WO2013020880A1 - Ensemble palier lubrifié à utiliser dans un milieu corrosif, en particulier de l'eau de mer - Google Patents

Ensemble palier lubrifié à utiliser dans un milieu corrosif, en particulier de l'eau de mer Download PDF

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Publication number
WO2013020880A1
WO2013020880A1 PCT/EP2012/065089 EP2012065089W WO2013020880A1 WO 2013020880 A1 WO2013020880 A1 WO 2013020880A1 EP 2012065089 W EP2012065089 W EP 2012065089W WO 2013020880 A1 WO2013020880 A1 WO 2013020880A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing
mpa
sliding
component
shaft
Prior art date
Application number
PCT/EP2012/065089
Other languages
German (de)
English (en)
Inventor
Sven Claus
Frank Forbrig
Frank Straub
Original Assignee
Schaeffler Technologies AG & 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 Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Publication of WO2013020880A1 publication Critical patent/WO2013020880A1/fr

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
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/12—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load
    • F16C17/14—Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load specially adapted for operating in water
    • 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
    • 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
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/02—Mechanical properties
    • F16C2202/04—Hardness
    • 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
    • F16C2202/02—Mechanical properties
    • F16C2202/06—Strength or rigidity
    • 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
    • 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
    • F16C2204/70—Ferrous alloys, e.g. steel alloys with chromium as the next major constituent
    • 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
    • F16C2326/00—Articles relating to transporting
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/30—Ships, e.g. propelling shafts and bearings therefor

Definitions

  • the invention relates to a media-lubricated bearing arrangement for use in a corrosive medium, in particular seawater, comprising a component to be stored, in particular a shaft, as well as at least one sliding bearing bearing it with a lining carrier and a sliding lining resting thereon.
  • Such media-lubricated bearing assemblies are used, for example, in the field of energy production from water, river and marine power as well as the operation of underwater technical equipment.
  • Examples of such applications are Flusskraft- and Meeresstromkraftwerke, but also floodgates, arranged on the seabed borehole pumps for the maritime production of oil or natural gas and mining equipment z.
  • Such structures and machines usually have bearings that are located below the water surface.
  • ocean current power plants based on horizontal and / or vertical rotors have classical radial and / or axial bearing locations which are formed by means of a suitable bearing arrangement. Since the bearings are under water, is a use of conventional oil-lubricated gearbox including shielding and encapsulation of the surrounding medium is not appropriate.
  • bearing arrangements are expedient, which are extremely robust, since repair and maintenance work are often scarcely possible or only under extremely difficult conditions. For these reasons, offer media-lubricated plain bearings, which are often designed as a thin-ring bearing in view of the large bore diameter at comparatively small bearing cross-sections and without conventional seal lubricants, but are media-lubricated.
  • the main requirements of the sliding bearing or the bearing assembly for use under water ie in corrosive environment, corrosion resistance, wear resistance and static and dynamic strength. These main requirements are significantly influenced by the material system of the plain bearing, consisting essentially of sliding coating, housing respectively carrier of the sliding lining and the opposing member, usually a shaft for radial bearings or a disc for thrust bearings.
  • the counter-rotating component As a material for the counter-rotating component, ie the sliding, come high-alloy corrosion-resistant steels based on austenitic structure, such.
  • B. 42CrMo4 with hard chrome layer for use However, conventional high-alloy austenite-based and corrosion-resistant steels and duplex steels can not or do not harden sufficiently. Values of over 50HRC can hardly be achieved, but curing above 50HRC is required to operate a plain bearing at minimum.
  • a disadvantage of applied hard coatings are potential defects, which can not be avoided. Frequently, such layers in a chemical deposition method such. B. applied to a PVD process, where often so-called "pinholes" arise, the targets for any corrosion phenomena such as pitting and contact corrosion and the onset of sub-migrations, in which the water between the base material and the coating passes, with the result As a result of the spalling, microzones are formed in which chloride ions concentrate and, as a result, increased corrosion occurs, and in the case of coatings there is always the risk that the adhesion will be insufficient, that they will partially fail and If parts of the coating come loose, they reach the area of the sliding contact and have an abrasive effect, resulting in wear and failure of the bearing.
  • the invention is thus based on the problem to provide a media-lubricated bearing assembly, which is suitable for use in a corrosive medium, ie under water, and has excellent corrosion resistance, wear resistance as well as static and dynamic strength has.
  • the component in particular the shaft, consists of a corrosion-resistant steel with a hardness> 50 HRC, a yield strength> 1500 MPa, a tensile strength> 1900 MPa and a bending fatigue strength> 300 MPa. It has been found that a combination of a plain bearing with a sliding partner, which has the described mechanical parameters, can realize an extremely stable and durable bearing assembly, which is also particularly suitable for extreme use under water, especially in seawater.
  • the mating partner is made of corrosion-resistant steel, which is a mandatory requirement for use in corrosive environments.
  • the material used is characterized by a high flexural fatigue strength of at least 300 MPa, in order to be able to withstand the dynamic stresses that are encountered during use.
  • a martensitic steel in the form of a cold work steel is preferably used.
  • An excellent steel according to the invention is X30CrMoN15-1, which far exceeds all the properties mentioned in the introduction, which are given as minimum values.
  • This steel which is used by the applicant under the trade name "Cronidur 30", for example, is a high-performance steel for the manufacture of rolling bearings Corrosion resistance (more than 1000 hours in the salt spray test), wear resistance (with hardness greater than 58 HRC), yield strength of at least 1850 MPa, tensile strength of at least 2150 MPa and flexural fatigue strength of well over 300 MPa Fatigue life of the sliding-bearing component, such as a shaft can be greatly increased.
  • X30CrMoN15-1 is a pressure-bonded, highly corrosion-resistant martensitic cold work tooling with superior forgiveness. hardness up to 60 HRC. It has an excellent corrosion resistance, which is achieved on its alloy and the special heat treatment during production (melting, remelting under pressure, introduction of nitrogen during remelting and thereby substitution of the carbon, vacuum hardening, freezing).
  • the alloying element nitrogen plays a central role in the context of the carbon and chromium present in the material. Because of the resulting formation of finely divided carbonitrides, this material is characterized by a very high mechanical strength, compared with other steels of storage technology such. B. 100Cr6. The corrosion resistance is ensured by a high Cr content, in particular to dissolved chromium after the heat treatment. In addition, the nitrogen atoms deposit in defects of the material matrix and thus support or improve the corrosion resistance again.
  • This steel is now used according to the invention for the production of the sliding partner, so that in conjunction with the heavy-duty sliding bearing, which is designed according to the invention for a surface pressure of at least 30 MPa, results in an extremely durable, media-lubricated and also usable in a highly corrosive environment bearing arrangement ,
  • the component may for example be a shaft and the sliding bearing is a radial bearing in the form of a bearing bush, which carries the sliding coating.
  • the component may also be an axial disk and the sliding bearing may be a thrust bearing in the form of an axial disk with a sliding lining.
  • the bearing sizes can ultimately be arbitrary, ranging from bearing diameters in the range of a few millimeters (for example, with a very small shaft diameter) up to bearing diameters in the range of 100 ... 3000 mm and more, in particular radial bearing bushes with diameters of more than 10000 mm readily are feasible. Short description of the drawing
  • a bearing assembly 1 which serves for application in a corrosive medium, such as here, for example, water 2.
  • a corrosive medium such as here, for example, water 2.
  • the bearing assembly is completely under water during operation, for example seawater.
  • a component 3 to be stored here in the form of a shaft 4, which carries a propeller 5 by way of example only, and which runs into a housing 6, in which downstream operating components, for example, an energy-generating motor or the like are arranged.
  • the bearing assembly 1 further comprises a shaft bearing 4 bearing slide bearing 7 in the form of a radial bearing 8, consisting of a bearing bush 9 with applied sliding coating 10.
  • the bearing bush 9 is inserted into a corresponding Aufbloodung of the housing 6.
  • the material from which the shaft 4 is made is a martensitic steel, according to the invention, the steel X30CrMoN15-1 is used.
  • the shaft of this steel has a hardness of about 58 HRC, its yield strength is about 1850 MPa, its tensile strength at about 2150 MPa and their bending fatigue strength at more than 300 MPa.
  • the fracture toughness is more than 20
  • the excellent mechanical strength parameters of the steel X30CrMoN15-1 are achieved by the special heat treatment of the starting material.
  • the steel consists of the following components: C: 0.25-0.35% by weight
  • this material is evenly heated to a temperature of approx. 780 - 820 ° C, with a holding time after complete heating of approx. 8 hours.
  • the stress relief annealing is carried out by heating to approx. 600 - 650 ° C with a holding time of approx. 2 hours after complete heating. Thereafter, it is cooled to about 350 ° C, after which the component is cooled in air.
  • the hardening process takes place at an austenitizing temperature between 1000 and 1030 ° C, depending on the product requirement.
  • the hardening temperature is approximately 1030 ° C.
  • Hardening takes place in vacuo at a nitrogen partial pressure of 100-200 mbar.
  • the component is cooled by oil quenching, followed by a freezing step at about -80 ° C for about 60 minutes, followed by a final tempering occurs.
  • HRC> 58, yield strength about 1850 MPa, tensile strength about 2150 MPa, elongation at break about 3%, fracture toughness> 20 MPa Vm can be achieved.
  • the bushing 9 may for example also consist of this material, otherwise, another, sufficiently corrosion-resistant steel (including austenitic steel) can be used to form the bush 9.
  • the sliding lining 10 is preferably made of plastic, for example PTFE or another sliding plastic, for example based on rubber. It is also conceivable to use a ceramic, for example SiC, as a sliding coating.
  • the plain bearing in one piece, for example plastic, by, for example, a PTFE thread wound and potted with an epoxy resin, so that there is a sliding sleeve, which directly into the housing receptacle is used.
  • the sleeve or socket made of ceramic, z. As SiC be.
  • a radial bearing is shown in the figure, it is of course also conceivable to form a corresponding thrust bearing.
  • the thrust bearing would then consist of a corresponding thrust washer with applied sliding coating.
  • the sliding partner which runs on the sliding surface and is also preferably made of X30CrMoN15-1, would then be a corresponding axial disc, wherein of course the axial disc associated components, such as an axle mounted thereon or the like, if appropriate, may also consist of this steel.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

L'invention concerne un ensemble palier lubrifié à utiliser dans un milieu corrosif, en particulier de l'eau de mer, qui comprend un élément à supporter, en particulier un arbre, ainsi qu'au moins un palier lisse pourvu d'un porte-garniture et d'une garniture de glissement placée sur l'élément. L'élément (3), en particulier l'arbre (4) est constitué d'un acier résistant à la corrosion ayant une dureté > 50 HRC, une limite d'étirage > 1500 MPa, une résistance à la traction > 1900 MPa et une résistance à la flexion alternée > 300 MPa.
PCT/EP2012/065089 2011-08-09 2012-08-02 Ensemble palier lubrifié à utiliser dans un milieu corrosif, en particulier de l'eau de mer WO2013020880A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011080681.4 2011-08-09
DE102011080681A DE102011080681A1 (de) 2011-08-09 2011-08-09 Mediengeschmierte Lageranordnung zur Anwendung in einem korrosiven Medium, insbesondere Meerwasser

Publications (1)

Publication Number Publication Date
WO2013020880A1 true WO2013020880A1 (fr) 2013-02-14

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PCT/EP2012/065089 WO2013020880A1 (fr) 2011-08-09 2012-08-02 Ensemble palier lubrifié à utiliser dans un milieu corrosif, en particulier de l'eau de mer

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Country Link
DE (1) DE102011080681A1 (fr)
WO (1) WO2013020880A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150167734A1 (en) * 2013-12-18 2015-06-18 Skf Magnetic Mechatronics Thrust disc, magnetic bearing and apparatus
WO2015094728A1 (fr) * 2013-12-20 2015-06-25 General Electric Company Paliers de butée pour pompes centrifuges

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0791760A2 (fr) * 1996-02-20 1997-08-27 Ebara Corporation Palier ou joint lubrifié à l'eau
DE102008024055A1 (de) * 2008-05-16 2009-11-19 Schaeffler Kg Lagerring und Lager mit funktionsbezogenem Werkstoffverbund

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0791760A2 (fr) * 1996-02-20 1997-08-27 Ebara Corporation Palier ou joint lubrifié à l'eau
DE102008024055A1 (de) * 2008-05-16 2009-11-19 Schaeffler Kg Lagerring und Lager mit funktionsbezogenem Werkstoffverbund

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150167734A1 (en) * 2013-12-18 2015-06-18 Skf Magnetic Mechatronics Thrust disc, magnetic bearing and apparatus
EP2886890A1 (fr) * 2013-12-18 2015-06-24 Skf Magnetic Mechatronics Disque de poussée, palier magnétique et appareil
US10393174B2 (en) 2013-12-18 2019-08-27 Skf Magnetic Mechatronics Thrust disc, magnetic bearing and apparatus
WO2015094728A1 (fr) * 2013-12-20 2015-06-25 General Electric Company Paliers de butée pour pompes centrifuges

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Publication number Publication date
DE102011080681A1 (de) 2013-02-14

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