bush
4 zweiter Reibpartner, Welle  4 second friction partner, shaft
5 Flansch  5 flange
6 axiale Anlauffläche  6 axial contact surface
7 Fläche  7 area
8 Beschichtung  8 coating
9 Legierung  9 alloy
D Schichtdicke D layer thickness

Claims

Patentansprüche claims
1. Hydrodynamisches Gleitlager (1 ), aufweisend zwei miteinander korrespondie- rende Reibpartner (3, 4), wobei mindestens ein Reibpartner (3) eine Legierung (9) und eine darauf angeordnete Beschichtung (8) aufweist, wobei das elektro- chemische Potential der Legierung (9) höher ist als das elektrochemische Po- tential der Beschichtung (8). 1. Hydrodynamic plain bearing (1), comprising two friction partners (3, 4) corresponding to one another, wherein at least one friction partner (3) comprises an alloy (9) and a coating (8) arranged thereon, wherein the electrochemical potential of the Alloy (9) is higher than the electrochemical potential of the coating (8).
2. Hydrodynamisches Gleitlager (1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass beide Reibpartner (3, 4) aus einem nichtrostenden Material hergestellt sind.  2. Hydrodynamic sliding bearing (1) according to claim 1, characterized in that both friction partners (3, 4) are made of a stainless material.
3. Hydrodynamisches Gleitlager (1 ) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Schichtdicke (D) der Beschichtung (8) zwischen 3 pm und 20 pm, insbesondere zwischen 5 pm und 10 pm, bevorzugt 7 pm beträgt.  3. hydrodynamic sliding bearing (1) according to claim 1 or 2, characterized in that the layer thickness (D) of the coating (8) between 3 pm and 20 pm, in particular between 5 pm and 10 pm, preferably 7 pm.
4. Hydrodynamisches Gleitlager (1 ) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Beschichtung (8) Kohlenstoffschichten, insbesondere amorphe Kohlenstoffschichten oder CVD-Diamantschichten, ent- hält.  4. Hydrodynamic sliding bearing (1) according to one of the preceding claims, characterized in that the coating (8) contains carbon layers, in particular amorphous carbon layers or CVD diamond layers.
5. Hydrodynamisches Gleitlager (1 ) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Beschichtung (8) einen Gleitlack enthält.  5. hydrodynamic sliding bearing (1) according to one of claims 1 to 3, characterized in that the coating (8) contains a lubricating varnish.
6. Hydrodynamisches Gleitlager (1 ) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der beschichtete Reibpartner (3) als Lager- buchse ausgebildet ist.  6. Hydrodynamic sliding bearing (1) according to one of the preceding claims, characterized in that the coated friction partner (3) is designed as a bearing bush.
7. Hydrodynamisches Gleitlager (1 ) nach Anspruch 6, dadurch gekennzeichnet, dass die Lagerbüchse (3) als Umformteil ausgeführt ist.  7. hydrodynamic sliding bearing (1) according to claim 6, characterized in that the bearing bush (3) is designed as a formed part.
8. Hydrodynamisches Gleitlager (1 ) nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, dass die Lagerbüchse (3) an der dem anderen Reibpartner (4) zugewandten Fläche (7) und an einer Stirnseite (6) beschichtet ist.  8. Hydrodynamic sliding bearing (1) according to one of claims 6 or 7, characterized in that the bearing bush (3) on the other friction partner (4) facing surface (7) and on an end face (6) is coated.
9. Hydrodynamisches Gleitlager (1 ) nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der eine Reibpartner (3) komplett beschichtet ist. 9. hydrodynamic sliding bearing (1) according to one of claims 1 to 8, characterized in that the one friction partner (3) is completely coated.
10. Nassläuferpumpe (2), insbesondere Heizungspumpe oder Wasserpumpe, mit einem hydrodynamischen Gleitlager (1 ) nach den Ansprüchen 1 bis 9. 10. wet runner pump (2), in particular heating pump or water pump, with a hydrodynamic sliding bearing (1) according to claims 1 to 9.
PCT/DE2019/100006 2018-02-28 2019-01-07 Fluid bearing and wet rotor pump comprising such a bearing WO2019166041A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018104541.7A DE102018104541A1 (en) 2018-02-28 2018-02-28 Hydrodynamic plain bearing and wet-running pump with such a plain bearing
DE102018104541.7 2018-02-28

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WO2019166041A1 true WO2019166041A1 (en) 2019-09-06

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020003140A1 (en) 2020-05-26 2021-12-02 KSB SE & Co. KGaA Centrifugal pump with at least one hydrodynamic slide bearing arrangement

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JP2003343481A (en) * 2002-05-22 2003-12-03 Koyo Seiko Co Ltd Pump
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DE102011077556A1 (en) 2011-06-15 2012-12-20 Schaeffler Technologies AG & Co. KG bearings
DE102013004339A1 (en) 2013-03-14 2014-09-18 Wilo Se Pump unit with a one-piece bearing unit
US20170058616A1 (en) * 2015-08-26 2017-03-02 Summit Esp, Llc Abrasion resistance in well fluid wetted assemblies
DE102016210507A1 (en) 2016-06-14 2017-12-14 Schaeffler Technologies AG & Co. KG Method for producing a sliding surface on a machine element and machine element

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AT407532B (en) * 1998-07-29 2001-04-25 Miba Gleitlager Ag COMPOSITE OF AT LEAST TWO LAYERS
AT503735B1 (en) * 2006-06-09 2008-05-15 Miba Gleitlager Gmbh COMPOSITE STOCK

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JP2003343481A (en) * 2002-05-22 2003-12-03 Koyo Seiko Co Ltd Pump
EP2103711A1 (en) * 2006-12-28 2009-09-23 JTEKT Corporation Highly corrosion-resistant members and processes for production thereof
US20090052822A1 (en) * 2007-08-24 2009-02-26 Ggb, Inc. Metal-Backed Plain Bearing
DE102011077556A1 (en) 2011-06-15 2012-12-20 Schaeffler Technologies AG & Co. KG bearings
DE102013004339A1 (en) 2013-03-14 2014-09-18 Wilo Se Pump unit with a one-piece bearing unit
US20170058616A1 (en) * 2015-08-26 2017-03-02 Summit Esp, Llc Abrasion resistance in well fluid wetted assemblies
DE102016210507A1 (en) 2016-06-14 2017-12-14 Schaeffler Technologies AG & Co. KG Method for producing a sliding surface on a machine element and machine element

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