WO2018050159A1 - Bearing ring with an electrically insulating coating and method for producing an electrically insulating coating - Google Patents

Bearing ring with an electrically insulating coating and method for producing an electrically insulating coating Download PDF

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Publication number
WO2018050159A1
WO2018050159A1 PCT/DE2017/100745 DE2017100745W WO2018050159A1 WO 2018050159 A1 WO2018050159 A1 WO 2018050159A1 DE 2017100745 W DE2017100745 W DE 2017100745W WO 2018050159 A1 WO2018050159 A1 WO 2018050159A1
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WO
WIPO (PCT)
Prior art keywords
electrically insulating
insulating coating
bearing ring
base body
plastic
Prior art date
Application number
PCT/DE2017/100745
Other languages
German (de)
French (fr)
Inventor
Georg SMOLORZ
Björn Müller
Milan Madron
Original Assignee
Schaeffler Technologies AG & Co. KG
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Publication of WO2018050159A1 publication Critical patent/WO2018050159A1/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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F16C33/586—Details of specific parts of races outside the space between the races, e.g. end faces or bore of inner ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/64—Special methods of manufacture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C2202/10—Porosity
    • 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
    • F16C2202/32—Conductivity
    • 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
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/02—Plastics; Synthetic resins, e.g. rubbers comprising fillers, fibres
    • 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
    • F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
    • F16C2208/20—Thermoplastic resins
    • 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
    • F16C2223/42—Coating surfaces by spraying the coating material, e.g. plasma spraying
    • 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

Definitions

  • the invention relates to a bearing ring with an electrically insulating coating and a method for applying an electrically insulating coating and the use of a thermal spraying process for producing an electrically insulating coating.
  • the field of application of the invention extends primarily to rolling bearings for electrical machines, in particular for vehicles and wind turbines.
  • DE 10 2013 104 186 A1 discloses a bearing ring with a body which has an electrically insulating coating of a ceramic layer with pores and a plastic for filling the pores and coating the ceramic layer.
  • the pores in the ceramic layer have a proportion of 10 to 50%.
  • the object of the invention is to further develop a bearing ring for an electrical machine, and in particular to increase the insulating properties of the bearing ring against AC voltages.
  • a bearing ring according to the invention for an electrical machine comprises an electrically insulating coating which is formed at least partially on a base body of the bearing ring and which is formed from a thermally sprayed plastic.
  • the electrically insulating coating consists of an electrically insulating plastic, which is applied to the base body of the bearing ring by a surface coating method according to the thermal spraying.
  • the electrically insulating plastic may be, for example, a polyetheretherketone (PEEK) or a polyphthalamide (PPA).
  • PEEK polyetheretherketone
  • PPA polyphthalamide
  • Polyetheretherketone has a dielectric constant of 3, whereby the dielectrics of polyphthalamide 4. Such a low dielectric constant has a positive effect on the insulating properties of the electrically insulating coating at alternating voltages.
  • Ceramics used for electrical insulation generally have a significantly higher dielectric constant of 8 to 9.
  • the inventive electrically insulating coating with plastic thus brings a significantly higher capacitive resistance compared with the prior art described above, so that the insulation performance increases and thus the bearing ring according to the invention improved insulation against high-frequency currents in a bearing, in particular a ball or roller bearings, allows.
  • the value of the dielectric constant due to the electrically insulating coating with plastic is more favorable than in the known from the prior art composite layer of ceramic and plastic.
  • the electrical insulation properties at AC voltages are not only dependent on the dielectric constant of the coating material, but also on the layer thickness of the electrically insulating coating.
  • the electrically insulating coating preferably has a layer thickness of 0.05 to 1 mm. Depending on the application, the layer thickness of the electrically insulating coating can vary.
  • the electrically insulating coating preferably comprises reinforcing fibers and / or reinforcing particles in order to improve the mechanical properties.
  • the electrically insulating plastic comprises reinforcing fibers or reinforcing particles of carbon and / or glass and / or aramid.
  • other reinforcing elements or reinforcing materials are conceivable.
  • the basic body of the bearing ring is coated by means of flame spraying.
  • wire flame spraying a wire-shaped spray material is melted by a fuel gas-oxygen flame, compressed air sprayed the melted spray material, in particular the electrically insulating plastic and flings on the substrate provided as the basic body.
  • powder flame spraying is based on the same principle of operation as the wire flame spraying zen, with the difference that the coating material, in particular the electrically insulating plastic is not wire-shaped but powder-shaped.
  • the basic body of the bearing ring is preferably coated by means of high-speed spraying (HVOF), in particular using a powder as the spray material.
  • HVOF high-speed spraying
  • the electrically insulating coating is formed.
  • the electrically insulating coating is applied to an outside of the base body, on two opposite side surfaces of the base body, on a respective fillet of the base body formed between the outside and each side face, and on a respective chamfer of the base body extending from each side face to an inside of the base body.
  • both bearing rings of a roller bearing are at least partially or completely coated with the electrically insulating coating. Consequently, it is also conceivable to coat the inner ring of the rolling bearing.
  • the thermal spraying in particular the flame spraying for melting and Beför- the electrically insulating plastic is used on the base body.
  • plastics are processed by injection molding.
  • an injection mold would be required for each design and layer thickness.
  • the electrically insulating coating is sealed with at least superficial pores with a resin or a polymer.
  • the electrically insulating coating is mechanically processed.
  • the electrically insulating coating is mechanically processed by grinding or polishing in order to preferably adjust the layer thickness of the electrically insulating coating.
  • Figure 1 is a schematic sectional view of a bearing ring according to the invention with an electrically insulating coating
  • Figure 2 is a simplified schematic sectional view of a base body with an electrically insulating coating according to the invention.
  • an inventive bearing ring for an electric machine (not shown here) has a base body 1, on which an electrically insulating coating 2 made of a thermally sprayed plastic is formed. Consequently, the plastic is injected in particular by flame spraying directly onto the base body 1 in order to produce the electrically insulating coating 2.
  • the electrically insulating coating 2 is on an outer side 3 of the base body 1, on two opposite side surfaces 4a, 4b of the main body 1, on a respective between the outer side 3 and each side surface 4a, 4b formed rounding 5a, 5b of the base body 1 and on a respective chamfer 7a, 7b of the base body 1 extending from each side surface 4a, 4b to an inner side 6 of the base body 1.
  • a basic body 1 according to the invention has an electrically insulating coating 2 of a thermally sprayed plastic, the electrically insulating coating 2 comprising reinforcing fibers and / or reinforcing particles 8 for improving the mechanical properties.
  • the electrically insulating coating 2 machined. Furthermore, the electrically insulating coating 2 was sealed for filling - not shown here - pores.

Abstract

The invention relates to a bearing ring for an electrical machine, comprising an electrically insulating coating (2) at least partially implemented on a main body (1) of the bearing ring, wherein the electrically insulating coating (2) is formed from a thermal sprayed plastic. The invention further relates to a method for at least partially applying an electrically insulating coating (2) on a main body (1) of a bearing ring, wherein the electrically insulating coating (2) is formed by thermal spraying of a plastic. The invention further relates to the use of thermal spraying for producing an electrically insulating coating (2) made of a plastic on a main body (1) of a bearing ring.

Description

Lagerring mit einer elektrisch isolierenden Beschichtung sowie Verfahren zur Herstellung einer elektrisch isolierenden Beschichtung  Bearing ring with an electrically insulating coating and method for producing an electrically insulating coating
Die Erfindung betrifft einen Lagerring mit einer elektrisch isolierenden Beschichtung sowie ein Verfahren zum Aufbringen einer elektrisch isolierenden Beschichtung und die Verwendung eines thermischen Spritzprozesses zur Herstellung einer elektrisch isolierenden Beschichtung. Das Anwendungsgebiet der Erfindung erstreckt sich vornehmlich auf Wälzlager für elektrische Maschinen, insbesondere für Fahrzeuge und Windkraftanlagen. The invention relates to a bearing ring with an electrically insulating coating and a method for applying an electrically insulating coating and the use of a thermal spraying process for producing an electrically insulating coating. The field of application of the invention extends primarily to rolling bearings for electrical machines, in particular for vehicles and wind turbines.
Allgemein ist bekannt, dass ein elektrischer Stromdurchgang durch ein Lager zu einer Beschädigung des Lagers führen kann. Es besteht daher ein Bedarf an elektrisch isolierenden Lagern, insbesondere an elektrisch isolierenden Lagerringen. Die DE 10 2013 104 186 A1 offenbart einen Lagerring, mit einem Korpus, der eine elektrisch isolierende Beschichtung aus einer Keramikschicht mit Poren und einen Kunststoff zum Verfüllen der Poren und Beschichten der Keramikschicht aufweist. Dabei besitzen die Poren in der Keramikschicht einen Anteil von 10 bis 50%. It is generally known that an electrical current passage through a bearing can lead to damage of the bearing. There is therefore a need for electrically insulating bearings, in particular on electrically insulating bearing rings. DE 10 2013 104 186 A1 discloses a bearing ring with a body which has an electrically insulating coating of a ceramic layer with pores and a plastic for filling the pores and coating the ceramic layer. The pores in the ceramic layer have a proportion of 10 to 50%.
Die Aufgabe der Erfindung besteht darin, einen Lagerring für eine elektrische Maschine weiterzuentwickeln, und insbesondere die Isolationseigenschaften des Lagerrings gegenüber Wechselspannungen zu erhöhen. The object of the invention is to further develop a bearing ring for an electrical machine, and in particular to increase the insulating properties of the bearing ring against AC voltages.
Ein erfindungsgemäßer Lagerring für eine elektrische Maschine umfasst eine zumin- dest teilweise an einem Grundkorpus des Lagerrings ausgebildete elektrisch isolierende Beschichtung, die aus einem thermisch gespritzten Kunststoff ausgebildet ist. Mit anderen Worten besteht die elektrisch isolierende Beschichtung aus einem elektrisch isolierenden Kunststoff, der durch ein Oberflächenbeschichtungsverfahren gemäß dem thermischen Spritzen auf den Grundkorpus des Lagerrings aufgebracht wird. Somit befindet sich keine weitere Beschichtung auf dem Grundkorpus des Lagerrings, insbesondere keine Keramikschicht. Der elektrisch isolierende Kunststoff kann beispielsweise ein Polyetheretherketon (PEEK) oder ein Polyphthalamid (PPA) sein. Polyetheretherketon weist eine Dielektrizitätszahl von 3, wobei die Dielektrizi- tätszahl von Polyphthalamid 4 beträgt. Eine derart geringe Dielektrizitätszahl wirkt sich positiv auf die Isolationseigenschaften der elektrisch isolierenden Beschichtung bei Wechselspannungen aus. Zur elektrischen Isolation verwendete Keramiken weisen in der Regel eine deutlich höhere Dielektrizitätszahl von 8 bis 9 auf. A bearing ring according to the invention for an electrical machine comprises an electrically insulating coating which is formed at least partially on a base body of the bearing ring and which is formed from a thermally sprayed plastic. In other words, the electrically insulating coating consists of an electrically insulating plastic, which is applied to the base body of the bearing ring by a surface coating method according to the thermal spraying. Thus, there is no further coating on the base body of the bearing ring, in particular no ceramic layer. The electrically insulating plastic may be, for example, a polyetheretherketone (PEEK) or a polyphthalamide (PPA). Polyetheretherketone has a dielectric constant of 3, whereby the dielectrics of polyphthalamide 4. Such a low dielectric constant has a positive effect on the insulating properties of the electrically insulating coating at alternating voltages. Ceramics used for electrical insulation generally have a significantly higher dielectric constant of 8 to 9.
Die erfindungsgemäße elektrisch isolierende Beschichtung mit Kunststoff bringt gegenüber dem einleitend beschriebenen Stand der Technik somit einen deutlich höheren kapazitiven Widerstand, so dass damit die Isolationsleistung steigt und somit der erfindungsgemäße Lagerring eine verbesserte Isolation gegen hochfrequente Ströme in einem Lager, insbesondere einem Kugel- oder Rollenlager, ermöglicht. Es wird darauf hingewiesen, dass erfindungsgemäß der Wert der Dielektrizitätszahl aufgrund der elektrisch isolierenden Beschichtung mit Kunststoff günstiger als bei der aus dem Stand der Technik bekannten Verbundschicht aus Keramik und Kunststoff ist. Die elektrischen Isolationseigenschaften bei Wechselspannungen sind nicht nur von der Dielektrizitätszahl des Beschichtungsmaterials, sondern auch von der Schichtdicke der elektrisch isolierenden Beschichtung abhängig. Die elektrisch isolierende Beschichtung weist vorzugsweise eine Schichtdicke von 0,05 bis 1 mm auf. Je nach Anwendungsfall kann die Schichtdicke der elektrisch isolierenden Beschichtung variie- ren. The inventive electrically insulating coating with plastic thus brings a significantly higher capacitive resistance compared with the prior art described above, so that the insulation performance increases and thus the bearing ring according to the invention improved insulation against high-frequency currents in a bearing, in particular a ball or roller bearings, allows. It should be noted that according to the invention, the value of the dielectric constant due to the electrically insulating coating with plastic is more favorable than in the known from the prior art composite layer of ceramic and plastic. The electrical insulation properties at AC voltages are not only dependent on the dielectric constant of the coating material, but also on the layer thickness of the electrically insulating coating. The electrically insulating coating preferably has a layer thickness of 0.05 to 1 mm. Depending on the application, the layer thickness of the electrically insulating coating can vary.
Bevorzugt umfasst die elektrisch isolierende Beschichtung zur Verbesserung der mechanischen Eigenschaften Verstärkungsfasern und/oder Verstärkungspartikel. Beispielsweise umfasst der elektrisch isolierende Kunststoff Verstärkungsfasern oder Verstärkungspartikel aus Carbon und/oder Glas und/oder Aramid. Ferner sind auch andere Verstärkungselemente bzw. Verstärkungsstoffe denkbar. The electrically insulating coating preferably comprises reinforcing fibers and / or reinforcing particles in order to improve the mechanical properties. For example, the electrically insulating plastic comprises reinforcing fibers or reinforcing particles of carbon and / or glass and / or aramid. Furthermore, other reinforcing elements or reinforcing materials are conceivable.
Insbesondere wird der Grundkorpus des Lagerrings mittels Flammspritzen beschichtet. In der Technik wird zwischen Drahtflammspritzen und Pulverflammspritzen unter- schieden. Beim Drahtflammspritzen wird ein drahtförmiger Spritzwerkstoff durch eine Brenngas-Sauerstoff-Flamme abgeschmolzen, wobei Druckluft den aufgeschmolzenen Spritzwerkstoff, insbesondere den elektrisch isolierenden Kunststoff verdüst und auf den als Substrat vorgesehenen Grundkorpus schleudert. Demgegenüber basiert das Pulverflammspritzen auf dem gleichen Funktionsprinzip wie das Drahtflammsprit- zen, mit dem Unterschied, dass der Beschichtungswerkstoff, insbesondere der elektrisch isolierende Kunststoff nicht drahtförmig sondern pulverförmig ausgebildet ist. Bevorzugt wird der Grundkorpus des Lagerrings mittels Hochgeschwindigkeitsf lammspritzen (HVOF), insbesondere unter Verwendung eines Pulvers als Spritzwerkstoff beschichtet. Beim Hochgeschwindigkeitsflammspritzen erfolgt eine kontinuierliche Kraftstoffverbrennung unter hohem Druck innerhalb einer wasser- oder luftgekühlten Brennkammer. Der in der Brennkammer erzeugte Druck eines brennenden Kraftstoff- Sauerstoff-Gemisches realisiert zusammen mit einer Expansionsdüse die hohe Geschwindigkeit des Gasstrahls. Der Spritzwerkstoff wird axial in die Brennkammer oder radial im Bereich der Expansionsdüse zugeführt, wodurch die Spritzpartikel auf hohe Geschwindigkeiten beschleunigt werden, um dichte Spritzschichten mit hervorragenden Hafteigenschaften auf dem Grundkorpus zu erzeugen. In particular, the basic body of the bearing ring is coated by means of flame spraying. In the technology, a distinction is made between wire flame spraying and powder flame spraying. When wire flame spraying a wire-shaped spray material is melted by a fuel gas-oxygen flame, compressed air sprayed the melted spray material, in particular the electrically insulating plastic and flings on the substrate provided as the basic body. In contrast, powder flame spraying is based on the same principle of operation as the wire flame spraying zen, with the difference that the coating material, in particular the electrically insulating plastic is not wire-shaped but powder-shaped. The basic body of the bearing ring is preferably coated by means of high-speed spraying (HVOF), in particular using a powder as the spray material. In high velocity flame spraying, continuous high pressure fuel combustion occurs within a water or air cooled combustor. The pressure generated in the combustion chamber of a burning fuel-oxygen mixture realized together with an expansion nozzle, the high velocity of the gas jet. The spray material is fed axially into the combustion chamber or radially in the region of the expansion nozzle, as a result of which the spray particles are accelerated to high speeds in order to produce dense spray coatings with excellent adhesive properties on the base body.
Vorzugsweise ist mit Ausnahme von den Laufflächen für die Wälzkörper an der gesamten Oberfläche des Grundkorpus des Lagerrings die elektrisch isolierende Beschichtung ausgebildet. Bevorzugt ist die elektrisch isolierende Beschichtung auf einer Außenseite des Grundkorpus, auf zwei gegenüberliegenden Seitenflächen des Grundkorpus, auf einer jeweiligen zwischen der Außenseite und jeder Seitenfläche ausgebildeten Verrundung des Grundkorpus und auf einer jeweiligen von jeder Seitenfläche zu einer Innenseite des Grundkorpus verlaufenden Fase des Grundkorpus aufgebracht. Ferner bevorzugt sind beide Lagerringe eines Wälzlagers zumindest teilweise oder vollständig mit der elektrisch isolierenden Beschichtung beschichtet. Mithin ist es auch denkbar den Innenring des Wälzlagers zu beschichten. Preferably, with the exception of the running surfaces for the rolling elements on the entire surface of the base body of the bearing ring, the electrically insulating coating is formed. Preferably, the electrically insulating coating is applied to an outside of the base body, on two opposite side surfaces of the base body, on a respective fillet of the base body formed between the outside and each side face, and on a respective chamfer of the base body extending from each side face to an inside of the base body. Further preferably, both bearing rings of a roller bearing are at least partially or completely coated with the electrically insulating coating. Consequently, it is also conceivable to coat the inner ring of the rolling bearing.
Nach einem erfindungsgemäßen Verfahren zum Aufbringen einer elektrisch isolierenden Beschichtung zumindest auf einem Teil des Grundkorpus des Lagerrings wird das thermische Spritzen, insbesondere das Flammspritzen zum Aufschmelzen und Beför- dem des elektrisch isolierenden Kunststoffs auf den Grundkorpus verwendet. Üblicherweise werden Kunststoffe durch Spritzgießen verarbeitet. Jedoch wäre für die Erzeugung einer elektrisch isolierenden Beschichtung durch Spritzgießen für jede Bauform und jede Schichtdicke eine Spritzgussform notwendig. Vorzugsweise wird die elektrisch isolierende Beschichtung zum Verfallen zumindest oberflächlicher Poren mit einem Harz oder einem Polymer versiegelt. According to a method according to the invention for applying an electrically insulating coating at least on a part of the main body of the bearing ring, the thermal spraying, in particular the flame spraying for melting and Beför- the electrically insulating plastic is used on the base body. Usually, plastics are processed by injection molding. However, for the production of an electrically insulating coating by injection molding, an injection mold would be required for each design and layer thickness. Preferably, the electrically insulating coating is sealed with at least superficial pores with a resin or a polymer.
Bevorzugt wird die elektrisch isolierende Beschichtung mechanisch bearbeitet. Insbe- sondere wird die elektrisch isolierende Beschichtung durch Schleifen oder Polieren mechanisch bearbeitet, um vorzugsweise die Schichtdicke der elektrisch isolierenden Beschichtung einzustellen. Preferably, the electrically insulating coating is mechanically processed. In particular, the electrically insulating coating is mechanically processed by grinding or polishing in order to preferably adjust the layer thickness of the electrically insulating coating.
Weitere die Erfindung verbessernde Maßnahmen werden nachstehend gemeinsam mit der Beschreibung zwei bevorzugter Ausführungsbeispiele der Erfindung anhand der beiden Figuren näher dargestellt. Es zeigen Further measures improving the invention will be described in more detail below together with the description of two preferred embodiments of the invention with reference to the two figures. Show it
Figur 1 eine schematische Schnittdarstellung eines erfindungsgemäßen Lagerrings mit einer elektrisch isolierenden Beschichtung, und Figure 1 is a schematic sectional view of a bearing ring according to the invention with an electrically insulating coating, and
Figur 2 eine vereinfachte schematische Schnittdarstellung eines Grundkorpus mit einer erfindungsgemäßen elektrisch isolierenden Beschichtung. Figure 2 is a simplified schematic sectional view of a base body with an electrically insulating coating according to the invention.
Gemäß Figur 1 weist ein erfindungsgemäßer Lagerring für eine - hier nicht dargestell- te - elektrische Maschine einen Grundkorpus 1 auf, an dem eine elektrisch isolierende Beschichtung 2 aus einem thermisch gespritzten Kunststoff ausgebildet ist. Mithin wird der Kunststoff insbesondere durch Flammspritzen direkt auf den Grundkorpus 1 gespritzt, um die elektrisch isolierende Beschichtung 2 zu erzeugen. Die elektrisch isolierende Beschichtung 2 ist auf einer Außenseite 3 des Grundkorpus 1 , auf zwei gegen- überliegenden Seitenflächen 4a, 4b des Grundkorpus 1 , auf einer jeweiligen zwischen der Außenseite 3 und jeder Seitenfläche 4a, 4b ausgebildeten Verrundung 5a, 5b des Grundkorpus 1 und auf einer jeweiligen von jeder Seitenfläche 4a, 4b zu einer Innenseite 6 des Grundkorpus 1 verlaufenden Fase 7a, 7b des Grundkorpus 1 aufgebracht. Nach Figur 2 weist ein erfindungsgemäßer Grundkorpus 1 eine elektrisch isolierende Beschichtung 2 aus einem thermisch gespritzten Kunststoff auf, wobei die elektrisch isolierende Beschichtung 2 zur Verbesserung der mechanischen Eigenschaften Verstärkungsfasern und/oder Verstärkungspartikel 8 umfasst. Zur Einstellung einer gleichmäßigen Schichtdicke der elektrisch isolierenden Beschichtung 2 wurde die elektrisch isolierende Beschichtung 2 mechanisch bearbeitet. Ferner wurde die elektrisch isolierende Beschichtung 2 zum Verfüllen - hier nicht dargestellter - Poren versiegelt. According to FIG. 1, an inventive bearing ring for an electric machine (not shown here) has a base body 1, on which an electrically insulating coating 2 made of a thermally sprayed plastic is formed. Consequently, the plastic is injected in particular by flame spraying directly onto the base body 1 in order to produce the electrically insulating coating 2. The electrically insulating coating 2 is on an outer side 3 of the base body 1, on two opposite side surfaces 4a, 4b of the main body 1, on a respective between the outer side 3 and each side surface 4a, 4b formed rounding 5a, 5b of the base body 1 and on a respective chamfer 7a, 7b of the base body 1 extending from each side surface 4a, 4b to an inner side 6 of the base body 1. According to FIG. 2, a basic body 1 according to the invention has an electrically insulating coating 2 of a thermally sprayed plastic, the electrically insulating coating 2 comprising reinforcing fibers and / or reinforcing particles 8 for improving the mechanical properties. To set a uniform layer thickness of the electrically insulating coating 2, the electrically insulating coating 2 machined. Furthermore, the electrically insulating coating 2 was sealed for filling - not shown here - pores.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
1 Grundkorpus 1 basic body
2 elektrisch isolierende Beschichtung 2 electrically insulating coating
3 Außenseite  3 outside
4a, 4b Seitenfläche  4a, 4b side surface
5a, 5b Verrundung  5a, 5b rounding
6 Innenseite  6 inside
7a, 7b Fase 7a, 7b bevel
8 Verstärkungsfasern und/oder Verstärkungspartikel  8 reinforcing fibers and / or reinforcing particles

Claims

Patentansprüche claims
1 . Lagerring für eine elektrische Maschine, umfassend eine zumindest teilweise an einem Grundkorpus (1 ) des Lagerrings ausgebildete elektrisch isolierende Beschichtung (2), 1 . Bearing ring for an electrical machine, comprising an electrically insulating coating (2) formed at least partially on a base body (1) of the bearing ring,
dadurch gekennzeichnet, dass die elektrisch isolierende Beschichtung (2) aus einem thermisch gespritzten Kunststoff ausgebildet ist. characterized in that the electrically insulating coating (2) is formed of a thermally sprayed plastic.
2. Lagerring nach Anspruch 1 , 2. bearing ring according to claim 1,
dadurch gekennzeichnet, dass die elektrisch isolierende Beschichtung (2) auf einer Außenseite (3) des Grundkorpus (1 ), auf zwei gegenüberliegenden Seitenflächen (4a, 4b) des Grundkorpus (1 ), auf einer jeweiligen zwischen der Außenseite (3) und jeder Seitenfläche (4a, 4b) ausgebildeten Verrundung (5a, 5b) des Grundkorpus (1 ) und auf einer jeweiligen von jeder Seitenfläche (4a, 4b) zu einer Innenseite (6) des Grundkorpus (1 ) verlaufenden Fase (7a, 7b) des Grundkorpus (1 ) aufgebracht ist. characterized in that the electrically insulating coating (2) is formed on an outer side (3) of the base body (1) on two opposite side surfaces (4a, 4b) of the main body (1), on a respective one between the outer side (3) and each side surface (4a, 4b) formed rounding (5a, 5b) of the base body (1) and on a respective of each side surface (4a, 4b) to an inner side (6) of the base body (1) extending chamfer (7a, 7b) of the base body ( 1) is applied.
3. Lagerring nach einem der vorhergehenden Ansprüche, 3. bearing ring according to one of the preceding claims,
dadurch gekennzeichnet, dass die elektrisch isolierende Beschichtung (2) zur Ver- besserung der mechanischen Eigenschaften Verstärkungsfasern und/oder Verstärkungspartikel (8) umfasst. characterized in that the electrically insulating coating (2) to improve the mechanical properties of reinforcing fibers and / or reinforcing particles (8).
4. Lagerring nach einem der vorhergehenden Ansprüche, 4. bearing ring according to one of the preceding claims,
dadurch gekennzeichnet, dass die elektrisch isolierende Beschichtung (2) eine Schichtdicke von 0,05 bis 1 mm aufweist. characterized in that the electrically insulating coating (2) has a layer thickness of 0.05 to 1 mm.
5. Verfahren zum Aufbringen einer elektrisch isolierenden Beschichtung (2) zumindest teilweise auf einem Grundkorpus (1 ) eines Lagerrings, wobei die elektrisch isolierende Beschichtung (2) durch thermisches Spritzen eines Kunststoffs ausgebil- det wird. 5. A method for applying an electrically insulating coating (2) at least partially on a base body (1) of a bearing ring, wherein the electrically insulating coating (2) is formed by thermal spraying of a plastic.
6. Verfahren nach Anspruch 5, 6. The method according to claim 5,
dadurch gekennzeichnet, dass der Grundkorpus (1 ) des Lagerrings mittels Flammspritzen beschichtet wird. characterized in that the basic body (1) of the bearing ring is coated by means of flame spraying.
7. Verfahren nach Anspruch 5, 7. The method according to claim 5,
dadurch gekennzeichnet, dass die elektrisch isolierende Beschichtung (2) zum Verfielen zumindest oberflächlicher Poren mit einem Harz oder Polymer versiegelt wird. characterized in that the electrically insulating coating (2) is sealed with a resin or polymer to minimize at least superficial pores.
8. Verfahren nach Anspruch 5, 8. The method according to claim 5,
dadurch gekennzeichnet, dass die elektrisch isolierende Beschichtung (2) mechanisch bearbeitet wird. characterized in that the electrically insulating coating (2) is mechanically processed.
9. Verwendung des thermischen Spritzens zur Herstellung einer elektrisch isolierenden Beschichtung (2) aus einem Kunststoff auf einem Grundkorpus (1 ) eines La- gerrings. 9. Use of thermal spraying for producing an electrically insulating coating (2) made of a plastic on a base body (1) of a bearing ring.
PCT/DE2017/100745 2016-09-13 2017-09-06 Bearing ring with an electrically insulating coating and method for producing an electrically insulating coating WO2018050159A1 (en)

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